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Abstract
Hypotension, the most common side effect after spinal anesthesia, occurs more frequently in geriatric patients with hypertension. Decrease in systemic vascular resistance by sympathetic blockades is one of the major mechanism responsible for hypotension after a spinal block . The incidence of hypotension after spinal anesthesia is 2.2 times higher in patients with hypertension and 2.9 times higher in patients taking betablockers than in patients without these conditions. There have been many attempts to minimize the prevalence of hypotension in patients under spinal anesthesia. In addition, recent research has been carried out to predict the occurrence of hypotension after spinal anesthesia. Heart rate variability (HRV) has been validated as a predictor of hypotension from several researchers. However, there are no studies on the use of HRV to predict hypotension in hypertensive patients after spinal anesthesia. Here, we evaluated the ability of using HRV parameters to predict the occurrence of hypotension after spinal anesthesia in hypertensive patients