Scenario: Nurse call you as patient 's SVRI (Systemic Vascular Resistance Index) is only 372. As you asked further hemodynamics data, you were given following info:
MAP (Mean Arterial Pressure) = 80 ,
CI (Cardiac Index) = 4.0,
CVP = 10
What what be your response?
- Do Nothing - you are happy with this number
- Recalibrate and recheck the SVRI again as it appears to be an error.
- Titrate the vasopressor up.
- Give fluid.
- Give Lasix.
Answer: B
This is probably an error as formula for SVRI is
SVRI = (MAP - CVP) / CI x 80
so SVRI in above case should be:
(80 - 10)/4 x 80 = 1400
Objective of above question is to emphasize the point that, with high dependence on technology and computer chips, errors are common and its very important to obtain full picture when things appear out of normal for no reason and does not fit with full picture. It is more important to know "What not to do" than to know "what to do" !
It is very frequent in board exams to have questions with objective to identify erroneous data !
