Materials and Methods: Our prospective observational study included 128 patients aged ?65 with ASA classifications of I-III undergoing minor elective surgeries under spinal anesthesia lasting <120 minutes. The patients" preoperative shock index, modified shock index, and shock index by age values were calculated and recorded. Hypotension was defined as mean arterial pressure ? 65 mmHg on two consecutive measurements or < 25% of the baseline value. Hypotensive and normotensive patients" preoperative shock index, modified shock index, and shock index by age values, as well as whether they were admitted to the post-anesthesia care unit, discharge time, and complication rates, were all compared.
Results: The incidence of intraoperative hypotension was 50% (n = 64). The modified shock index has predictive value for predicting hypotension (cut-off point of <0.73). Being female increased the risk of hypotension by 20.047 fold, and a 1-point increase in Charlson Comorbidity Index scores increased the risk of hypotension by 2.058 fold.
Conclusion: The modified shock index arrived at by dividing heart rate by mean arterial pressure, can be used to predict hypotension due to spinal anesthesia in elderly patients.
Keywords : Anesthesia, Spinal; Geriatrics; Hypotension