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Schizophrenia linked to higher heart rate and QT dispersion in meta-analysisAdults with schizophrenia show higher heart rates and different heart electrical signals compared to healthy people in this large review

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Key Takeaway
Schizophrenia patients show higher heart rate and QT dispersion, indicating potential cardiac risk requiring monitoring.

A systematic review and meta-analysis of observational studies published between 2015 and 2025 synthesized data from 5,648 adults with schizophrenia and 23,636 healthy controls to evaluate cardiac electrophysiological differences. The primary focus was on heart rate and various QT/QTc indices, with secondary outcomes including frontal QRS-T angle, Tp-e interval, and dispersion measures. The analysis revealed that patients with schizophrenia had a significantly higher heart rate compared to controls, with a mean difference of 6.24 bpm (95% CI 2.01-10.46). QT dispersion was also markedly increased, with a mean difference of 13.00 ms (95% CI 3.58-22.42), and QTc dispersion was even more elevated at 21.23 ms (95% CI 18.23-24.23).

Further findings indicated a modest prolongation of QTc in schizophrenia patients, though the QT interval itself showed no significant difference between groups. The frontal QRS-T angle was increased by 26.11 degrees (95% CI 19.10-33.11), and the Tp-e interval was prolonged by 3.92 ms (95% CI 2.35-5.49). Tp-e dispersion was greater by 8.21 ms (95% CI 6.56-9.85), while the Tp-e/QT ratio did not differ significantly. These results collectively point to altered cardiac repolarization in schizophrenia, which may contribute to arrhythmia risk.

From a clinical perspective, these electrophysiological changes underscore the importance of cardiac monitoring in schizophrenia management. Although the study did not report primary outcomes or safety data, the consistent findings across multiple indices suggest a need for heightened vigilance for cardiac events in this population. The meta-analysis design strengthens the evidence, but the observational nature of included studies limits causal inference.

Limitations of the review include the lack of reported primary outcomes, follow-up data, and safety information. Funding and conflicts of interest were not disclosed, and the certainty of evidence was not formally assessed. Despite these gaps, the large sample size and comprehensive outcome assessment provide valuable insights for healthcare providers.

In practice, clinicians should consider baseline cardiac assessments for patients with schizophrenia, especially when initiating or adjusting antipsychotic medications that may affect QT intervals. While this meta-analysis does not establish causality, it highlights a plausible association between schizophrenia and cardiac electrophysiological abnormalities, warranting further prospective studies.

This large review looked at many studies to compare heart health in adults with schizophrenia to healthy people. Researchers checked over five thousand patients with schizophrenia and more than twenty-three thousand healthy adults. They wanted to see if there were differences in how the heart beats and how its electrical signals travel. This information helps doctors understand the condition better without blaming the illness itself.

The review found that people with schizophrenia had a faster resting heart rate than healthy people. On average, their heart beat about six times per minute faster. This means the heart is working a little harder at rest. Doctors can measure this easily during a regular check-up to see how the heart is functioning.

The electrical signals inside the heart also showed some differences. One measure called QT dispersion was higher in patients with schizophrenia. Another measure called QTc dispersion was also much higher. These signals tell doctors how evenly the heart muscle recovers between beats. When these signals are different, it can mean the heart is not resetting perfectly between each beat.

Other electrical measures also showed changes. The frontal QRS-T angle was larger in patients with schizophrenia. The time it takes for the heart to recharge, called the Tp-e interval, was longer. These changes show that the electrical system works a bit differently in these patients. However, the main time for the heart to beat, called the QT interval, did not change much.

Some other electrical measures did not show big differences between the two groups. The Tp-e to QT ratio was similar for both patients and healthy people. This means not every part of the heart electrical system is affected. Still, the overall picture shows that the heart in these patients works in a unique way. Understanding these differences helps doctors take better care of their patients.

The study did not report on side effects or safety issues because the research focused on heart signals. It is important to remember that these are differences found in groups of people, not every single person. Doctors will use this information along with other tests to keep patients safe and healthy.

In conclusion, adults with schizophrenia have a faster heart rate and different electrical signals. These findings come from looking at many studies together. They show that heart health needs special attention for these patients. Knowing these differences helps doctors provide better care and support for everyone.

What this means for you:
Adults with schizophrenia have faster heart rates and different electrical signals than healthy people, which helps doctors monitor heart health.

Study Details

Study typeMeta analysis
Sample sizen = 5,648
EvidenceLevel 1
PublishedMay 2026
View Original Abstract ↓
BACKGROUND: Patients with schizophrenia experience a markedly increased risk of sudden cardiac death that cannot be fully explained by conventional cardiovascular risk factors or QTc prolongation alone. Novel electrocardiographic markers reflecting ventricular repolarization heterogeneity may provide more sensitive indicators of arrhythmic vulnerability. METHODS: We conducted a systematic review and meta-analysis of observational studies published between 2015 and 2025 comparing traditional and novel ECG repolarization markers in adults with schizophrenia and healthy controls. PubMed, Scopus, Embase, and Web of Science were searched. Outcomes included heart rate, QT/QTc indices, frontal QRS-T angle, Tp-e interval, Tp-e/QT ratio, and dispersion measures. Pooled mean differences (MDs) with 95% confidence intervals were estimated using random-effects models, with subgroup analyses according to treatment status (drug-naïve vs medicated). RESULTS: Eleven studies comprising 5648 patients with schizophrenia and 23,636 healthy controls were included. Compared with controls, patients with schizophrenia exhibited a higher heart rate (MD = 6.24 bpm, 95% CI 2.01-10.46), increased QT dispersion (MD = 13.00 ms, 95% CI 3.58-22.42), and markedly elevated QTc dispersion (MD = 21.23 ms, 95% CI 18.23-24.23), while QTc prolongation was modest and QT interval showed no significant difference. Novel repolarization markers demonstrated pronounced abnormalities, including an increased frontal QRS-T angle (MD = 26.11°, 95% CI 19.10-33.11), prolonged Tp-e interval (MD = 3.92 ms, 95% CI 2.35-5.49), and greater Tp-e dispersion (MD = 8.21 ms, 95% CI 6.56-9.85), whereas the Tp-e/QT ratio did not differ significantly. These electrophysiological alterations were consistently observed in both drug-naïve and medicated patients. CONCLUSIONS: Schizophrenia is associated with pronounced ventricular repolarization heterogeneity that extends beyond conventional QTc prolongation and is evident even in drug-naïve patients. To our knowledge, this is the first systematic review and meta-analysis to comprehensively quantify both traditional and novel ventricular repolarization markers in schizophrenia.
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