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USMLE Step 1 Mnemonics Mnemonics, acronyms, reminders, and memorizing tips for the USMLE Step 1.


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Old 01-16-2012
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Show Teeth Acid Base Disorder Mnemonic

trick guys to remember cumbersome acid base values

pH 7.35-7.45

pCO2 35-45 (from above remove 7 and decimal)

pO2 >90 (from above multiply 45 by 2) Normal Values-75-105

HCO3 22 (divide 45 by 2) Normal Values-22-28
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Old 01-16-2012
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Great estimation formula for evaluating acid-base disturbances:

pH=HCO3/co2

get the Normal values from the above post as a baseline and see what makes the pH

7.4=22/40


e.g
low HCO3 = low pH (if CO2 rises = met. acidosis w respiratory compensation)

High CO2 = low ph (if HCO3 lowers = respiratory acidosis w. metabolic compensation)
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Old 01-26-2012
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bump . . . .
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Old 04-23-2012
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Default pH=HCO3/pCO2

Quote:
Originally Posted by DocSikorski View Post
Great estimation formula for evaluating acid-base disturbances:

pH=HCO3/co2

get the Normal values from the above post as a baseline and see what makes the pH

7.4=22/40


e.g
low HCO3 = low pH (if CO2 rises = met. acidosis w respiratory compensation)



High CO2 = low ph (if HCO3 lowers = respiratory acidosis w. metabolic compensation)


Co2 must go down to compensate for met acidosis v. hyperventilationSame here. If pCO2 increases causing respiratory acidosis then HCO3 must increase too to compensate v. metabolic alcalosis


The compensation alawys happen n the same direction
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