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Pressure-Volume Diagram During the Cardiac Cycle

Changes in Ventricular Volume and Pressure During Different Events in the Cardiac Cycle

Ventricular Filling
  • Volume: Rise

  • Pressure: Initial slight fall and then a slight rise

Isovolumetric Contraction
  • Volume: No change

  • Pressure: Sharp rise

  • Volume: Falls

  • Pressure: Initial rise and then fall

Isovolumetric Relaxation
  • Volume: No change

  • Pressure: Sharp fall

Pressure-Volume Loop

The area covered by the pressure-volume loop represents the net external work output of the ventricle.


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