Differential Diagnoses for Intermittent Dyspnea

Primary Differential Diagnoses by Pattern

The American Thoracic Society recommends prioritizing cardiac causes, such as exercise-induced ischemia, diastolic heart failure, and arrhythmias, for intermittent dyspnea, based on the episodic nature of symptoms 1, 2
The American College of Cardiology suggests that diastolic heart failure causes dyspnea primarily with exercise rather than at rest, with patients describing "air hunger" and "inability to get a deep breath" due to elevated filling pressures and restrictive mechanics 2, 3
The American Heart Association recommends identifying exercise-induced arrhythmias and chronotropic incompetence through cardiopulmonary exercise testing showing abnormal heart rate response patterns 4
The European Respiratory Society states that asthma is characterized by episodic "chest tightness" specifically related to bronchoconstriction, which is relatively specific for this diagnosis 1, 2, 3

The American College of Physicians recommends asking about symptom triggers, such as exertion, specific activities, time of day, environmental exposures, or emotional stress, to help diagnose intermittent dyspnea 1
The American Thoracic Society suggests determining the quality of dyspnea, such as "chest tightness" suggesting bronchoconstriction, "air hunger" suggesting restrictive mechanics or heart failure, and "effort" and "suffocation" possibly indicating panic disorder 1, 2, 3
The American Heart Association recommends assessing for cardiac symptoms, such as orthopnea, paroxysmal nocturnal dyspnea, and peripheral edema, which suggest heart failure 5

The American College of Cardiology recommends echocardiography to assess left ventricular systolic and diastolic function, valvular disease, and right ventricular strain when initial testing is nondiagnostic 4, 3
The European Respiratory Society suggests stress testing, such as exercise ECG or imaging, to provoke ischemia or arrhythmias that occur only with exertion 3
The American Thoracic Society recommends formal pulmonary function testing with DLCO to characterize obstructive or restrictive patterns and assess gas exchange 3

The American College of Physicians states that "chest tightness" is relatively specific for bronchoconstriction and should prompt a bronchodilator trial 1, 2, 3
The American Heart Association suggests that "air hunger" and "inability to get a deep breath" suggest restrictive mechanics from heart failure, dynamic hyperinflation, or pulmonary fibrosis 1, 2, 3
The American Thoracic Society recommends considering specialty referral, such as pulmonology, cardiology, or a multidisciplinary dyspnea clinic, when diagnosis remains elusive after initial workup 1, 3