Massive Depressive Syncope: Rare Neurocardiogenic Fainting in Severe Depression

Massive depressive syncope is a rare, severe form of neurogenic (vasovagal) syncope triggered by profound depressive episodes.

Pathophysiology

Severe depression → autonomic dysregulation → sudden vagal surge + sympathetic withdrawal → profound hypotension/bradycardia → cerebral hypoperfusion → syncope.

Symptoms

• Sudden fainting, dizziness, lightheadedness
• Nausea, vomiting, blurred vision
• Confusion, brief convulsions (anoxic)
• Rapid recovery post-episode

Management

• Treat underlying depression (antidepressants, psychotherapy, ECT if refractory)
• Volume expansion, compression stockings
• Fludrocortisone or midodrine for refractory hypotension
• Pacemaker (rare, for cardioinhibitory dominant)
• Hospitalization for safety/monitoring if recurrent

Multidisciplinary (psychiatry, cardiology, neurology) approach is essential.