Expert evidence in obstetric claims: Navigating causality in cases of cerebral palsy with complex neonatal risk factors

In clinical negligence litigation, claims involving cerebral palsy present significant challenges regarding the distinction between avoidable intrapartum events and pre-existing fetal physiology or non-negligent antenatal factors. Understanding the interplay between obstetric, neonatal, and neurological evidence is essential for solicitors to assess the viability of a claim and to ensure that expert instruction aligns with the requirements of CPR Part 35.

The Clinical and Evidentiary Framework

The assessment of causation requires a rigorous examination of the clinical timeline. The primary objective is to differentiate between insults occurring during the intrapartum period and background factors that may have influenced the infant’s neurological outcome. In practice, this often involves a detailed critique of fetal heart rate monitoring—specifically CTG interpretation—and the timeliness of clinical responses to evidence of fetal compromise.

The analysis frequently necessitates an integrated view of neonatal encephalopathy staging. Where cases involve complex physiological profiles, instructing solicitors should determine whether a singular obstetric expert is sufficient, or if the claim requires a multi-disciplinary approach. For instance, when there are questions regarding the timing of injury, or where there are comorbidities involving cardiac or neurological developmental pathways, the strength of the evidence is often enhanced by synchronised opinions from consultants across relevant subspecialties, such as neonatology or paediatric neurology.

Legal Framework and the Role of the Expert

Under CPR Part 35, an expert witness has an overriding duty to the court to provide independent, objective evidence. When dealing with allegations of breach of duty, the court applies the Bolam test, as refined by Bolitho, to determine whether the actions of the clinician were supported by a responsible body of medical opinion. In causation, the claimant must establish on the balance of probabilities that, but for the alleged breach, the injury would have been avoided.

Expert evidence is restricted by CPR 35.1 to what is reasonably required for the proceedings. Solicitors should be mindful of the following procedural distinctions:

• Screening Reports: Used for early identification of whether clinical records indicate a potential breach of duty or a viable causal link.
• Breach and Causation Reports: Detailed assessments of the obstetric management and the physiological consequences of alleged delays in intervention, prepared in accordance with the content requirements of CPR 35.10.
• Joint Statements (CPR 35.12): Where the court directs or the parties agree to a meeting of experts from the same or different disciplines, these statements serve to narrow the issues. It is critical that these statements reflect the expert’s independent clinical opinion and are not influenced by litigation strategies.
• Single Joint Experts (CPR 35.7): Where the court directs the instruction of a single joint expert to provide neutral evidence on a specific technical issue, the instruction process is governed by CPR 35.8.

Identifying and Matching Subspecialties

A common risk in obstetric negligence claims is the under-inclusion of necessary subspecialty expertise. An obstetrician may provide a definitive opinion on intrapartum management, but a paediatric neurologist is often required to interpret the neurological sequelae and the clinical indicators of neonatal encephalopathy. If a case involves complex neonatal risk factors, such as suspected cardiac influences on brain oxygenation, the instruction of both an obstetrician and a neonatal-specialist paediatrician may be necessary to create a coherent narrative of causation. Evaluating the evolution of neurological evidence remains central to establishing these causal links in birth injury litigation.

Coordinating multi-disciplinary input allows solicitors to ensure that evidence is consistent across physiological events. This reduces the risk of fragmented evidence where experts from different disciplines might otherwise provide conflicting interpretations of the same clinical dataset.

Practical Guidance for Instructing Solicitors

When preparing instructions in obstetric cerebral palsy matters, the following steps assist in securing high-quality, court-ready evidence:

1. Document Management: Ensure the expert has access to the full, contemporaneous fetal monitoring records, blood gas results, and long-term neurodevelopmental assessments.
2. Subspecialty Definition: Clearly define the scope of the instruction. If the claim hinges on the management of fetal bradycardia, ensure the obstetric expert is a consultant with a specific, relevant interest in high-risk intrapartum care.
3. Chronology Accuracy: Provide a clear, neutral chronology. While experts will form their own view of the facts, an organised bundle allows the expert to focus on clinical analysis rather than administrative collation.
4. Proportionality: Use questions under CPR 35.6 to refine the expert’s focus, particularly if an initial report has left ambiguity regarding the causal link between a specific event and the resulting clinical condition.