Antipsychotics and QT prolongation

Area of Science:

• Pharmacology
• Cardiology
• Psychiatry

Background:

• Cardiac QT prolongation is a risk factor for dysrhythmia and sudden cardiac death.
• Emerging data link antipsychotic drug use to increased cardiac mortality.
• Many antipsychotics are associated with QTc prolongation.

Purpose of the Study:

• To review existing literature on the relationship between antipsychotic medications and cardiac QT prolongation.
• To assess the potential cardiac risks associated with antipsychotic drug use.

Main Methods:

• Comprehensive literature searches were conducted in major biomedical databases (EMBASE, Medline, PsychLIT).
• Reference sections of retrieved articles were meticulously reviewed for additional relevant studies.

Main Results:

• The QTc interval, while challenging to measure precisely, is a recognized predictor of cardiac dysrhythmia and sudden death.
• While direct causality is less clear, antipsychotic use is linked to elevated cardiac mortality.
• Numerous antipsychotic agents have demonstrated a clear association with QTc interval prolongation.
• Methodological limitations prevent definitive conclusions about antipsychotic-induced QTc prolongation risk.

Conclusions:

• Current data are insufficient to quantify the precise risk of dysrhythmia or sudden death from antipsychotics.
• Caution is warranted when prescribing antipsychotics.
• Minimizing risk may involve low-dose prescribing, simple regimens, and avoiding drug interactions.
• Electrocardiographic monitoring and specialist cardiology review may be beneficial in managing patient risk.