Key result
Bileaflet mechanical valve prostheses produced high intensity transient signals at rates of 32 to 108 counts/h, whereas tilting disc valves produced only 0.2 counts/h.
Why the study?
Does bileaflet mechanical valve design compared to tilting disc design increase the incidence of high intensity transient signals (HITS) in patients with mechanical aortic valve substitutes?
Population
30 patients at least 9 months postoperative from mechanical aortic valve replacement.
Comparison
Bileaflet mechanical valve substitutes vs Tilting disc mechanical valve substitute
Design
Cross-sectional
Follow-up
at least 9 months postoperative
Authors
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Bileaflet valves linked to far higher HITS rates than tilting-disc valves; leaves open clinical relevance and need for outcome studies.
Observational (n=30)
Does bileaflet mechanical valve design compared to tilting disc design increase the incidence of high intensity transient signals (HITS) in patients with mechanical aortic valve substitutes?
Bileaflet mechanical aortic valves produce significantly more high intensity transient signals than tilting disc valves, which can be reduced by oxygen breathing or aspirin.
Joachim Laas (2002) conducted an observational in Mechanical aortic valve replacement (n=30). Bileaflet mechanical valve vs. Tilting disc mechanical valve was evaluated on Incidence of high intensity transient signals (HITS). Bileaflet mechanical valve prostheses produced high intensity transient signals at rates of 32 to 108 counts/h, whereas tilting disc valves produced only 0.2 counts/h.
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