Formulas and Numbers Flashcards by kristine galan | Brainscape

Q

Na deficit

A

TBW x (Desired Na - Actual Na)

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Q

Amount of Na in fluids

A

PNSS 154
D5W 0
0.45 NaCl 77
3% NaCl 513

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Q

Plasma Osm

A

2Na + Gluc/18 + BUN/2.8

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Q

Osmolal gap

A

measured Osm - Computed Osm

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Q

Osm Gap > 10

A

Toxins

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Q

FeElectrolyte

A

UrineE x Serum Crea / UCrea x SerumE

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Q

Free water excretion

A

(Una + UK)/Serum Na X UO (L)

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Q

Urine Crea Normal

A

F 15-20 mkd; M 20-25 mkd

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Q

Renal Mg wasting

A

Urine Mg > 24 g/day; FeMg 3-4%

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Q

Renal K Wasting

A

UK> 15; UK/crea > 1.5

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Q

Glucose in PD solution

A

5%: 15-22 g
5%: 24 - 40 g
25%: 45 - 60 g

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Q

steroid equivalent; 1 mg pred

A

dexa 0.2
methlypred 0.8
hydrocort 4
cortisone 5

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Q

AG

A

Na - (Cl + Hco3)

normal 8-12

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Q

Corrected AG

A

AG - [(4.5-Alb) x 2.5]

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Q

UAG

A

UNa + UK - UCl

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Q

Positive UAG

A

RTA Type 1, 4, renal failure

Q

Hco3 deficit

A

(Desired - Actual) x 0.5 x wt

Q

K deficit

A

Desired - Actual/0.27 x 100

Q

TTKG

A

UK x POsm/PK x UOsm

Q

TBW deficit

A

140-PNa/140 x TBW factor x wt

M: 0.6, F 0.5

Q

Compensation for Respiratory acidosis

A

Acute: Dhco3 = 0.1 (DPco2)
Chronic: Dhco3 - 0.2 (Dpco2)

Q

Compensation for Respiratory alkalosis

A

Acute Dhco3 = 0.2 (DPco2)

Chronic DHco3 = 0.5 (DPCo2)

Q

Compensation for Met Acid

A

Pco2 = 1.5(HCO3) + 8

Q

Compensation for Met Alk

A

Pco2 = 0.5 (HCO3)

Q

FeMg

A

UMg x PCrea / (0.7 x PMg x UCr)

Q

DAG > DHco3 or DAG/DHCO3 > 1

A

metabolic alk + HAGMA

Q

DAG < DHCO3 or DAG/DHCO3 < 1

A

HAGMA + NAGMA

Q

DAG/DHCO3 = 1

A

pure HAGMA

Q

DAG/DCl > 1

A

NAGMA + metalk

Q

DAG/DCl < 1

A

NAGMA + HAGMA

Q

DAG/DCL =1

A

pure NAGMA

Q

Crcl cockroft

A

(140-age) x wt/crea x 72

F x0.85