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EKG

120. Mm Hg. 0. 130. ml. 40. A. Aortic Pressure. Ventricular Pressure. The P wave denotes atrial depolarization. Ventricular Volume. P. EKG. 120. Mm Hg. Contracting atria cause ventricular volume and pressure to increase – See units to the right. 0. 130. ml.

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EKG

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  1. 120 Mm Hg 0 130 ml 40 A Aortic Pressure Ventricular Pressure The P wave denotes atrial depolarization. Ventricular Volume P EKG

  2. 120 Mm Hg Contracting atria cause ventricular volume and pressure to increase – See units to the right 0 130 ml PR interval of EKG Atria depolarized and contracting 40 B Aortic Pressure Ventricular Pressure Ventricular Volume P EKG

  3. 120 Mm Hg Preload – Usually represented as the pressure immediately preceding ventricular contraction 0 130 ml 40 C Aortic Pressure Ventricular Pressure Ventricular Volume P EKG

  4. Following ventricular depolarization the ventricles begin to contract this causes the pressure in the ventricles to begin to rise and the AV valves close. However, since all the valves are now shut…… 120 Mm Hg 0 ventricular volume remains constant as no blood can leav (isovolumetric) 130 ml QRS represents depolarization of the ventricles 40 Aortic Pressure Ventricular Pressure Ventricular Volume P D EKG

  5. AV valves close 120 Mm Hg 0 130 ml 40 QRS E Aortic Pressure To review, the QRS wave denotes ventricular depolarization. This is followed by ventricular contraction causing pressure in the ventricles to begin to rise. This intraventricular pressure increase immediately closes the AV valves. Ventricular Pressure Ventricular Volume P EKG

  6. AV valves close 120 Semilunar valves open Mm Hg 0 130 ml 40 QRS As pressure builds in the ventricles all the valves remain shut. Aortic and pulmonary artery pressures oppose opening of the respective valves. They remain closed until ventricular pressures very slightly exceed the arterial pressures in these vessels. When this pressure is achieved, the pulmonary and aortic valves open. Aortic Pressure Ventricular Pressure Ventricular Volume F P EKG

  7. AV valves close 120 Semilunar valves open Mm Hg 0 130 ml 40 QRS Aortic Pressure As long as ventricular pressure exceeds arterial pressure, blood is squeezed out of the ventricles and their volume decreases. Ventricular Pressure Ventricular Volume P G EKG

  8. AV valves close 120 Semilunar valves open Mm Hg Afterload Preload 0 130 ml 40 QRS F, H Aortic Pressure Ventricular Pressure Afterload is the intraventricular pressure required to cause blood to exit the ventricles. It varies throughout the ejection phase. Ventricular Volume P EKG

  9. AV valves close 120 Semilunar valves open Mm Hg Afterload 0 130 ml 40 QRS F, I Aortic Pressure Ventricular Pressure Note that aortic pressure is lower than ventricular pressure while blood is exiting the ventricle Ventricular Volume P EKG

  10. AV valves close 120 Semilunar valves open Mm Hg 0 Semilunar valves close 130 ml 40 QRS F, After a period of time the ventricles cease to contract and begin relaxing. When this occurs, the pressure in the ventricles drops below arterial pressure and the aortic and pulmonary valves are pushed shut by backflow of blood into their chambers. Aortic Pressure Ventricular Pressure Ventricular Volume J P EKG

  11. AV valves close 120 Mm Hg 0 Semilunar valves close 130 ml 40 QRS T T J, F, Aortic Pressure Relaxation begins after the T wave of the EKG. With the aortic valve shut, ventricular pressure drops but volume stays constant (isovolemic) because all the valves are closed. Ventricular Pressure Ventricular Volume K P EKG

  12. AV valves close 120 Semilunar valves open Mm Hg 0 Semilunar valves close 130 ml 40 QRS T T J, F, Aortic Pressure When ventricular pressure is less than atrial pressure the AV valves open and blood enters the ventricles which increases their volume. Ventricular Pressure Ventricular Volume L P EKG

  13. AV valves close 120 Semilunar valves open Mm Hg 0 Semilunar valves close 130 ml AV valves open 40 QRS T T J, F, Aortic Pressure Please take note on this panel when the valves open and close and what events are associated with their opening and closing. Ventricular Pressure Ventricular Volume P M EKG

  14. Systole AV valves close 120 Semilunar valves open Mm Hg 0 Semilunar valves close 130 ml AV valves open 40 QRS T T J, F, Aortic Pressure Ventricular systole is that time when the ventricles are contracting and includes the isovolumetric contraction and ejection phases. Ventricular Pressure Ventricular Volume N P EKG

  15. Diastole AV valves close 120 Semilunar valves open Mm Hg 0 Semilunar valves close 130 ml AV valves open 40 QRS T J, F, Aortic Pressure Ventricular diastole is that time when the ventricles are relaxed. Ventricular Pressure Ventricular Volume O P EKG T

  16. Semilunar valves open AV valves close 120 AV valves open Aortic Pressure Left Ventricular Pressure Semilunar valves close Mm Hg Left Ventricular and aortic pressure profiles. 0

  17. Semilunar valves open Pulmonary Artery Pressure Right Ventricular Pressure AV valves close 120 AV valves open Aortic Pressure Left Ventricular Pressure Semilunar valves close Mm Hg 0 Right ventricular and pulmonary artery pressure profiles.

  18. 120 Mm Hg “c” wave (ventricular contraction) “a” wave atrial contraction “v” wave (ventricular filling) 0 Jugular Venous Pressure

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