What is the clinical evidence from this study?

Study design: Meta-Analysis. Population: nonischemic dilated cardiomyopathy (n=6088). Intervention: Risk stratification tests (e.g., fragmented QRS, T-wave alternans). Primary outcome: arrhythmic events (OR 6.73, 95% CI 3.85-11.76).

What question did this study set out to answer?

To evaluate and estimate the effectiveness of 12 risk stratification tests for predicting arrhythmic events in patients with nonischemic dilated cardiomyopathy.

May 19, 2026

Sudden Cardiac Death Risk Stratification in Patients With Nonischemic Dilated Cardiomyopathy

Key Result

Fragmented QRS and T-wave alternans were the strongest predictors of arrhythmic events in nonischemic dilated cardiomyopathy (OR 6.73, 95% CI 3.85-11.76 and OR 4.66, 95% CI 2.55-8.53).

Key Points

To evaluate and estimate the effectiveness of 12 risk stratification tests for predicting arrhythmic events in patients with nonischemic dilated cardiomyopathy.
Meta-analysis of 45 studies with 6,088 patients
Assessment of various predictive tests and their association with arrhythmic events
Use of mixed effects methodology and trim-and-fill method to address missing studies.
Test sensitivities ranged from 28.8% to 91.0% and specificities from 36.2% to 87.1%
Odds ratios were highest for fragmented QRS (6.73) and TWA (4.66), with confidence intervals indicating strong predictive ability
None of the autonomic tests were significant predictors of arrhythmic outcomes.

Study Design

Type

Meta-Analysis (n=6,088)

Structured PICO

Do various risk stratification tests predict arrhythmic events in patients with nonischemic dilated cardiomyopathy?

Population

6,088 patients with nonischemic dilated cardiomyopathy from 45 studies, mean age 52.8 ± 14.5 years, 77% male.

Intervention

12 risk stratification tests (baroreflex sensitivity, heart rate turbulence, heart rate variability, left ventricular end-diastolic dimension, left ventricular ejection fraction, electrophysiology study, nonsustained ventricular tachycardia, left bundle branch block, signal-averaged electrocardiogram, fragmented QRS, QRS-T angle, and T-wave alternans)

Outcome

Arrhythmic events (death due to ventricular tachyarrhythmias/sudden death)hard clinical

Individual risk stratification tests provide only modest predictive value for sudden cardiac death in nonischemic dilated cardiomyopathy, with fragmented QRS and T-wave alternans showing the strongest associations.

Main Result

Effect estimate: OR 6.73 (95% CI 3.85-11.76)

Limitations

Publication bias

Abstract

OBJECTIVES The purpose of this study was to provide a meta-analysis to estimate the performance of 12 commonly reported risk stratification tests as predictors of arrhythmic events in patients with nonischemic dilated cardiomyopathy. BACKGROUND Multiple techniques have been assessed as predictors of death due to ventricular tachyarrhythmias/sudden death in patients with nonischemic dilated cardiomyopathy. METHODS Forty-five studies enrolling 6,088 patients evaluating the association between arrhythmic events and predictive tests (baroreflex sensitivity, heart rate turbulence, heart rate variability, left ventricular end-diastolic dimension, left ventricular ejection fraction, electrophysiology study, nonsustained ventricular tachycardia, left bundle branch block, signal-averaged electrocardiogram, fragmented QRS, QRS-T angle, and T-wave alternans) were included. Raw event rates were extracted, and meta-analysis was performed using mixed effects methodology. We also used the trim-and-fill method to estimate the influence of missing studies on the results. RESULTS Patients were 52.8 ± 14.5 years of age, and 77% were male. Left ventricular ejection fraction was 30.6 ± 11.4%. Test sensitivities ranged from 28.8% to 91.0%, specificities from 36.2% to 87.1%, and odds ratios from 1.5 to 6.7. Odds ratio was highest for fragmented QRS and TWA (odds ratios: 6.73 and 4.66, 95% confidence intervals: 3.85 to 11.76 and 2.55 to 8.53, respectively) and lowest for QRS duration (odds ratio: 1.51, 95% confidence interval: 1.13 to 2.01). None of the autonomic tests (heart rate variability, heart rate turbulence, baroreflex sensitivity) were significant predictors of arrhythmic outcomes. Accounting for publication bias reduced the odds ratios for the various predictors but did not eliminate the predictive association. CONCLUSIONS Techniques incorporating functional parameters, depolarization abnormalities, repolarization abnormalities, and arrhythmic markers provide only modest risk stratification for sudden cardiac death in patients with nonischemic dilated cardiomyopathy. It is likely that combinations of tests will be required to optimize risk stratification in this population.

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Cite This Study

Goldberger et al. (Sat,) conducted a meta-analysis in nonischemic dilated cardiomyopathy (n=6,088). Risk stratification tests (e.g., fragmented QRS, T-wave alternans) was evaluated on arrhythmic events (OR 6.73, 95% CI 3.85-11.76). Fragmented QRS and T-wave alternans were the strongest predictors of arrhythmic events in nonischemic dilated cardiomyopathy (OR 6.73, 95% CI 3.85-11.76 and OR 4.66, 95% CI 2.55-8.53).

synapsesocial.com/papers/6a0c2b0caff5732a0d7306fa https://doi.org/https://doi.org/10.1016/j.jacc.2013.12.021

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