Preoperative ultrasonographic evaluation ofthe inferior vena cava collapsibility index to predict intraoperative hypotension during spinal anesthesia in pregnant women undergoing caeserean section-A prospective observational study

Hypotension is the common complication of spinal anaesthesia.  Hypotension during spinal anaesthesia is mainly due to lower preload, resulting from the gravid uterus compressing the inferior vena cava (IVC) and decrease in systemic vascular resistance followed by vascular dilation following spinal anaesthesia. USG has been used in the evaluation of vascular volume status as a non-invasive technique that can be display blood flow morphology, measurement evaluate the compression of IVC and volume status in full term pregnant women. The variation of internal diameter of the IVC is associated with the respiratory phase. During inspiration negative intrathoracic pressure increases the venous flow to the heart and reduce IVC diameter to minimum. In expiration positive intrathoracic pressure decrease the venous return and maximize the IVC diameter at end expiration. This has been defined as inferior vena cava collapse index.

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