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In vitro study of the aortic interleaflet triangle reshaping.

R Vismara1, A M Leopaldi1, A Mangini2

  • 1Department of Electronic, Information and Bioengineering, Politecnico di Milano, via Golgi 39, Milan 20133, Italy; ForCardioLab, Fondazione per la Ricerca in Cardiochirurgia ONLUS, Milan, Italy.

Journal of Biomechanics
|December 24, 2013
PubMed
Summary
This summary is machine-generated.

Aortic interleaflet triangle reshaping (AITR) surgery for aortic valve incontinence is safe when performed conservatively. Mild variations in stitch placement (50-60%) showed minimal impact on aortic root hydrodynamics, suggesting a low risk of stenosis.

Keywords:
Aortic valveIn vitro testsInterleaflet triangle reshapingReparative surgery

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Area of Science:

  • Cardiovascular Surgery
  • Biomedical Engineering
  • Surgical Innovation

Background:

  • Aortic interleaflet triangle reshaping (AITR) is a surgical technique to address aortic valve incontinence.
  • The procedure involves precise stitch placement within the interleaflet triangles of the aortic valve.

Purpose of the Study:

  • To investigate the relationship between AITR stitch height and aortic valve function.
  • To determine the safety margin for stitch placement during AITR surgery.
  • To evaluate the hydrodynamic performance of the aortic root after AITR in vitro.

Main Methods:

  • AITR was performed on six swine aortic roots with stitches placed at 50%, 60%, and 75% of triangle heights.
  • Actual stitch heights were measured post-surgery.
  • Hydrodynamic performance was assessed using a pulsatile mock loop, measuring parameters like effective orifice area and pressure drop.

Main Results:

  • Actual stitch heights averaged 45±2%, 61±4%, and 79±6% for the intended placements.
  • The 50% configuration significantly altered the effective orifice area.
  • The 60% configuration led to a significant increase in systolic pressure drop compared to untreated controls, but not significantly different from the 50% group.
  • The 75% configuration significantly worsened all systolic hydrodynamic parameters.

Conclusions:

  • Conservative AITR (50-60% stitch height) did not significantly alter aortic root hydrodynamics in vitro.
  • More aggressive stitch placement (75%) negatively impacted valve function.
  • The minimal difference between 50% and 60% configurations suggests a limited risk of post-operative valve stenosis due to minor stitch misplacement.