医学
射血分数
心脏病学
心室
双翼飞机
内科学
二尖瓣反流
冲程容积
舒张期
收缩
长轴
心脏周期
收缩末期容积
几何学
心力衰竭
血压
数学
工程类
航空航天工程
作者
Pantel Vokonas,Richard Gorlin,Peter F. Cohn,Michael V. Herman,Edmund H. Sonnenblick
出处
期刊:Circulation
[Ovid Technologies (Wolters Kluwer)]
日期:1973-10-01
卷期号:48 (4): 786-796
被引量:75
标识
DOI:10.1161/01.cir.48.4.786
摘要
High-speed biplane left ventricular (LV) cineangiograms were analyzed for changes in volume, shape, and dimensions in 35 patients. Ventriculographic studies in ten normal subjects characterized by an ejection fraction (E.F.) of 67 ± 2% and an end-diastolic volume (EDV) of 90 ± 8 ml/m 2 were compared with results from 25 patients with isolated mitral regurgitation of varying severity. Patients with mitral regurgitation (MR) were subdivided according to whether or not the ejection fraction was normal. Those with normal E.F. (70 ± 2%) were termed compensated MR (CMR) and had EDV 192 ± 7 ml/m 2 . Those with decreased E.F. 34 ± 3% were termed decompensated MR (DMR) and had EDV 277 ± 17 ml/m 2 . In normal subjects no significant changes in LV dimensions were noted during the isovolumic phase of contraction while in patients with compensated MR the transverse axis shortened an average of 5.2% with no change in the longitudinal axis (L). Changes in geometry prior to ejection were less evident in the group with decompensated MR. In normal subjects during ejection the extent of circumferential fiber shortening was 38 ± 1%, and longitudinal shortening was 18 ± 1%. In CMR slightly greater changes were observed in LV dimensions. In DMR both circumferential and longitudinal shortening was significantly reduced (17 ± 2% and 8 ± 1%, respectively). Assuming an ellipsoidal model of the LV chamber, eccentricity (e) was calculated to assess the degree of roundness. In normal subjects, e increased from 0.85 at end-diastole to 0.92 at end-systole. In compensated MR, end-diastolic shape was more rounded with e increasing from 0.75 to 0.88 during systole. In decompensated MR there was only a small change in e from 0.70 to 0.73 during systole, indicating that a globular configuration persisted in systole as well as diastole. These differences could not be satisfactorily explained in terms of etiology, age, regurgitant volume load or its duration. The differences between the two groups of patients were best expressed by the difference in ejection fraction and globularity of the LV. A relationship to absolute EDV between the two groups was less evident. These differences may be due to development of organic changes in the architecture of heart wall in those patients with decompensated MR.
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