Torsade de pointes and low-dose oral haloperidol

Area of Science:

• Cardiology
• Psychopharmacology
• Clinical Case Reports

Background:

• Haloperidol is an antipsychotic medication used for psychoses.
• It is generally considered to have minimal cardiotoxicity.
• Previous reports link oral haloperidol to torsade de pointes, often preceded by QTc prolongation.

Observation:

• Several reported cases associate oral haloperidol with torsade de pointes.
• A prolonged QTc interval frequently preceded these torsade de pointes episodes.
• This prolonged QTc interval has been suggested as a predictor for ventricular arrhythmias in elderly women on haloperidol.

Findings:

• This case report presents an instance of torsade de pointes occurring with low-dose oral haloperidol.
• The episode occurred without a preceding prolonged QTc interval, challenging its predictive value.
• This suggests that torsade de pointes may occur unpredictably even with low haloperidol doses.

Implications:

• The findings challenge the reliability of QTc prolongation as a sole predictor for haloperidol-induced torsade de pointes.
• Clinicians should maintain a high index of suspicion for ventricular arrhythmias even with low-dose haloperidol.
• Further research is needed to understand the mechanisms and predictive factors of haloperidol-associated torsade de pointes.