ISC ADROGUE MADIAS FORMULA
FREE WATER DEFICIT

from TOUCHCALC



1. Change in Serum Na = (infusate Na - serum Na)/(tbw+1)
2. Change in serum Na = (((Infusate Na + infusate K) - (serum Na) ))/(tbw+1)
Water Deficit (liters) = TBW X ((serum Na/Reference Na)-1)

NOTE: Patients with severe hyponatremia need to be managed in the intensive care unit. Electrolytes need to be checked frequently, and fluids adjusted as needed. Intake and output need to be watched closely. Over correction and osmotic demyelination are serious complications. Consult an nephrologist early. Avoid hypotonic fluids after surgery. Whenever using intravenous solutions, check serum electrolytes daily. Formulas may overcorrect the serum sodium so one must use clinical judgment and monitor the serum sodium, intake and output very closely during the critical period.

TARGET SODIUM CHANGE mmol/L
NUMBER OF HOURS hours
TARGET RATE PER HOUR
INFUSATE SODIUM
INFUSATE POTASSIUM mmol/L
OBSERVED SODIUM mmol/L
PERCENT WATER PATIENT'S WEIGHT kg
TOTAL BODY WATER (TBW) ??? kg
SODIUM CHANGE ??? mmol/L
VOLUME TO INFUSE ??? ml
INFUSION RATE ??? ml/hour
REFERENCE SODIUM FOR CALCULATING FREE WATER DEFICITmmol/L
FREE WATER DEFICIT ??? liters
REFERENCES:

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