Aortocaval compression syndrome

Aortocaval compression syndrome, also known as supine hypotensive syndrome, is compression of the abdominal aorta and inferior vena cava by the gravid uterus when a pregnant woman lies on her back, i.e. in the supine position. It is a frequent cause of low maternal blood pressure (hypotension), which can result in loss of consciousness^[1] and in extreme circumstances fetal demise.^[2][3]

Aortocaval compression syndrome
Other names	Supine hypotensive syndrome
A watercolor drawing of a pregnant woman lying flat on her back, causing the aorta and inferior vena cava to compress and reduce circulation.
Specialty	Obstetrics and gynaecology

Signs and symptoms

Aortocaval compression syndrome may cause syncope, restlessness, dizziness, headache, tinnitus, visual disturbances, numbness or paresthesia of the limbs, abdominal/chest discomfort or pain, nausea, and vomiting.^[4] Some patients may be asymptomatic.^[5]

See also

• Inferior vena cava syndrome
• Complications of pregnancy