Comparison between position change after low-dose spinal anesthesia and higher dose with sitting position in elderly patients: Block characteristics, hemodynamic changes, and complications

Abstract

Background:Large numbers of patients are presenting for surgeries with aging-related pre-existing conditions that make them at higher risks of adverse outcomes. Hemodynamic instability due to high sympathetic nerve block largely limits the use of conventional dose spinal anesthesia in high risk elderly patients.Aims and Objectives:We aimed to compare the hemodynamic stability and the block characteristics in low dose spinal anesthesia (5 mg) with immediate position change into supine position versus higher dose of spinal anesthesia (10 mg) with maintaining patient position in sitting position for 3 minutes after the block in elderly high risk population.Settings and Design:This study was a prospective randomized controlled double-blinded clinical study.Materials and Methods:This study was carried on 70 patients of American Society of Anesthesiologists physical status classes I, II, and III aged 50 years old and above, who were scheduled for elective knee and below knee orthopedic surgeries expected to last for 40-60 minutes under spinal anesthesia. Patients were randomly allocated into two groups: group (A) Sitting group n= 35 patients that received 10 mg hyperbaric bupivacaine 0.5% in 2 mL volume intrathecal at level lumbar (L4-5) in sitting position and remained in this position for 3 minutes before turning supine. And, group (B) Supine group n = 35 patients received 5 mg (low dose) intrathecal hyperbaric bupivacaine in 2 mL volume (1 mL hyperbaric bupivacaine 0.5% diluted with 1 ml sterile distilled water) at L4-5 in sitting position then turned supine immediately. The injection will be in the midline over 30 seconds by 25 gauge(G) Quincke needle. We measured the changes of mean arterial blood pressure, heart rate, O2 saturation and the incidence of hypotension and bradycardia intraoperatively as a primary outcome. Also, we measured the characteristics and the duration of the sensory and motor blocks, the duration required till return of bladder function and the satisfaction levels of both the patients and the surgeons as secondary outcomes.Statistical Analysis Used:Student's t-test and Chi-square test were used for analysis.Results:As regards hemodynamics, mean arterial blood pressure and heart rate were significantly lower in group A compared to group B; P-value <0.05, during the intraoperative period, while MABP and HR were significantly decreasing in group A during the initial intraoperative period at 5 min, 10 min, 15 min, 20 min, 25 min, 30 min and 35 min, but in group B these parameters were statistically insignificant throughout the whole procedure P-value >0.05. As regards oxygen saturation, there were no significant differences between both groups or within the same group during the whole intraoperative period. Comparing sensory and motor blocks, sensory block was significantly higher and motor block was significantly dense in group A compared to group B during the first intraoperative period at 5 min, 10 min, 15 min, 20 min and 25 minutes. The recovery times from sensory and motor blocks were signifi...

Low Dose Combined Spinal-Epidural (CSE) Anaesthesia with Blocks for Management of A High-Risk Geriatric Patient with Dilated Cardiomyopathy Posted for TURBT

“…Cenkowski JM 2019 et al showed that low-dose bupivicaine group gain faster recovery of the sensory and motor blockade, early discharge, and better patient satisfaction compared to high dose bupivacaine [9]. Alsaeid et al also found that a small dose of heavy bupivacaine 0.5% (5 mg) provided better hemodynamic stability with minimal side effects in elderly patients [10]. Mehdi Sanatkar et al also showed hemodynamic stability and no ST-T changes with low dose of bupivacaine and sufentanil in patients with CAD [11].…”

Comparison of two low dose local anesthetics in combination with morphine for spinal anesthesia for total knee arthroplasty

“…That is why we preferred the same doses. 13 We used very low dose heavy-bupivacaine in our study but morphine dose 0.1 mg as other studies have applied. The VAS values after 4 and 24 h were low in Group 1.…”