Behind The Knife: The Surgery Podcast Behind the Knife ABSITE 2025 - Fluids and Electrolytes
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Jan 7, 2025 Explore the essentials of fluids and electrolytes crucial for surgical exams. Learn about total body water distribution and the 4-2-1 rule for maintenance fluid calculations. Discover how to differentiate AKI causes using FENa and FEUrea methods. Navigate hyponatremia treatment strategies and tackle hyperkalemia management with critical ECG findings. Unravel the complexities of acid-base balance and master high-yield electrolyte facts. This informative session equips listeners with key knowledge for exam success!
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Quick Total Body Water Rule
- Calculate total body water as 0.6 × weight (male) or 0.5 × weight (female) in liters.
- Remember two-thirds of TBW is intracellular and one-third extracellular, with one-quarter of that intravascular.
Standard Maintenance Fluids By Age
- Use D5 half-normal saline + 20 mEq K for adult maintenance fluids.
- Pediatrics get D5 normal saline + 20 mEq K and neonates D5 quarter-normal saline + 20 mEq K.
Pick Resuscitation Fluid Carefully
- Choose isotonic crystalloids like LR or NS for resuscitation; LR is more physiologic.
- NS has 154 mEq/L Na and Cl; LR has lower Na/Cl and contains K, Ca, and lactate (bicarbonate precursor).
