What is the clinical evidence from this study?

Study design: Case Report. Population: Severe symptomatic mitral stenosis and biventricular failure (n=1). Intervention: ECMO-supported valve-in-valve transcatheter mitral valve replacement with balloon-assisted translocation of the anterior mitral leaflet.

What does this research mean for the field?

Balloon-assisted translocation of the anterior mitral leaflet modification combined with mechanical circulatory support is feasible for preventing left ventricular outflow tract obstruction during high-risk transcatheter mitral valve replacement. Novelty: ClaimNovelty.METHODOLOGICAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To describe a procedural strategy for avoiding left ventricular outflow tract obstruction during valve-in-valve transcatheter mitral valve replacement in a patient with small neo-LVOT and prohibitive reoperative risk.

September 19, 2026JACC Case ReportsOpen Access

Prevention of Left Ventricular Outflow Tract Obstruction During High-Risk Transcatheter Mitral Valve Replacement

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Key result

ECMO-supported TMVR with balloon-assisted leaflet translocation successfully prevents LVOT obstruction in a high-risk patient.

Key Points

To describe a procedural strategy for avoiding left ventricular outflow tract obstruction during valve-in-valve transcatheter mitral valve replacement in a patient with small neo-LVOT and prohibitive reoperative risk.
Evaluated a 74-year-old woman presenting with severe mitral stenosis and biventricular failure due to a degenerated 27-mm surgical bioprosthesis.
Initiated venoarterial extracorporeal membrane oxygenation support for hemodynamic stability during the intervention.
Performed balloon-assisted translocation of the anterior mitral leaflet modification and deployed a 26-mm balloon-expandable valve using a left ventricular pacing guidewire and 13-F steerable sheath.
Successfully accomplished transcatheter valve-in-valve deployment without causing acute left ventricular outflow tract obstruction.
Achieved stable valve delivery and rapid pacing through a left ventricular pacing guidewire while avoiding right ventricular instrumentation.
Navigated the calcified bioprosthetic leaflet in a controlled manner using the steerable sheath under mechanical circulatory support.

Study Design

Type

Case Report (n=1)

Structured PICO

Population

A 74-year-old woman with a degenerated surgical mitral bioprosthesis, severe mitral stenosis, and biventricular failure at high risk for redo surgery.

Intervention

Extracorporeal membrane oxygenation-supported valve-in-valve transcatheter mitral valve replacement with balloon-assisted translocation of the anterior mitral leaflet modification and intraleaflet deployment of a 26-mm balloon-expandable valve using a left ventricular pacing guidewire and 13-F steerable sheath.

Outcome

Feasibility of preventing left ventricular outflow tract (LVOT) obstruction

Balloon-assisted translocation of the anterior mitral leaflet with ECMO support is a feasible technique to prevent LVOT obstruction during high-risk transcatheter mitral valve-in-valve replacement.

Discussion

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Implication

Demonstrates procedural feasibility in prohibitive-risk TMVR; hypothesis-generating and requires prospective validation before wider use.

Cite This Study

Bashir et al. (2026) conducted a case report in Severe symptomatic mitral stenosis and biventricular failure (n=1). ECMO-supported valve-in-valve transcatheter mitral valve replacement with balloon-assisted translocation of the anterior mitral leaflet was evaluated. ECMO-supported transcatheter mitral valve replacement with balloon-assisted leaflet translocation was successfully performed in a high-risk patient to prevent LVOT obstruction.

synapsesocial.com/papers/6aae47640c69660b71ecc667 https://doi.org/10.1016/j.jaccas.2026.110266

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Prevention of Left Ventricular Outflow Tract Obstruction During High-Risk Transcatheter Mitral Valve Replacement

Key Points

Study Design

Structured PICO

Discussion

Implication

Cite This Study

Prevention of Left Ventricular Outflow Tract Obstruction During High-Risk Transcatheter Mitral Valve Replacement

Key Points

Study Design

Structured PICO

Discussion

Implication

Cite This Study

Also Consider

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