Stopped: unexpectedly slow recruitment
The purpose of this study is: * to evaluate the optimal time-point for percutaneous dilation tracheostomy in COPD patients in terms of duration on mechanical ventilation, length of stay on ICU and mortality; * to evaluate the rate of infections and infectious complications of tracheostomized COPD patients; * to evaluate the spectrum of pathogens in tracheostomized and intubated COPD patients; * to evaluate the amount of sedatives used in mechanically ventilated COPD patients; * to assess the quality of life in COPD patients tracheostomized after 3 or after 10 days.
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Cumulative duration of mechanical ventilation (in days)
Timeframe: Day 1 - 28