Prehospital Care in Pregnancy and Childbirth

Prehospital care in pregnancy and childbirth addresses obstetric situations encountered outside the hospital, from the altered physiology of the pregnant patient in any emergency to imminent or precipitous delivery and its immediate complications. Two patients, mother and fetus, must be considered together, and pregnancy changes how illness and injury present and how the patient should be positioned and assessed.

Definition

Prehospital care in pregnancy and childbirth is the assessment and acute management, outside the hospital, of pregnant patients and of labor, delivery, and their immediate complications, recognizing the altered physiology of pregnancy and the simultaneous needs of mother and fetus.

Scope

The entry covers the physiological changes of pregnancy relevant to emergency assessment, the recognition of imminent delivery, the principal peripartum emergencies (such as hemorrhage), and the maternal-fetal relationship that frames priorities. It is a conceptual reference within special populations and does not provide delivery technique, medication, or procedural instructions.

Core questions

• How does the physiology of pregnancy change emergency assessment of any illness or injury?
• How is imminent or precipitous delivery recognized outside the hospital?
• What are the principal peripartum emergencies and how are mother and fetus considered together?

Key concepts

• Maternal-fetal dyad (two patients)
• Physiological changes of pregnancy
• Aortocaval compression and positioning
• Imminent and precipitous delivery
• Postpartum hemorrhage
• Hypertensive disorders of pregnancy

Mechanisms

Pregnancy alters maternal cardiovascular, respiratory, and hematologic physiology: blood volume and cardiac output rise, functional reserve falls, and the gravid uterus can compress the inferior vena cava and aorta when the patient lies supine, reducing venous return. These changes shift normal vital-sign ranges and can mask or exaggerate the response to illness and blood loss, so a pregnant patient may compensate before deteriorating. Care always concerns two patients, because fetal oxygenation depends on maternal circulation, making maternal stabilization the route to fetal well-being. When delivery is imminent, the situation changes from transport to managing birth and its immediate aftermath, where hemorrhage and hypertensive complications are among the leading threats.

Clinical relevance

Understanding the physiology of pregnancy and the maternal-fetal relationship explains why pregnant patients are assessed, positioned, and prioritized differently in emergencies. This entry describes that reasoning as reference material; it is not a basis for individual diagnostic or treatment decisions and contains no procedural or medication guidance.

Epidemiology

Most births occur in planned settings, but a minority occur unexpectedly outside the hospital, and obstetric emergencies arise across pregnancy. Globally, hemorrhage and hypertensive disorders are leading direct causes of maternal death, a substantial share of which is considered preventable, underscoring the importance of timely recognition.

History

Recognition that pregnant patients require a distinct emergency approach grew alongside maternal mortality reduction efforts in the twentieth and twenty-first centuries. International and national guidance, including World Health Organization guidance on managing complications in pregnancy and childbirth, and systematic quantification of the causes of maternal death helped focus attention on the timely recognition and management of obstetric emergencies, including those arising outside the hospital.

Seminal works

• say-2014

Frequently asked questions

Why is a pregnant patient described as 'two patients'?

Because fetal oxygenation and well-being depend on maternal circulation; the fetus cannot be treated independently, so stabilizing the mother is the principal route to protecting the fetus.

Why does positioning matter for a pregnant patient in an emergency?

In later pregnancy the gravid uterus can compress major abdominal vessels when the patient is supine, reducing venous return; awareness of this aortocaval compression is part of why positioning is considered in assessment.