• Selina D Patel, Ashraf S Habib, Sioned Phillips, Brendan Carvalho, and Pervez Sultan.
• From the Department of Anesthesiology and Perioperative Medicine, University of Miami Miller School of Medicine, Jackson Memorial Hospital, Miami, Florida.
• Anesth. Analg. 2018 Feb 1; 126 (2): 552-558.

BackgroundThe objective of this meta-analysis was to determine the efficacy of glycopyrrolate at reducing spinal hypotension during cesarean delivery.MethodsA literature search was performed to identify randomized controlled trials investigating the effect of glycopyrrolate on spinal-induced hypotension during cesarean delivery. Primary outcomes were intraoperative hypotension and vasopressor requirement (phenylephrine equivalents). Secondary outcomes included heart rate (HR), nausea and vomiting, dry mouth, and Apgar scores. Risk ratios (RRs), and mean differences (MDs) were calculated using random-effects modeling with 95% confidence intervals for primary outcomes and 99% confidence intervals for secondary outcomes.ResultsFive randomized controlled trials met our inclusion criteria. A total of 311 patients were included: 153 received glycopyrrolate and 158 placebo. The incidence of spinal-induced hypotension was no different with prophylactic glycopyrrolate compared to control (RR, 0.93 [0.71-1.21]; P = .59), but the total phenylephrine dose required was significantly reduced with glycopyrrolate (MD, -62.64 μg [-107.61 to -17.66 μg]; P = .006). The maximal HR achieved in the glycopyrrolate group was significantly higher compared to controls (MD, 15.85 bpm [5.40-26.31]; P < .0001); however, the incidence of bradycardia was not statistically different. The incidence of intraoperative nausea and vomiting was not different between groups; however, glycopyrrolate increased the risk of dry mouth (RR, 5.15 [1.82-14.57]; P < .0001). Apgar scores at 1 and 5 minutes did not differ between groups.ConclusionsProphylactic glycopyrrolate does not reduce the incidence of spinal-induced hypotension but results in a modest reduction in vasopressor requirements while increasing maternal HR.

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