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CardiacCycle
Dr. Muhammad Usman Hashmi
CARDIACCYCLE
A single cycle of cardiac activity can be divided into two basic phases:
Diastole (Represents the period of time when the ventricles are relaxed).
Systole (Represents the time during which the left and right ventricles contract
and eject blood into the aorta and pulmonary artery).
The cardiac cycle is usually divided into seven phases:
Phase 1 - Atrial Contraction
Phase 2 - Isovolumetric Contraction
Phase 3 - Rapid Ejection
Phase 4 - Reduced Ejection
Phase 5 - Isovolumetric Relaxation
Phase 6 - Rapid Filling
Phase 7 - Reduced Filling
CARDIACCYCLE
1- ATRIALCONTRACTION
 It is initiated by the P wave (Depolarization of the atria).
 As the atria contract  the pressure in atria increases  which forces more
blood flow across the open atrioventricular (AV) valves  leading to a rapid
flow of blood into the ventricles.
 Atrial contraction produce a small increase in AP which represent as "a-
wave"
 Atrial contraction (fourth heart sound, S4).
2- ISOVOLUMETRICCONTRACTION
 All valves are closed (Allow ventricle build pressure)  Mitral valve will bulge back
(C wave)  build pressure in the ventricles (should exceed 80 mmhg).
This phase represented in ECG as QRS wave (Ventricular depolarization).
 Closure of the AV valves results in the first heart sound (S1).
3- RAPIDANDSLOWEJECTION
PHASES.
 Ventricular pressure exceed (80 mmhg)  Aortic and Pulmonic Valves Open  rapid
ejection.
 A and P Valves Open; AV Valves Remain Closed (blood filling in the atrium  but
still closed).
 After200 msec ventricular pressure start falling down + aortic pressure falling down
 slow ejection.
 No heart sounds are ordinarily noted during ejection.
4- ISOVOLUMICRELAXATION
 T wave represent the repolarization of ventricles  there will be falling of
ventricular pressure  A and P valves closed (make S2).
Left atrial pressure (LAP) continues to rise because of venous return from the
lungs. The peak LAP at the end of this phase is termed the v-wave.
5- RAPIDANDSLOWPASSIVE
VENTRICULARFILLING
 The mitral valve is open  the blood fill the ventricle without atrial contraction we
get ventricular filling the blood come back from the body and lungs cause
ventricular filling.
 The volume increases until the p wave occur and the next cycle start
 Ventricular filling is normally silent. When a third heart sound (S3)??
Cardiac cycle- day 4.pptx
SUMMARY
Cardiac cycle is single cycle that represent systole and
diastole.
The cardiac cycle is usually divided into seven
phases:
Phase 1 - Atrial Contraction
Phase 2 - Isovolumetric Contraction
Phase 3 - Rapid Ejection
Phase 4 - Reduced Ejection
Phase 5 - Isovolumetric Relaxation
Phase 6 - Rapid Filling
Phase 7 - Reduced Filling

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Cardiac cycle- day 4.pptx

  • 2. CARDIACCYCLE A single cycle of cardiac activity can be divided into two basic phases: Diastole (Represents the period of time when the ventricles are relaxed). Systole (Represents the time during which the left and right ventricles contract and eject blood into the aorta and pulmonary artery). The cardiac cycle is usually divided into seven phases: Phase 1 - Atrial Contraction Phase 2 - Isovolumetric Contraction Phase 3 - Rapid Ejection Phase 4 - Reduced Ejection Phase 5 - Isovolumetric Relaxation Phase 6 - Rapid Filling Phase 7 - Reduced Filling
  • 4. 1- ATRIALCONTRACTION  It is initiated by the P wave (Depolarization of the atria).  As the atria contract  the pressure in atria increases  which forces more blood flow across the open atrioventricular (AV) valves  leading to a rapid flow of blood into the ventricles.  Atrial contraction produce a small increase in AP which represent as "a- wave"  Atrial contraction (fourth heart sound, S4).
  • 5. 2- ISOVOLUMETRICCONTRACTION  All valves are closed (Allow ventricle build pressure)  Mitral valve will bulge back (C wave)  build pressure in the ventricles (should exceed 80 mmhg). This phase represented in ECG as QRS wave (Ventricular depolarization).  Closure of the AV valves results in the first heart sound (S1).
  • 6. 3- RAPIDANDSLOWEJECTION PHASES.  Ventricular pressure exceed (80 mmhg)  Aortic and Pulmonic Valves Open  rapid ejection.  A and P Valves Open; AV Valves Remain Closed (blood filling in the atrium  but still closed).  After200 msec ventricular pressure start falling down + aortic pressure falling down  slow ejection.  No heart sounds are ordinarily noted during ejection.
  • 7. 4- ISOVOLUMICRELAXATION  T wave represent the repolarization of ventricles  there will be falling of ventricular pressure  A and P valves closed (make S2). Left atrial pressure (LAP) continues to rise because of venous return from the lungs. The peak LAP at the end of this phase is termed the v-wave.
  • 8. 5- RAPIDANDSLOWPASSIVE VENTRICULARFILLING  The mitral valve is open  the blood fill the ventricle without atrial contraction we get ventricular filling the blood come back from the body and lungs cause ventricular filling.  The volume increases until the p wave occur and the next cycle start  Ventricular filling is normally silent. When a third heart sound (S3)??
  • 10. SUMMARY Cardiac cycle is single cycle that represent systole and diastole. The cardiac cycle is usually divided into seven phases: Phase 1 - Atrial Contraction Phase 2 - Isovolumetric Contraction Phase 3 - Rapid Ejection Phase 4 - Reduced Ejection Phase 5 - Isovolumetric Relaxation Phase 6 - Rapid Filling Phase 7 - Reduced Filling