In this study we will determine the ability of preoperative ultrasonographic evaluation of the right common femoral vein diameter to predict spinal anesthesia-induced hypotension in elderly patients.
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The sensitivity of the transverse diameter (mm) value of the right common femoral vein as measured by ultrasound before anesthesia to predict spinal aneshesia-induced hypotension in elderly patients.
Timeframe: 30 minutes after spinal anesthesia