Perimortem Cesarean Delivery

Perimortem cesarean delivery — increasingly termed resuscitative hysterotomy — is delivery of the fetus by cesarean during cardiopulmonary resuscitation of a pregnant woman in cardiac arrest. Its primary purpose is to improve the chance of maternal resuscitation by relieving aortocaval compression, with possible benefit to the fetus as a secondary aim. This entry summarizes the rationale, timing concept, and place of the procedure as a reference topic.

Definition

Perimortem cesarean delivery (resuscitative hysterotomy) is the surgical delivery of the fetus by cesarean performed during cardiopulmonary resuscitation of a pregnant woman who is in cardiac arrest, undertaken chiefly to aid maternal resuscitation.

Scope

The entry describes the physiologic rationale for delivering the fetus during maternal cardiac arrest, the conceptual emphasis on early decision-making as part of resuscitation, and the way the procedure is positioned within obstetric and resuscitation guidance. It is descriptive and educational; it does not provide procedural instructions, dosing, timing targets to be applied to an individual, or any individualized clinical advice.

Core questions

• Why can delivering the fetus help resuscitate a pregnant woman in cardiac arrest?
• How is the procedure conceptually integrated into the resuscitation response?
• What is the evidence base, and why does it rest largely on case reports and expert consensus?
• How do obstetric and resuscitation guidelines frame the procedure?

Key concepts

• Resuscitative hysterotomy
• Aortocaval compression by the gravid uterus
• Maternal cardiac arrest
• Relief of caval compression to improve venous return
• Early decision as part of resuscitation
• Maternal benefit as the primary aim
• Gestational-age considerations

Mechanisms

In later pregnancy the gravid uterus can compress the inferior vena cava and aorta when the woman is supine, reducing venous return and the effectiveness of chest compressions during cardiac arrest. Emptying the uterus by cesarean relieves this aortocaval compression, which can improve maternal circulation and the chance that resuscitation succeeds; any fetal survival is a secondary benefit. Because of this physiology, guidance frames the decision to deliver as part of the resuscitation itself rather than a separate obstetric step, with emphasis on early consideration when arrest does not respond promptly to standard measures.

Clinical relevance

Perimortem cesarean delivery is a rare, high-stakes procedure whose rationale is primarily maternal resuscitation. This entry presents the concept, physiologic rationale, and the framing given by guidelines and reference texts; the actual decision, timing, and conduct are governed by resuscitation and obstetric guidelines and individual clinical judgement, which this reference does not provide. No timing targets given here should be applied to an individual case.

Epidemiology

Maternal cardiac arrest is uncommon, and perimortem cesarean delivery is correspondingly rare, so the descriptive literature consists largely of case reports and series rather than trials. Reported experience has been reviewed to characterize maternal and neonatal outcomes and to re-examine longstanding assumptions about the procedure.

Evidence & guidelines

The evidence base is observational — case reports and series synthesized in reviews — rather than randomized. Influential reviews re-examined earlier assumptions about timing and outcomes, and consensus guidance from the American Heart Association and the Society for Obstetric Anesthesia and Perinatology positions the procedure within the management of cardiac arrest in pregnancy, emphasizing early decision-making as part of resuscitation.

History

Delivery during maternal death or dying has ancient roots, but the modern concept of perimortem cesarean delivery as an aid to maternal resuscitation was articulated in the late twentieth century, notably through reviews that proposed early delivery during arrest. A widely cited 2005 review revisited these assumptions, and subsequent resuscitation and obstetric-anesthesia consensus statements formalized the procedure's place; the term resuscitative hysterotomy has gained favor to stress its maternal purpose.

Debates

Timing and the framing of the procedure

Longstanding teaching emphasized a short interval from arrest to delivery, but reviews of accumulated cases questioned whether the original assumptions held universally, and guidance has shifted toward treating early delivery as an integral part of resuscitation rather than a fixed deadline applied rigidly.

Seminal works

• katz-2005
• jeejeebhoy-2015

Frequently asked questions

What is the main purpose of a perimortem cesarean delivery?

Its primary purpose is to help resuscitate the pregnant woman by relieving compression of the major abdominal vessels by the uterus, which can improve circulation during CPR. Fetal survival is a secondary aim.

Why is the procedure now sometimes called resuscitative hysterotomy?

The term resuscitative hysterotomy emphasizes that the procedure is performed chiefly to aid maternal resuscitation, rather than primarily for the fetus, which is reflected in current resuscitation guidance.