Assessment of Ultrasonographic Measurement of Inferior Vena Cava Collapsibility Index in Prediction of Hypotension Associated With Tourniquet Release in Total Knee Replacement Surgeries Under Spinal Anesthesia

Administration of intravascular fluids is one of the methods to prevent SA-induced hypotension, but empirical intraoperative volume repletion carries the risk of fluid overload during elective surgery. Over fluid resuscitation is associated with organ dysfunction and higher mortality rate , thus, to avoid ineffective or even harmful intravascular volume expansion, it is important to have tools to predict hypotension and fluid responsiveness.