A comparative study of inferior vena cava collapsibility index and brachial artery peak systolic flow velocity variation with passive leg raising in predicting hypotension after induction of general anaesthesia.

Induction of general anaesthesia is often associated with hypotension and is a common scenario faced by anaesthesiologists .The degree of hypotension can depend on age, comorbidities and anaesthetic drugs used during general anaesthesia.Patient’s pre induction volume status can have an effect on post induction hypotension considering long periods of fasting for elective surgeries.The role of IVC measurements in predicting hypotension has been studied previously and found to be useful in critical care and peri operative period.Peak systolic flow velocity in the major arteries like the carotid artery and limb arteries vary with the intravascular volume status , with peak systolic flow velocity increasing with increase in intravascular volume .In recent studies , increase in peak systolic flow velocity of more than 10% after passive leg raising compared to supine position in critically ill patients has been found to be a reliable indicator of hypovolemia and hence helpful in predicting volume responsiveness . Also it can be used when screening IVC is difficult.Hence in this study we try to compare IVC Collapsibility index with brachial artery peak systolic flow velocity variation with passive leg raising in predicting hypotension after induction with general anaesthesia