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英文誌(2004-)

Journal of Medical Ultrasonics

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1983 - Vol.10

Vol.10 No.06

Original Article(原著)

(0387 - 0394)

超音波Mモード法による先天性完全房室ブロックの出生前診断に関する検討

Prenatal Diagnosis of Congenital Complete Atrioventricular Block by Ultrasound Cardiography

原 賢治1, 小柳 孝司1, 進 岳史1, 坂元 力1, 久保田 史郎2, 中野 仁雄1

Kenji HARA1, Takashi KOYANAGI1, Takeshi SHIN1, Chikara SAKAMOTO1, Shiro KUBOTA2, Hitoo NAKANO1

1九州大学医学部婦人科産科学教室, 2久保田産婦人科

1Department of Gynecology and obstetrics Kyushu University, Faculty of Medicine, 2Kubota Obstetrics and Gynecology

キーワード : congenital complete atrioventricular block, prenatal diagnosis, echocardiogram, atrioventricular valve

Using real-time ultrasound equipment (Toshiba SSH-11A and Toshiba SSL-53M), the investigation was done on the 4 fetuses in utero with complete atrioventricular block. Based on the echocardiographic findings, antenatal diagnosis was made:
1) The atrioventricular valves offer two different types of wave components, one of which is characterized by the high amplitude and long duration on the M-mode record, the other having the only small deflection as termed "A" kicking.
2) These two components possess the different cycles with each other. Large wave components were thought to correspond to the ventricular dilatation. Considering the direction of blood flow at the level of atrioventricular canal, the small components were thought to represent the atrial contraction. These cases were confirmed as having the complete atrioventricular block by the electrocardiographic findings in the early neonatal period.  
Accordingly, the antenatal diagnosis of complete atrioventricular block could be made by the detection of the large and small waves with independent and different cycles.