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ANATOMY:Cardiac Cycle
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Transcript of ANATOMY:Cardiac Cycle
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CARDIAC CYCLE
SYSTOLE AND DIASTOLEPHASES :
A.RAPID FILLINGB.DIASTASISC.ISOVOLUMETRIC CONTRACTION
D.RAPID EJECTIONE.ISOVOLUMIC RELAXATION
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Cardiac Cycle
SystoleMuscle is ContractingA contracting sphere generates Pressure
Pressure causes a change in VolumeThis is measured by CONTRACTILITYThis is affected by
Function of MuscleInitial Volume (PRELOAD)Initial Pressure (AFTERLOAD)
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Fig. 9-16, p. 256
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Cardiac Cycle
DiastoleMuscle is RelaxingVeins return blood to the heartAs the heart fills with blood, the absolutevolume and pressure changeThis relationship is measured byCOMPLIANCEThis is affected by
Connective TissueVenous PressureVenous Resistance
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Cardiac Cycle
Early SystoleThe Pressure in the Ventricle is the
same as in the great veinsThe Ventricle contractsThe AV valves closeSince the Aortic and Pulmonic valves
were already closed, the heart is aclosed ballAs the heart contracts, the pressure inthe ball rises at a fixed volume.
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Cardiac Cycle
Late SystoleThe Pressure in the Ventricles is thesame as in the great arteriesThe A/P valves openFurther contraction of the ventriclescauses blood flow at a relativelyconstant pressure
(this is because the aorta is compliantas well and increase in volume causesonly a small increase in pressure)
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Cardiac Cycle
Early DiastoleThe Ventricles begin to relax
As the Ventricular pressure falls belowthe great artery pressure, the A/Pvalves closeSince the AV valves were already
closed, the heart is a closed ballAs the heart relaxes, the pressure inthe ball falls at a fixed volume.ISOMETRIC RELAXATION
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Cardiac Cycle
Late DiastoleWhen the pressure inside the heartfalls below the pressure of the greatveins AND the papillary muscles haverelaxed, the AV valves openThe blood flows down its pressuregradient and the ventricles fill passively
at a fixed pressure (because theventricle has compliance)ISTONIC RELAXATION
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Cardiac Cycle
End DiastoleAtrial Contraction
Early SystoleIsometric Contraction
Late SystoleIsotonic Contraction
Early DiastoleIsometric Relaxation
Late DiastoleIsotonic Relaxation
End Diastole
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P ressure Volume Loop
EarlySystole
Late Systole
EndDiastole
Early
Diastole
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P ressure Volume Loop
EarlySystole
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P ressure Volume Loop
Late Systole
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P ressure Volume Loop
EarlyDiastole
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P ressure Volume Loop
LateDiastole
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P ressure Volume Loop
EndDiastole
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RELATIONSHI P OF ECG TO CARDIAC
CYCLE
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P
R
QS
T P
PR ST TP interval
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