unstable condition, COPD exacerbation
mild (GOLD 1) or very severe COPD (GOLD 4)
requirement for oxygen therapy at low altitude residence
hypoventilation
pulmonary hypertension
more than mild or unstable cardiovascular disease
use of drugs that affect respiratory center drive
internal, neurologic or psychiatric disease that interfere with protocol compliance including current heavy smoking (>20 cigarettes per day), inability to perform 6 min walk test.
previous intolerance to moderate altitude (<2600m).
exposure to altitudes >1500m for >2 days within the last 4 weeks before the study.
pregnant or nursing patients

NCT02150590_exc_T1
Qualifier
unstable
NCT02150590_exc_T2
Condition
condition
NCT02150590_exc_T3
Condition
COPD exacerbation
NCT02150590_exc_T4
Condition
COPD
NCT02150590_exc_T5
Qualifier
mild
NCT02150590_exc_T6
Measurement
GOLD
NCT02150590_exc_T7
Value
1)
NCT02150590_exc_T8
Measurement
GOLD
NCT02150590_exc_T9
Value
4
NCT02150590_exc_T10
Qualifier
very severe
NCT02150590_exc_T11
Condition
COPD
NCT02150590_exc_T12
Procedure
oxygen therapy
NCT02150590_exc_T13
Condition
hypoventilation
NCT02150590_exc_T14
Condition
pulmonary hypertension
NCT02150590_exc_T15
Condition
cardiovascular disease
NCT02150590_exc_T16
Qualifier
unstable
NCT02150590_exc_T17
Qualifier
more than mild
NCT02150590_exc_T18
Scope
more than mild or unstable
NCT02150590_exc_T20
Condition
psychiatric disease
NCT02150590_exc_T21
Condition
gic or psy  that 
NCT02150590_exc_T22
Condition
l, neuro  that 
NCT02150590_exc_T23
Observation
smoking
NCT02150590_exc_T24
Qualifier
heavy
NCT02150590_exc_T25
Multiplier
>20 cigarettes per day
NCT02150590_exc_T26
Negation
inability
NCT02150590_exc_T27
Procedure
6 min walk test
NCT02150590_exc_T28
Condition
intolerance
NCT02150590_exc_T29
Observation
altitude
NCT02150590_exc_T30
Qualifier
moderate
NCT02150590_exc_T31
Value
<2600m