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頁籤選單縮合
題 名 | Ventricular Contractile Interaction Following Coronary Ligation in Dogs=心室之間收縮力關係在狗動物實驗的觀察 |
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作 者 | 陳穎從; 林君柔; 李應紹; | 書刊名 | 中華醫學雜誌 |
卷 期 | 57:6 1996.06[民85.06] |
頁 次 | 頁385-391 |
分類號 | 415.31 |
關鍵詞 | 最大加速度; 心室功能; Maximum acceleration; Ventricular function; |
語 文 | 英文(English) |
中文摘要 | 背景 左右兩心室之間功能的變化具有互相牽制的作用,改變左心室 功能會導致右心室功能變化,反之亦然。然而其影響程度如何?至今仍無完整 之文獻報告。本研究的目的是分別結紮左前降枝或右冠狀動脈來評估左右兩心 室之間收縮功能的交互關係。 方法 18隻狗分為兩組各9隻,全身麻醉並使用呼吸器,在主動脈及肺動脈 放置電磁力導管(electromagnetic catheter)測量壓力及血流的變化,利用雙面超音 波測量心室壁動力(ventricular wall motion)及面積百分率 (percentage change of fractional area)。開胸之後分別結紮左前降枝或右冠狀動脈,結紮前後分別測量 左、右心室收縮力(dp/dt)、最大加速度(maximal acceleration, MA)、開始收縮至最 大加速度的時間(time to maximal acceleration, TTMA)。 結果 發現心肌缺氧後,心室收縮力及最大加速度很快就有變化,而且當面積 百分率變化時,dp/dt、MA及TTMA亦隨之明顯下降。結紮左冠狀動脈時,梗 塞範圍包括前壁、室中膈及心尖,左右心室功能均有變化。結紮右冠動脈時, 空中膈動力不變,右心室的血流動力學明顯改變,但不影響左心室功能。 結論 冠狀動脈梗塞直接對於心肌的影響遠大於對心室之間的交互作用,且室 中膈在心室的牽制作用中扮演一個重要的角色。 |
英文摘要 | Background. Ventricular interdependence has already been reported. Diastolic ventricular interaction is well studied, but information is rare regarding systolic ventricular interaction and has shown only that maximal acceleration is a sensitive indicator of left ventricular performance. Hence, this study was conducted. Methods. Eighteen mongrel dogs were anesthetized and two Millar catheters were advanced from the femoral artery and vein to the left ventricle and pulmonary artery for measurement of pressure, flow and velocity in each. Before and after ligation of the left anterior descending or right coronary artery, both ventricles, dP/dt max, maximum acceleration (MA), time to maximal acceleration (TTMA) were measured simultaneously and the percentage of area change and ventricular wall motion were recorded by two-dimensional echocardiography. Results. The percentage of fraction area change decreased significantly when associated with decrease in dP/dt, maximal acceleration and TTMA in both ventricles The parameters of contractility dP/dt and MA were marked and occurred earlier, after ischemia. In the ligation of LAD, infarct area involved the anteroseptal and apical region and both ventricular dysfunctions were noted. In the ligation of RCA when the interventricular septum motion was preserved, the RY hemodynamic had significant changes including dP/dt and MA, but there was insignificant change in LV. Conclusions. Ventricular interaction is less important than the direct effects of coronary occlusion on the myocardium, and the interventricular septum plays a relatively important part in ventricular interaction. |
本系統中英文摘要資訊取自各篇刊載內容。