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Related Experiment Videos

Prosthetic valves for the small aortic root

H B Barner1, A J Labovitz, A C Fiore

  • 1Division of Cardiothoracic Surgery, Washington University, Christian Hospital, St. Louis, Missouri.

Journal of Cardiac Surgery
|March 1, 1994
PubMed
Summary
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Mechanical aortic valves implanted in small aortic roots show varying hemodynamic performance. Smaller valves are linked to reduced cardiac output and worse heart failure outcomes compared to larger ones.

Area of Science:

  • Cardiovascular Surgery
  • Biomedical Engineering
  • Clinical Hemodynamics

Background:

  • Mechanical aortic valves (AVs) are often used in small aortic roots (19-21 mm) due to high gradients with bioprosthetic valves and limited allograft options.
  • Starr-Edwards (SE), St. Jude Medical (SJ), and Medtronic-Hall (MH) are common mechanical AVs in the US.

Purpose of the Study:

  • To compare the hemodynamic performance and clinical outcomes of small mechanical aortic valves (SE, SJ, MH) versus larger valves.
  • To identify predictors of congestive heart failure (CHF) class after aortic valve replacement.

Main Methods:

  • Hemodynamic data (gradients, effective orifice) were collected for specific sizes of SE, SJ, and MH mechanical AVs.
  • Clinical outcomes including cardiac output, left ventricular mass index (LVMI) reduction, exercise duration, and CHF class were assessed six months post-AV replacement.

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Main Results:

  • The 21-mm SE valve showed peak systolic gradients of 13-58 mmHg. The 19-mm SJ valve exhibited peak gradients of 17 mmHg (rest) and 32-38 mmHg (exercise). The 21-mm SJ and MH valves had lower resting gradients.
  • Patients receiving small AVs (SJ/MH, <23 mm) had significantly lower cardiac output (4.7 vs 6.4 L/min), less LVMI reduction (-8% vs -21%), shorter exercise duration (370 vs 555 s), and higher CHF class (1.9 vs 1.1) compared to those with larger valves.
  • Change in LVMI and valve size were the sole independent predictors of CHF class.

Conclusions:

  • Smaller mechanical aortic valves, particularly the SJ and MH types, demonstrate less favorable hemodynamic profiles and are associated with poorer clinical outcomes, including increased risk of heart failure.
  • Valve size is a critical factor influencing long-term outcomes after aortic valve replacement, highlighting the importance of selecting appropriately sized prostheses.