Understanding Anesthesiology - The Global Regional Anesthesia ...

Maintenance fluid requirements
Maintenance fluid requirements correlate best with lean body mass and body surface area.
To calculate maintenance, use the “4/2/1 rule”:
First 10 kilograms (i.e. 0-10 kg):! 4 cc/kg/hr
Next 10 kilograms (i.e. 11-20 kg):! 2 cc/kg/hr
All remaining kilograms over 20 kg:! 1 cc/kg/hr
For example, a 60 kg woman fasting for 8 hours:
! 10 kg x 4 cc/kg/hr ! = 40 cc/hr
! 10 kg x 2 cc/kg/hr ! = 20 cc/hr
+ ! 40 kg x 1 cc/kg/hr ! = 40 cc/hr!
! ! ! ! ! = 100 cc/hr x 8 hr
! ! ! ! ! = 800 cc
Therefore, the pre-operative deficit (excluding
other losses) is 800 cc.
Related Glossary Terms
Colloids, Crystalloid, Euvolemia, Pre-operative fluid deficit, Shock, Third space loss
Index
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Chapter 1 - Fluid Management
Chapter 5 - Pediatric Anesthesia
Chapter 5 - Pediatric Anesthesia
Chapter 5 - Pediatric Anesthesia