cardiac cycle Flashcards
major events atrial systole (A)
atria contract
final phase of ventricular filling
EKG atrial systole (A)
P wave
PR interval
valves atrial systole (A)
none
major events isovolumetric ventricular contraction (B)
ventricles contract
ventricular pressure increases
ventricular volume is constant (all valves closed)
EKG isovolumetric ventricular contraction (B)
QRS complex
valves isovolumetric ventricular contraction (B)
mitral valve closes
major events rapid ventricular ejection (C)
ventricles contract
ventricular pressure increases and reaches maximum
ventricles eject blood into arteries
ventricular volume decreases
aortic pressure increases and reaches maximum
EKG rapid ventricular ejection (C)
ST segment
valves rapid ventricular ejection (C)
aortic valve opens
major events reduced ventricular ejection (D)
ventricles eject blood into arteries (slower rate)
ventricular volume reaches minimum
aortic pressure starts to fall as blood runs off into arteries
EKG reduced ventricular ejection (D)
T wave
valves reduced ventricular ejection (D)
none
major events isovolumetric ventricular relaxation (E)
ventricles relaxed
ventricular pressure decreases
ventricular volume constant
EKG isovolumetric ventricular relaxation (E)
none
valves isovolumetric ventricular relaxation (E)
aortic valve closes
major events rapid ventricular filling (F)
ventricles relaxed
ventricles fill passively with blood from atria
ventricular volume increases
ventricular pressure low and constant
EKG rapid ventricular filling (F)
none
valve rapid ventricular filling (F)
mitral valve opens
major events reduced ventricular filling/diastasis (G)
ventricle relaxed
final phase of ventricular filling
which phase for max ventricular volume?
atrial systole (A)
which phase for max ventricular pressure?
rapid ventricular ejection (C)
which phase for min ventricular volume?
reduced ventricular ejection (D)
aortic stenosis
LVP pressure less than aortic pressure during ejection
aortic pressure rise slightly reduced
mitral stenosis
LAP > LVP during filling
increasing LAP
resistance causes blood to back up, reducing LV filling
aortic regurgitation
increase in volume and pressure in chamber
LE compensates by increase SV
increase in SV –> increases LVP
mitral regurgitation
blood regurgitates from LV into atrium during systole
LAP increased
regurg flow decreases LV SV and causes enlargement of atrial chamber
