Background: Second-generation antipsychotics (SGAs) can cause corrected QT interval (QTc) prolongation as a side-effect. This may limit their clinical use and pose safety concerns for patients.
Aims: To analyse the risk of QTc prolongation associated with eight second-generation antipsychotics and observe the timing characteristics of QTc prolongation events and subsequent changes in medication strategies.
Methods: Using data from the hospital information system of a large mental health centre, this retrospective cohort study included 5130 patients (median follow-up: 141.2 days) treated between 2007 and 2019. A marginal structural Cox model was used to compare the hazard ratios for QTc prolongation associated with various SGAs.
Results: The mean age of the cohort was 35.54 years (s.d. = 14.22), and 47.8% ( = 2454) were male. Ziprasidone, amisulpride and olanzapine were the only SGAs associated with QTc prolongation. Ziprasidone presented the highest risk (hazard ratio 1.72, 95% CI: 1.03-2.85, adjusted = 0.03), followed by amisulpride (hazard ratio 1.56, 95% CI: 1.04-2.34, adjusted = 0.03) and olanzapine (hazard ratio 1.40, 95% CI: 1.02-1.94, adjusted = 0.04).
Conclusion: Ziprasidone, amisulpride and olanzapine are associated with increased risk of QTc prolongation. Regular electrocardiogram monitoring is recommended when clinicians prescribe such drugs.
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