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Global Longitudinal Strain as a Potential Predictor of Sudden Cardiac Death in Hypertrophic CardiomyopathyHeart imaging helps identify high risk in cardiomyopathy patients

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Key Takeaway
Reduced global longitudinal strain identifies higher risk of sudden cardiac death in hypertrophic cardiomyopathy patients.

A meta-analysis involving 2,167 patients with hypertrophic cardiomyopathy (HCM) evaluated the prognostic value of global longitudinal strain (GLS). The study aimed to determine if GLS could serve as a reliable biomarker for identifying individuals at increased risk of sudden cardiac death (SCD) and fatal ventricular arrhythmias.

Results indicated that patients with reduced GLS values below 15% demonstrated a significantly higher risk of fatal arrhythmic events. However, the analysis found no significant correlation between a specific 1% worsening of GLS and an immediate increase in SCD or fatal arrhythmias, suggesting a threshold effect rather than a linear progression.

Overall, the combined meta-analysis confirmed a statistically significant association between low GLS and adverse outcomes. While these findings suggest that GLS may assist clinicians in identifying high-risk patients for ICD consideration, it should not be used as a standalone diagnostic tool. Clinical decisions must still integrate established risk factors to ensure accurate patient management.

How this fits prior evidence

This meta-analysis extends the understanding of imaging markers for hypertrophic cardiomyopathy. It builds upon evidence that specific echocardiographic markers are associated with mortality risk in children with hypertrophic cardiomyopathy and complements findings regarding the use of CMR imaging traits as potential therapeutic targets. While it provides a quantitative link between GLS and fatal arrhythmias, the observational nature of the data means it supplements rather than replaces established clinical risk factors.

Living with hypertrophic cardiomyopathy means managing a heart condition that can sometimes lead to dangerous, fast heartbeats or sudden cardiac events. Doctors are always looking for better ways to spot who is at the highest risk so they can provide the right care early.

A large review of data from over 2,000 patients looked at a specific measurement called global longitudinal strain (GLS). This test measures how well the heart muscle fibers contract and move. The results showed that patients with lower GLS scores had a significantly higher risk of fatal heart rhythms. However, the study did not find a direct link between small, 1% changes in these scores and immediate risks.

While this imaging tool could help doctors decide when to use devices like internal defibrillators, it is not a perfect standalone test. Because the data comes from observational studies, it shows a connection but does not prove that one thing causes another. Doctors recommend using these results alongside other established risk factors to make the best decisions for each patient.

What this means for you:
Lower heart muscle movement scores may help doctors identify higher-risk patients with hypertrophic cardiomyopathy.

Common questions

What is global longitudinal strain (GLS)?

Global longitudinal strain, or GLS, is an imaging measurement that looks at how well your heart muscle fibers contract and move. In this study of 2,167 patients, a lower score—specifically less than 15%—was linked to a significantly higher risk of fatal heart rhythms in those with hypertrophic cardiomyopathy.

Can this test be used alone to decide on treatment?

No, this measurement should not be used alone to make medical decisions. While it can help doctors identify higher-risk patients and assist in shared decision-making for cases that are borderline, it must be combined with other established risk factors to determine the best course of action.

Is this finding a proven cause of heart issues?

Because these results come from observational studies, they show a link between low muscle movement and higher risk, but they do not prove that one causes the other. More large-scale, standardized imaging studies are needed to fully confirm how much weight this specific measurement should carry.

Study Details

Study typeMeta analysis
Sample sizen = 2,167
EvidenceLevel 1
PublishedJul 2026
View Original Abstract ↓
BACKGROUND: Sudden cardiac death (SCD) remains a leading cause of mortality in patients with hypertrophic cardiomyopathy (HCM). Accurate identification of individuals at high risk is essential for guiding implantable cardioverter-defibrillator (ICD) therapy. Global longitudinal strain (GLS), an echocardiographic parameter derived from speckle-tracking imaging, reflects subclinical left ventricular systolic dysfunction and may serve as an adjunctive risk marker for fatal ventricular arrhythmias (VAs). METHODS: A systematic review and meta-analysis were conducted following PRISMA guidelines. PubMed and the Cochrane Library were searched from inception to April 2025 for studies assessing the association between GLS and SCD and/or fatal VAs in HCM. RESULTS: Out of 1050 identified records, seven studies comprising 2167 patients (mean age 54.7 years) met inclusion criteria. All included studies were of moderate-to-high quality (Newcastle-Ottawa Scale ≥6). In the pooled quantitative synthesis of three studies, patients with reduced GLS (<15%) had a significantly higher risk of fatal VAs [hazard ratio/odds ratio (HR/OR): 1.10, 95% (confidence interval) CI 1.04-1.17]. On the other hand, 1% worsening of GLS was not associated with SCD and/or fatal VAs (HR/OR: 1.09, 95% CI 0.89-1.33). A combined meta-analysis using data from seven studies showed a significant association between GLS and SCD and/or fatal VAs in patients with HCM (HR/OR: 1.10, 95% CI 1.03-1.18). CONCLUSIONS: GLS is associated with risk of fatal arrhythmic events in HCM and may help identify higher-risk patients, but evidence from observational studies does not prove causality and may be confounded. GLS could aid shared decision-making about ICDs in borderline cases when combined with established risk factors, but should not be used alone. Prospective multicenter studies with standardized imaging are needed to validate thresholds, confirm added prognostic value, and show impact on outcomes.
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