PURPOSE OF STUDY: There have been several reports of sinus bradycardia (SB) occurring after bariatric surgery, however, no study has compared SB between Roux-en-Y gastric bypass and the sleeve gastrectomy. METHODS USED: Data Collection –Data was collected through uniform query of community hospital databaseof patients with inclusion criteria of undergoing bariatric procedure (Roux-en-Y or gastric sleeve) at least 1 month prior to our data collection, no prior history of myocardial infarction, and not medication induced bradycardia. SUMMARY OF RESULTS: Seven of the 45 patients (16%) experienced transient or persistent asymptomatic SB postoperatively, of which 22% (2/9) of them had undergone (Roux-en-Y). HRR was significantly greater in patients with SB (average 123 beats/min) compared to without SB (average 96 beats per minute). SB patients had greater BMI reduction compared to without SB (average 17.25 and 7.98, respectively, p<0.05). Using univariate logistic analysis, the odds of developing SB were 1.127 and 1.149 with a percent decrease in BMI (95% CI: 1.031 to 1.23, p=0.008) or increase in HRR (95% CI: 1.047 to 1.261, p=0.0034), respectively. CONCLUSIONS: Eighteen percent with Roux-en-Y experienced SB compared to 21%with gastric sleeve, hence, the type of bariatric surgery does not play a role. It took an average of 6 months to develop SB postoperatively. Further studies warranted to better understand physiological changes in weight loss.