DyspneaPulmonary Disease, Chronic ObstructiveRespiratory Function TestsExercise ToleranceDyspnea, ParoxysmalForced Expiratory VolumeSpirometryVital CapacityLung Diseases, ObstructiveExercise TestRespiratory MusclesSeverity of Illness IndexCoughAirway ObstructionInspiratory CapacityRadiography, ThoracicBreathing ExercisesQuality of LifeLungBronchodilator AgentsScopolamine DerivativesOxygen Inhalation TherapyTreatment OutcomeFatal OutcomeLung Diseases, InterstitialHeart FailureLung DiseasesLung Volume MeasurementsTomography, X-Ray ComputedBronchial DiseasesHemoptysisRespiratory MechanicsHeart NeoplasmsTracheal NeoplasmsAsthmaTracheal DiseasesAcute DiseaseInhalationWork of BreathingBronchoscopyNatriuretic Peptide, BrainMaximal Voluntary VentilationPulmonary Diffusing CapacityResidual VolumePulmonary EmphysemaPalliative CareProspective StudiesAlbuterolPericardial EffusionPulmonary EmbolismRespirationQuestionnairesWalkingTotal Lung CapacityBronchial Provocation TestsNatriuretic AgentsExpiratory Reserve VolumeCryptogenic Organizing PneumoniaTracheal StenosisChest Pain