Summary
An ultrasonic instrument was devised to aide accurate placement of the cardiac tube during the vertriculo-atrial shunt operation. The ultrasonic method was applied in 22 clinical cases in surgery and compared with the roentogenographic method and the endocardiac electrocardiographic method. The tricuspid valve echo was easily detected, because it has characteristic pulsating, polyspiky and shifting nature within an extent of 1 cm according to the cardiac beat. It was concluded from the comparative study that the roentogenographic method only gives silhouette, and the relationship between the probe tip and the vertebral body segment was almost inconsistent. Furthermore, the endocardiac electrocardiogram did not always show biphasic P wave and biphasic P wave was recorded at various distances ranging from 0 cm to 3.5 cm from the tricuspid valve. On the other hand, the ultrasonic method has the important advantages that the distance between the probe tip and the tricuspid valve can be measured directly and correctly, thus enabling operator to place the probe at any desired position in relation to the tricuspid valve.
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Yagyu, Y. Use of ultrasound in detecting optimum position of distal end of ventriculoatrial shunt in relation to tricuspid. The Japanese Journal of Surgery 1, 186–201 (1971). https://doi.org/10.1007/BF02468908
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DOI: https://doi.org/10.1007/BF02468908