supine hypotensive syndrome

su·pine hy·po·ten·sive syn·drome

in the supine pregnant woman at or near term, maternal hypotension; maternal hypotension is due to obstruction by the gravid uterus of the inferior vena cava with resulting decrease in venous return to the heart; fetal hypoxia is due to maternal hypotension and obstruction of maternal aorta by the gravid uterus with resulting decrease in placental perfusion.

su·pine hy·po·ten·sive syn·drome

in the supine pregnant woman at or near term, maternal hypotension; maternal hypotension is due to obstruction by the gravid uterus of the inferior vena cava with resulting decrease in venous return to the heart; fetal hypoxia is due to maternal hypotension and obstruction of maternal aorta by the gravid uterus with resulting decrease in placental perfusion.

supine hypotensive syndrome

Sudden fall in blood pressure due to diminished venous return caused by compression of the vena cava by the gravid uterus when the pregnant woman rests flat on her back. The low venous return also results in decreased placental perfusion and potentially in fetal hypoxia.
Synonym: vena caval syndrome
References in periodicals archive ?
During the operation, placing the patient in the reverse Trendelenburg position with a tilt to the left side and continuous monitoring of blood gases may avert the supine hypotensive syndrome and prevent further respiratory difficulties.
Modifications often become unavoidable during the second trimester, largely because of the concern of supine hypotensive syndrome. Some practitioners recommend omitting all supine exercises (ACOG, 2002; Anthony, 2002), while others believe that short periods of no more than five minutes spent lying on the back are acceptable (Anthony, 2008; King & Green, 2002; Moore-Sanders, 2009).
In addition to supine hypotensive syndrome, many women begin to experience specific physiological changes during the third trimester that lead to discomfort, pain, or decreased ability to perform specific movements.
In nor-mal pregnancy, preload will be decreased and inci-dence of supine hypotensive syndrome (SHS) will be increased because of pressure effect of enlarged uterus on inferior vena cava (IVC).1,17
The potential for serious adverse physiological effects as a result of aortocaval compression--the 'supine hypotensive syndrome'--was first highlighted almost 60 years ago (1).
(3.) Howard RK, Goodson JH, Mengert WE Supine hypotensive syndrome in late pregnancy.
* Failure to avoid supine hypotensive syndrome. "This is another oft missed and easy-to-treat condition." he said.
This compression may decrease cardiac output and cause supine hypotensive syndrome. Symptoms include dizziness, nausea, paleness or flushing, and a sense of claustrophobia when lying on the back.
Limit the time lying in the supine position to no more than three to four minutes and offer alternative positions for women who are symptomatic of supine hypotensive syndrome.