In:
Asian Cardiovascular and Thoracic Annals, SAGE Publications, Vol. 11, No. 3 ( 2003-09), p. 193-197
Abstract:
Doppler echocardiographic characteristics of 29 normally functioning prosthetic valves (23 mechanical, 6 biological) and 8 obstructed mechanical prostheses in the tricuspid position are reported. In normally functioning prostheses, peak velocity, mean pressure gradient, and pressure-half time were 1.25 ± 0.18 m·sec −1 , 2.6 ± 1.1 mm Hg, and 122.6 ± 30.7 msec, respectively. Although no significant differences were seen in peak velocity and mean pressure gradient between mechanical and biological valves, the pressure half-time was significantly greater in biological valves. All normally functioning prostheses had a mean pressure gradient ⩽5.5 mm Hg and pressure half-time 〈 200 msec. In obstructed bileaflet valves, peak velocity was 1.66 ± 0.28 m·sec −1 , mean pressure gradient was 6.1 ± 2.8 mm Hg, and pressure half-time was 265.8 ± 171.7 msec. These Doppler data were significantly greater than those in normally functioning valves where the mean pressure gradient was ⩽5.1 mm Hg and the pressure half-time was ⩽156 msec in all except one patient. Pathological obstruction of a tricuspid prosthesis can be strongly suspected in patients with a mean pressure gradient 〉 5.5 mm Hg and a pressure half-time 〉 200 msec on Doppler echocardiography.
Type of Medium:
Online Resource
ISSN:
0218-4923
,
1816-5370
DOI:
10.1177/021849230301100302
Language:
English
Publisher:
SAGE Publications
Publication Date:
2003
detail.hit.zdb_id:
2044527-1
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