Ultrasound-guided four-nerve combined block and spinal anesthesia in below-the-knee limb amputation in the elderly and blood pressure fluctuations

Here is a set of retrospective data from 72 samples of below-the-knee amputations, including gender, age, surgery time, anesthesia maintenance time, postoperative opioid dosage, and intraoperative blood pressure, as well as the calculated systolic and diastolic blood pressure variability, and the amount of fluid infusion and blood loss during surgery.