Ventriculo-arterial coupling parameters by cardiac magnetic imaging are associated with outcome in patients with a systemic right ventricle
Abstract
Invasive studies have shown that patients with a systemic right ventricle (sRV) due to congenitally corrected transposition of the great arteries (TGA) or complete TGA after atrial switch procedure possess impaired ventriculo-arterial coupling (VAC) parameters. The randomized, placebo-controlled, double-blinded, multi-centre SERVE trial investigated the effect of phosphodiesterase-5 inhibitor tadalafil in sRV patients on RV endsystolic volume (RVESV), with negative results. Aim of this sub-analysis was to evaluate changes of non-invasively assessed VAC parameters over time and for treatment effect. We prospectively analysed whether VAC parameters predict clinical outcome in sRV patients.
Volumetric RV parameters and aortic flow were assessed by cardiac magnetic resonance (CMR) and analysed (blinded for patient and assessment time and treatment) at baseline, after 3 years, or after 1 year if the study drug was withdrawed. Parameters were compared with clinical outcome at each visit. Effective arterial elastance Ea was calculated as RV endsystolic pressure (RVesp) / aortic forward flow, with RVesp defined as 0.9 x systolic blood pressure. Right ventricular endsystolic elastance Ees was calculated by RVesp / RVESV, and RV VA-coupling ratio was expressed as Ea/Ees. Treatment effect was analysed using ANCOVA with baseline values and FU-time as covariates. Values of > 4th quartile were used as cut-off for Kaplan-Meier analysis on the primary outcome, defined as a composite of…
How strong is the evidence?
Evidence Hub reads this as a randomized trial, done in people. Its evidence level is 2 of 5 (High · randomized trial). Randomized trials of a reasonable size are the strongest single-study design. Reported size: 78 participants or records.
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