Objective:

To evaluate subarachnoid analgesic modes fentanyl-bupivacaine and bupivacaine in surgery procedures of low abdomen.

Material and methods:

An analytic longitudinal prospective study was performed at the «Manuel Ascunce Domenech» University Hospital in Camagüey, from January 2015 to December 2017. The universe was compound by 180 patients. Sample was selected about 60 patients by probabilistic simple random sampling distributed in two groups: A (fentanyl-bupivacaine) and B (bupivacaine) according to inclusion criteria. The data were collected in questionnaire properly to investigation with baseline data in Statistical Package for Social Sciences. A univariate and multivariate analysis were conducted.

Results:

Complications and adverse reactions and their probability of presentation in the fentanyl-bupivacaine group was greater, drowsiness (3.5 times), arterial hypotension (2.8 times), pruritus (2.1 times) and bradycardia (2.1 times) corroborated by confidence intervals. This group had ten times more probability to have tolerable trouble or no pain (OR = 10.2) that bupivacaine group, all of which showed moderate pain; 10 times more probability of analgesia higher to 3 hours (OR = 10.7) versus bupivacaine with analgesia from 30 minutes to 3 hours and 8 times more probability to perceive good satisfaction (OR = 7.8).

Conclusions:

Evaluation of pain postoperative and analgesic time were better in patients managed with fentanyl-bupivacaine that resulted in analgesic of the greatest quality although prevailed drowsiness, arterial hypotension, pruritus and bradycardia like adverse reactions.