What does this research mean for the field?

Transcatheter aortic valve implantation for severe aortic stenosis acutely reduces afterload, improves ventriculo-arterial coupling, and decreases myocardial metabolic demand in both the left and right ventricles. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

This study aims to quantify the acute changes in bi-ventricular haemodynamics following transcatheter aortic valve implantation for severe aortic stenosis.

May 25, 2026Open Access

Acute bi-ventricular haemodynamic changes after transcatheter aortic valve implantation for severe aortic stenosis assessed using invasive pressure-volume loops

Q: What is the clinical evidence from this study?

Study design: Observational. Population: Severe symptomatic aortic stenosis (n=12). Intervention: Transcatheter aortic valve implantation (TAVI) vs. Pre-TAVI baseline. Primary outcome: Left ventricular effective arterial elastance (Ea) (p=<0.001).

Key Result

Transcatheter aortic valve implantation significantly reduced left ventricular effective arterial elastance from 2.1 to 1.4 mmHg/mL and improved bi-ventricular ventriculo-arterial coupling.

Key Points

This study aims to quantify the acute changes in bi-ventricular haemodynamics following transcatheter aortic valve implantation for severe aortic stenosis.
Invasive pressure-volume loops assessed in 12 patients pre- and post-TAVI.
Indices of contractile function and energetics derived from pressure-volume data.
Significant reductions in left ventricular (LV) effective arterial elastance from 2.1 to 1.4 mmHg/mL (p < 0.001) and right ventricular (RV) elastance from 0.5 to 0.4 mmHg/mL (p = 0.006).
Acute decline in LV contractility measured by end-systolic elastance (p = 0.021) with improved ventriculo-arterial coupling for both ventricles (p = 0.003 for LV, p = 0.006 for RV).
Notable reductions in LV stroke work from 11,915.0 to 7,360.5 mmHg/mL (p < 0.001) and RV stroke work from 1,506.9 to 1,418.1 mmHg/mL (p = 0.020).

Study Design

Type

Observational (n=12)

Multicenter

Structured PICO

Does transcatheter aortic valve implantation improve acute bi-ventricular haemodynamics in patients with severe symptomatic aortic stenosis?

Population

12 patients with severe symptomatic aortic stenosis, median age 84.1 years (IQR 77.1-87.2), 25% female.

Intervention

Transcatheter aortic valve implantation (TAVI)

Comparator

Pre-TAVI baseline (within-patient comparison)

Outcome

Acute bi-ventricular haemodynamic changes (contractile function, ventriculo-arterial coupling, and energetics) measured by invasive pressure-volume loops immediately post-TAVIsurrogate

TAVI for severe aortic stenosis provides immediate bi-ventricular unloading, improves ventriculo-arterial coupling, and reduces myocardial metabolic demand.

Main Result

Absolute Event Rate: 1.4% vs 2.1%

p-value: p=<0.001

Limitations

Small, exploratory, single-centre study limiting generalisability.
Impact of the observed haemodynamic changes on clinical outcomes was not ascertained.
Potential influence of subtle intra-procedural variations in conscious sedation level, blood viscosity, catheter position, AS severity, valve type/size or rapid ventricular pacing.
Single-beat estimation of ESPVR assumed a fixed volume-axis intercept (V0) at zero.

Abstract

Transcatheter aortic valve implantation (TAVI) aims to relieve the increased left ventricular (LV) afterload imposed by aortic stenosis (AS). However, the early haemodynamic impact of TAVI on bi-ventricular performance remains poorly characterised. This prospective study quantified the acute bi-ventricular response following TAVI for severe symptomatic AS using gold-standard invasive pressure-volume loop (PVL) assessment. Left and right ventricular (RV) PVLs were recorded using a conductance catheter pre- and immediately post-TAVI. Indices of contractile function, ventriculo-arterial coupling and energetics were derived. In total, 12 patients (84.1 years interquartile range: 77.1, 87.2; female 25%) were included. TAVI resulted in significant bi-ventricular reductions in afterload, measured by effective arterial elastance (LV: 2.1 1.8, 2.3 to 1.4 1.3, 1.7 mmHg/mL, p < 0.001; RV: 0.5 0.4, 0.6 to 0.4 0.3, 0.4 mmHg/mL, p = 0.006). Despite an acute decline in LV contractility, measured by end-systolic elastance ( p = 0.021), there was a significant net improvement in ventriculo-arterial coupling in both the LV ( p = 0.003) and RV ( p = 0.006). Both the LV and RV demonstrated significant reductions in stroke work (SW) (LV-SW: 11,915.0 9,727.5, 15,288.7 to 7,360.5 6,937.0, 9,113.1 mmHg/mL, p < 0.001; RV-SW: 1,506.9 1,420.5, 1,676.2 to 1,418.1 1,250.8, 1,510.3 mmHg/mL, p = 0.020) and pressure volume area (PVA) (LV-PVA: 16,188.5 13,171.5, 18,726.5 to 9,674.2 9,185.9, 11,872.2 mmHg/mL, p < 0.001; RV-PVA 2,176.1 2,046.3, 2,885.1 to 1,960.2 1,835.6, 2,269.0 mmHg/mL, p = 0.002), with stable SW/PVA ratios. The acute haemodynamic effects of TAVI for severe symptomatic AS extend beyond the LV. Patients experienced bi-ventricular unloading, improved ventriculo-arterial coupling and reduced myocardial metabolic demand. Schematic illustration of changes in bi-ventricular pressure-volume loops following TAVI, representing cohort-averaged data rather than direct measurements, together with the key study findings. EDP: end-diastolic pressure; EDPVR: end-diastolic pressure-volume relationship; ESP: end-systolic pressure; ESPVR: end-systolic pressure-volume relationship; LV: left ventricle; RV-PA: right ventricle-pulmonary arterial; SW: stroke work; TAVI: transcatheter aortic valve implantation.

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