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PRACTICE TESTS FACTOIDS > equatios > Flashcards

equatios Flashcards

1
Q

normal AG

A

8-12

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2
Q

stool osmotic gap

A

290-2(stool Na+stool K)

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3
Q

how to interpret stool osmotic gap

A

under 50 is secretory, over 100 is osmotic

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4
Q

causes of secretory diarrhea

A

bacterial toxins, VIPoma, gastrónoma, thyroid medullary cancer

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5
Q

causes of osmotic diarrhea

A

celia, whipple, pancreatic insufficiency, laxative abuse, lactose intolerance aka malabosprtion

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6
Q

SAAG calculate

A

serum albumin- ascites albuin

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7
Q

interpreting SAAG

A

<1.1 is NOT related to portal HTN, >1.1 is portal HTN

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8
Q

4 causes of SAAG <1.1

A

nephrotic TB malignancy, peritoneal carcinomatosis

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9
Q

causes of SAAG >1.1

A

pre sinusoidal (splenic v or portal v thrombosis, schistosomiasis) sinusoidal (cirrhosis ) and post sinusoid (R heart failure budd chair, constrictive pericarditis)

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10
Q

serum osm formula

A

(2*serum Na) + (BUN/2.8)+ (glucose/18)

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11
Q

osmolol gap

A

measured- calculated

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12
Q

normal osmolol gap

A

under 10

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13
Q

what could cause a high osmolol gap

A

mannitol, ethylene glycol, sorbitol, PEG< methanol

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14
Q

how to calculate water deficicit

A

total body water * ((serum Na/140)-1)

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15
Q

what is total body water

A

60% of total body weight

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16
Q

corrected calcium formula

A

measured calcium + (0.8)(4-albumin)

17
Q

corrected Na formula

A

measured Na+ 0.016 (Glucose-100)

18
Q

winters

A

expected PCo2 = 1.5 (HCO3)+ 8 +/- 2

19
Q

Aa gradient

A

PAo2-Pao2= Pio2- (PaCO2/0.8)-PaO2

20
Q

how to calculate PiO2

A

(Patm-47)* FiO2

21
Q

what is PiO2 on RA at sea level

A

150

22
Q

minute ventilation

A

tidal volume * RR

23
Q

3 causes of elevated AA gradient

A

VQ mismatch, diffusion limited, R to L shunt

24
Q

FENa formula

A

100* (ScrUna)/(SnaUcr)

25
Q

how to interpret FENa

A

< 1%= pre renal, >1% is intrinsic renal

26
Q

delta delta formula

A

change in AG/ change in HCO3

27
Q

when to use Delta delta

A

in high anion gap metabolic acidosis

28
Q

delta delta should = what if complicated by an alkalosis

A

over 2

29
Q

delta delta <0.4 means

A

high Cl normal anion gap metabolic acidosis

30
Q

normal high anion gap metabolic acidosis (pure) means delta delta of what

A

1-2

PRACTICE TESTS FACTOIDS (10 decks)

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