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ECHO CH 1 CARDIAC CYCLE

Horizontales
period of relaxation when ventricles fill with blood; AV valves open
atrial contraction aka atrial kick occurs, accounts for 10-30% of ventricular filling
accounts for 75% of ventricular filling in a normal heart; may cause 3rd heart sound in abnormal hearts
immediately precedes systole, all four valves closed, ventricular volumes remain constant while atrial volume changes and ventricular pressure rises in preparation of ventricular systole
may create a 4th heart sound in abnormal hearts
Closure of these cause 2nd heart sound
largest volume in the heart during cardiac cycle
Verticales
Closure of these creates the 1st heart sound
immediately precedes diastole, all four valves closed, ventricular volumes remain constant while atrial volume changes and ventricular pressure drops in preparation for ventricular diastole while atrial pressure rises
period of contraction when blood is ejected from the heart, SL valves open
ventricles at their lowest pressure and experience rapid filling
four phases: IVCT, systole, IVRT, diastole
slowing of blood flow as ventricular walls stretch causing LA and LV pressures to reach equilibrium