Methylene Blue Reduces Mortality in Critically Ill and Perioperative Patients: A Meta-Analysis of Randomized Trials

Article summarized by Gabija Valauskaite, MD

DOI: https://doi.org/10.1053/j.jvca.2023.09.037

Published: Journal of Cardiothoracic and Vascular Anesthesia January 2025

Authors: Alessandro Pruna, Alessandra Bonaccorso, Alessandro Belletti, Stefano Turi, Ambra Licia Di Prima, Filippo D’amico, Alberto Zangrillo, Yuki Kotani, Giovanni Landoni

Article description

Summary:
  • The meta-analysis aim was to investigate the effect of methylene blue (MB) on vasodilatory hypotension in critically ill and perioperative patients;
  • Meta-analysis of randomized controlled trials (RCT);
  • The study included 11 randomized controlled trials with a study population sample size of 556 patients;
  • Primary outcomes showed significantly lower mortality in the MB group (15%) compared to the control group (25%) (RR: 0.60, 95% CI, 0.43-0.84, p = 0.003, I2 = 0%), with findings confirmed in septic shock and cardiac surgery subgroups;
  • Secondary outcomes showed a significantly higher mean arterial pressure(MAP) (MD, 8.4 mmHg [95% CI 5.01-11.75] p < 0.001) and systemic vascular resistance (MD, 94.5 dyn/s/cm5 [95% CI 17.73-171.15] p = 0.02) in MB group than in the control group, with no difference in cardiac output (standardized MD, 0.16 [95% CI, -0.25 to 0.57] p = 0.45) between groups;
  • No differences in acute kidney injury, cerebrovascular events, de-novo start of renal replacement therapy, and myocardial injury were detected;
Conclusions:
  • Methylene blue may improve survival in critically ill and perioperative patients, with reductions in ICU and hospital lengths of stay;
  • Further Large-scale, pragmatic RCT studies are needed to confirm the authors’ findings.

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