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Antipsychotic medication can prolong the corrected QT (QTc) interval, a heart rhythm measure. Clozapine and olanzapine showed higher risks, necessitating careful electrocardiogram monitoring in psychiatric patients.

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Area of Science:

  • Cardiology
  • Psychiatry
  • Pharmacology

Background:

  • Antipsychotic (AP) medications are frequently prescribed for psychiatric conditions.
  • AP use is associated with QT interval prolongation, a potential cardiac risk.
  • Monitoring QTc interval changes is crucial for patient safety.

Purpose of the Study:

  • To determine the incidence of QTc interval prolongation in psychiatric inpatients treated with APs.
  • To assess the relationship between AP dose and QTc interval changes.
  • To compare QTc prolongation risks among different APs.

Main Methods:

  • 179 patients admitted to a psychiatric unit were enrolled.
  • Electrocardiograms (ECGs) were performed at admission, 3, and 7 days.
  • QTc intervals were calculated using Bazett's formula.

Main Results:

  • 9.5% of patients exhibited QTc interval prolongation.
  • Clozapine (20.59%) and olanzapine (15.38%) were most frequently associated with QTc prolongation.
  • Clozapine showed a significantly higher risk (RR 4.17) compared to haloperidol.

Conclusions:

  • AP use, particularly clozapine and olanzapine, is linked to early QTc interval prolongation in psychiatric inpatients.
  • Rigorous electrocardiographic monitoring is essential when prescribing these APs.
  • Early detection and management of QTc prolongation are vital for preventing adverse cardiac events.