Atriogenic Mitral Valve RefluxDiastolic Mitral Incompetence Following Isolated Atrial Systoles
作者:
John Williams,
T. O'donovan,
Russell Vandenberg,
Ralph Sturm,
Earl Wood,
期刊:
Circulation Research
(OVID Available online 1968)
卷期:
Volume 22,
issue 1
页码: 19-28
ISSN:0009-7330
年代: 1968
出版商: OVID
关键词: mitral valve closure;atrial contraction;heart block;ventricular asystole;mitral incompetence;videodensitometry;extrasystoles;dogs
数据来源: OVID
摘要:
Cardiac and aortic pressures were recorded after stellate ganglionectomy and vagotomy. Acute heart block was produced by injecting the atrioventricular node, and atrial and ventricular systoles were controlled electronically to occur independently or in any desired relationship. Angiocardiograms recorded on video tape after injections of 4 ml 69% Renovist into the left ventricle were analyzed with a videodensitometer able to detect small refluxes of contrast medium into the left atrium and correlate them with phases of the cardiac cycle. When ventricular driving was temporarily suspended but atrial driving continued, pressure records indicated mitral valve closure after each atrial systole, but reflux of contrast medium into the atrium occurred after each systole not followed by a normally sequenced ventricular systole. Driving with a 2: 1 atrioventricular stimulation resulted in reflux, with the alternate atrial contraction dissociated from ventricular systole. Thus, the mitral valve was not effectively closed by atrial systoles that were not followed by normally sequenced ventricular systoles.
点击下载:
PDF
(613KB)
返 回