The study is conducted as a retrospective uni-center observation study of a population of COPD patients who after discharge from hospital for acute COPD exacerbation, or during outpatient treatment for acute COPD exacerbation, was monitored for 2 weeks by TVC during a pilot project period from 16 April 2010 to 31 December 2011. To study a possible change in amount of hospital admissions we have compared the frequencies and durations of such events before and after TVC in comparable time periods.