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Comparative Study
Journal Article
Comparison of transprosthetic mean pressure gradients between Medtronic Hall and ATS valves in the aortic position.
International Journal of Cardiology 2005 March 11
AIM OF THE STUDY: Several studies have shown the inferior performance of small prostheses in the narrow aortic root. However, modern low-profile mechanical prostheses have improved hemodynamic performance characteristics. By measuring the transprosthetic pressure gradient in vivo, we were able to characterize the hemodynamic features of two prostheses: the ATS Medical (ATS) and the Medtronic Hall (MH) valves.
METHODS: From October 1994 to April 2002, 113 patients received an aortic valve replacement (AVR) with either an ATS or a MH valve. The transprosthetic pressure gradients, calculated from a simplified Bernoulli equation during immediate postoperative Doppler echocardiographic examination, were compared for differently sized prostheses with respect to body surface area (BSA).
RESULTS: The mean pressure gradients and the mean BSAs were: 27.8 +/- 14.8 mm Hg and 1.50 +/- 0.10 m(2) in ATS 19 mm (n = 7), 20.4 +/- 8.5 mm Hg and 1.54 +/- 0.11 m(2) in ATS 21 mm (n = 22), 13.0 +/- 5.7 mm Hg, 1.70 +/- 0.13 m(2) in ATS 23 mm (n = 22), 10.9 +/- 3.5 mm Hg and 1.81 +/ -0.16 m(2) in ATS 25 mm (n = 19), 9.3 +/- 0.6 mm Hg and 1.72 +/- 0.17 m(2) in ATS 27 mm (n = 4), 13.5 +/- 6.5 mm Hg and 1.54 +/- 0.13 m(2) in MH 20 mm (n = 9), 10.9 +/- 4.7 mm Hg and 1.64 +/- 0.15 m(2) in MH 22 mm (n = 22), 9.3 +/- 3.1 mm Hg and 1.72 +/- 0.12 m(2) in MH 24 mm (n = 7).
CONCLUSIONS: With the exception of the ATS 19-mm valve, the variously sized prostheses have acceptable transprosthetic pressure gradient measurements. In addition, even-sized MH valves (20 and 22 mm) with a thinner sewing cuff showed better hemodynamic performances than similarly sized ATS valves.
METHODS: From October 1994 to April 2002, 113 patients received an aortic valve replacement (AVR) with either an ATS or a MH valve. The transprosthetic pressure gradients, calculated from a simplified Bernoulli equation during immediate postoperative Doppler echocardiographic examination, were compared for differently sized prostheses with respect to body surface area (BSA).
RESULTS: The mean pressure gradients and the mean BSAs were: 27.8 +/- 14.8 mm Hg and 1.50 +/- 0.10 m(2) in ATS 19 mm (n = 7), 20.4 +/- 8.5 mm Hg and 1.54 +/- 0.11 m(2) in ATS 21 mm (n = 22), 13.0 +/- 5.7 mm Hg, 1.70 +/- 0.13 m(2) in ATS 23 mm (n = 22), 10.9 +/- 3.5 mm Hg and 1.81 +/ -0.16 m(2) in ATS 25 mm (n = 19), 9.3 +/- 0.6 mm Hg and 1.72 +/- 0.17 m(2) in ATS 27 mm (n = 4), 13.5 +/- 6.5 mm Hg and 1.54 +/- 0.13 m(2) in MH 20 mm (n = 9), 10.9 +/- 4.7 mm Hg and 1.64 +/- 0.15 m(2) in MH 22 mm (n = 22), 9.3 +/- 3.1 mm Hg and 1.72 +/- 0.12 m(2) in MH 24 mm (n = 7).
CONCLUSIONS: With the exception of the ATS 19-mm valve, the variously sized prostheses have acceptable transprosthetic pressure gradient measurements. In addition, even-sized MH valves (20 and 22 mm) with a thinner sewing cuff showed better hemodynamic performances than similarly sized ATS valves.
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