Neuraxial opioids in geriatrics: a dose reduction study of local anesthetic with addition of sufentanil in lower limb surgery for elderly patients

ABSTRACT

Neuraxial anesthesia in the elderly is associated with exaggerated responses to conventional doses of local anesthetics, thereby increasing the incidence of hemodynamic complications. A double-blind prospective study was carried out in our institute with an aim to compare the hemodynamic stability and quality of the conventional dose of hyperbaric bupivacaine [LA] with low dose of LA and sufentanil in elderly patients scheduled for lower limb surgery, randomized to receive combined spinal epidural anesthesia. A total of 50 elderly patients of ASA grade I and II, divided randomly into groups I and II, of either sex undergoing lower limb surgery under combined spinal epidural anesthesia at our institute attached to a Government Medical College were enrolled for study. Group I received 2.5 ml of intrathecal hyperbaric bupivacaine [LA], while group II received 1.5 ml of intrathecal LA+0.1 ml sufentanil [5 ?g]. Both initial and postoperative subarachnoid block characteristics, hemodynamic and respiratory parameters, duration of analgesia, and side effects were observed and recorded. Statistical analysis was carried out using Chi-square and paired t test. Demographic profile was comparable in both groups. Group I had a greater incidence of hypotension and, consequently, higher use of vasopressors [P<0.05]. Onset of sensory analgesia, time to achieve peak sensory level, and recovery from motor blockade were significantly earlier in group II [P<0.05]. Postoperative consumption of LA through epidural route was significantly higher in group I [P<0.05]. The side effect profile was similar, except for a significantly higher incidence of shivering in group I [P<0.05]. The study established that the dose of a local anesthetic can be safely and significantly lowered by 40%, with addition of low-dose sufentanil, thereby avoiding the hemodynamic fluctuation and providing a stable perioperative and postoperative period in the geriatric population. In addition, duration of sensory analgesia is prolonged and postoperative requirement for the epidural top-up also decreases