Effect of Buerger–Allen Exercises on Lower Extremity Perfusion in Diabetes Mellitus Patients Undergoing Coronary Artery Bypass Grafting With Saphenous Vein Harvesting: A Randomized Controlled Trial

BACKGROUND & PURPOSE: Patients with diabetes mellitus undergoing coronary artery bypass grafting (CABG) with saphenous vein harvesting are at increased risk of impaired lower extremity perfusion and wound-related complications. Buerger-Allen exercises have been proposed to improve peripheral circulation; however, evidence supporting their effectiveness following CABG remains limited. This study evaluated the effect of Buerger-Allen exercises as an adjunct to phase I cardiac rehabilitation on lower extremity perfusion and wound healing in diabetic patients undergoing CABG. METHODS: A randomized controlled trial was conducted involving 60 diabetic patients undergoing CABG with saphenous vein harvesting. Participants were randomly allocated to an intervention group receiving standard phase I cardiac rehabilitation plus Buerger-Allen exercises (n = 30) or a control group receiving standard rehabilitation alone (n = 30). The primary outcome was ankle-brachial index (ABI). Secondary outcomes included wound healing disturbances and peripheral ankle swelling. Postoperative ABI was analyzed using two-way repeated-measures ANOVA, whereas categorical outcomes were analyzed using Fisher's exact test or the Chi-squared test. RESULTS: A significant effect of time on ABI was observed (p = 0.004), whereas neither the group effect (p = 0.754) nor the group × time interaction (p = 0.711) was statistically significant. An earlier resolution of mild wound-related pain was observed on postoperative day 3 in the intervention group (p = 0.038); however, no between-group differences were present on postoperative day 5. No intervention-related adverse events were reported. DISCUSSION: Buerger-Allen exercises were safe and feasible during early postoperative rehabilitation but did not provide additional improvement in lower extremity perfusion beyond standard rehabilitation during the 5-day postoperative period. The isolated improvement in wound-related pain should be interpreted cautiously. CONCLUSION: Buerger-Allen exercises did not significantly improve the primary outcome of lower extremity perfusion following CABG. Although they appeared safe and were associated with transient improvement in wound-related pain, further adequately powered studies with longer follow-up are required to determine whether clinically meaningful benefits exist. TRIAL REGISTRATION: This study was prospectively registered in the Clinical Trial Registry India (CTRI/2023/10/058535).