TOPLINE:
High-dose antipsychotics, particularly quetiapine, clozapine, and olanzapine, are linked to increased pneumonia risk in patients with schizophrenia, new data show. Monotherapy with high anticholinergic burden also raises pneumonia risk.
METHODOLOGY:
- Using several nationwide data registers, investigators pulled data on individuals who received inpatient care for schizophrenia or schizoaffective disorder (n = 61,889) between 1972 and 2014.
- Data on drug use were gathered from a prescription register and included dispensing dates, cost, dose, package size, and drug formulation. Data on dates and causes of death were obtained from the Causes of Death register.
- After entering the cohort, follow-up started in January 1996 or after the first diagnosis of schizophrenia for those diagnosed between 1996 and 2014.
- The primary outcome was hospitalization due to pneumonia as the main diagnosis for hospital admission.
TAKEAWAY:
- During 22 years of follow-up, 8917 patients (14.4%) had one or more hospitalizations for pneumonia, and 1137 (12.8%) died within 30 days of admission.
- Pneumonia risk was the highest with the use of high-dose (> 440 mg/d) quetiapine (P = .003), followed by high- (≥ 330 mg/d) and medium-dose (180 to < 330 mg/d) clozapine (both P < .001) and high-dose (≥ 11 mg/d) olanzapine (P = .02).
- Compared with no antipsychotic use, antipsychotic monotherapy was associated with an increased pneumonia risk (P = .03), whereas antipsychotic polytherapy was not.
- Only the use of antipsychotics with high anticholinergic potency was associated with pneumonia risk (P < .001).
IN PRACTICE:
"Identification of antipsychotic drugs that are associated with pneumonia risk may better inform prevention programs (eg, vaccinations)," the researchers noted. "Second, the availability of pneumonia risk estimates for individual antipsychotics and for groups of antipsychotics may foster personalized prescribing guidelines," they added.
SOURCE:
The study was led by Jurjen Luykx, MD, Amsterdam University Medical Center, Amsterdam, the Netherlands. It was published online on June 26, 2024, in JAMA Psychiatry.
LIMITATIONS:
Investigators could not correct for all possible risk factors that may increase pneumonia risk in individuals with schizophrenia, such as smoking and lifestyle habits. Also, cases of pneumonia that didn't require hospital admission couldn't be included in the analysis, so the findings may generalize only to cases of severe pneumonia.
DISCLOSURES:
The study was funded by the Finnish Ministry of Social Affairs and Health.
This article was created using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication.
