Hoshijima Hiroshi, Denawa Yohei, Mihara Takahiro, Takeuchi Risa, Kuratani Norifumi, Mieda Tsutomu, Iwase Yoshinori, Shiga Toshiya, Wajima Zen'ichiro, Nagasaka Hiroshi
Department of Anesthesiology, Saitama Medical University Hospital, Moroyama, Saitama, Japan.
Department of Anesthesiology, Allegheny Health Network, PA, USA.
J Clin Anesth. 2017 Aug;40:16-22. doi: 10.1016/j.jclinane.2017.03.040. Epub 2017 Apr 13.
To evaluate the efficacy of intravenous nitroglycerin (TNG) in preventing intraoperative myocardial ischemia (MI) under general anesthesia. Moreover, we analyzed the hemodynamic changes in heart rate (HR), mean blood pressure (MBP), and pulmonary capillary wedge pressure (PCWP) associated with TNG administration both before and after the induction of anesthesia.
Meta-analysis.
Operating room, cardiac surgery or non-cardiac surgery, all surgeries were elective measurements. We performed a computerized search of articles on PubMed, Scopus, and the Cochrane Central Register of Controlled Trials. Meta-analysis was performed using Review Manager. The data from the individual trials were combined using a random-effects model to calculate either the pooled relative risk (RR) or the weighted mean difference (WMD) with 95% confidence interval (CI). We conducted trial sequential analysis (TSA). The primary outcome was the incidence of MI and the secondary outcomes were hemodynamic changes (HR, MBP, and PCWP).
Using electronic databases, we selected 10 trials with a total of 353 patients for our review. Prophylactic intravenous TNG did not significantly decrease the incidence of MI (RR=0.61; CI, 0.33 to 1.13; P=0.12; I=55). TSA corrected the CI to 0.05 to 7.39 and showed that 9.5% of the required information size was achieved. In terms of hemodynamic changes, intravenous TNG significantly reduced MBP in comparison with the placebo (MBP pre-induction: WMD=-7.27; 95% CI -14.2 to -0.33; P=0.04; I=97%; MBP post-induction: WMD=-5.13; 95% CI -9.17 to -1.09; P=0.01; I=73%).
Our analyses showed that prophylactic intravenous TNG does not reduce the incidence of intraoperative MI. Moreover, TSA suggests that further studies are necessary to confirm the results (GRADE: very low). Prophylactic doses of intravenous TNG significantly reduced the MBP both pre and post anesthesia induction (GRADE: very low).
