Peripheral vascular resistance

 

This is the factor that determines the mean arterial blood pressure  for it is mathematically the division of the mean arterial blood pressure with cardiac output. It increases blood pressure if cardiac output is low. Hence blood pressure can be controlled and kept high in conditions of hypovolemic shock in which there may have been severe hemorrhage as in shock. Noradrenalin can be used to increase peripheral vascular resistance which then leads to increase blood pressure.

blood pressure  = Cardiac output   x   peripheral resistance

Peripheral resistance  =  Blood pressure/cardiac output

       

Blood vessels physiology
         

1 isovolumetric contraction 2 ejection 3 isovolumetric relaxation 4 rapid inflow 5 diastasis 6 atrial systole  

 

 

 

 

 

 

 

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