Hospitalizations and mortality in the Lung Health Study

Abstract

This report deals with deaths and hospitalizations during the 5-year Lung Health Study, as documented by examination of appropriate records. There were 149 deaths (2.5%) during the study, caused largely by lung cancer and cardiovascular disease, particularly coronary heart disease. A total of 12.8% of participants were hospitalized, with cancer, cardiovascular disease, and nonmalignant respiratory disease accounting for 75% of hospitalizations. There were no significant differences among the original treatment groups for all-cause mortality, lung cancer, or hospitalizations for respiratory disease. Deaths and hospitalizations for cardiovascular disease and coronary artery disease were more common in the smoking intervention plus Atrovent inhaler (SI-A) group, which received ipratropium bromide, than in the smoking intervention plus placebo inhaler (SI-P) group, which received placebo, and the differences approached statistical significance. However, we were unable to find a dose effect, in that differences were not related to self-reported inhaler compliance. In the SI-A group, nine participants were hospitalized for supraventricular tachycardia as compared with two in the SI-P group, and SI-A participants with this condition were unusually compliant with their inhaled medication. When all participants were considered and smoking status considered as a time-dependent covariate, smoking cessation was associated with significant reductions in fatal or nonfatal cardiovascular disease and coronary artery disease.