Pulmonary Disease, Chronic ObstructiveForced Expiratory VolumeSpirometryBronchodilator AgentsLung Diseases, ObstructiveDyspneaRespiratory Function TestsVital CapacityScopolamine DerivativesSmokingSeverity of Illness IndexExercise TolerancePulmonary EmphysemaLungAdministration, InhalationCholinergic AntagonistsPulmonary MedicineSputumRespiratory System AgentsAdrenergic beta-2 Receptor AgonistsBronchitis, ChronicOxygen Inhalation TherapyAlbuterolAdrenal Cortex HormonesInspiratory CapacityEmphysemaQuality of LifeAsthmaRespiratory MusclesCase-Control StudiesExhalationRespiratory TherapyTreatment OutcomeExpectorantsMetered Dose InhalersQuestionnairesNebulizers and VaporizersIpratropiumBronchiRespiratory InsufficiencyExercise TestHospitalizationSmokeEthanolaminesDisease Progressionalpha 1-Antitrypsin DeficiencyPhosphodiesterase 4 InhibitorsBronchitisRisk FactorsIndansBreathing ExercisesTotal Lung CapacityPrevalenceGlycopyrrolateWalkingQuadriceps MuscleCross-Sectional StudiesAirway ObstructionComorbidityAirway RemodelingBiological MarkersPneumoniaAndrostadienesBreath TestsProspective StudiesSmoking CessationMuscarinic AntagonistsRespiratory MucosaNoninvasive VentilationOxygenExercise TherapyInhalationHypercapniaCyclopropanesPulmonary Diffusing CapacityDouble-Blind MethodTime FactorsBronchoscopyLung Volume MeasurementsBronchoalveolar Lavage FluidCohort StudiesPractice Guidelines as TopicBudesonideBlood Gas AnalysisDiaphragmIsodesmosineHealth StatusAminopyridinesWork of BreathingPrimary Health CareNetherlandsGlucocorticoidsAdrenergic beta-AgonistsPulmonary Gas ExchangeActivities of Daily LivingRetrospective StudiesAirway ResistanceSpainDry Powder InhalersPulmonary Ventilation