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Clinical Drug Investigation
Published in: Clinical Drug Investigation 5/2024

Open Access 15-04-2024 | Paliperidone | Original Research Article

Risk of Cardiovascular Events in Schizophrenic Patients Treated with Paliperidone Palmitate Once-Monthly Injection (PP1M): A Population-Based Retrospective Cohort Study in Taiwan

Authors: Shih-Pei Shen, Li Yan, Tao Wu, Min-Wei Huang, Kuan-Chih Huang, Hong Qiu, Yongjing Zhang, Chao-Hsiun Tang

Published in: Clinical Drug Investigation | Issue 5/2024

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Abstract

Background

Schizophrenia is one of the leading causes of disability. Paliperidone palmitate once-monthly injection (PP1M) was developed to provide consistent drug delivery and improve medication adherence for maintenance treatment. It is well known that patients with schizophrenia have higher cardiovascular risks, however little is known about the cardiovascular risks of patients with schizophrenia treated with PP1M in Asia.

Objective

This study aimed to estimate the incidence of cardiovascular events after initiating PP1M treatment and evaluate the cardiovascular risk associations compared with oral second-generation antipsychotics (SGAs).

Methods

Data from Taiwan’s National Health Insurance Research Database were used to identify a cohort of adult patients with schizophrenia who received any SGAs from 1 March 2012 to 31 December 2018. Patients who initiated PP1M treatment were enrolled for descriptive analysis of incidence rates. PP1M patients were propensity matched 1:1 to patients initiating a new oral SGA, for comparative analysis based on demographics, clinical characteristics and treatment history at baseline, in three-step matching procedures, following the prevalent new-user design to enhance comparability. Follow-up ended at the end of the treatment episode of index drug, death, last record available, or end of the study (31 December 2019). Study endpoints included serious cardiovascular events (including severe ventricular arrhythmia and sudden death), expanded serious cardiovascular events (which further included acute myocardial infarction and ischemic stroke), and cardiovascular hospitalizations. Risks of study endpoints between matched cohorts were compared using Cox regression.

Results

Overall, 11,023 patients initiating PP1M treatment were identified (49.5% were females; mean age of 43.2 [12.2] years). Overall incidences for serious cardiovascular events, expanded serious cardiovascular events, and cardiovascular hospitalizations were 3.92, 7.88 and 51.96 per 1000 person-years, respectively. In matched cohort analysis (N = 10,115), the hazard ratios (HRs) between initiating PP1M and a new oral SGA for serious cardiovascular events, expanded serious cardiovascular events, and cardiovascular hospitalizations were 0.86 (95% confidence interval [CI] 0.55–1.36), 0.88 (95% CI 0.63–1.21), and 0.78 (95% CI 0.69–0.89), respectively.

Conclusion

This study reported the population-based incidence of cardiovascular events in schizophrenic patients initiating PP1M treatment. PP1M was not associated with increased risks of serious cardiovascular events but was potentially associated with lower risks of cardiovascular hospitalizations compared with oral SGAs.
Appendix
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Metadata
Title
Risk of Cardiovascular Events in Schizophrenic Patients Treated with Paliperidone Palmitate Once-Monthly Injection (PP1M): A Population-Based Retrospective Cohort Study in Taiwan
Authors
Shih-Pei Shen
Li Yan
Tao Wu
Min-Wei Huang
Kuan-Chih Huang
Hong Qiu
Yongjing Zhang
Chao-Hsiun Tang
Publication date
15-04-2024
Publisher
Springer International Publishing
Published in
Clinical Drug Investigation / Issue 5/2024
Print ISSN: 1173-2563
Electronic ISSN: 1179-1918
DOI
https://doi.org/10.1007/s40261-024-01358-y

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