lastwords

afterload

1-4
English German
afterload subst. die Afterload f
  die Nachlast f
afterload subst. der Nachbelastung m
afterloading subst. das Afterloading-Verfahren n
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Afterload aus Wikipedia. Zum Beitrag

Afterload - Wikipedia, the free encyclopedia a.new,#quickbar a.new{color:#ba0000} /* cache key: enwiki:resourceloader:filter:minify-css:5:f2a9127573a22335c2a9102b208c73e7 */ Afterload From Wikipedia, the free encyclopedia Jump to: , Ventricular systole. Red arrow is path from left ventricle to aorta. Afterload is largely dependent upon aortic pressure. Afterload is an inexact medical/physiologic term historically hidden from computational/mathematical models that purportedly measures the tension produced by a specified chamber of the If the chamber is not mentioned, it is usually assumed to be the left ventricle. The most common definition of "afterload" is based on the properties of single cardiomyocytes. It is therefore only of direct relevance in the laboratory; in the clinic, the term "end-systolic pressure" is usually more appropriate, although not equivalent. Afterload can also be described as the pressure that the chambers of the heart must generate in order to eject blood out of the heart and thus is a consequence of the aortic pressure (for the left ventricle) and pulmonic pressure or pulmonary artery pressure (for the right ventricle). The pressure in the ventricles must be greater than the systemic and pulmonary pressure to open the aortic and pulmonic valves, respectively. As afterload increases, cardiac output decreases. Cardiac imaging is a somewhat limited modality in defining afterload because it depends on the interpretation of volumetric data. Preload best describes the maximum viscous blood volume of end diastole while afterload better describes the maximum tension of the myocardial muscle mass in end systole. Precise mathematical labeling of afterload and preload is a challenge since both maximum measurements (volume/tension) occur simultaneously in late systole.

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Pathology

Disease processes pathology that include indicators such as an increasing left ventricular afterload include elevated blood pressure and aortic valve disease. Systemic Pulmonary hypertension (PH) is increased blood pressure within the right heart leading to the lungs. PH indicates a regionally applied increase in afterload dedicated t... mehr

Afterload aus Wikipedia. Zum Beitrag


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