In this issue of JAMA Surgery, Reitz et al1 report that metformin prescription status was associated with improved 90-day survival and fewer readmissions in a propensity-matched cohort study of more than 5000 patients with diabetes who underwent a major operation in a multicenter, single health care system over a 5-year period. The study results show that preoperative metformin use was associated with lower adjusted hazard ratios of postoperative mortality and readmission. This study demonstrates how variables besides coexisting medical diseases can affect surgical outcomes. Metformin now joins β-blockers, statins, and immunonutrition as preoperative agents associated with improved surgical outcomes. It may be only a matter of time before optimization of postoperative outcomes with perioperative medications and supplements becomes a standard. To answer this question more completely, further analysis or future trials should factor in statin use, as well as whether medications are continued in the postoperative period.
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George EL, Wren SM. Improving Outcomes After Surgery—An Old Medication With Unexpected Benefits. JAMA Surg. Published online April 08, 2020. doi:10.1001/jamasurg.2020.0417
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