Transient Sinus Node Dysfunction Associated with Herpes Simplex Encephalitis.

Area of Science:

• Neurology
• Cardiology
• Infectious Diseases

Background:

• Sinus node dysfunction (SND), including sinus arrest and inappropriate sinus bradycardia, can cause significant symptoms like syncope and dizziness.
• Cardiac pacing is a common treatment for symptomatic SND.
• The potential for intracranial infections to induce secondary SND remains poorly understood.

Observation:

• A patient presented with sinus arrest and transient sinus bradycardia.
• The patient's symptoms were temporally associated with herpes simplex encephalitis (HSE).
• No cardiac pauses were monitored, and bradycardia resolved following HSE treatment.

Findings:

• Herpes simplex encephalitis (HSE) was suspected as the cause of the patient's sinus node dysfunction (SND).
• The resolution of bradycardia after treating HSE supports a potential causal link.
• This case highlights a possible secondary mechanism of SND induced by HSE.

Implications:

• Herpes simplex encephalitis may represent an underrecognized cause of secondary sinus node dysfunction.
• Further research is needed to elucidate the mechanisms by which HSE can affect cardiac electrical activity.
• Understanding this association could inform diagnostic and treatment strategies for patients with both neurological infections and cardiac arrhythmias.