Fetal Heart Rate Tracings, Escalation, and Proof of Causation in Birth Injury Litigation

Allegations of missed fetal distress are among the most common theories in birth injury litigation and among the most frequently overstated. An abnormal tracing does not establish that the fetus was being injured. A delayed response does not establish that the delay caused the injury. A defensible claim connects three things: what the tracing showed and when, what response the standard of care required, and what a timely response would probably have changed.

The interpretive framework

Electronic fetal monitoring is interpreted using the nomenclature and three-tier classification adopted at the 2008 workshop jointly sponsored by the Eunice Kennedy Shriver National Institute of Child Health and Human Development, ACOG, and the Society for Maternal-Fetal Medicine (Macones et al., Obstetrics & Gynecology, 2008), and incorporated into ACOG Practice Bulletin No. 106 (2009).

Category I tracings are normal and strongly predictive of normal fetal acid-base status at the time of observation. Category III tracings are abnormal and predictive of abnormal acid-base status at the time observed; they require prompt evaluation and, depending on the clinical situation, efforts to resolve the pattern, including expedited delivery. Category II tracings are indeterminate. They are not predictive of abnormal acid-base status, but they require evaluation, continued surveillance, and reevaluation in the context of the full clinical picture.

Most intrapartum tracings fall into Category II at some point. For that reason, the category label alone rarely decides a case. ACOG Practice Bulletin No. 116 (2010) addresses management of Category II patterns, including the significance of moderate variability and accelerations as indicators that the fetus is not acidemic.

Trend, not snapshot

The central evidentiary question is usually the trajectory of the tracing over time, not a single segment. Loss of variability, recurrent late decelerations, rising baseline, and the disappearance of accelerations may each be individually equivocal; their evolution together may show a fetus whose compensatory reserve is diminishing. The firm has examined failure to act on worsening tracing trends, the significance of lost variability, and why Category II tracings may warrant litigation review in more detail.

A reconstruction should use the complete native tracing, not excerpts printed for the chart, together with the nursing flow sheet, physician notes, uterine activity data, medication records (including oxytocin rates), and the electronic audit trail. Time stamps across these sources frequently disagree, and the discrepancies must be resolved before any interval is characterized as delay.

Escalation is a system function

Recognizing a concerning pattern is the first step. Communicating it to the responsible physician, obtaining a timely bedside evaluation, implementing intrauterine resuscitative measures, and, where indicated, mobilizing the team for operative delivery are distinct steps, often involving different people. The analysis must identify where in that chain the alleged failure occurred.

This distinction determines who is responsible. A nurse who recognized the pattern and could not obtain a timely physician response presents a different case from a nurse who did not recognize it, and both differ from a physician who was informed and chose to continue observation. Where the failure reflects unit staffing, chain-of-command policy, or the availability of anesthesia and operating room resources, Pennsylvania’s corporate negligence doctrine under Thompson v. Nason Hospital, 527 Pa. 330, 591 A.2d 703 (1991), may be implicated, subject to its requirements of actual or constructive knowledge and substantial-factor causation. The firm has addressed failure to escalate in labor and delayed cesarean response time separately.

Causation: what earlier delivery would have changed

A tracing that should have prompted earlier delivery does not, without more, establish that earlier delivery would have prevented the injury. The plaintiff must show, through qualified experts, that the injury was more probably than not sustained during the interval in which a timely response would have intervened, and that the infant’s outcome would have been materially different.

That opinion draws on the evidence that follows delivery: the cord blood gases, Apgar scores and resuscitation course, neonatal signs of multisystem injury, and the pattern and timing of injury on neuroimaging. ACOG’s task force report on neonatal encephalopathy sets out the clinical framework for assessing whether an acute peripartum event contributed to encephalopathy.

In Pennsylvania, Hamil v. Bashline, 481 Pa. 256, 392 A.2d 1280 (1978), permits the jury to determine whether negligence that increased the risk of harm was a substantial factor in bringing it about, once expert evidence establishes the increased risk. New Jersey applies a comparable framework in Scafidi v. Seiler, 119 N.J. 93 (1990). Neither relieves the plaintiff of mechanism-specific proof.

How these cases are defended

The defense will typically contend that the tracing remained within acceptable parameters for the clinical context; that the response was timely given the information available; that the injury occurred before admission or before the monitored interval; or that an alternative process, such as infection, a placental condition, or a genetic or metabolic disorder, better explains the injury. A credible claim anticipates each contention with evidence. The firm’s analysis of how hospitals build causation defense narratives addresses this in more detail.

Threshold

Fetal monitoring cases proceed only where the injury is permanent and the record supports a coherent account of recognition, response, timing, and mechanism. Matters of this kind are often referred by other counsel once the obstetric, neonatal, and neuroradiology expert demands become apparent; they are evaluated under the same standards described in the firm’s birth injury practice.