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CARDIOVASCULAR SYSTEM LECTURE - IX

CARDIOVASCULAR SYSTEM LECTURE - IX. DR. ZAHOOR ALI SHAIKH. PRESSURE CHANGES DURING CARDIAC CYCLE. Pressure changes during cardiac cycle. Rt- Atrium = 2-8mm Hg. Lt- Atrium = 2-10 mm Hg. Rt – Ventricle = 25 / 6(2-8) mm Hg. Lt – ventricle = 120 / 8(2-10) mm Hg. Aorta = 120 / 80 mm Hg.

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CARDIOVASCULAR SYSTEM LECTURE - IX

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  1. CARDIOVASCULAR SYSTEMLECTURE - IX DR. ZAHOOR ALI SHAIKH

  2. PRESSURE CHANGES DURING CARDIAC CYCLE

  3. Pressure changes during cardiac cycle Rt- Atrium = 2-8mm Hg. Lt- Atrium = 2-10 mm Hg. Rt – Ventricle = 25 / 6(2-8) mm Hg. Lt – ventricle = 120 / 8(2-10) mm Hg. Aorta = 120 / 80 mm Hg. Pul. Artery = 25 / 10 mm Hg.

  4. Draw pressure curve for Lt.ventricle, Aorta & Lt. Atrium • Draw pressure curve for Rt. Ventricle & Pul. Artery. • Draw waves of Juglar Venous Pulse (JVP). • Draw waves of Carotid Arterial Pulse.

  5. First three curves show pressure changes in Lt. vent., Aorta & Lt. atrium

  6. pressure curves for Rt. ventricle. & Pulmonary Artery

  7. Juglar Venous Pulse (JVP)

  8. Carotid Arterial Pulse

  9. LECTURE XVOLUME CHANGES DURING CARDIAC CYCLE

  10. Define Stroke Volume (SV) • Define End Diastolic Volume (EDV) • Define End Systolic Volume (ESV) • Define Ejection Fraction (EF)

  11. Stroke Volume: It is a volume of blood pumped out by each ventricle per beat. It is about 70 ml. Stroke volume (SV) = EDV – ESV • End Diastolic Volume: Volume of blood in each ventricle at the end of diastole. It is about 110 – 120 ml. • End Systolic Volume: Volume of blood in each ventricle at the end of Systole. It is about 40 to 50 ml

  12. Volume changes during cardiac cycle

  13. SV (EDV – ESV) X 100 EDV • Ejection fraction (EF) is the percentage of ventricular end diastolic volume (EDV) which is ejected with each stroke. EF = 75 X 100 = 62.5% 120 Normal ejection fraction is about 60 – 65 %. Ejection fraction is good index of ventricular function.

  14. PRESSURE VOLUME LOOP • EVENTS OF CARDIAC CYCLE

  15. Relationship between Lt. ventricular volume & pressure changes

  16. Events of cardiac cycle for Lt. ventricular function showing changes in Lt. atrial pressure, Lt. ventricular pressure, aortic pressure, ventricular volume, ECG & phonocardiogram

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