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CARDIAC CYCLE

CARDIAC CYCLE. PHYSIOLOGY CARDIOVASCULAR MODULE PHASE II 2007-2008. INSTRUCTOR INFORMATION. Dr AZRA KIRMANI ASSISTANT PROFESSOR DEPARTMENT OF PHYSIOLOGY ROOM NO 951/1 FIRST FLOOR BUILDING 9 EXT- 24306 MOBIL- 0501639346, RESIDENCE - 6022433.

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CARDIAC CYCLE

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  1. CARDIAC CYCLE PHYSIOLOGY CARDIOVASCULAR MODULE PHASE II 2007-2008 cvs module phase II MBBS 2007-2008

  2. INSTRUCTOR INFORMATION Dr AZRA KIRMANI ASSISTANT PROFESSOR DEPARTMENT OF PHYSIOLOGY ROOM NO 951/1 FIRST FLOOR BUILDING 9 EXT- 24306 MOBIL- 0501639346, RESIDENCE - 6022433 cvs module phase II MBBS 2007-2008

  3. cvs module phase II MBBS 2007-2008

  4. Events of the cardiac cycle at a heart rate of 75 beats/min Atrial systole 0.1 second Atrial Systole 0.7 seconds Ventricular Diastole 0.5 seconds Ventricular Systole 0.3 seconds cvs module phase II MBBS 2007-2008

  5. Late Diastole cvs module phase II MBBS 2007-2008

  6. Atrial Systole cvs module phase II MBBS 2007-2008

  7. Atrial Systole cvs module phase II MBBS 2007-2008

  8. ATRIAL SYSTOLEECG cvs module phase II MBBS 2007-2008

  9. ATRIAL SYSTOLEHeart Sounds cvs module phase II MBBS 2007-2008

  10. Atrial systole contributes 30% 0f ventricular filling. • The end diastolic ventricular volume is 130ml. cvs module phase II MBBS 2007-2008

  11. Isovolumetric ventricular contraction cvs module phase II MBBS 2007-2008

  12. ISOVOLUMETRIC CONTRACTIONECG cvs module phase II MBBS 2007-2008

  13. ISOVOLUMETRIC CONTRACTIONHeart Sounds cvs module phase II MBBS 2007-2008

  14. Ventricular Ejection cvs module phase II MBBS 2007-2008

  15. RAPID EJECTIONPressures & Volumes cvs module phase II MBBS 2007-2008

  16. RAPID EJECTIONECG cvs module phase II MBBS 2007-2008

  17. RAPID EJECTIONHeart Sounds cvs module phase II MBBS 2007-2008

  18. REDUCED EJECTION Late in systole, the aortic pressure actually exceeds the ventricular, but for a short period momentum keeps the blood moving forward. cvs module phase II MBBS 2007-2008

  19. REDUCED EJECTIONHeart Sounds cvs module phase II MBBS 2007-2008

  20. PROTODIASTOLE • Once the ventricular muscle is fully contracted, the already falling ventricular pressures drop more rapidly. This is the period of protodiastole. It lasts about 0.04 s. It ends when the momentum of the ejected blood is overcome and the aortic and pulmonary valves close, setting up transient vibrations in the blood and blood vessel walls. cvs module phase II MBBS 2007-2008

  21. The amount of blood ejected by each ventricle per stroke at rest is 70-90 mL. • The end-diastolic ventricular volume is about 130 mL. • Thus, about 50 mL of blood remains in each ventricle at the end of systole (end-systolic ventricular volume). • The ejection fraction, the percent of the end-diastolic ventricular volume that is ejected with each stroke, is about 65%. • The ejection fraction is a valuable index of ventricular function. cvs module phase II MBBS 2007-2008

  22. Isovolumetric ventricular relaxation cvs module phase II MBBS 2007-2008

  23. ISOVOLUMETRIC RELAXATION cvs module phase II MBBS 2007-2008

  24. ISOVOLUMETRIC RELAXATIONECG cvs module phase II MBBS 2007-2008

  25. ISOVOLUMETRIC RELAXATIONHeart Sounds cvs module phase II MBBS 2007-2008

  26. RAPID VENTRICULAR FILLINGHeart cvs module phase II MBBS 2007-2008

  27. RAPID VENTRICULAR FILLING Pressures & Volumes cvs module phase II MBBS 2007-2008

  28. RAPID VENTRICULAR FILLING ECG cvs module phase II MBBS 2007-2008

  29. RAPID VENTRICULAR FILLINGHeart Sounds cvs module phase II MBBS 2007-2008

  30. REDUCED VENTRICULAR FILLING Pressures & Volumes cvs module phase II MBBS 2007-2008

  31. REDUCED VENTRICULAR FILLING ECG cvs module phase II MBBS 2007-2008

  32. REDUCED VENTRICULAR FILLING Heart Sounds cvs module phase II MBBS 2007-2008

  33. cvs module phase II MBBS 2007-2008

  34. cvs module phase II MBBS 2007-2008

  35. Events of the cardiac cycle at a heart rate of 75 beats/min • 1, atrial systole; • 2, isovolumetric ventricular contraction; • 3, ventricular ejection; • Rapid ejection • Slow ejection • Protodiastole • 4, isovolumetric ventricular relaxation; • 5, ventricular filling. cvs module phase II MBBS 2007-2008

  36. Note that late in systole, aortic pressure actually exceeds leftventricular pressure. However, the momentum of the blood keeps it flowing out of the ventricle for a short period. cvs module phase II MBBS 2007-2008

  37. cvs module phase II MBBS 2007-2008

  38. cvs module phase II MBBS 2007-2008

  39. Right Ventricular & Pulmonary Arterial Pressure cvs module phase II MBBS 2007-2008

  40. cvs module phase II MBBS 2007-2008

  41. cvs module phase II MBBS 2007-2008

  42. cvs module phase II MBBS 2007-2008

  43. Pressure Volume Relationship cvs module phase II MBBS 2007-2008

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