NBME 13,Block 4,q 33 - samideb12

[ArchivalUser]

A 32 years old woman comes to the physician b/c of a one month history of progressive shortness of breath and anxiety.She says that her symptoms become much more pronounced as the day progresses.She is 170 cm(5 ft 7 in) and weighs 70 kg (155lb).BMI is 24 kg/mm2.Breath sounds are normal on ausculation but the pt has difficulty taking a long deep breath .Arterial blood gas analysis on room air shows
pH : 7.33
pCO2:70 mmHg
pO2: 65 mmHg
Pulmonary function test shows a decreased vital capacity ,TV,ERV.Her Residual volume is normal.Which of the following is the underlying cause of this pt's condition?
A.Alpha1 antitrypsin deficiency
B.CNS neoplasm
C.Chronic bronchitis
D.Chronic opiate use
E.Mysthenia gravis
F.Obesity

[ArchivalUser]

i think EEEEEEEEEEee?

[ArchivalUser]

CCC pO2 is decreased

[ArchivalUser]

Its E

[ArchivalUser]

shes not obese though her BMI is within range

i picked C but i read the question again and her symtoms are one month old and for chronic bronchitis cough is at least for 3months to 2 years
so i think maybe its DDD her ph is low acidic

[ArchivalUser]

hi samideb can u please email me the offline nbme13 please residency2013 thanks a lot in advance

[ArchivalUser]

eee

[ArchivalUser]

wats the ans

[ArchivalUser]

E
much more pronounced as the day progresses is the key to diagnose MG
and alsol pattern of PFT shows restrictive

[ArchivalUser]

eeeeee