Gallardo Ex Rel. Gallardo v. United States , 752 F.3d 865 ( 2014 )


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  •                                                                       FILED
    United States Court of Appeals
    Tenth Circuit
    May 19, 2014
    PUBLISH                Elisabeth A. Shumaker
    Clerk of Court
    UNITED STATES COURT OF APPEALS
    TENTH CIRCUIT
    MARIA GALLARDO and D.R.G., a
    minor child by and through her natural
    mother and next best friend, MARIA
    GALLARDO,
    Plaintiffs - Appellants,
    v.                                                     No. 12-1325
    UNITED STATES OF AMERICA,
    Defendant - Appellee.
    APPEAL FROM THE UNITED STATES DISTRICT COURT
    FOR THE DISTRICT OF COLORADO
    (D.C. No. 1:10-cv-00868-PAB-CBS)
    Michael Goodman, PC, Englewood, Colorado, (William G. Fischer, PC, Colorado
    Springs, Colorado, with him on the briefs), for Plaintiffs-Appellants.
    Laurie K. Dean, Special Assistant United States Attorney, (John F. Walsh, United
    States Attorney, with her on the brief), Denver, Colorado, for Plaintiff-Appellee.
    Before BRISCOE, Chief Judge, HOLLOWAY * and HOLMES, Circuit Judges.
    *
    The late Honorable William J. Holloway, Jr., United States Senior Circuit
    Judge, participated as a panel member when this case was heard, but passed away
    before final disposition. “The practice of this court permits the remaining two
    panel judges, if in agreement, to act as a quorum in resolving the appeal.” United
    (continued...)
    BRISCOE, Chief Judge.
    Plaintiffs Maria Gallardo and her minor child, DRG, who was born with
    cerebral palsy, filed this action against the United States of America pursuant to
    the Federal Tort Claims Act. Plaintiffs claimed that the performance of Ms.
    Gallardo’s attending obstetrician, Dr. Jeffery McCutcheon, fell below the
    applicable standard of care during the labor and delivery of DRG. After
    conducting a bench trial, the district court found in favor of the United States.
    Plaintiffs now appeal. Exercising jurisdiction pursuant to 28 U.S.C. § 1291, we
    affirm the judgment of the district court.
    I
    Factual background
    On the afternoon of February 11, 2007, Ms. Gallardo went to Memorial
    Hospital in Colorado Springs, Colorado, complaining of reduced fetal movement.
    At approximately 3:10 p.m., a triage nurse placed an electronic fetal monitor
    (EFM) on Ms. Gallardo. The EFM strip (i.e., the paper printout produced by the
    EFM) showed some reactivity, but also showed a deceleration in the fetal heart
    *
    (...continued)
    States v. Wiles, 
    106 F.3d 1516
    , 1516 n.* (10th Cir. 1997); see also 28 U.S.C. §
    46(d) (noting circuit court may adopt procedure permitting disposition of an
    appeal where remaining quorum of panel agrees on the disposition). The
    remaining panel members have acted as a quorum with respect to this opinion.
    2
    rate. Based upon these circumstances, and the fact that Ms. Gallardo was
    experiencing some early contractions, Ms. Gallardo’s attending physician, Dr.
    McCutcheon, admitted her to the hospital. Dr. McCutcheon, a board-certified
    obstetrician and gynecologist, was employed as the clinical director of the
    Women’s Care Center at Peak Vista Community Health Center, a federally-
    operated facility that provided a variety of health services to underprivileged
    patients in the Colorado Springs area.
    At approximately 5:00 p.m., Dr. McCutcheon ordered the nursing staff to
    administer Pitocin to Ms. Gallardo via an intravenous line (IV). Pitocin, a
    synthetic form of oxytocin, is used to induce or strengthen contractions. At
    approximately 5:30 p.m., Dr. McCutcheon ordered the amount of Pitocin to be
    increased slightly. Shortly before 6:00 p.m., the EFM strip showed a late
    deceleration. A late deceleration begins after the start of a contraction, reaches
    its nadir after the contraction peaks, and returns to baseline after the contraction
    has completed. Late decelerations are a sign of fetal hypoxia (lack of oxygen) if
    heart rate variability is also decreased. Because of the late deceleration, Dr.
    McCutcheon ordered the Pitocin to be turned off. To address any possible fetal
    hypoxia, the staff also changed Ms. Gallardo’s position and administered oxygen
    and an IV bolus to Ms. Gallardo. By 6:30 p.m., the EFM strip appeared normal
    again. Consequently, Dr. McCutcheon ordered the Pitocin to be turned back on.
    At approximately 7:40 p.m., the EFM strip began to exhibit
    3
    hyperstimulation, which is more than five contractions in a ten minute period of
    time. At approximately 8:00 p.m., Dr. McCutcheon ruptured Ms. Gallardo’s
    membranes, placed a fetal scalp electrode on the baby’s head to measure its heart
    rate and inserted a pressure catheter inside Ms. Gallardo’s uterus in order to
    measure the contractions. Shortly thereafter, the staff began to see mild variable
    decelerations in the baby’s heart rate. Variable decelerations are of short duration
    and are a sign of possible umbilical cord compression. Dr. McCutcheon
    responded by ordering an amniofusion, which involves injecting fluid up near the
    baby in the amniotic cavity in an attempt to alleviate cord compression. The
    amniofusion continued for the remainder of the labor and delivery.
    At approximately 8:20 p.m., the nursing staff stopped the Pitocin because
    the EFM strip was exhibiting tachysystole. Tachysystole, also known as
    hyperstimulation, means an excessive number of contractions, generally defined
    as six or more contractions in a ten minute period. The baby responded positively
    to the Pitocin being turned off. However, tachysystole was consistently present
    throughout the remainder of the labor and delivery.
    By 11:00 p.m., Ms. Gallardo was dilated four centimeters and at a -2
    station (meaning relatively high in the pelvis). At approximately 11:10 p.m., the
    staff recognized that the EFM strip was exhibiting a prolonged variable
    deceleration. A prolonged deceleration is a deceleration lasting between two and
    ten minutes and is a sign of possible fetal hypoxia. Another prolonged
    4
    deceleration occurred shortly after 11:30 p.m. At that time, Ms. Gallardo’s cervix
    was dilated five centimeters and the baby remained at a negative station.
    At approximately 12:35 a.m., another prolonged deceleration occurred. A
    member of the nursing staff allegedly examined Ms. Gallardo 1 and determined
    that she was completely dilated, but that the baby was still at a negative station.
    At approximately 12:42 a.m., Ms. Gallardo, pursuant to Dr. McCutcheon’s
    instructions, began pushing. After one push, the EFM strip showed a prolonged
    deceleration. As a result of the prolonged deceleration, Dr. McCutcheon had Ms.
    Gallardo stop pushing for a few contractions.
    Dr. McCutcheon continued to monitor the strip and interpreted it as
    showing that the baby’s heart rate was recovering and maintaining good
    variability. In light of that, and because he believed that delivery would occur
    relatively quickly, Dr. McCutcheon instructed Ms. Gallardo to begin pushing
    again. At approximately 1:10 a.m., the EFM strip was showing persistent late
    decelerations, tachycardia (a baseline fetal heart rate exceeding the top normal
    rate of 160 beats per minute), and diminished variability. Variability is the most
    sensitive indicator of whether a baby is suffering from hypoxia. Minimal or
    diminished variability means fluctuation of less than five beats per minute.
    Minimal or diminished variability is considered abnormal; in contrast, moderate
    variability, which is six to twenty-five beats per minute, is considered reassuring.
    1
    As we shall discuss below, this is a disputed fact.
    5
    The nursing staff responded to these concerning indications by giving Ms.
    Gallardo oxygen and an IV bolus and notifying Dr. McCutcheon. But the nursing
    staff also instructed Ms. Gallardo to keep pushing.
    At approximately 1:30 a.m., the EFM strip continued to show persistent late
    decelerations. The nursing staff again notified Dr. McCutcheon and, from that
    point forward, he remained at Ms. Gallardo’s bedside. 2 Dr. McCutcheon
    instructed Ms. Gallardo to stop pushing. The EFM strip, however, continued to
    indicate that the baby was experiencing tachycardia. And the internal pressure
    catheter indicated that the baseline hypertonus, i.e., the uterine tone or pressure,
    was elevated. In such conditions, the baby does not receive enough rest between
    contractions and is at risk of developing hypoxia.
    Dr. McCutcheon instructed Ms. Gallardo to begin pushing again. The EFM
    strip indicated another prolonged deceleration, minimal variability, and
    tachycardia. Per Dr. McCutcheon’s instructions, however, Ms. Gallardo
    continued to push and eventually delivered DRG at 2:22 a.m. DRG’s cord gases
    at birth were severely acidotic with a base deficit of approximately 18. 3 DRG was
    2
    According to Dr. McCutcheon, he visited Ms. Gallardo’s room twice
    during the first stage of labor, App. at 419, several times during the pushing
    phase, 
    id. at 432,
    and ultimately remained in Gallardo’s room from approximately
    1:30 a.m. until delivery, 
    id. at 450.
          3
    According to the evidence in the record, the threshold of metabolic
    acidosis that is associated with fetal injury is a base deficit of greater than or
    equal to 12.
    6
    initially diagnosed with hypoxic-eschemic encephalopathy. Ultimately, however,
    DRG was diagnosed with cerebral palsy.
    Procedural background
    On April 19, 2010, after exhausting the administrative remedies offered by
    the United States Department of Health and Human Services, Ms. Gallardo and
    DRG initiated this action by filing suit against the United States pursuant to the
    Federal Tort Claims Act (FTCA). 4 The complaint alleged, in pertinent part, that
    Dr. McCutcheon’s performance “fell below the standard of care” in several
    respects, Complaint at 7, including (a) “not properly interpreting the fetal
    monitoring strip,” 
    id., (b) “continuing
    to push with evidence of acidosis as
    evidenced by prolonged decelerations, minimal to absent variability, persistent
    late decelerations, and tachycardia, in the presence of tachysystole and uterine
    hypertonus,” 
    id. at 8,
    (c) “not initiating a cesarean section . . . at 0050 on
    February 12, 2007, if not before,” 
    id., and (d)
    “not properly interpreting the
    severity of the pattern demonstrated by the [fetal heart rate monitor],” 
    id. Ms. Gallardo
    and DRG sought judgment against the United States “for the sum and
    amount of $60,000,000.00 plus [their] cost [sic] in this action, [and] pre and post
    judgment interests [sic] in accordance with the law.” 
    Id. at 12.
    The case was tried to the district court beginning on April 9, 2012, and
    4
    The complaint also asserted claims against the City of Colorado Springs.
    Those claims are not at issue in this appeal.
    7
    concluding on April 24, 2012. On June 28, 2012, the district court issued a
    written order finding in favor of the United States on plaintiffs’ claims under the
    FTCA. Final judgment was entered in the case on June 29, 2012. Plaintiffs filed
    a timely notice of appeal.
    II
    On appeal, plaintiffs assert seven separate challenges to the district court’s
    order finding in favor of the United States. As outlined in greater detail below,
    we conclude that all seven of these challenges lack merit. And, for that reason,
    we affirm the district court’s judgment in favor of the United States.
    Standard of review
    When a party appeals from a bench trial, we review the district court’s
    factual findings for clear error and its legal conclusions de novo. Roberts v.
    Printup, 
    595 F.3d 1181
    , 1186 (10th Cir. 2010). We review “mixed questions of
    law and fact . . . ‘under the clearly erroneous or de novo standard, depending on
    whether the mixed question involves primarily a factual inquiry or the
    consideration of legal principles.’” 
    Id. (quoting Estate
    of Holl v. Comm’r, 
    54 F.3d 648
    , 650 (10th Cir. 1995)).
    Substantive law applicable to plaintiffs’ medical malpractice claims
    In order to establish governmental liability under the FTCA, a plaintiff
    must establish that the injury at issue was “caused by the negligent or wrongful
    act or omission of any employee of the Government . . . under circumstances
    8
    where the United States, if a private person, would be liable to the claimant in
    accordance with the law of the place where the act or omission occurred.”
    Harvey v. United States, 
    685 F.3d 939
    , 947 (10th Cir. 2012) (internal quotation
    marks omitted). Thus, in this case, “the FTCA mandates application of” Colorado
    state law “to resolve questions of substantive liability.” 
    Id. (internal quotation
    marks and brackets omitted).
    Colorado law treats “medical malpractice action[s] [a]s a particular type of
    negligence action.” Day v. Johnson, 
    255 P.3d 1064
    , 1068 (Colo. 2011). “Like
    other negligence actions, the plaintiff must show a legal duty of care on the
    defendant’s part, breach of that duty, injury to the plaintiff, and that the
    defendant’s breach caused the plaintiff’s injury.” 
    Id. at 1068-69.
    “A physician’s duty arises out of a[n] [express or implied] contractual
    relationship when a physician undertakes to treat or otherwise provide medical
    care to another.” 
    Id. at 1069.
    “[I]n the absence of a special contract,” Colorado
    “law implies that a physician employed to treat a patient contracts with his patient
    that: (1) he possesses that reasonable degree of learning and skill which is
    ordinarily possessed by others of the profession; (2) he will use reasonable and
    ordinary care and diligence in the exercise of his skill and the application of his
    knowledge to accomplish the purpose for which he is employed; and (3) he will
    use his best judgment in the application of his skill in deciding upon the nature of
    the injury and the best mode of treatment.” 
    Id. “Further, if
    a physician possesses
    9
    ordinary skills and exercises ordinary care in applying it, he is not responsible for
    a mistake of judgment.” 
    Id. Further, a
    physician “possessing ordinary skill and
    exercising ordinary care in applying it . . . does not guarantee a successful
    outcome.” 
    Id. “Thus, a
    medical malpractice claim requires more than proving a
    poor outcome; a breach of the applicable standard of care is required.” 
    Id. “To establish
    a breach of the duty of care in a medical malpractice action,
    the plaintiff must show that the defendant failed to conform to the standard of
    care ordinarily possessed and exercised by members of the same school of
    medicine practiced by the defendant.” 
    Id. “That standard
    of care is measured by
    whether a reasonably careful physician of the same school of medicine as the
    defendant would have acted in the same manner as did the defendant in treating
    and caring for the patient.” 
    Id. “Thus, the
    standard of care for medical
    malpractice is an objective one.” 
    Id. “Unless the
    subject matter of a medical malpractice action lies within the
    ambit of common knowledge or experience of ordinary persons, the plaintiff must
    establish the controlling standard of care, as well as the defendant’s failure to
    adhere to that standard, by expert opinion testimony.” Melville v. Southward,
    
    791 P.2d 383
    , 387 (Colo. 1990). “The reason for the requirement of expert
    opinion testimony in most medical malpractice cases is obvious: matters relating
    to medical diagnosis and treatment ordinarily involve a level of technical
    knowledge and skill beyond the realm of lay knowledge and experience.” 
    Id. 10 “Without
    expert opinion testimony in such cases, the trier of fact would be left
    with no standard at all against which to evaluate the defendant’s conduct.” 
    Id. The expert
    testimony in this case
    At trial, plaintiffs relied on testimony from two expert witnesses: Dr.
    Michael Hall and Dr. Michael Ross. The government countered that evidence
    with two witnesses of its own: Dr. McCutcheon and expert witness Dr. Robert
    Gore. All four of these witnesses were board-certified obstetricians and
    gynecologists. Three of the four (Drs. Hall, McCutcheon and Gore) were in
    private practice in the State of Colorado. The fourth (Dr. Ross) had worked
    primarily as an academician (and teaching clinician) in the State of California.
    Both Dr. Hall and Dr. Ross agreed that McCutcheon failed to properly
    interpret the EFM strip and erred by not performing a cesarean section. The
    precise details of their opinions differed, however. In Dr. Hall’s opinion, Dr.
    McCutcheon could, and probably should, have performed a cesarean section at
    approximately 11:00 p.m. or shortly thereafter because, according to Hall’s
    interpretation of the EFM strip, the baby was experiencing ischemic episodes
    during which it was not receiving enough oxygen. App. at 74-75, 93. Dr. Hall
    also opined that Dr. McCutcheon allowed Ms. Gallardo to engage in too much
    pushing, particularly in the time period after 12:50 a.m., and that a cesarean
    section should certainly have been performed at that time because, according to
    the EFM strip, the baby was exhibiting bradycardia (low heart rate). 
    Id. at 85,
    93-
    11
    94, 161, 213. Dr. Hall explained that, at that point, the risk to the baby from not
    performing a cesarean section was much greater than the risk to Ms. Gallardo
    from performing a cesarean section. 
    Id. at 248-49.
    Lastly, Dr. Hall was of the
    belief that, because the excessive contractions did not cease after the Pitocin was
    stopped, there must have been an abruption in the placenta i.e., a serious
    condition in which the placenta partially or completely separates from the lining
    of the uterus. 
    Id. at 78-79,
    180. And that condition, he opined, necessitated a
    cesarean section.
    Dr. Ross opined that the baby appeared to be healthy and doing fine up to
    approximately 12:35 a.m. 
    Id. at 275.
    More specifically, Dr. Ross opined that it
    was not until the second stage of labor, i.e., the pushing phase, that the EFM strip
    began to indicate the development of severe acidosis on the part of the baby. 
    Id. at 276.
    Dr. Ross agreed with Dr. Hall that it was unreasonable for Dr.
    McCutcheon to have Ms. Gallardo push with almost every contraction because it
    left the baby with little or no time to recover and, consequently, the baby rapidly
    accumulated acidosis. 
    Id. at 281,
    309. That acidosis, Dr. Ross opined, began
    building at approximately 12:30 a.m. (with the first push) and ultimately reached
    an injurious level, i.e., likely resulted in brain injury and ultimately cerebral
    palsy, at approximately 1:40 a.m. 
    Id. at 307,
    330. Thus, Dr. Ross testified, a
    cesarean section, or some other measure, should have been performed prior to that
    time. 
    Id. at 307,
    322. In sum, Dr. Ross opined that Dr. McCutcheon did not
    12
    appropriately manage the baby, based upon the EFM strip, and thus breached the
    standard of care. 
    Id. at 284.
    Drs. McCutcheon and Gore, on the other hand, both testified that Dr.
    McCutcheon’s actions fell within the standard of care. Dr. McCutcheon testified
    that when he admitted Ms. Gallardo to the hospital, there was nothing he was
    aware of that would have indicated a high-risk pregnancy. 
    Id. at 415.
    In fact, Dr.
    McCutcheon testified, he believed she was at a decreased risk of having delayed
    labor or needing a cesarean section because she had previously delivered two
    babies vaginally and had what is referred to as a “clinically proven pelvis.” 
    Id. at 417.
    Dr. McCutcheon admitted, however, that the first stage of Ms. Gallardo’s
    labor did not “go textbook smooth” and in fact “was a stressful situation.” 
    Id. at 432.
    Dr. McCutcheon also admitted that throughout Ms. Gallardo’s labor “[i]t
    was an idea we might have to do” a cesarean section. 
    Id. at 435.
    According to
    Dr. McCutcheon, he most seriously considered performing a cesarean section
    when Ms. Gallardo was at 4 centimeters (approximately 11:00 p.m.), and later on
    during the latter phases of the second stage of labor (approximately 2:00 a.m.).
    
    Id. at 436,
    463. However, Dr. McCutcheon testified, in his opinion the EFM strip
    never reached a Category III because at all times he observed what he believed to
    be at least some minimal variability. 
    Id. at 466.
    Dr. McCutcheon also testified
    that, based upon Ms. Gallardo’s previous delivery history and his assessment of
    the baby as being “clinically small,” he believed that Ms. Gallardo would rapidly
    13
    deliver once she started pushing. 
    Id. at 449.
    Lastly, Dr. McCutcheon testified
    that he chose not to perform a cesarean section during the latter phases of the
    second stage of labor (after Ms. Gallardo had been pushing for a long period of
    time) because it would have taken a certain amount of time to move Ms. Gallardo
    from her delivery room to an operating room and to prepare the operating room
    for delivery, and because there is an increased risk of injury (to both the baby and
    the mother) when doing a cesarean section on a woman who is completely dilated.
    
    Id. at 467.
    Dr. Gore testified that, in his opinion, Dr. McCutcheon “acted in a
    reasonable and careful manner as a similar physician in similar circumstances,”
    and was not “substandard in his care and treatment for Ms. Gallardo.” 
    Id. at 541.
    Dr. Gore proceeded to explain that, in his opinion, “electronic fetal monitoring
    has a [sic] extremely high false positive rate, an extremely low positive predictive
    value for certainly predicting cerebral palsy yet alone hypoxic-ischemic
    encephalopathy yet alone the severity of acidosis.” 
    Id. at 545.
    Dr. Gore agreed
    with Dr. McCutcheon that Ms. Gallardo was “relatively low risk” because of her
    two prior vaginal deliveries, and that it was reasonable for Dr. McCutcheon to
    induce Ms. Gallardo and plan for a vaginal delivery after induction. 
    Id. at 551-
    52. Dr. Gore testified that there would have been risks associated with
    performing a cesarean section, with those risks being slightly increased at the end
    of the second stage of labor (when the baby was at a plus station). 
    Id. at 556-57.
    14
    Dr. Gore also explained that, in his opinion, managing the second stage of labor is
    one of the hardest jobs for an obstetrician because it requires constant evaluation
    of the risk to the baby versus the risk to the mother. 
    Id. at 557.
    In managing
    these risks, Dr. Gore testified, obstetricians “are constantly evaluating the [fetal
    monitor] tracing and the mother’s previous clinical history, her previous delivery
    history, her body [weight],” and other factors. 
    Id. Dr. Gore
    testified that all
    babies experience stress during labor and delivery, including a decrease in blood
    flow from the uterine contractions, and that the vast majority of babies tolerate
    that stress. 
    Id. at 560.
    In particular, Dr. Gore testified that a tremendous number
    of babies with metabolic acidosis (developed during the delivery process) have no
    resulting disease or condition. 
    Id. at 584.
    Dr. Gore also testified that he had
    never, in the course of delivering approximately 3,000 babies, performed a
    cesarean section just because of tachysystole (i.e., too many frequent
    contractions). 
    Id. at 551.
    In sum, Dr. Gore opined that, in light of all the
    information Dr. McCutcheon had available to him during the labor and delivery of
    DRG, his prospective management and care was within the standard of care. 
    Id. at 562.
    The district court’s decision
    After considering all of this evidence, the district court “conclude[d] that
    Dr. McCutcheon, who interpreted the EFM strip in this case as presenting a
    ‘persistently non-reassuring FHR tracing,’ Ex. B-37, ACOG No. 70 at 6, used
    15
    reasonable and ordinary care in responding to such tracing and in proceeding with
    a vaginal delivery.” Order at 25 (Dist. Ct. Docket No. 192). In reaching this
    conclusion, the district court relied heavily on guidelines and materials issued by
    the American College of Obstetricians and Gynecologists (ACOG) at or before
    the time of DRG’s birth. 5 To begin with, the district court noted that ACOG
    Bulletin No. 70 (ACOG No. 70) stated “that persistently non-reassuring EFM
    strips, such as this one, provide only a limited amount of clinical guidance to an
    obstetrician,” 
    id. at 26,
    and “informs obstetricians to take certain non-operative
    interventions in the face of a persistently non-reassuring strip,” 
    id. at 27.
    The
    district court also noted that “ACOG No. 70 implies that” rapid dilation and
    descent of the baby “might provide a more concrete explanation for . . .
    decelerations than the weak statistical connection between certain non-reassuring
    patterns and neurological injury.” 
    Id. Lastly, the
    district court noted that “ACOG
    No. 70 specifically cautions against concluding that EFM interpretation is
    predictive and reliable,” 
    id. at 28,
    and that “the ACOG Green Book informed
    obstetricians in 2003 that the ‘incidence of cerebral palsy has remained
    essentially unchanged despite the common use of intrapartum fetal heart rate
    monitoring in both high- and low-risk patients,’” 
    id. at 28-29.
    5
    There was general agreement among the expert witnesses in this case that
    the ACOG recommendations and technical bulletins are a valid source of data for
    a practicing obstetrician/gynecologist.
    16
    Although the district court acknowledged the differing opinions offered by
    Dr. Hall and Dr. Ross, it did not give those opinions controlling weight in
    determining the standard of care applicable to Dr. McCutcheon’s conduct. For
    example, the district court acknowledged Dr. Hall’s testimony “that ‘minimal’
    variability is an indicator of fetal hypoxia and resulting acidosis,” 
    id. at 26,
    but
    noted that the ACOG publications were much more equivocal on this issue, and
    further noted that “as recently as January 10, 2012, a clinical information
    publication distributed to physicians stated that ‘less than moderate variability
    does not reliably mean the fetus is acidotic,’” 
    id. (quoting Ex.
    B-41, Bruce K.
    Young, M.D., “Intrapartum fetal heart rate assessment,” UpToDate, at 4 (last
    updated Jan. 10, 2012)). Likewise, although the district court noted that Dr. Ross
    “indicated that no baseline heart rate could be determined during the pushing
    phase” of labor in this case, it noted that Dr. Ross’s “conclusion was based on a
    close reading of the definition of ‘baseline variability,’ a term defined in ACOG
    No. 106, which was published two years after D.R.G.’s birth.” 
    Id. at 29.
    And,
    the district court noted, although “Dr. Ross recounted advice he had been given
    about the need to slow labor down in the face of non-reassuring strips of this sort,
    . . . he did not provide any basis for the Court to conclude that it is generally
    accepted and therefore would define the applicable standard of care in this case.”
    
    Id. Ultimately, the
    district court concluded that “[t]he standard of care in the face
    of persistently non-reassuring EFM strips in February 2007 could include [the]
    17
    wide range of approaches” advocated by the various experts in this case. 
    Id. at 30.
    Finally, the district court noted that “Dr. McCutcheon identified at least
    minimal variability through the labor, an interpretation that the Court [could not]
    conclude was unreasonable.” 
    Id. at 26.
    Similarly, the district court “conclude[d]
    that Dr. McCutcheon identified the EFM strip events discussed in ACOG No. 70,
    demonstrating his reasonable degree of learning, and responded to them in a
    fashion that was consistent with the standard of care in his medical specialty.” 
    Id. at 29.
    Plaintiffs’ challenges to the district court’s decision
    1) Did the district court apply the wrong standard of care?
    Plaintiffs first complain that the district court “ignored the standard of care
    established by” their expert witness, Dr. Ross. Aplt. Br. at 20. Indeed, plaintiffs
    assert, the district court “disregarded” that standard of care “based upon an
    erroneous interpretation of the meaning of standard of care in Colorado.” 
    Id. at 20-21.
    In support, plaintiffs note that the district court, in its findings of fact and
    conclusions of law, stated that while “Dr. Ross recounted advice he had been
    given about the need to slow labor down in the face of non-reassuring [EFM]
    strips of this sort, . . . he did not provide any basis for the Court to conclude that
    it is generally accepted and therefore would define the applicable standard of care
    in this case.” Order at 29. “This holding,” plaintiffs argue, indicates that the
    18
    district court “erroneously imposed a burden on Dr. Ross to provide extrinsic
    evidence to support his opinion as to the standard of care.” Aplt. Br. at 21. But,
    they argue, “[n]o Colorado case requires that an expert reference external sources
    to show that his or her opinions are the correct standard of care.” 
    Id. The district
    court also, plaintiffs argue, “applied the wrong standard of care when it required
    Dr. Ross to establish the standard of care was ‘generally accepted.’” 
    Id. at 22.
    Indeed, plaintiffs argue, “[t]he Colorado Supreme Court has specifically rejected
    this requirement because the standard of care cannot be determined simply by
    counting how many physicians follow a particular practice.” 
    Id. (citing State
    Bd.
    of Med. Exam’rs v. McCroskey, 
    880 P.2d 1188
    , 1194 (Colo. 1994)).
    McCroskey, the case cited by plaintiffs, involved an appeal from a
    disciplinary proceeding filed by the State Board of Medical Examiners against a
    physician. The administrative law judge who initially heard the case found that
    the defendant physician “did not violate the standard of care by applying the
    ‘respectable minority’ test,” under which “a deviation from a higher standard of
    care practiced by the majority is excusable when it is shown that a respectable
    minority of physicians approved of the course of action 
    selected.” 880 P.2d at 1194
    . The Colorado Supreme Court, however, expressly overruled the
    respectable minority test. Citing its decision in United Blood Serv. v. Quintana,
    
    827 P.2d 509
    (Colo. 1992), the Colorado Supreme Court explained “that the
    standards of medical practice cannot be determined simply by counting how many
    19
    physicians follow a particular 
    practice.” 880 P.2d at 1194
    . “In other words,” the
    Colorado Supreme Court explained, “ascertaining the objectively reasonable
    standard of care is more than just a factual finding of what all, most, or even a
    ‘respectable minority’ of physicians do, although the actual practice in a
    community is certainly the starting point in any analysis.” 
    Id. at 1194-95.
    That is
    because “[t]he customary or prevailing practice may not be adequate or
    objectively reasonable in light of all the facts and circumstances.” 
    Id. at 1195.
    The district court in this case ruled consistently with, rather than contrary
    to, McCroskey and Quintana. As we have outlined, the district court was
    presented, by way of expert witness testimony and references to various
    publications, with several differing opinions regarding how EFM strips should be
    interpreted and how much of a link there is between EFM values and cerebral
    palsy. More specifically, the evidence presented to the district court was
    conflicting regarding whether there is a link between cerebral palsy and high
    levels of acidosis that occur in some babies during labor and delivery. Dr. Ross
    represented the extreme end of this spectrum in terms of his opinions regarding
    the predictive value of the EFM values in this case and DRG’s cerebral palsy. He
    opined that DRG was probably a “healthy baby that [didn’t] ha[ve] any
    neurological compromise” at the outset of Ms. Gallardo’s labor, App. at 271, and
    that DRG’s neurological injury, which led to her cerebral palsy, occurred during
    the second stage of delivery, between approximately 1:30 and 1:40 a.m. on the
    20
    morning of her birth, once her “base deficit” (a term that relates to accumulated
    acidosis) reached a level of 12, 
    id. at 305-07.
    Based upon these opinions, Dr.
    Ross in turn opined that Dr. McCutcheon breached the standard of care by failing
    to properly manage Ms. Gallardo’s labor. 
    Id. at 344.
    The district court, however, chose not to accept Dr. Ross’s testimony as
    defining the controlling standard of care because it was inconsistent not only with
    the opinions expressed by Drs. McCutcheon and Gore, but more importantly
    because it was inconsistent with the positions taken by ACOG in its publications
    and guidelines. In other words, the district court effectively determined that
    ACOG’s positions, particularly its position that EFM strips have questionable
    predictive value when it comes to cerebral palsy, were adequate or objectively
    reasonable. And, by doing so, the district court did not necessarily impose any
    unwarranted burden on Dr. Ross. Rather, it simply chose to reject Dr. Ross’s
    opinions on this point and, in the end, determined “the generally accepted
    standard of medical practice . . . by evaluati[ng] . . . the expert testimony in light
    of the controlling legal principles.” 
    McCroskey, 880 P.2d at 1195
    .
    2) Did the district court erroneously disregard Dr. Hall’s opinions?
    Plaintiffs next argue that the district court erroneously disregarded the
    opinions of their other expert witness, Dr. Hall. In support, plaintiffs assert that
    the district court “found Dr. Hall had opined that his personal practice would have
    been to perform a c-section at 11:00 pm,” and in turn “erroneously use[d] this
    21
    personal practice as a statement of the standard of care.” Aplt. Br. at 23. In fact,
    plaintiffs argue, “Dr. Hall opined that the standard of care required Dr.
    McCutcheon to change his management and intervene, including potentially
    performing a c-section, based upon the baby’s 10-minute deceleration in response
    to the first push at 12:42 a.m.” 
    Id. “These opinions,”
    plaintiffs argue, “are
    similar to and consistent with Dr. Ross’s.” 
    Id. We reject
    plaintiffs’ arguments. Although plaintiffs’ expert witnesses, Drs.
    Hall and Ross, agreed that Dr. McCutcheon should have taken some preventive
    action, most notably performing a cesarean section, based upon the baby’s ten-
    minute deceleration in response to the first push at 12:42 a.m., they otherwise
    disagreed in a number of important respects. Indeed, the district court highlighted
    those differences in its opinion:
    [A]lthough Dr. Ross and Dr. Hall both believed that Dr.
    McCutcheon should have taken an alternative course, they disagreed
    regarding both the nature and timing of such alternatives based on
    their individual interpretations of the EFM strips. Dr. Hall
    interpreted the prolonged deceleration at 11:00 p.m. as a sign that the
    baby’s condition was worsening and, therefore, would have
    conducted a C-section at that point or, in the absence of
    improvement, within 20 minutes. As of 11:10 p.m, Dr. Hall believed
    the EFM strip was “bizarre.” Dr. Ross, however, when describing
    the strip at 11:15 p.m., testified that he did not believe there was any
    reason for Dr. McCutcheon to take any additional steps.
    Dr. Hall testified that a prolonged deceleration after 11:30 p.m.
    that evening was a sign of increasing hypoxia. Dr. Ross, however,
    did not testify that he had any significant concerns regarding the
    baby’s status at that point in the labor. Dr. Hall was troubled by
    reduced variability around midnight that evening, but Dr. Ross was
    22
    not. Dr. Ross described reduced variability around 12:20 a.m. as a
    sign that the baby was going through quiet and active sleep stages
    which was not a sign of fetal distress.
    Dr. Hall identified both hyperstimulation and hypertonus before
    the commencement of pushing and believed Dr. McCutcheon should
    have done something to address these issues. Dr. Ross, however, did
    not believe that either the hyperstimulation or hypertonus, prior to
    pushing, required any additional interventions. Furthermore, ACOG
    No. 70 does not provide specific advice regarding how or whether an
    obstetrician should address hyperstimulation and hypertonus.
    Dr. Hall believed the baby had been having difficulty long before
    the commencement of pushing at 12:40 a.m. and, therefore,
    concluded that Dr. McCutcheon should not have proceeded with a
    planned vaginal delivery. Dr. Ross did not take issue with Dr.
    McCutcheon’s decision to have Maria Gallardo start pushing
    (although he criticized Dr. McCutcheon’s decision to continue
    pushing in light of prolonged decelerations), interpreting the strip as
    indicating that the baby was tolerating labor well prior to
    commencement of pushing.
    Order at 24-25 (internal citations omitted). Notably, plaintiffs do not challenge
    any of these findings as clearly erroneous, and, in any event, a review of the
    record on appeal indicates that the findings are well supported by the trial
    testimony.
    Moreover, it is clear that the district court took into account the varying
    nature of the expert opinion testimony in this case, including all of Dr. Hall’s
    testimony, in arriving at its conclusion that “[t]he standard of care in the face of
    persistently non-reassuring EFM strips in February 2007 could include a wide
    range of approaches.” Order at 30. And, in turn, the district court evaluated Dr.
    McCutcheon’s care in relation to this wide-ranging standard of care.
    23
    3) Did the district court apply a subjective standard of care?
    Plaintiffs argue that the district court “erroneously established a standard
    requiring [them] to show that Dr. McCutcheon’s personal interpretation of the
    [EFM strip] and his response in relation to his personal interpretation was
    unreasonable.” Aplt. Br. at 25. In support, plaintiffs point to the following
    sentence in the district court’s Order: “‘Consequently, plaintiffs have not shown
    that Dr. McCutcheon’s decisions, based upon his interpretation of the EFM strip
    and clinical assessment of Ms. Gallardo as various points in the labor, constitute
    failures to diligently provide reasonable care or to exercise his best judgment in
    light of his interpretation of the EFM strip and the entire clinical presentation.’”
    
    Id. at 24
    (quoting Order at 30; emphasis added by plaintiffs).
    This argument is nonsensical. As the above-outlined principles of
    Colorado law make clear, it is precisely the decisions made by the defendant
    physician that are at issue in a malpractice case and that, necessarily, are
    compared to the appropriate standard of care. Thus, the district court did not err
    in examining Dr. McCutcheon’s conduct in this case, including his interpretation
    of the EFM strip and his responses to those interpretations.
    To the extent plaintiffs are attempting to argue that the district court
    accepted Dr. McCutcheon’s personal interpretation of the EFM strip as the
    “correct” interpretation, the district court clearly did not do so. Rather, it found
    that the EFM strips in this case were “persistently non-reassuring,” but could be
    24
    interpreted and responded to in differing ways by a reasonable physician. Order
    at 30.
    4) Did the district court erroneously find that Dr. McCutcheon
    examined Ms. Gallardo at 12:35 a.m.?
    Plaintiffs next assert that the district court erroneously found that Dr.
    McCutcheon examined Ms. Gallardo at 12:35 a.m., in response to decelerations,
    when in fact the evidence presented at trial established that a nurse performed the
    examination of Ms. Gallardo. This factual error is significant, plaintiffs assert,
    because the district court relied on ACOG No. 70 to outline the standard of care
    in this situation, and ACOG No. 70 “recommends evaluation and intervention
    with non-reassuring EFM strips to protect the health of the mother and the baby.”
    Aplt. Br. at 27. “In order to find . . . that Dr. McCutcheon met th[e] standard [of
    care outlined in ACOG No. 70],” plaintiffs argue, “the [district] court err[ed] in
    creating an examination that did not occur.” 
    Id. at 28.
    Our review of the trial record persuades us that the district court clearly
    erred in finding that Dr. McCutcheon personally performed the 12:35 a.m.
    examination of Ms. Gallardo. Although the record firmly established that Ms.
    Gallardo was physically examined at 12:35 a.m., the record, as best we can tell,
    indicates that the examination was performed by a nurse rather than Dr.
    McCutcheon. And, notably, the United States does not argue otherwise in its
    appellate response brief.
    25
    But we agree with the United States that this error was harmless and did not
    affect plaintiffs’ substantial rights. See Fed. R. Civ. P. 61. Dr. McCutcheon
    testified that during the labor portion of Ms. Gallardo’s labor and delivery, he was
    “on the labor/delivery deck, which is the nursing station associated with the
    rooms around labor and delivery,” and Ms. Gallardo’s “room was directly
    adjacent to one of the nursing stations.” App. at 422. Dr. McCutcheon further
    testified that he and the nursing staff communicated frequently throughout Ms.
    Gallardo’s first stage of labor, 
    id. at 432,
    and that he gave Ms. Gallardo his full
    attention from Ms. Gallardo’s first push to the end of her delivery, 
    id. at 450.
    Dr.
    McCutcheon also testified that he had confidence in the nursing staff’s assessment
    of the extent of a patient’s dilation. In sum, a reasonable inference from all of
    Dr. McCutcheon’s testimony was that he relied upon the nursing staff’s physical
    examinations of Ms. Gallardo, including the examination performed at 12:35 a.m.
    Consequently, we conclude that the district court did not err in determining that
    Dr. McCutcheon satisfied the standards outlined in ACOG No. 70. In other
    words, we agree with the government that “[w]hether Dr. McCutcheon personally
    performed the exam [at 12:35 a.m.], or had his concerns addressed by a nurse’s
    exam, is not material to the district court’s finding that Dr. McCutcheon
    appropriately responded to a concerning deceleration.” Aplee. Br. at 39.
    26
    5) Did the district court fail to address plaintiffs’ experts’ most
    significant criticisms of Dr. McCutcheon?
    Plaintiffs complain that the district “court’s opinion lacks specific findings
    of fact for the period during which Dr. Hall and Dr. Ross were most critical of Dr.
    McCutcheon,” i.e., “the period from the initiation of pushing at approximately
    12:42 until approximately 1:45.” Aplt. Br. at 28. And plaintiffs assert, citing the
    testimony of their expert witnesses, that “DRG’s condition during this time—as
    evidenced by the EFM—[wa]s rife with signs that she [wa]s being deprived of
    sufficient oxygen due to excessive contractions, excessive pushing, and excessive
    uterine pressure.” 
    Id. It is
    apparent, however, that the district court’s Order contains specific
    findings of fact covering the time period from 12:42 a.m. through 1:45 a.m. See
    Order at 11-13. For example, the district court found that “[t]he first push
    occurred at 12:42 a.m. . . . and was followed by a prolonged deceleration” that
    “[a]ll the experts agreed . . . [wa]s concerning.” 
    Id. at 11.
    And, for each critical
    time segment during this period, the district court expressly noted the criticisms
    leveled at Dr. McCutcheon by plaintiffs’ expert witnesses. 
    Id. at 11-13.
    Thus,
    there is no merit to plaintiffs’ argument.
    Relatedly, plaintiffs argue that the district court “clearly erred by accepting
    Dr. McCutcheon’s assumption of a baseline heart rate” during the period “from
    the initiation of pushing at 12:42 a.m. through 1:30 a.m.” 
    Id. at 30
    (italics in
    27
    original). And the district court in turn erred, plaintiffs argue, “by reviewing Dr.
    McCutcheon’s care based on the assumed baseline” and “erroneously
    conclud[ing] that the care was reasonable.” 
    Id. In concluding
    that Dr. McCutcheon did not breach the standard of care, the
    district court did not necessarily agree with Dr. McCutcheon’s interpretation of
    the EFM strip, particularly Dr. McCutcheon’s conclusion that the strip indicated a
    baseline heart rate of “approximately 160ish,” App. at 517, during the time period
    between 12:42 a.m. and 1:30 a.m. 6 Rather, the district court merely concluded,
    consistent with statements in ACOG No. 70, that obstetrician interpretations of
    EFM strips can vary widely and that EFM strips have limited predictive value,
    particularly with respect to any connection between labor/delivery events and
    cerebral palsy. Although plaintiffs disagree with this conclusion, it is adequately
    supported by the trial record and therefore not clearly erroneous.
    6) Did the district court fail to properly recognize the importance of
    EFM strips?
    Plaintiffs argue that the district court “erroneously concluded that the
    standard of care requiring assessment and intervention is somehow obviated
    because EFM is not perfect.” Aplt. Br. at 33. In support, plaintiffs argue that
    6
    A baseline heart rate is the mean fetal heart rate rounded to increments of
    five beats per minute during a ten-minute segment. A normal baseline heart rate
    is considered by ACOG to be between 110 and 160 beats per minute. A baseline
    heart rate exceeding 160 beats per minute is considered by ACOG to represent
    tachycardia.
    28
    “everyone but the court agreed that EFM provides information about the oxygen
    status of the baby” and “that the late decelerations in this case indicated hypoxia.”
    
    Id. at 34.
    Plaintiffs further argue that the district court “selectively quote[d] and
    as a result misread[] ACOG No. 70,” when, “[i]n fact, ACOG No. 70 supports use
    of EFM, and all of the doctors in this case use EFM to evaluate the oxygen status
    of the baby.” 
    Id. And, plaintiffs
    argue, “[w]hile EFM may not always predict
    when an injury will occur, it guides the standard of care because it notifies the
    physician that there is increased risk of injury.” 
    Id. at 35.
    In sum, plaintiffs
    argue, “[t]he standard of care is to use and pay attention to EFM, [sic] because it
    informs the physician if the baby is at risk of injury, not because it will predict
    whether a specific individual will suffer from cerebral palsy.” 
    Id. at 36.
    There are at least two flaws in plaintiffs’ arguments. To begin with, the
    district court concluded that the standard of care incorporated the use of EFM
    during labor and delivery. Where the district court departed from the plaintiffs’
    position, however, was in concluding that EFM strips have questionable
    predictive value with respect to the relationship between acidosis and resulting
    neurological injury to the baby, and its related conclusion that “[t]he standard of
    care in the face of persistently non-reassuring EFM strips in February 2007 could
    include . . . a wide range of approaches.” Order at 30. Second, and relatedly,
    plaintiffs failed to present sufficient evidence linking DRG’s cerebral palsy to the
    acidosis she experienced as a result of the labor and delivery. Indeed, the only
    29
    tangible evidence on this point was the testimony of Dr. Ross. The district court
    concluded, and we conclude reasonably so based upon the evidence presented to
    it, that Dr. Ross’s opinions were outweighed by other evidence, including, in
    particular, ACOG’s position that the rate of cerebral palsy has remained
    approximately the same over the last 30 years, despite the use of fetal heart rate
    monitoring.
    7) Did the district court allow testimony concerning subsequent
    medical nomenclature?
    In their final argument, plaintiffs assert that the district court erred by
    allowing the government to cross-examine plaintiffs’ expert witness, Dr. Hall,
    “about a category system enacted in 2009 [i.e., ACOG’s Category I through III
    nomenclature], approximately two and a half years after DRG’s birth.” 7 Aplt. Br.
    at 37. By allowing testimony on this category system, plaintiffs argue, the district
    court “enhanced [their] burden of proof by requiring that they show Dr.
    McCutcheon breached the standard of care not only as of the date of DRG’s
    delivery, but also when the care was analyzed under a system put in place
    subsequent to the delivery.” 
    Id. at 37-38.
    “We review a trial court’s decision to
    admit evidence for abuse of discretion.” Ryan Dev. Co. v. Indiana Lumbermens
    Mut. Ins. Co., 
    711 F.3d 1165
    , 1170 (10th Cir. 2013)).
    7
    In 2007, ACOG categorized EFM strips as “reassuring,” “non-reassuring,”
    and “ominous.” In 2009, ACOG revised these categories as “Category I,”
    “Category II,” and “Category III.”
    30
    Our review of the record in this case persuades us that the district court did
    not abuse its discretion in allowing the government to cross-examine Dr. Hall
    regarding ACOG’s category system. To begin with, the government correctly
    notes that plaintiffs’ counsel did not timely object to the admission of ACOG No.
    106, which outlined ACOG’s 2009 categorization system. In any event, even
    assuming that plaintiffs’ objection was timely preserved, our review of the record
    indicates that the government did not introduce ACOG No. 106 in an attempt to
    use it to establish the controlling standard of care in this case. Rather, the
    government simply used it as one tool for cross-examining Dr. Hall in order to
    clarify how obstetricians talk about and classify EFM strips.
    Finally, even assuming that the district court should not have admitted the
    evidence, it is clear that the error was harmless. See generally Storagecraft Tech.
    Corp. v. Kirby, 
    744 F.3d 1183
    , 1190-91 (10th Cir. 2014) (noting that the
    erroneous admission of expert testimony is subject to harmless error review). In
    its written order, the district court focused properly on “[t]he standard of care . . .
    in February 2007.” Order at 30. And in doing so, the district court relied heavily
    on ACOG No. 70, a publication that was issued prior to Ms. Gallardo’s labor and
    delivery. To be sure, the district court briefly referenced ACOG No. 106, which
    was published after Ms. Gallardo’s labor and delivery, but it did so only to
    highlight that ACOG No. 106 continued to agree with ACOG No. 70 “that
    persistently non-reassuring EFM strips, such as [the one in this case], provide
    31
    only a limited amount of clinical guidance to an obstetrician.” 
    Id. at 26.
    III
    The judgment of the district court is AFFIRMED.
    32