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6 Cards in this Set
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Na deficit=??
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TBW x (wt kg) (desired Na – pt Na)
TBW = 0.6 male = 0.5 female or elderly for desired Na, correct by 10 |
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Sample Sodium Deficit and Fluid Replacement Calculation
55-year-old male, ideal wt 80 kg, Pt Na = 115 mEq/L Na deficit = |
we want to correct by 10 so desired Na is 125
Na deficit = TBW (wt kg) (desired Na – pt Na) = 0.6 (80) (125-115) = 48 (10) = 480 mEq |
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Example: Patient’s Na is 127, glucose is 700 ****
Corrected Na = ? |
Corrected Na = 1.6 [(700-100) ÷ 100] + 127
= 1.6 [(600) ÷ 100] + 127 = 1.6 (6) + 127 = 9.6 + 127 = 136.6 |
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corrected Na=?
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Corrected Na = 1.6 [(Pt glucose-100) ÷ 100] + pt Na
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when do you calculate a free water deficit? what is the formula?
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when you have hypernatremia
Free Water (L) = TBW (wt kg) [(pt Na ÷ desired Na) – 1] TBW male = 0.6 female, elderly = 0.5 |
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Free Water Calculation
Patient Data: Na 157 Wt 75 kg Age 80 Gender Male Free Water (L)= |
Free Water (L)= TBW (wt kg) [(pt Na/desired Na) – 1]
Free Water (L) = 0.5 (75) [(157/147) – 1] = 37.5 [(1.068) – 1] = 37.5 (0.068) = 2.55 |
