On the Method for Recording Ultrasound Cardiogram of the Tricuspid Valve
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概要
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The ultrasound cardiogram of the tricuspid valve has been hardly recorded, while that of the mitral valve is easily done.<BR>It is probable that the tricuspid valve makes an untoward angle with the ultrasound beam from the anterior chest wall so that the ultrasound beam may be little reflected from the valve in a direction to the transducer. The tricuspid valve is situated 4-5 cm. behind the sternum. Therefore in detecting its motion, the ultrasound beam should be sent obliquely to an anteroposterior direction from the vicinity of the left sternal edge to the retrosternal area. area. When the transducer is kept obliquely to the chest wall in manipulation, 1) the reproducibility and fine adjustment of the site and directing of the transducer are difficult to maintain, because the site and direction should be adjusted depending mainly on the memory of the operator, 2) the direction of the transducer is so unstable that anatomical relations between the ultrasound beam and the valve may be changed even due to a slight movement of the chest wall as in respiration.<BR>Such discrepancies seem to result in difficulty of detecting an echo from the tricuspid valve.<BR>The transducer was immersed in a water-filled vinyl bag placed on the chest wall so that it could be applied to desired site and direction without direct contact to the chest wall. It was made concave so that the ultrasound beam could pass through an intercostal space and be focused in a thin beam.<BR>The present equipment enabled one to obtain a satisfactory ultrasound cardiogram of the tricuspid valve in about half of the healthy subjects examined.
- 一般社団法人 日本生体医工学会の論文
一般社団法人 日本生体医工学会 | 論文
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