The effect of chronic obstructive pulmonary disease's severity on complications after coronary artery bypass graft surgery

Smoking is an important etiologic factor for cardiac and pulmonary diseases. Chronic Obstructive Pulmonary Disease (COPD) is common in candidates for Coronary Artery Bypass Graft (CABG) surgery. Severity of COPD is determined with spirometry. The aim of this study was comparison of complications after CABG in COPD patients with different severity and without COPD.
This study is a cross sectional research. We divided 125 CABG patients more than 40 years old based on preoperative spirometry to four groups: without COPD (60), mild (29), moderate (24) and severe (12). Spirometry was done using spirometer MIR, made in Italia. Mortality and postoperative complications including cardiovascular and respiratory were recorded until 30 days after the surgery. Data were analyzed by SPSS, fisher exact test and 2χ, and P˂0.05) was considered significant.
Complications with significant difference between groups were atrial fibrillation (AF) and delirium. Frequency of AF was: Without COPD 6 (10%), mild COPD 6 (20.70 %), moderate COPD 7 (29.20%), and severe COPD 5 (41.70%) (P=0.02), and delirium was: Without COPD 3 (5%), mild COPD 1 (3.40%), moderate COPD 3 (12.5%), and severe COPD 5 (41.70%) (P=0.003).
Based on our results, COPD even moderate and severe is not contraindication of CABG. These patients should be carefully evaluated before surgery and must be treated preoperative completely by the specialist. Under this condition, patients can tolerate and benefit from surgery with acceptable risk.