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Mihara et al: Effects of mitral valve repair on valvular geometry and hemodynamics in dogs with myxomatous mitral valve disease
Veterinary Surgery 3, 2024

🔍 Key Findings

  • Mitral valve plasty (MVP) in dogs with MMVD significantly reduced regurgitant volume and fraction, and normalized LA:Ao ratio, indicating reversal of volume overload.
  • MVP altered mitral valve geometry, with reduced annular dimensions and increased coaptation length, enhancing valve competence.
  • Postoperative LA:Ao ratio dropped from 2.2 to 1.2, consistent with improved left atrial pressure and size.
  • Forward stroke volume index and cardiac index increased at 3 months, reflecting improved hemodynamic function despite reduced fractional shortening.
  • Three dogs (3.9%) died postoperatively, highlighting a 96.1% survival rate within 3 months.
  • The repair technique involved artificial chordal replacement and annuloplasty; no cleft closure or leaflet suturing was used.
  • Color Doppler echocardiography confirmed substantial reduction in mitral regurgitation postoperatively in most dogs.

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← Articles

Mihara et al: Effects of mitral valve repair on valvular geometry and hemodynamics in dogs with myxomatous mitral valve disease
Veterinary Surgery 3, 2024

🔍 Key Findings

  • Mitral valve plasty (MVP) in dogs with MMVD significantly reduced regurgitant volume and fraction, and normalized LA:Ao ratio, indicating reversal of volume overload.
  • MVP altered mitral valve geometry, with reduced annular dimensions and increased coaptation length, enhancing valve competence.
  • Postoperative LA:Ao ratio dropped from 2.2 to 1.2, consistent with improved left atrial pressure and size.
  • Forward stroke volume index and cardiac index increased at 3 months, reflecting improved hemodynamic function despite reduced fractional shortening.
  • Three dogs (3.9%) died postoperatively, highlighting a 96.1% survival rate within 3 months.
  • The repair technique involved artificial chordal replacement and annuloplasty; no cleft closure or leaflet suturing was used.
  • Color Doppler echocardiography confirmed substantial reduction in mitral regurgitation postoperatively in most dogs.

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Multiple Choice Questions on this study

In Mihara 2024 et al., on mitral valve repair in dogs, what geometric change supported improved valve competence?

A. Annular dilation
B. Leaflet tethering
C. Coaptation length increase
D. Tenting height increase
E. Mitral orifice widening

Answer: Coaptation length increase

Explanation: Postoperative CL increased significantly, restoring mitral competence.
In Mihara 2024 et al., on mitral valve repair in dogs, what was the reported 3-month survival rate?

A. 88.2%
B. 100%
C. 96.1%
D. 91.3%
E. 85.5%

Answer: 96.1%

Explanation: Three dogs died, leading to a survival rate of 96.1%.
In Mihara 2024 et al., on mitral valve repair in dogs, what postoperative change supported improved forward flow?

A. Reduced fractional shortening
B. Increased regurgitant volume
C. Stable ejection fraction
D. Increased stroke volume index
E. Decreased cardiac index

Answer: Increased stroke volume index

Explanation: Forward stroke volume index significantly increased from 1.5 to 2.3 mL/kg.
In Mihara 2024 et al., on mitral valve repair in dogs, which technique was used during MVP?

A. Leaflet suturing
B. Commissurotomy
C. Artificial chordae and annuloplasty
D. Cleft closure only
E. Papillary muscle resection

Answer: Artificial chordae and annuloplasty

Explanation: Cleft closure and leaflet suturing were not used; artificial chordae and annuloplasty were.
In Mihara 2024 et al., on mitral valve repair in dogs, what was the postoperative change in the LA:Ao ratio?

A. Decreased from 2.2 to 1.2
B. Increased from 1.2 to 2.2
C. No change from baseline
D. Fluctuated unpredictably
E. Remained >2.5

Answer: Decreased from 2.2 to 1.2

Explanation: The LA:Ao ratio significantly dropped post-op, indicating reduced volume overload.

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