# A cross-sectional study of pulmonary and quality of life outcomes in patients with CABG and COPD

## TL;DR

This study compares lung function and quality of life in patients who had heart surgery and those with COPD, finding better outcomes in the heart surgery group.

## Contribution

The study provides real-life clinical evidence comparing pulmonary and quality of life outcomes between CABG and COPD patients.

## Key findings

- CABG patients had better pulmonary function (FVC, FEV1, FEV1/FVC) than COPD patients.
- CABG patients showed significantly better respiratory-related quality of life scores.
- Group status (CABG vs. COPD) was a significant predictor of both lung function and quality of life outcomes.

## Abstract

Pulmonary dysfunction and compromised respiratory quality of life are frequent sequelae in both coronary artery bypass grafting (CABG) patients and those with chronic obstructive pulmonary disease (COPD). In this study, we compared pulmonary function and respiratory-related quality of life between these two patient groups based on real-life clinical data.

A total of 89 patients (42 CABG and 47 COPD) were assessed. Baseline demographics, body mass index (BMI), pulmonary function tests (FVC, FEV1, and FEV1/FVC), and St. George’s Respiratory Questionnaire (SGRQ) scores were compared. Comparisons between groups were made using t-tests and chi-squared tests. Correlation and multiple linear regression analyses identified determinants of FEV1 (%) and SGRQ total scores.

The groups were comparable in age and sex, but BMI was higher in the CABG group (p = 0.002). CABG patients demonstrated significantly better SGRQ total, symptom, and activity scores than COPD patients (p < 0.05). Pulmonary function was also superior in the CABG group for FVC (%), FEV1 (%), and FEV1/FVC (all p < 0.05). Correlation analyses revealed strong associations between lower SGRQ scores and better pulmonary function. A multiple regression analysis identified “group” (CABG vs. COPD) as the only significant predictor of both FEV1 (%) (β = −0.25, p = 0.032) and SGRQ total score (β = 0.29, p = 0.016).

Patients with prior CABG exhibit more favorable lung function and respiratory quality of life than COPD patients. Group status was independently associated with outcomes, suggesting that both groups need tailored rehabilitation and multidisciplinary management. Therefore, multicenter prospective studies are warranted.