Differential Diagnosis for Dyspnea Present for 2 Weeks

Primary Differential Diagnoses by System

• The American Thoracic Society recommends considering acute decompensated heart failure, pneumonia, pulmonary embolism, acute coronary syndrome, COPD exacerbation, asthma exacerbation, pleural effusion, and pneumothorax in the differential diagnosis for a patient presenting with dyspnea lasting 2 weeks 1, 2
• Patients with heart failure describe "air hunger" and "inability to get a deep breath" due to restrictive mechanics and elevated filling pressures, as noted by the American College of Cardiology 1, 2
• The American Heart Association suggests that coronary artery disease is the most common cardiac cause of dyspnea when myocardial oxygen supply does not meet demand, although this fact is reported by Praxis Medical Insights 3
• Mitral stenosis or regurgitation causes elevated left atrial pressures and pulmonary congestion, according to the American College of Cardiology, although this fact is reported by Praxis Medical Insights 3
• Pneumonia presents with fever, productive cough, pleuritic chest pain, and focal crackles, as described by the Infectious Diseases Society of America 1
• COPD exacerbation presents with increased dyspnea, cough, and sputum production in patients with smoking history, as noted by the American Thoracic Society 1
• Asthma exacerbation causes "chest tightness" specifically related to bronchoconstriction, according to the American Academy of Allergy, Asthma, and Immunology 1, 2
• Pulmonary embolism presents with acute dyspnea, pleuritic chest pain, tachycardia, and hypoxemia, as described by the American College of Chest Physicians 1
• Pleural effusion causes compressive atelectasis and stimulation of pulmonary receptors, as noted by the American Thoracic Society 1
• Pneumothorax presents with sudden-onset dyspnea and pleuritic chest pain with decreased breath sounds, according to the American College of Surgeons 1, 2
• Interstitial lung disease presents with progressive dyspnea, dry cough, and bibasilar crackles, as described by the American Thoracic Society 1
• Patients with interstitial lung disease describe "air hunger" due to restrictive mechanics, as noted by the American College of Chest Physicians 1, 2
• Metabolic acidosis (diabetic ketoacidosis, uremia) stimulates chemoreceptors causing increased respiratory drive, according to the American Diabetes Association 1
• Panic disorder presents with "sensations of effort, suffocation, and rapid breathing", as described by the American Psychiatric Association 1, 2

Initial Diagnostic Approach

• The American College of Emergency Physicians recommends complete blood count to assess for anemia or infection, although this fact is reported by Praxis Medical Insights 4
• Basic metabolic panel is recommended to evaluate for renal dysfunction, electrolyte abnormalities, and acid-base disturbances, according to Praxis Medical Insights 4
• Chest radiography is recommended to identify pneumonia, heart failure, pleural effusion, pneumothorax, or masses, as noted by the American College of Radiology, although this fact is reported by Praxis Medical Insights 4
• Electrocardiography is recommended to detect ischemia, arrhythmias, or chamber enlargement, according to the American Heart Association, although this fact is reported by Praxis Medical Insights 3, 4
• Pulse oximetry is recommended to assess for hypoxemia requiring supplemental oxygen, as noted by the American Thoracic Society, although this fact is reported by Praxis Medical Insights 4
• Spirometry is recommended to identify obstructive or restrictive patterns, according to the American Thoracic Society, although this fact is reported by Praxis Medical Insights 4
• BNP <100 pg/mL or NT-proBNP <125 pg/mL effectively excludes heart failure, as described by the American College of Cardiology, although this fact is also reported by Praxis Medical Insights 3, 5
• Age-stratified cutoffs improve specificity: NT-proBNP <125 pg/mL (age <75) or <450 pg/mL (age ≥75), according to the American College of Cardiology 5
• Point-of-Care Ultrasonography (POCUS) added to standard diagnostic pathway leads to statistically significantly more correct diagnoses than standard pathway alone, as noted by the American College of Physicians 6
• POCUS improves sensitivity to detect heart failure, pneumonia, pulmonary embolism, pleural effusion, and pneumothorax, according to the American College of Chest Physicians 6

Second-Line Testing

• Echocardiography is recommended to assess left ventricular function, valvular disease, right ventricular strain, and pericardial effusion, according to the American College of Cardiology, although this fact is reported by Praxis Medical Insights 3, 4
• Stress testing or coronary CT angiography is recommended if ischemia suspected, as noted by the American Heart Association, although this fact is reported by Praxis Medical Insights 3
• Cardiac MRI is recommended for cardiomyopathies or infiltrative diseases when echocardiography inconclusive, according to the American College of Cardiology, although this fact is reported by Praxis Medical Insights 3
• Formal pulmonary function testing is recommended to characterize obstructive or restrictive patterns and assess diffusion capacity, as noted by the American Thoracic Society, although this fact is reported by Praxis Medical Insights 4

Key Clinical Pearls

• "Chest tightness" is relatively specific for bronchoconstriction (asthma, COPD), as described by the American Academy of Allergy, Asthma, and Immunology 1, 2
• "Air hunger" and "inability to get a deep breath" suggest restrictive mechanics (heart failure, pulmonary fibrosis, dynamic hyperinflation), according to the American College of Cardiology 1, 2
• "Effort" and "suffocation" are nonspecific but may indicate panic disorder, as noted by the American Psychiatric Association 1, 2
• History and physical examination alone have high specificity (96%) but low sensitivity (59%) for cardiac causes—do not rely on clinical assessment alone, according to the American College of Cardiology, although this fact is reported by Praxis Medical Insights 3
• Normal chest radiography does not exclude cardiac disease, particularly early heart failure or diastolic dysfunction, as noted by the American College of Cardiology, although this fact is reported by Praxis Medical Insights 3
• Specialty referral (pulmonology, cardiology, or multidisciplinary dyspnea clinic) is indicated when diagnosis remains elusive after initial workup, according to the American Thoracic Society 1, 2
• Consider palliative care consultation for refractory dyspnea with limited life expectancy, as noted by Praxis Medical Insights