January 22, 2026

Single-Beat Method Echocardiographic Comparison of Ventricular Arterial Coupling in Adults with and without Down syndrome

Q: What does this research mean for the field?

Adults with Down syndrome have a lower ventricular-arterial coupling ratio, indicating distinct cardiovascular adaptations compared to those without Down syndrome. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.NEUTRAL.

Key Result

Adults with Down syndrome had a lower ventricular-arterial coupling ratio, indicating distinct cardiovascular adaptations compared to those without Down syndrome.

Key Points

To compare ventricular-arterial coupling in adults with and without Down syndrome using echocardiographic measures.
Collected baseline echocardiographic data from 28 adults with Down syndrome and 18 without
Utilized the single-beat method to calculate the ventricular-arterial coupling ratio
Focused on participants aged 18-35 years with low physical activity levels
Adults with Down syndrome had lower ventricular arterial coupling ratios
Exhibited lower diastolic blood pressure and faster pre-ejection times
Showed shorter normalized systolic durations and a higher ejection fraction

Structured PICO

Does ventricular-arterial coupling (VAC) and other echocardiographic parameters differ between adults with and without Down syndrome?

Population

46 adults (aged 18-35 years) with low physical activity levels, comprising 28 adults with Down syndrome and 18 adults without Down syndrome.

Intervention

Presence of Down syndrome (observational exposure)

Comparator

Adults without Down syndrome

Outcome

Ventricular-arterial coupling (VAC) ratio calculated using the single-beat methodsurrogate

Adults with Down syndrome exhibit distinct cardiovascular adaptations, including lower VAC ratios and shorter systolic durations, suggesting increased cardiac workload and compensatory mechanisms to maintain cardiac output.

Main Result

Absolute Event Rate: 0% vs 0%

Abstract

Adults with Down syndrome (Ds) demonstrate unique cardiovascular features, including smaller left ventricular volumes and lower blood pressure. Ventricular-arterial coupling (VAC), a key measure of cardiovascular efficiency, has not been previously studied in this adult population. Understanding VAC in adults with Ds may reveal compensatory mechanisms that maintain cardiac output despite distinct cardiovascular characteristics. This study used echocardiographic parameters to compare the VAC ratio of adults with and without Ds. Baseline echocardiographic data were collected from 28 adults with Ds and 18 adults without Ds (aged 18 – 35 years), all of whom had low physical activity levels. The VAC ratio was calculated using the single-beat method. Adults with Ds had lower VAC ratios and diastolic blood pressure, faster pre-ejection times, shorter normalized systolic durations, and a higher ejection fraction than adults without Ds. Adults with Ds exhibit distinct cardiovascular adaptations, including a lower VAC ratio and a shorter systolic duration, suggesting increased cardiac workload. Higher ejection fraction and faster pre-ejection period indicate potential compensatory mechanisms to maintain cardiac output, while lower diastolic blood pressure may reduce coronary perfusion and preload. These findings demonstrate differences in cardiac function and timing in adults with Ds in this study.

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