ISSN : 1301-5680
e-ISSN : 2149-8156
Turkish Journal of Thoracic and Cardiovascular Surgery     
Comparison of the hemodynamic performances of Carbomedics® and On-X® bileaflet mechanical heart valves in mitral position
İlker Kiriş1, Hüseyin Okutan 1, Oktay Peker 1, Turhan Yavuz 1, Ahmet Öcal 1, Erdoğan İbrişim 1, Ali Kutsal2
1Süleyman Demirel Üniversitesi, Şevket Demirel Kalp Merkezi, Kalp ve Damar Cerrahisi Kliniği, Isparta
2Sami Ulus Çocuk Hastanesi, Pediatrik Kalp Cerrahisi Kliniği, Ankara
Background: The aim of the current study was to compare hemodynamic performances of the Carbomedics® and On- X® mechanical bileaflet heart valves in the early postoperative period in patients undergoing mitral valve replacement (MVR).

Methods: Thirty patients who underwent MVR operations were randomly divided into two groups. Carbomedics® and On-X® mechanical bileaflet mitral valves were implanted in the first group (n=15) and the second group (n=15) of patients, respectively. Hemodynamic measurements were done by echocardiography in the preoperative period and three months after the operation.

Results: There were no statistically significant differences between the two groups regarding pre- and postoperative changes that occured in left ventricular end diastolic diameter, left ventricular end sistolic diameter, left atrium diameter, pulmonary artery pressure, ejection fraction and fractional shortening (p>0.05). However, performance index in the Carbomedics® group was higher than that in the On-X® group (0.96±0.15 vs 0.73±0.10) and the difference was statistically significant (p<0.05). Transvalvular peak pressure gradient in the Carbomedics® group was higher than that in the On-X® group (14.20±3.14 vs 11.07±2.89) and the difference was also statistically significant (p<0.05). There was no statistically significant difference for effective orifice area and transvalvular mean pressure gradient between the two groups postoperatively (p>0.05).

Conclusions: When echocardiographic data of the On-X® and Carbomedics® mitral mechanical heart valves were compared in the early postoperative period, similar hemodynamic performances were found. We propose that the On-X® heart valve, which has been introduced into clinical use more recently than Carbomedics®, can be used safely in MVR operations.

Keywords : Heart valve diseases/surgery; heart valve prosthesis implantation
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