**Case 3: Fluid Volume
Calculations**

__ Maintenance__ = [(30 x 4.1) + 70] = 193 ml/day

__ Replacement of dehydration deficit__:

**English Calculation**

0.05 x 9 lb = 0.45 lb of weight loss from dehydration

0.45 lb x 454 ml/lb = 204 ml

**OR**

**Metric Calculation
**0.05 X 4.1 X 1000 = 205 ml

Correction of 80% of dehydration deficit in the first 24 hours:

0.80 x 205 ml = 163 ml

Total fluid requirement for
dehydration plus daily maintenance for the first 24 hours:

193 ml + 163 ml = 356 ml (approximately 14.8 ml/hour)

In this case dehydration should be corrected more rapidly (8 hours) than normal to prevent further renal damage and to differentiate prerenal azotemia (physiological oliguria) from pathological oliguria. Thus, the fluid plan would go as follows:

*First 8 Hours:*

**193/3 = 62 mls for maintenance**

**PLUS**

**163 ml for deficit volume**

**Total volume = 62 + 163 = 225 ml or 28.1 ml/hour**