50% more patients on esmolol had complete ulcer closure
The proportion of participants with complete ulcer closure at 12 weeks was 60.3% in the esmolol plus standard of care group, compared with 41.7% with standard of care only, a difference of 18.6% (odds ratio, 2.13; P = .0276).
“The 24-week end-of-study data show what happened in the 12 weeks following end of treatment,” said Dr. Rastogi, turning to results showing that by 24 weeks the proportion of participants with complete ulcer closure was 77.2% versus 55.6%, respectively, with a difference of 21.6% (OR, 2.71; P = .013).
Time to ulcer closure (a secondary endpoint) was similar between the esmolol plus standard of care vs. standard of care groups (74.3 vs. 72.5 days).
The impact of ulcer location on complete ulcer closure, a subanalysis, showed a higher proportion of patients experienced complete ulcer closure with esmolol plus standard of care versus standard of care. For example, in plantar-based ulcers, esmolol led to complete closure in 58.7% vs. 43.1%, while for nonplantar ulcers, complete closure was found in 63.6% vs. 38.1%.
In wounds less than 5 cm2, the proportion of complete closures was 66.0% vs. 50.0% for esmolol compared with standard of care alone, while in wounds over 5 cm2, these proportions were 47.6% vs. 26.9%.
Subanalyses also showed that esmolol was substantially better in patients with BMI greater than 25, ulcer duration over 12 weeks, and A1c above 8%.
Also, a subanalysis stratified by “real-life” situations favored esmolol, showing a 50.9% difference in the proportion of patients with diabetic foot ulcer healing in those with a history of hypertension and a 31.8% difference favoring esmolol in those with an abnormal electrocardiogram.
Overall, the proportions of patients who had an adverse event were 13.2%, 18.4%, and 37.5% in the esmolol plus standard of care, standard of care alone, and vehicle plus standard of care groups, respectively, and the vast majority were unrelated to study drug. There were no serious adverse events in the esmolol plus standard of care group.
A class effect of beta blockers?
The proposed mechanism of action of esmolol relates to a sequence of reducing inflammation (via vasodilation, fibroblast migration, and cytokine reduction); proliferation by beta-blockade (improves keratinocyte migration and epithelialization); and remodeling (increases collagen turnover).
Asked by an audience member if the observations were a class effect and systemic effect of beta-blockers, Dr. Rastogi said he could not say for sure that it was a class effect, but they deliberately used a beta-1 adrenergic receptor antagonist.
“It may not be a systemic effect because we have some patients who use beta-blockers systemically and they still have diabetic foot ulcers,” he said.
Dr. Rastogi and Dr. Dhatariya have reported no relevant financial relationships.
A version of this article first appeared on Medscape.com.