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Afterload graphs

Systemic vascular resistance index (SVRI)

  • If the afterload (SVRI) is increased, the heart must pump with more
  • power to eject the same amount of blood as before.
  • The higher the afterload, the less the cardiac output.
  • The lower the afterload, the higher the cardiac output.

If the afterload exceeds the performance of the myocardium, the heart may decompensate.

Systemic vascular resistance index formula
  1. 1. Gassanov N. et al. The PiCCO catheter. Dtsch med Wochenschr 2010; 135(46): 2311-2314