The aim of this study is to determine the factors associated with alveolar hypoventilation in terms of cognitive impairment, daytime sleepiness, respiratory function, nocturnal respiratory events This evaluation will clarify the clinical phenotypes of respiratory disease in myotonic steinert dystrophy.
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Change of measurement of spirometry
Timeframe: every year during 5 years
Change respiratory force
Timeframe: every year during 5 years
Change CO2 response (Read test)
Timeframe: every year during 5 years
Change subjective sleepiness (Epworth)
Timeframe: every year during 5 years
change Krupp's Fatigue Severity Scale (KFSS)
Timeframe: every year during 5 years
change cognitive impairment by Trail Making Test A & B
Timeframe: every year during 5 years
change Oximetry
Timeframe: every year during 5 years