Syncope Treatment and Diagnostic Approach

Cardiac Syncope Treatment

The American College of Cardiology recommends that cardiac syncope requires immediate identification and treatment of the underlying cardiac condition, as it is associated with higher mortality risk 3, 4
For arrhythmic causes, the European Heart Journal suggests pacemaker implantation is indicated for bradyarrhythmias and AV blocks causing syncope 5, 6
Implantable cardioverter-defibrillator therapy is recommended for ventricular tachycardia or fibrillation, especially in patients with structural heart disease, according to the Journal of the American College of Cardiology 4, 2
The American College of Cardiology recommends treatment of the underlying cardiac disease, such as valve repair/replacement for severe aortic stenosis, coronary revascularization for ischemia 3, 4
Management of cardiomyopathy with appropriate medications and device therapy when indicated is suggested by Circulation 2
Surgical correction of congenital heart defects when appropriate is recommended by the Journal of the American College of Cardiology 3

For neurally mediated syncope, increased fluid and salt intake to maintain adequate hydration is recommended 7
Physical counterpressure maneuvers, such as leg crossing and squatting, are suggested as first-line treatment for neurally mediated syncope 7
Avoidance of triggering situations, such as prolonged standing and hot crowded places, is recommended for patients with neurally mediated syncope 7
Midodrine may be prescribed for patients with frequent episodes of neurally mediated syncope 7
Fludrocortisone may be used as adjunctive therapy for neurally mediated syncope 7
Discontinuation or dose adjustment of medications that can induce orthostatic hypotension is recommended by the Journal of the American College of Cardiology and Circulation 4, 2
Management of underlying conditions, such as Parkinson's disease and diabetes mellitus, is suggested by Circulation 2
Autonomic testing, including tilt table and cardiac responses to deep breathing and Valsalva maneuver, may be used to guide management of autonomic dysfunction 4, 2

The European Heart Journal recommends that presence of structural heart disease or abnormal ECG should prompt cardiac evaluation, including echocardiography, stress testing, and prolonged ECG monitoring 5, 1
In patients without structural heart disease and normal ECG with recurrent syncope, evaluation for neurally mediated syncope is recommended, including tilt testing and carotid massage 6, 1
For unexplained syncope after initial evaluation, further testing, such as echocardiography, prolonged ECG monitoring, and electrophysiological studies, may be necessary 8

Cardiac syncope carries a higher risk of sudden death and requires more urgent intervention compared to most neurological causes, according to the Journal of the American College of Cardiology and Circulation 4, 2
Despite adequate treatment, syncope may recur in approximately 20% of patients during long-term follow-up 7