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16 Cards in this Set
- Front
- Back
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Net ultrafiltration pressure
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Clearance
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Glomerular filtration rate
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Renal plasma flow
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Renal blood flow
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Filtration Fraction
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Filtered load
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Filtered Load = GFR x plasma concentration
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Body fluid compartments
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60-40-20 Rule
Total Body Water = 60% of body weight ICF = 40% (or 2/3 of TBW) ECF = 20 (or 1/3 of TBW) ECF = 15% Interstial fluid 5 % Plasma |
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Creatinine Clearance
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Ccr = [Ucrt (mg/dL) * V (ml/min)]/Pcrt (mg/dL)
1440 min = 24 hrs |
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Fractional Excretion of Sodium
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FEna = (Una/Pna)/(Ucrt/Pcrt) x 100%
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GFR estimate when GFR is low
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(Ccr + Curea)/2
C = clearance |
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Osmolar gap
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1. Calculate osmolarity = 2(na) + BUN/2.8 + glucose/18
2. Osmolar gap = measured osm - calculated osm 3. osmolar gap > 20 with high anion gap metabolic acidosis: ASSUME methanol or ethylene glycol toxicity and Tx w/ EtOH or fomepizole |
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Anion gap
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(Na+) - (Cl- + HCO3-)
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Urinary anion gap
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urinary (Na + K) - Cl
Normal renal response to acid: an abundance of chloride is excreted (NH4+Cl-) and UAG IS NEGATIVE Impaired renal response: POSITIVE UAG |
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Delta gap
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Only use w/ high AG metabolic acidosis
1. calculate AG 2. calculate delta gap: calc. gap - normal gap (12) = 24 it is soley an AG metabolic acidosis <24 a normal gap metabolic acidosis is also present >24 metabolic alkalosis is also present |
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Winter's formula
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To check for compensation in metabolic acidosis
expected pCO2 = (1.5 x HCO3) + 8 |
