The effect of obesity on mortality and morbidity after isolated coronary artery bypass grafting surgery

A retrospective study was conducted to determine whether obesity is a
predictor of mortality, morbidity or early readmission to hospital after coronary artery
bypass graft (CABG).
Method: We analyzed a large cohort of 1057 patients who had undergone isolated CABG.
BMI (body mass index) was used as the measure of obesity. The preoperative, intera
operative and postoperative risk factors as well as the complication and 30-day mortality
rates were compared between the two groups (624 (65.5%) normal-weight and 328
(34.5%) obese patients). Chi square test and logistic regression were used in univariate
and multivariate respectively.
Results: Of the 1057 patients, 59% had a normal weight and 31% were obese. An increased
BMI did not increase the risk of 30-day mortality. In addition, increased BMI was not
a predictor of the major complications; arrhythmia, renal complications, neurological
complications, pulmonary embolism (PE) except myocardial infarction(MI) (1.8% vs 0.3%
with p-value= 0.015). Also investigation on mechanical ventilation time, Reintubation,
length of stay in ICU, length of stay in hospital, and readmitting as postoperative variables
revealed no significant difference on these two groups( normal-weight and obese patients)
Conclusion: Obesity increased myocardial infarction after CABG, but it did not affect the
other situations