Do preoperative pulmonary function indices predict morbidity after coronary artery bypass surgery?

Area of Science:

• Cardiology
• Pulmonology
• Thoracic Surgery

Background:

• Prevalence of chronic obstructive pulmonary disease (COPD) varies in cardiac surgery patients.
• The prognostic significance of preoperative COPD for patient outcomes remains debated.

Purpose of the Study:

• To assess morbidity across different COPD severity levels in patients undergoing coronary artery bypass graft (CABG) surgery.
• To evaluate the role of pulmonary function indices in predicting morbidity after CABG.

Main Methods:

• Patients undergoing isolated CABG with cardiopulmonary bypass were included.
• COPD diagnosis and severity were determined using spirometry (FEV1/FVC <0.7) and Society of Thoracic Surgeons (STS) criteria.
• Preoperative pulmonary function tests were used to predict postoperative morbidity.

Main Results:

• 566 patients were included; baseline characteristics were similar between COPD and non-COPD groups.
• Hypertension, recent myocardial infarction, and low ejection fraction were more common in patients with COPD.
• Respiratory failure occurred in 14.1% of controls, 23.5% of mild, 23.4% of moderate, and 21.9% of severe COPD patients, with a borderline significant trend (P=0.057).

Conclusions:

• Patients with varying degrees of COPD experienced higher rates of respiratory failure post-CABG.
• Preoperative pulmonary function testing holds prognostic value for predicting postoperative morbidities in CABG patients.