RESULTS: 598 COPD patients were included in the study.93 patients had old TB scars on their chest X-rays (15.5%). The mean age of the patients with and without TB scars were 66.3 ± 11.3 and 70.1 ± 10.4 years respectively (p=0.002). There were no differences between the groups regarding age, sex distribution, blood count and length of hospital stay (Table 1). In arterial blood gases PC02 was higher in TB scar group (p=0.008). Exacerbation rates during the last 12 months higher in TB scar group (2.46/year versus 1.56/year; p <0.001). Any significant difference between mortality rates after discharge was not detected (Kaplan Meier test, p = 0.08). However, it was found that first COPD diagnosis was made 5 years earlier in COPD patients with old TB scars compared to the patients without TB scars (58.6 ± 12.3 years versus 63.2 ± 11.2 years; p <0.001) and in mortality age 5 years earlier in TB scar group (68,3 ± 11,4 years versus 73,4 ± 9,8; p = 0,001).