Patients with chronic obstructive pulmonary disease (COPD) are more likely to die within a year of undergoing elective surgery and to incur higher health care costs than are similar patients without COPD, data suggest.
An analysis of close to a million patient records found that, after adjustment for sociodemographic factors, procedure type, and comorbidities, patients with COPD were 26% more likely to die in the year after surgery than were those without COPD. Moreover, COPD was associated with a 4.6% increase in health care costs.
Previous studies have evaluated outcomes for the first 30 days after surgery. Those data “may not adequately capture the overall burden of surgery and how long it may take patients to recover,” study author Ashwin Sankar, MD, a clinician-investigator at St. Michael’s Hospital and assistant professor of anesthesia at the University of Toronto, told this news organization.
“We found that COPD often coexists with other conditions, like diabetes, coronary artery disease, and frailty,” Dr. Sankar added.
The study was published online in the Canadian Medical Association Journal.
Additional recovery support
The authors analyzed data from 932,616 patients who underwent intermediate-risk to high-risk elective noncardiac surgeries from 2005 to 2019 in Ontario. Procedures included carotid endarterectomy, open or endovascular abdominal aortic aneurysm repair, peripheral arterial bypass, total hip replacement, total knee replacement, shoulder surgery, large-bowel surgery, partial liver resection, pancreaticoduodenectomy, gastrectomy, esophagectomy, nephrectomy, cystectomy, prostatectomy, and hysterectomy.
The researchers quantified the associations of COPD with survival and costs. Their analyses included partial adjustment for sociodemographic factors and procedure type and full adjustment, which included comorbidities.
The primary outcome was all-cause death in the year after surgery; the secondary outcome was total health care costs in that year.
The mean age of the population was 65 years, and 60% of patients were women. A total of 170,482 (18%) patients had COPD. Compared with those without COPD, the patients with COPD were older and were more likely to be male, to be in a lower income quintile, to be residents of long-term care facilities, and to have been admitted to the hospital before surgery. They were also more likely to have comorbidities, including coronary artery disease, heart failure, and lung cancer.
A larger proportion of patients with COPD had frailty and medium to high comorbidity. They also more frequently underwent orthopedic, open upper abdominal, and vascular surgery.
During the year after surgery, 52,021 (5.6%) patients died, including 18,007 (10.6%) with COPD and 34,014 (4.5%) without. Those with COPD were more likely to die within 30 days of surgery (3.4% vs 1.2%).
For patients with COPD, the partially adjusted hazard ratio (HR) was 1.61 for risk of death; the fully adjusted HR was 1.26. COPD also was associated with a partially adjusted relative increase of 13.1% in health care costs and an increase of 4.6% with full adjustment.
Frailty, cancer, and procedure type were factors that modified the association between COPD and outcomes. “Procedures such as open aortic and upper abdominal surgery are associated with higher postoperative risks irrespective of COPD status, whereas others, such as orthopedic and lower abdominal surgery, may be of significantly greater risk for patients with COPD,” the authors wrote. “Our results suggest that perioperative management of patients with COPD requires careful consideration of the multiple domains that contribute to their elevated perioperative risk.
“Our finding that patients with COPD are at risk beyond 30 days after surgery suggests that it may be worthwhile to additionally support these patients’ recovery well beyond the first month after the procedure,” said Dr. Sankar.