NSE 22A/B Lecture Notes - Lecture 9: Precordium, Rib Cage, Great Vessels
Document Summary
Physical examination and health assessment. (2 canadian ed. ) (canadian editors: browne, a. , Explain the cardiac cycle: diastole phase and systole phase. Diastole: the ventricles are relaxed, and the av valves (i. e. the tricuspid and mitral valves) are open, pressure in the atria is higher than that in the ventricles; blood pours rapidly intro the ventricles. Diastole again: at this point in the cardiac cycle, all four valves are closed and the ventricles relax (called isometric or isovolumic relaxation), describe the normal heart sounds: s1 and s2. Third heart sound (s3: normally diastole is a silent event ventricular lling creates vibrations that can be heard over the chest. S3 is heard when the ventricles are resistant to lling during the early rapid lling phase (protodiastole: occurs immediately after s2, when the av valves open and atrial blood rst pours into the ventricles.
