英文誌(2004-)
Original Article(原著)
(0251 - 0260)
コントラスト・エコー法による肺動脈血流パターンと流速の推定について
Estimation of the Flow Pattern and Velocity in the Main Pulmonary Artery Studied by Simultaneous Cross-sectional and M-mode Echocardiography Combined with Contrast Technique
小泉 克己1, 梅田 徹1, 町井 潔1, 遠田 栄一2, 井田 喜博2
Katsumi KOIZUMI1, Toru UMEDA1, Kiyoshi MACHII1, Eiichi TODA2, Yoshihiro IDA2
1三井記念病院循環器センター, 2三井記念病院循環器検査室
1Center for Cardiovascular Disease Mitsui Memorial Hospital, 2Central Laboratory Mitsui Memorial Hospital
キーワード : contrast echo pattern, rebound pattern, pulmonary hypertension
The flow patterns in the main pulmonary artery (MPA) were estimated by both M-mode and cross-sectional contrast echocardiography in 19 cases with valvular diseases and 21 cases with congenital anomalies with left to right shunt, and were classified into 3 types in systole and 2 types in diastole. In cases with normal MPA pressure, contrast echos flow from the right ventricular outflow tract (RVOT) to the MPA throughout systole. In cases with severe pulmonary hypertension (PH), the contrast echos in the MPA flow toward the same direction in early systole as in cases with normal MPA pressure. However,the flow direction suddenly reversed in the mid-systole
and remained unchanged in the late systole. In cases with mild PH, a mixed pattern of the above two types was observed. Decreased compliance in the pulmonary arterial system, increased pulmonary arterial resistance, and dilatation of the MPA are thought to contribute to the formation of the Rebound Pattern.
In cases with pulmonary insufficiency, regurgitation of the contrast echos from the MPA to the RVOT in diastole was clearly detected.
Peak flow rates in the MPA were estimated from the slopes of the contrast echo flows in the
M-mode record. The slopes were tend to be greater in cases without PH than those with PH.