Severe nodal arrhythmia following direct current cardioversion for atrial flutter

Area of Science:

• Cardiology
• Clinical Pharmacology
• Anesthesiology

Background:

• Atrial flutter is a common supraventricular tachyarrhythmia.
• Direct current (DC) cardioversion is a standard treatment for atrial flutter.
• Nodal arrhythmias and hypotension are potential, though uncommon, complications post-cardioversion.

Observation:

• A case report details a patient developing persistent nodal arrhythmia and severe hypotension after DC cardioversion.
• The patient was on sertraline, sotalol, thiopental, and digoxin.
• No organic heart disease or drug toxicity was identified.

Findings:

• The incident occurred despite the absence of underlying organic disease or overt drug intoxication.
• A potential cause identified is the interaction between multiple medications (sertraline, sotalol, thiopental, digoxin) and the DC shock.
• An altered sympathetic/parasympathetic balance during anesthesia is also implicated.

Implications:

• This case highlights the potential for complex drug interactions to precipitate serious cardiac events post-cardioversion.
• It underscores the importance of considering autonomic nervous system balance during anesthesia in patients undergoing cardioversion.
• Further investigation into the synergistic effects of these drugs and electrical therapy may be warranted.