PHYSL212 Lecture Notes - Lecture 32: Wiggers Diagram, Diastole, Systolic Geometry
4 Dec 2016
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Physl 212 - lecture #32 - the cardiac cycle. Atria/ventricles don"t contract together: 80% of diastolic filling occurs before atria contracts. Definitions: systole: phase when ventricle is contracting, diastole: phase when ventricle is relaxing. Volume info: diastole length > systole length. When heart rate increases more, the diastolic length decreases more drastically: from the left ventricle perspective. Wiggers diagram: don"t memorize the specific numbers, but know the relative differences. Events of the wiggers diagram: mitral valve closure: end of diastole. That"s the highest point it will get. Left ventricle pressure is low: between mitral valve closure and aortic opening. When pressure is greater than volume in left ventricle. Peak systole: aortic pressure > left ventricle pressure: between aortic opening and aortic closing. Ejecting phase (blood is ejected from the ventricles: aortic closing. However, the pressure difference between aorta and the ventricle is not great enough to close the aorta.
