Shy-Drager SyndromeMultiple System AtrophyPure Autonomic FailureOlivopontocerebellar AtrophiesAutonomic Nervous System DiseasesHypotension, OrthostaticSupranuclear Palsy, Progressivealpha-SynucleinAtrophyParkinson DiseaseVentilators, MechanicalPutamenSynucleinsMidodrineCerebellar AtaxiaInclusion BodiesAutonomic Nervous SystemLewy Body DiseaseSyndromeVagus Nerve DiseasesThioninsTonic PupilDiagnostic Techniques, NeurologicalStriatonigral DegenerationSweat Gland DiseasesParkinsonian DisordersParkinson Disease, SecondaryVocal Cord ParalysisLewy BodiesSpinocerebellar DegenerationsSweating, GustatoryOligodendrogliaPupil DisordersBrain StemExtrapyramidal TractsGait AtaxiaBrainRecurrent Laryngeal NerveSupine PositionMuscular AtrophyREM Sleep Behavior DisorderShynessHeart FailureNeurologic ExaminationNeurodegenerative DiseasesLevodopaReflex, Abnormal