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Cardiac Cycle
Dr Faiza
Assistant Professor of Physiology
MBBS (Best Graduate, AIMC Lahore)
FCPS Physiology,
ICMT, CHPE, DHPE (STMU)
MPH (GC University, Faisalabad)
MBA (Virtual University of Pakistan)
Cardiac Cycle
Cardiac events that occur from the beginning of one heartbeat to the
beginning of the next are called the cardiac cycle
Do you know ….
How do atria act as primer pumps for ventricles?
Cardiac Cycle
β€’ Duration of Cardiac Cycle = 1/ Heart Rate
β€’ Effect of Tachycardia on duration of cardiac cycle
4/21/2024 5
4/21/2024 6
Cardiac Cycle- 7 Phases
Aortic Pressure Curve
Ventricular Pressure
Curve
Atrial Pressure Curve
Ventricular Volume
Curve
ECG
Heart Sounds
Valvular Changes
4/21/2024 8
1. Atrial Systole
a- wave in atrial
pressure curve
Not essential for
ventricular filling
Preceded by p-wave
4th Heart sound -
Pathological
4/21/2024 9
2. Isovolumic Contraction
AV valve close when
ventricular pressure
rises > Atrial Pressure
Volume is constant
Begins during QRS
Complex
1st Heart sound
4/21/2024 10
3. Rapid Ventricular Ejection
Aortic valve opens
Max ventricular
Pressure
C wave in venous
pressure curve-
Tricuspid Budging back
Most of stroke volume
ejected
Onset of T wave
Atrial Filling starts
4/21/2024 11
4. Reduced Ventricular
Ejection
Aortic Pressure
decreases
Ventricular pressure
starts decreasing
Atrial filling Continues,
v wave
Sloe ejection continues
4/21/2024 12
5. Isovolumic ventricular
Relaxation
Dicrotic Notch/Incisura
Aortic Valve closes
Ventricular P decreases
Ventricular Volume is
constant
T-wave complete
2nd heart sound
Inspiration delays closure of
the pulmonic valve and thus
causes splitting of the second
heart sound
4/21/2024 13
6. Rapid Ventricular Filling
Aortic P continues
decreasing
Mitral Valve opens, as
ventricular p< atrial P
ventricular filling from
the atrium begins
Third heart sound
4/21/2024 14
7. Diastasis/Reduced
Ventricular Filling- longest
phase
Slow ventricular Filling-
depending on Heart
Rate
4/21/2024 15
4/21/2024 18
Atrial Pressure Tracing
4/21/2024 19
Task
β€’ Tabulate the pressure and volume changes of left/right ventricle
during phases of cardiac cycle.
β€’ Describe the cause of incisura in aortic pressure curve.
β€’ What is the difference between stroke volume and ejection fraction.
Phases of Cardiac
Cycle
Description Ventricular Volume Ventricular Pressure
Isovolumic
Contraction
AV valve closes in beginning
Aortic valve opens in the end
Unchanged
EDV=120ml
Pressure rises
(upto 80mmHg)
Ejection Reduced by 60% of EDV
= stroke volume(70ml)
Rapid 1/3rd : 70%
Slow 2/3 : 30%
When Pressure>80mHg,
Aortic valve opens
Max pressure rise; upto
120mmHg
Isovolumic
Relaxation
Aortic valve closes at beginning
AV valve opens in the end
Constant
ESV = 40-50ml
Decrease rapidly,
(upto 2-3mmHg)
Rapid Inflow 1st third of Diastole
AV valve opens
Most rapid filling,
Volume increases rapidly
70% inflow of diastole
(about 100ml)
Low (close to zero)
Diastasis Middle third of diastole,
Longest phase,
From pulmonary veins to atrium
to ventricle directly
Increases only slightly Stays close to zero
Atrial Systole Atrial contraction
20% filling of ventricles,
Increased 20% by atrial
contraction
Slightly increased by blood
inflow
4/21/2024 21
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Cardiac Cycle Physiology Wiggers diagram.pdf

  • 1. Cardiac Cycle Dr Faiza Assistant Professor of Physiology MBBS (Best Graduate, AIMC Lahore) FCPS Physiology, ICMT, CHPE, DHPE (STMU) MPH (GC University, Faisalabad) MBA (Virtual University of Pakistan)
  • 2. Cardiac Cycle Cardiac events that occur from the beginning of one heartbeat to the beginning of the next are called the cardiac cycle
  • 3. Do you know …. How do atria act as primer pumps for ventricles?
  • 4. Cardiac Cycle β€’ Duration of Cardiac Cycle = 1/ Heart Rate β€’ Effect of Tachycardia on duration of cardiac cycle
  • 7.
  • 8. Cardiac Cycle- 7 Phases Aortic Pressure Curve Ventricular Pressure Curve Atrial Pressure Curve Ventricular Volume Curve ECG Heart Sounds Valvular Changes 4/21/2024 8
  • 9. 1. Atrial Systole a- wave in atrial pressure curve Not essential for ventricular filling Preceded by p-wave 4th Heart sound - Pathological 4/21/2024 9
  • 10. 2. Isovolumic Contraction AV valve close when ventricular pressure rises > Atrial Pressure Volume is constant Begins during QRS Complex 1st Heart sound 4/21/2024 10
  • 11. 3. Rapid Ventricular Ejection Aortic valve opens Max ventricular Pressure C wave in venous pressure curve- Tricuspid Budging back Most of stroke volume ejected Onset of T wave Atrial Filling starts 4/21/2024 11
  • 12. 4. Reduced Ventricular Ejection Aortic Pressure decreases Ventricular pressure starts decreasing Atrial filling Continues, v wave Sloe ejection continues 4/21/2024 12
  • 13. 5. Isovolumic ventricular Relaxation Dicrotic Notch/Incisura Aortic Valve closes Ventricular P decreases Ventricular Volume is constant T-wave complete 2nd heart sound Inspiration delays closure of the pulmonic valve and thus causes splitting of the second heart sound 4/21/2024 13
  • 14. 6. Rapid Ventricular Filling Aortic P continues decreasing Mitral Valve opens, as ventricular p< atrial P ventricular filling from the atrium begins Third heart sound 4/21/2024 14
  • 15. 7. Diastasis/Reduced Ventricular Filling- longest phase Slow ventricular Filling- depending on Heart Rate 4/21/2024 15
  • 16.
  • 17.
  • 20. Task β€’ Tabulate the pressure and volume changes of left/right ventricle during phases of cardiac cycle. β€’ Describe the cause of incisura in aortic pressure curve. β€’ What is the difference between stroke volume and ejection fraction.
  • 21. Phases of Cardiac Cycle Description Ventricular Volume Ventricular Pressure Isovolumic Contraction AV valve closes in beginning Aortic valve opens in the end Unchanged EDV=120ml Pressure rises (upto 80mmHg) Ejection Reduced by 60% of EDV = stroke volume(70ml) Rapid 1/3rd : 70% Slow 2/3 : 30% When Pressure>80mHg, Aortic valve opens Max pressure rise; upto 120mmHg Isovolumic Relaxation Aortic valve closes at beginning AV valve opens in the end Constant ESV = 40-50ml Decrease rapidly, (upto 2-3mmHg) Rapid Inflow 1st third of Diastole AV valve opens Most rapid filling, Volume increases rapidly 70% inflow of diastole (about 100ml) Low (close to zero) Diastasis Middle third of diastole, Longest phase, From pulmonary veins to atrium to ventricle directly Increases only slightly Stays close to zero Atrial Systole Atrial contraction 20% filling of ventricles, Increased 20% by atrial contraction Slightly increased by blood inflow 4/21/2024 21