148 - respiratory system mcqs - part 7

61q: study the results of the pulmonary function tests shown below ?

predicted FEV1 of 3.5-4.3 but actual FEV1 is 1.2
predicted FVC of 4.6-5.4 but the actual FVC is 4.1
predicted FEV1/FVC is 72-80 % but the actual value is 29 %
predicted PEF is 440-540 but the actual value is 80

the above results are consistent with the disease of ?

a. chronic bronchitis
b. interstitial lung disease
c. pneumonia
d. pneumothorax

answer: a . chronic bronchitis . the parameters indicate that the disease is an obstructive disease and so the answer is chronic bronchitis .

62q: a previously healthy factory worker was found unresponsive in his workplace .he is afebrile anicteric , tachypnoiec , drowsy and blue all over with
clear lung field and hyperdynamic cardiovascular findings.his ABG with 100 % oxygen after intubation was

pH = 7.30
pO2 = 80 mm of Hg
pCO2 = 30 mm of Hg
SaO2 = 50 %

what is the most likely diagnosis

a. methhemoglobinemia
b. adult respiratory distress
c. carbon monoxide poisoning
d. organophosphorous poisoning

answer: c . carbon monoxide poisoning . ( can anyone explain this - please post in comments ) .

63q: consider the following statements . life threatening features of acute severe asthma in children include

1. altered sensorium
2. pulsus paradoxus
3. audible wheeze in both inspiration and expiration
4. oxygen saturation 92-95 %

a. 1 is only correct
b. 1 and 2 are correct
c. 2 and 4 are correct
d. all are correct

answer: b . altered sensorium and pulsus paradoxus .

64q: poor prognostic indicators in acute severe asthma include all of the following except ?

a. pulsus paradoxus
b. hypocarbia
c. use of accessory muscles of respiration
d. PEFR less than 20 % of previous value

answer: b . hypocarbia .

65q: consider the following statements :

early onset extrinsic episodic asthma is characterised by ?

1. family history of eczema or rhinitis
2. development of an early and late asthamtic reaction mediated by mast cells
3. T lymphocytes that release cytokine like interleukin-4

which of the above statements are ture

a. 1,2 and 3 are true
b. 1 and 2 are true
c. 2 and 3 are true
d. 1 and 3 are true

answer: a . all the three statements are true .