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Noninvasive Determination of Vortex Formation Time Using Transesophageal Echocardiography During Cardiac Surgery

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Preoperative loop length determination for mitral valve repair by 4-dimensional computed tomography.

Kazumasa Tsuda¹, Naoki Washiyama¹, Masahiro Hirano¹

¹First Department of Surgery, Hamamatsu University School of Medicine, Hamamatsu, Japan.

JTCVS Techniques

|December 13, 2024

Summary

Preoperative 4D CT accurately predicts loop length for mitral valve repair, improving the loop technique. This enhances procedural efficiency and reproducibility for successful outcomes.

Keywords:

4-dimensional computed tomography loop technique mitral valve repair papillary muscle

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Area of Science:

Cardiovascular Surgery
Medical Imaging
Cardiac Valve Repair

Background:

The loop technique for mitral valve repair traditionally involves intraoperative chordal length measurements during cardiac arrest, which can be time-consuming and lack reproducibility.
This often leads to challenges in achieving optimal loop bundle length, potentially impacting repair success.

Purpose of the Study:

To determine the optimal loop length preoperatively using 4-dimensional computed tomography (4D CT) for mitral valve repair.
To enhance the accuracy and reproducibility of the loop technique in mitral valve repair.

Main Methods:

Loop length was preoperatively determined using 4D CT by measuring the distance from the papillary muscle head to the free margin of the nonprolapsing leaflet.
Measurements were performed on commissural and long-axis views in the late systolic phase.
The technique was applied to 45 consecutive patients undergoing mitral valve repair with the loop technique.

Main Results:

A total of 55 loop bundles were created in 45 patients, with loop lengths ranging from 16 to 26 mm (median 19 mm).
Mitral valve repair was successfully completed in all patients, with predetermined loop lengths used successfully in 93.3% of cases.
Postoperative echocardiography showed none/trace regurgitation in 41 patients and mild regurgitation in 4, with no hospital mortality or major complications.

Conclusions:

Preoperative 4D CT measurements provide an accurate and reproducible method for predicting the required loop length in mitral valve repair.
This approach can streamline the loop technique, potentially improving surgical outcomes and patient recovery.