Page 1 of 2: physio mock test 44 numercial--double VA

doctorgirl78 · Credits: 5336 My Scrapbook

8) If a person with PAO2 = 125mmHg and PACO2 = 20mmHg doubles VA without changing metabolic rate, PAO2 will become (in mm Hg)
One answer only.
a) 75
b) 110
c) 115
d) 132
e) 138
i do know that all i need is a simple straight formula like the other numericals in the test but somehow it still eludes me...........
actually i am LOST

Bruno · Credits: 44624 My Scrapbook My Reading List 50 Books

By the way what is VA. Kindly enlighten people like us who are not used to abbrevations (VA = Vertebral Artery ??)

A ernest request is to avoid abbrevations except forwellknown abrrevations like IVC, IHD etc

What will you think when someone tells of

MI, Myocardial Infarction or Mitral Incompetence
MS, Mitral Stenosis or Multiple Sclerosis
CBD, Common Bile duct or Continous Bladder Drainage
RTA, Ryles Tube aspiration of Road Traffic Accident

I still remember an Incident during Internship. The Chief had asked the Post gradute to get PCR done for a patient. The PG Duly obliged and the next day in grand rounds it turned out that the chief intended for Protein Creatinine ratio (done in the free hospital lab itself ) and the test done was a not so cheap Polymerase Chain Reaction (Hope you all know how much it costs) in a Private lab. That was a costly mistake. Fortunately for that patient, it was just money that he had to spent (rather than his health which is very costly). Imagine situation like this when we misinterpret a Treatment (rather than an investigation) or do an invasive test for an non invasive one.

That was a unforgettable lesson for me to avoid using abbrevations, unless it is very clear about what is being referred to.

I hope you will take this a clue to minimise (avoiding is not possible) investigations

doctorgirl78 · Credits: 5336 My Scrapbook

hey Bruno...........it was not my doing .i just reproduced the Q as it is.
don't scold me for something i didnt do

i was myself as muddled up but ultimately settled for ventilation.

Bruno · Credits: 44624 My Scrapbook My Reading List 50 Books

I was not scolding you. I was perplexed

at that particular question paper 3 weeks ago. Just letting out what I thought

doctorgirl78 · Credits: 5336 My Scrapbook

where are the knights?/??
for the answer............

akanksha · Credits: 41247 My Scrapbook My Reading List 14 Books

well doc,
this is how i cud solve this....

PAco2=0.863(Vco2/VA)

where,Vco2 is CO2 produced per minute.
VA is ventilation

so,when the ventilation is doubled,
n the metabolic rate remains the same,

dat means,new VA is twice the original VA.
n Vco2 remains same!

by applying above equation,
new PaCo2 becomes half the original Paco2,ie 20 becomes 10. 8)

now,
we all know ths formula,

PaO2=FIo2(Pb-Ph2o)-Pco2/R

so,putting all the constant variables for respiration at sea level,we get a simplified equation-----

PaO2=150-1.25(PaCo2)

now,putting the new PaCo2 in this equation,
we get the answer.

try n see!

do tell me if im wrong sumwhere!

harrision khuda hai!

drmeera · Credits: 616 My Scrapbook

PaO2=FIo2(Pb-Ph2o)-Pco2/R

whats this?

malaydoc · Credits: 618 My Scrapbook

bhai dr. meera ka formulae samajh nahi aya...

jayanta · Credits: 34977 My Scrapbook My Reading List 45 Books

GREAT AKANKSHA

[/b]

drgauravmathur10 · Credits: 201 My Scrapbook

what i have read is that O2 saturation depends on CO2 concentration. if CO2 was 20 orignally and it has reduced to 10 then O2 would increase by 10 and vice versa. Sorry if i am wrong.......

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