Differential Diagnosis and Evaluation for Young Patients with Orthopnea and Palpitations

Most Likely Differential Diagnoses

The American College of Cardiology and Circulation journal suggest that in a young patient presenting with acute orthopnea and chronic palpitations, the primary concerns are supraventricular arrhythmias with acute heart failure, structural cardiac abnormalities, and less commonly, acute valvular dysfunction 1, 2
Supraventricular tachycardia (SVT) with acute decompensation is a possible diagnosis, as chronic palpitations suggest paroxysmal arrhythmia, and acute orthopnea indicates new-onset heart failure or pulmonary congestion 1, 3, 4
Atrial fibrillation with rapid ventricular response can cause both chronic palpitations and acute heart failure symptoms, according to Circulation 5, 4

Structural heart disease with arrhythmia, including mitral valve prolapse, congenital lesions, or cardiomyopathy, is a possible cause, as suggested by the American College of Cardiology and Circulation 1, 6
Wolff-Parkinson-White syndrome is a possible diagnosis, as pre-excitation with paroxysmal tachycardia can present with years of palpitations and acute decompensation 3

The American College of Cardiology recommends a 12-lead ECG as mandatory, looking for pre-excitation, QT prolongation, evidence of atrial fibrillation, SVT, or ventricular arrhythmias 1, 3, 4
Laboratory evaluation should include thyroid-stimulating hormone (TSH), electrolytes, complete blood count, and B-type natriuretic peptide (BNP) to assess for heart failure, as suggested by the American College of Cardiology and Circulation 1, 2, 5, 7
Transthoracic echocardiography should be performed urgently to assess for structural heart disease, evaluate left ventricular function, and look for mitral valve prolapse or other congenital lesions 3, 4

The American College of Cardiology and Circulation recommend hospitalization for patients with syncope, near-syncope, or acute heart failure symptoms, with continuous cardiac monitoring, intravenous access, oxygen therapy, and diuretics if pulmonary congestion is present 1, 2, 7
For documented SVT, vagal maneuvers are recommended as first-line acute treatment, followed by adenosine, beta-blockers for chronic management, and referral to electrophysiology for catheter ablation 3, 4
For WPW syndrome, all patients require electrophysiology referral due to the risk of sudden death, and catheter ablation is the definitive treatment 3, 4

Immediate referral is required for pre-excitation on ECG (WPW syndrome), syncope or near-syncope with palpitations, documented sustained ventricular arrhythmia, structural heart disease on echocardiography, and severe symptoms during palpitations, as suggested by the American College of Cardiology and Circulation 3, 4, 5