Why the study?
What are the optimal echocardiographic techniques for evaluating the Bjork-Shiley prosthetic valve?
What are the optimal echocardiographic techniques for evaluating the Bjork-Shiley prosthetic valve?
Optimal echocardiographic evaluation of the Bjork-Shiley valve requires aligning the ultrasound beam perpendicular to the maximally opened disc, which can be facilitated by surgical rotation of the inner valve annulus.
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Echocardiographers may individualize beam angle for Bjork-Shiley disc assessment; leaves open standardized protocols pending clinical validation.
The in vitro and in vivo echocardiographic characteristics of the Bjork-Shiley tilting disc prosthetic valve are described. Optimal position of transducer and valve for detecting maximal disc excursion occurs when the ultrasound beam is perpendicular to the maximally opened disc. This alignment may vary from patient to patient requiring individualization by the echocardiographer. Rotation of the inner valve annulus at the time of surgery, when physiologically feasible, can facilitate optimal valve and ultrasound transducer alignment for serial postoperative evaluations of valve function.
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Douglas et al. (1974) studied this question.
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