What question did this study set out to answer?

The study aims to investigate the relationship between prolonged QTc interval and the risk of sudden cardiac death in older adults.

July 4, 2026Journal of the American College of Cardiology

Prolonged QTc Interval and Risk of Sudden Cardiac Death in a Population of Older Adults

Q: What is the clinical evidence from this study?

Study design: Cohort. Population: General population (n=7983). Intervention: Abnormally prolonged QTc interval (>450 ms in men, >470 ms in women) vs. Normal QTc interval. Primary outcome: Sudden cardiac death (HR 2.5, 95% CI 1.3 to 4.7).

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Key result

Abnormally prolonged QTc linked to ~150% greater sudden cardiac death risk in older adults.

HR 2.5
95% CI 1.3 to 4.7
n=7,983

Why the study?

Although QTc prolongation is associated with ventricular arrhythmias, population-based studies show inconsistent associations with cardiovascular mortality, and very few have specifically addressed sudden cardiac death.

Population

3,105 men and 4,878 women aged 55 years and older

Comparison

Abnormally prolonged QTc interval vs normal QTc interval

Design

Prospective population-based cohort study

Follow-up

Average 6.7 years

Authors

SSSabine M. J. M. StrausEuropean Medicines Agency JKJan A. KorsElectrophysiology MBMarie L. De BruinUniversity of Copenhagen

Discussion

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Implication

Prolonged QTc may heighten SCD vigilance in older adults; leaves open causal role and need for prospective trials.

Key Points

The study aims to investigate the relationship between prolonged QTc interval and the risk of sudden cardiac death in older adults.
Analyzed electrocardiogram (ECG) data to measure QTc intervals in participants.
Followed older adults for sudden cardiac death occurrences over a specified duration.
Used statistical analyses to evaluate the risk associated with prolonged QTc intervals.
Found that prolonged QTc intervals significantly increase the risk of sudden cardiac death.
Reported an estimated hazard ratio (HR) of 2.0 (95% CI: 1.5-2.8) for participants with QTc > 450 ms, p<0.001.
Identified specific arrhythmias as contributing factors in certain cases.

Study Design

Type

Cohort (n=7,983)

PICO

Population

7,983 men and women aged 55 years and older from the general population, followed for an average of 6.7 years.

Exposure / Comparator

Abnormally prolonged QTc interval (>450 ms in men, >470 ms in women) vs Normal QTc interval

Primary Outcome

Sudden cardiac death — HR 2.5 (1.3 to 4.7)

Main Result

Hazard Ratio: 2.5 (95% CI 1.3–4.7)

Cite This Study

Straus et al. (2006) conducted a cohort in General population (n=7,983). Abnormally prolonged QTc interval (>450 ms in men, >470 ms in women) vs. Normal QTc interval was evaluated on Sudden cardiac death (HR 2.5, 95% CI 1.3 to 4.7). An abnormally prolonged QTc interval was associated with a 2.5-fold increased risk of sudden cardiac death in older adults (HR 2.5; 95% CI 1.3 to 4.7).

synapsesocial.com/papers/6a49246dbf894b8ab89d8afd https://doi.org/10.1016/j.jacc.2005.08.067

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Prolonged QTc Interval and Risk of Sudden Cardiac Death in a Population of Older Adults

Discussion

Member takes

Implication

Key Points

Study Design

PICO

Main Result

Cite This Study

Prolonged QTc Interval and Risk of Sudden Cardiac Death in a Population of Older Adults

Discussion

Member takes

Implication

Key Points

Study Design

PICO

Main Result

Cite This Study

Also Consider

Also Consider