urgent please getting confused

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urgent please getting confused

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6 Posts

p2
Forum Senior

Topics: 40
Posts: 51

01/20/08 - 01:28 AM

aspirin toxicity mixed disorder
1 ph 7.36 pco2 22 hco3 12
2 ph 7.29 35 14
3 7.45 30 20
ans 1 please explain approach &ruling out others

drshvetasm
Forum Elite

Topics: 22
Posts: 274

01/20/08 - 09:34 AM

Aspirin toxicity is explained very well in usmle world and kaplan notes. i personally do aspirin toxicity questions by ruling out wrong options...it takes longer but its like a double check.

aspirin toxicity has 2 components...initial hyperventilation due to respiratory centre stimulation and resulting respiratory alkalosis and second state of metabolic acidosis...so u have to look for the option with near about normal ph...coz its mix of alkalosis and acidosis. and u have to look for low pco2 due to hyperventilation and low bicarb due to acidosis...so the correct answer is 1.

2. has slightly low pco2 and low bicarb but the low pco2 here can be called compensatory. in aspirin toxicity the pco2 is lower than expected for compensation...

smalley
Forum Elite

Topics: 51
Posts: 284

01/20/08 - 04:25 PM

i will go for 1
aspirin toxicity causes both repiratory alkalosis an met acidosis so ph should be somewhere near normal
3 is not rt since in met acidosis ph should be low pco2 an hco3 are low but ph is not
2 is met acidosis
whats the answer?

___________________
But they that wait upon the LORD shall renew their strength; they shall mount up with wings as eagles; they shall run, and not be weary; and they shall walk, and not faint-Isaiah 40:31

smalley
Forum Elite

Topics: 51
Posts: 284

01/20/08 - 04:31 PM

smalley wrote:
i will go for 1 aspirin toxicity causes both repiratory alkalosis an met acidosis so ph should be somewhere near normal it cant be overcompensated
3 is not rt since in met acidosis ph should be low pco2 an hco3 but here hco3 is normal
2 is met acidosis
whats the answer?

___________________
But they that wait upon the LORD shall renew their strength; they shall mount up with wings as eagles; they shall run, and not be weary; and they shall walk, and not faint-Isaiah 40:31

p2
Forum Senior

Topics: 40
Posts: 51

01/20/08 - 08:02 PM

if u have to consider near normal ph why not 3 ption

Edited by p2 on 01/20/08 - 08:16 PM

hero
Forum Elite

Topics: 36
Posts: 388

01/20/08 - 09:01 PM

body is never overcompensate

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