Early Invasive Versus Ischemia-Guided Strategy in Non-ST-Segment Elevation Acute Coronary Syndrome With Chronic Obstructive Pulmonary Disease: A National Inpatient Sample Analysis

Abstract

Chronic obstructive pulmonary disease (COPD) is a risk factor for non-ST-segment elevation–acute coronary syndromes (NSTE-ACS). Whether early invasive strategy (EIS) or ischemia-guided strategy (IGS) confers better outcomes in NSTE-ACS with COPD is largely unknown. Nationwide Inpatient Sample database of the United States was queried from 2010 to 2015 to identify NSTE-ACS with and without COPD. Early invasive strategy was defined as coronary angiogram with or without revascularization on admission day 0 or 1, whereas IGS included patients who did not receive EIS. Standardized morbidity ratio weight was used to calculate the adjusted odds ratio. A total of 228 175 NSTE-ACS admissions with COPD were identified of which 34.0% received EIS. In-hospital mortality was lower with EIS in patients with COPD (3.1% vs 5.5%, adjusted odds ratio 0.57, 95% confidence interval 0.50-0.63) compared to IGS, but the magnitude of mortality reduction observed in EIS in patients with COPD was less compared to non-COPD patients ( P interaction = .02). Length of stay was shorter (4.2 vs 4.7 days, P < .0001) but the cost was higher (US$23 804 vs US$18 533, P < .0001) in EIS in COPD. Early invasive strategy resulted in lower in-hospital mortality and marginally shorter length of stay but higher hospitalization cost in NSTE-ACS with COPD.

Association Between Chronic Obstructive Pulmonary Disease and Coronary Artery Disease Severity

“…We read the article entitled “Early Invasive Versus Ischemia-Guided Strategy in Non-ST-Segment Elevation Acute Coronary Syndrome With Chronic Obstructive Pulmonary Disease: A National Inpatient Sample Analysis” with interest. 1 The authors evaluate the intervention strategy in non-ST-segment elevation acute coronary syndrome (NSTE-ACS) patients with chronic obstructive pulmonary disease (COPD) and without COPD.…”

“…In addition, COPD is a risk factor for complex CAD, and only forced expiratory volume 1 (FEV1) is negatively correlated with SYNTAX score. 4 Ando et al 1 showed that NSTE-ACS patients were not systematically tested for the presence of COPD. How did these researchers diagnose COPD anddo they have basal FEV1, forced vital capacity (FVC), total lung capacity (TLC), and functional residual capacity FRC values?…”