DrVirgo
Forum Hero
Topics: 1085
Posts: 3,476
|
80. A healthy 24 year old woman decides to take a skiing vacation in the Swiss Alps. She takes a ski lift to the top of the mountain, where the barometric pressure is 347 mmHg. When she arrives at the top of the mountain, her alveolar PCO2 is 30 mmHg. If she now voluntarily doubles her alveolar ventilation and her respiratory exchange ratio is 1, her alveolar PO2 would be
A. 12 mmHg
B. 33 mmHg
C. 48 mmHg
D. 78 mmHg
E. 96 mmHg
(Please explain or work out calculation.)
Thanks.
___________________
Our greatest glory is not in never falling, but in rising every time we fall.
|
| ralux
Forum Senior
Topics: 5
Posts: 59
|
C
PA O2=PiO2-PA CO2
Pi O2= FO2(patm-47)
PAO2= (Patm-47) FO2 - PACO2=300x0.21-15=48
|
| robin082006
Forum Hero
Topics: 471
Posts: 5,125
|
Excellent Ralux
___________________
The Key to Succeed is Patience.
|
| DrVirgo
Forum Hero
Topics: 1085
Posts: 3,476
|
You are right.
For PCO2 given in q is 30mmHg
Since she doubled her alveolar ventilation, the new PCO2 would be 15 as you used in your calculation; am i correct in making this asumption?
Thanks again for the explanation.
___________________
Our greatest glory is not in never falling, but in rising every time we fall.
|
| ralux
Forum Senior
Topics: 5
Posts: 59
|
yes, thats correct
|
| DrVirgo
Forum Hero
Topics: 1085
Posts: 3,476
|
thanks again. 
___________________
Our greatest glory is not in never falling, but in rising every time we fall.
|
| truedeam59
Forum Elite
Topics: 29
Posts: 145
|
great job
|
|
| |
| | | | | | | |
