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

#1
01-16-2012
 USMLE Forums Master Steps History: 1+CK+CS Posts: 851 Threads: 88 Thanked 710 Times in 380 Posts Reputation: 720
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
 The above post was thanked by: anoushay khan (01-17-2012), Cal_Tina (01-26-2012), CHAKRAM (01-18-2012), doxorubicin (01-16-2012), dr.maythutun (10-15-2012), DRIBO (02-11-2012), jjsanchezramirez (02-06-2012), king_usmle (04-27-2012), Learner (01-16-2012), muhammad (01-16-2012), Sandipta Mitra (03-02-2013)

#2
01-16-2012
 USMLE Forums Master Steps History: 1+CK+CS+3 Posts: 1,353 Threads: 94 Thanked 877 Times in 507 Posts Reputation: 890

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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#3
01-26-2012
 USMLE Forums Master Steps History: 1+CK+CS Posts: 851 Threads: 88 Thanked 710 Times in 380 Posts Reputation: 720

bump . . . .

#4
04-23-2012
 USMLE Forums Scout Steps History: 1 + CK Posts: 33 Threads: 0 Thanked 6 Times in 4 Posts Reputation: 16
pH=HCO3/pCO2

Quote:
 Originally Posted by DocSikorski 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

 Tags Electrolytes-

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