Management of Supine Hypotension

Context-Specific Management

The American College of Obstetricians and Gynecologists recommends left lateral positioning as the primary intervention to relieve aortocaval compression caused by the gravid uterus compressing the inferior vena cava in pregnant women after 20 weeks gestation 1
The enlarged uterus can decrease cardiac output by up to 24% at 32 weeks when supine compared to left lateral position 1
The European Society of Cardiology suggests adequate hydration and salt intake (2-3 L fluids daily, 10 g NaCl) as a non-pharmacologic first-line intervention for orthostatic hypotension 2
The European Society of Cardiology recommends head-up tilt sleeping at 10° to prevent nocturnal polyuria and maintain favorable fluid distribution in patients with orthostatic hypotension 2

The American Heart Association recommends placing the patient supine as the fundamental intervention when hypotension occurs in any setting without IV access 3
Elevating the legs to 45° for 2 minutes produces median increases of 5-7 mmHg in mean arterial pressure and 8-12 mmHg in systolic blood pressure, providing temporizing support 3

The American College of Cardiology distinguishes supine hypotension from orthostatic hypotension, noting that supine hypotension improves with sitting/standing, while orthostatic hypotension worsens with sitting/standing 1
The American College of Cardiology notes that the treatment strategies for supine hypotension and orthostatic hypotension are opposite, with supine hypotension requiring getting off the back and orthostatic hypotension requiring getting on the back 1, 4

La elevación pasiva de piernas moviliza aproximadamente 300 mL de sangre desde las extremidades inferiores hacia el tórax, aumentando temporalmente la precarga sin cambiar el volumen intravascular total del paciente 5
La elevación pasiva de piernas moviliza aproximadamente 300 mL de sangre desde las extremidades inferiores hacia la circulación central 5

A los 20 segundos: Aumento significativo del gasto cardíaco (0.6 L/min) y volumen sistólico (7 mL) 6
A los 7 minutos: Estos efectos beneficiosos desaparecen completamente, sin diferencias significativas en presión arterial media, gasto cardíaco o frecuencia cardíaca 6, 7

Cruzar las piernas aumenta la presión arterial media en 13 mmHg en pacientes con falla autonómica, y ponerse en cuclillas aumenta la presión arterial media en 44 mmHg en estos pacientes, estas maniobras de contrapresión física pueden ser más efectivas que la EPP para síntomas sostenidos 8