Physiology 2 Cardiac cycle
The cardiac cycle. talks bout valves and papillart muscles valve replacement
cardiac cycle
once complete set of systole and diastole
includes electrical events mechanical events valvular events
Diastole 1 (just after ventricular systole) (isovolumateric contraction)
all valves are shut no change in volume no flow presure in atrium is lower than ventricle but as atria fill from venous network pressure will build and av valves open and passive filling of the ventricles will begin
Diastole 2 ventricular filling
Late diastole
atrial contraction leading to atrial top up
final 20% injected into ventricles
EDV (end diastoleic volume) ~130 mL
Systole 1 (isovolumetric)
ventricles depolarise and pressure builds in the ventricles
Systole 2 (ventricular ejection)
LVP excees aortic pressure
Wiggers diagram
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JVP
atrial contract causes a pulse within the jugular veins
Heart rate and systole-diastole time
with increased HR systole is more tempoarlally maintained compared to diastole
this is because rapid filing and rapid ejection happens in systole and diastole
logarithmic curve
last 50 percent of cardiac cycle can be cut off and most can be maintianed
Heart sounds
S1 av valves closing S2 aortiv and pulmonary valves close
S3
S4
Murmurs: ususally due to turbulence