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Ventricular Pressure During Cardiac Cycle



Pressure Change During Different Phases of Cardiac Cycle

Isovolumetric Contraction

  • Ventricles contract as close chambers → sharp rise in pressure.

Outflow (Ejection Phase)

  • Initially, ventricles continue to contract forcefully → rise in pressure → pressure reaches maximum.

  • Then ejection is slowed down → pressure falls.

Isovolumetric Relaxation

  • Ventricles relax as closed chambers → sharp fall in pressure.

Inflow

  • During rapid ventricular filling phase → ventricles are relaxing → fall in pressure.

  • With continued filling of ventricles with blood → pressure starts rising.

  • Atrial systole → pumps blood into ventricles → rise in pressure.

Pressure in Left vs Right Ventricles

  • During cardiac cycle, similar events occur in both ventricles → type of Pressure changes are similar in both ventricles.

Wall of left ventricle is thicker

↓

generate more pressure as compared to right ventricle

↓

Pressure in left ventricle is higher than that in right ventricle at any point during cardiac cycle. e.g. maximum pressure in...

left ventricle is 120 mmHg,

right ventricle is 25 mmHg.

 

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