| 单词 |
afterload |
| 释义 |
afterload, n. Physiol.|ˈɑːftələʊd|
[f. after- 6 + load n.]
The load which must be overcome by the cardiac muscles at the beginning of systole. Cf. pre-load n.
1941Amer. Jrnl. Physiol. CXXXIV. 643 To define work, oxygen consumption and efficiency, it is necessary to consider the nature of the load as regards initial load (venous return), and after load (resistance to emptying), as well as in regard to heart size. 1961Circulation Res. IX. 1152/2 The only variable was the increase in the afterload, which was instituted at a time during which the aortic valves were closed. 1989Brit. Med. Jrnl. 27 May 1431/2 Reduction in afterload enhances performance of the failing ventricle by decreasing myocardial wall tension and oxygen requirements.
So ˈafterloaded ppl. a., subjected to an afterload.
1966Circulation Res. XVIII. 742/1 These workers utilized lightly afterloaded control beats. 1970Ibid. XXVI. 279 Isometric, afterloaded and isotonic contractions of cat right ventricular papillary muscle were studied in vitro at 30°C or 37°C. 1987Oxf. Textbk. Med. (ed. 2) II. xiii. 10/2 The contraction of the intact heart can be visualized as being similar mechanically to the afterloaded contraction of an isolated muscle strip. |
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