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#1
10-05-2012
 USMLE Forums Master Steps History: 1+CK+CS Posts: 851 Threads: 88 Thanked 710 Times in 380 Posts Reputation: 720
Measured Pulmonary Pressure!

UW Q 4713

A 32 year man is intubated and mechanically ventilated after an opioid drug overdose. The ventilator triggers 12 breaths per minute each delivering 500 ml of tidal volume at a flow rate of 6 L/min. You perform an inspiratory hold for 2 seconds following delivery of the tidal volume, and the airway pressure is measured to be 30 cm H2O.

click image to enlarge

The measured pressure reflects which of the following ?

A. Upper airway resistance
B. Total airway resistance
C. Pulmonary compliance
D. Expiratory muscle strenght
E. End-expiratory pressure

Please explain this Question .Thank you
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#2
10-05-2012
 USMLE Forums Master Steps History: 1+CK+CS+3 Posts: 1,216 Threads: 41 Thanked 1,327 Times in 711 Posts Reputation: 1342

Its C, lung compliance is the reverse of elasticity, in other words, that the lung remains open and doesnt collapse and returns to its original position, thats why in the graph it stays the same.. also because the end respiratory maneuver measures specifically this principle as well.
 The above post was thanked by: step_enhancer (10-05-2012)
#3
10-05-2012
 USMLE Forums Master Steps History: 1+CK+CS Posts: 1,867 Threads: 149 Thanked 2,107 Times in 1,049 Posts Reputation: 2127

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 The above post was thanked by: step_enhancer (10-05-2012)

 Tags Pulmonology-, Step-2-Questions

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