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Indexed/Abstracted in: BIOSIS Previews, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
Impact Factor 1,632
Online ISSN 1827-191X
Hurlè A., Wangüemert F. *, Feijóo J. J., Medina A. *
From the Department of Cardiovascular Surgery
*Cardiology Hospital N. S. del Pino, Las Palmas de Gran Canaria Canary Islands, Spain
Background. Analyzing the hemodynamics of small-sized tilting-disc mechanical prostheses implanted in the mitral position.
Methods. Experimental design: this is a retrospective study. The mean follow-up of patients was 114±27 months (range 68-152 months). Setting: departments of Cardiovascular Surgery and Cardiology in a general community hospital. Patients: this study includes 9 survivors of 17 patients undergoing mitral valve replacement with this type of device between May, 1982 and July, 1991. Interventions: all subjects underwent mitral valve replacement with size 25 mm Sorin tilting-disc mechanical prostheses. Measures: all patients underwent transthoracic echocardiography. Five consenting patients also underwent transoesophageal echocardiography. The following parameters were measured: peak gradient, mean gradient, peak velocity, mean velocity, pressure half-time and Doppler area.
Results. The ejection fraction was 50% or more in all patients. The following mean results were obtained: peak gradient: 17.4±2.5 mmHg; mean gradient: 8.2±0.6 mmHg; peak velocity: 2.1±0.1 m/sec; mean velocity: 1.43±0.06 m/sec; pressure half-time: 135.9±29.7 msec; Doppler area: 1.7±0.3 cm2.
Conclusions. Valve replacement with Sorin 25 mm tilting-disc mechanical prostheses appears to originate a moderate degree of mitral stenosis and, therefore, we do not recommend their use if at all possible.