f****i
发帖数: 129 | 1 24. A 49-year-old man has had progressive shortness of breath over the past
year. He now has dyspnea after walking up one flight of stairs. He has fine
crackles bilaterally on auscultation of the lungs. Spirometry shows:
Vital capacity (VC) decreased
FEV1 decreased
Ratio of FEV, to VC increased
Arterial blood gas analysis on room air:
pH 7.42
PCO2 60 mm Hg
PO2 34 mm Hg
Which of the following is the most likely diagnosis?
0 A) Asthma
p B) Bronchiectasis
o C) Chronic bronchitis
p D) Emphysema
p E) Pulmonary fibrosis
I chosed E, but does it cause high CO2??? | d**u
发帖数: 278 | 2 resctrictive lung disease=fribrosis=diffusion problem=decrease O2, increase
CO2 | R**U
发帖数: 420 | 3 I think you ask a very good question. ABG here is weird and only wants to
make you confused.
In restrictive lung disease, PCO2 is generally decreased. It starts to
increase in very late phase.
From ABG here, there must be metabolic alkolosis component since PH is
higher than 7.40. Body can't overcompensate respiratory factor to PH higher
than 7.40. Of course we need HCO3- to confirm if it is a mixed condition or
not.
But just for this question, don't even have to see ABG. They are testing
about different types of Lung Function test. | f****i
发帖数: 129 | 4 good explanation. Thanks so much!
higher
or
【在 R**U 的大作中提到】
: I think you ask a very good question. ABG here is weird and only wants to
: make you confused.
: In restrictive lung disease, PCO2 is generally decreased. It starts to
: increase in very late phase.
: From ABG here, there must be metabolic alkolosis component since PH is
: higher than 7.40. Body can't overcompensate respiratory factor to PH higher
: than 7.40. Of course we need HCO3- to confirm if it is a mixed condition or
: not.
: But just for this question, don't even have to see ABG. They are testing
: about different types of Lung Function test.
| f****i
发帖数: 129 | 5 Hi RICU, I have a question: in respiratory acidosis, can metatolic
compensation overcompensate to a ph greater than 7.4?
or overcompensation can change a primary acidosis state (<7.4) to a
alkalosis satae(>7.4), or vise versa？
higher
or
【在 R**U 的大作中提到】
: I think you ask a very good question. ABG here is weird and only wants to
: make you confused.
: In restrictive lung disease, PCO2 is generally decreased. It starts to
: increase in very late phase.
: From ABG here, there must be metabolic alkolosis component since PH is
: higher than 7.40. Body can't overcompensate respiratory factor to PH higher
: than 7.40. Of course we need HCO3- to confirm if it is a mixed condition or
: not.
: But just for this question, don't even have to see ABG. They are testing
: about different types of Lung Function test.
|
|
