Changes in dyspnea, health status, and lung function in chronic airway disease

The purpose of this study was to examine longitudinal changes in clinical parameters in patients with chronic obstructive pulmonary disease (COPD). We postulated that progressive dyspnea and decline in lung function over time would influence or impact patient's health status. Clinical ratings of dyspnea, general health status, and physiologic lung function were measured every 6 mo over a 2-yr period in an original group of 110 male patients with stable but symptomatic COPD and no significant comorbidity. At enrollment, age was 67 +/- 8 yr (mean +/- SD), forced expiratory volume in one second (FEV1) was 1.28 +/- 0.59 I (44 +/- 17% of predicted), and forced vital capacity (FVC) was 2.84 +/- 0.84 I (68 +/- 18% of predicted). A total of 34 patients "dropped out" because of death (n = 20), relocation (n = 7), and other reasons (n = 7). Dyspnea was measured using the transition dyspnea index (TDI), which represented changes from the baseline state; general health status was measured using the Medical Outcomes Study (MOS) 20-item short-form survey; physiologic lung function was assessed by spirometry (FVC and FEV1) and inspiratory muscle strength (PImax). Statistical analyses were performed using all available data for each patient, including results until the time at which patients died or were lost to follow-up.(ABSTRACT TRUNCATED AT 250 WORDS)