Diagnostic Approach to Orthopnea

Initial Evaluation

The European Society of Cardiology recommends evaluating for specific symptoms associated with orthopnea, including the number of pillows needed to sleep comfortably and peripheral edema, especially in lower extremities 1
Physical examination should focus on vital signs, including blood pressure and heart rate, as well as pulmonary rales/crackles and peripheral edema 2, 3
Fatigue and exercise intolerance are also important symptoms to evaluate 2

Chest X-ray is an essential component to detect pulmonary venous congestion, interstitial edema, pleural effusions, and upper lobe venous diversion 2, 3, 4, 5
A 12-lead ECG should be performed to evaluate for cardiac rhythm abnormalities, evidence of prior myocardial infarction, and left ventricular hypertrophy 2, 4
Laboratory tests, including complete blood count, basic metabolic panel, and natriuretic peptides, can help assess for anemia, renal function, and heart failure 2, 5, 6
Echocardiography is the most useful method for evaluating left ventricular systolic function, diastolic dysfunction, and valvular abnormalities 2, 4, 5, 7

Stress echocardiography and cardiac MRI can be used to evaluate for ischemia and myocardial characterization when cardiomyopathy is suspected 4
Coronary CT angiography can be used to evaluate coronary artery disease 7, 8
Right heart catheterization is the gold standard for diagnosing pulmonary hypertension 1, 8

The initial evaluation should include history, physical exam, chest X-ray, ECG, and natriuretic peptide testing 2, 6
If natriuretic peptides are elevated or chest X-ray shows congestion, proceed to echocardiography to confirm heart failure and characterize type 2, 4
If initial cardiac evaluation is negative, consider pulmonary causes with CT chest and pulmonary function testing 7, 9

Failing to recognize multifactorial causes of dyspnea, which can occur in up to one-third of cases 9
Overlooking non-cardiac causes of orthopnea, such as valvular heart disease, which requires careful auscultation and echocardiography 7, 8
Relying solely on natriuretic peptides, which may be less reliable in certain situations, such as obesity or renal dysfunction 6