Friday, February 9, 2018

Undesirable effects of mechanical ventilation

Q: All of the following are the effects of Positive Pressure Ventilation (PPV) except? 

A) Decreased dead space 
B) Reduced intraparenchymal shunt
C) Diaphragmatic dysfunction 
D) Respiratory muscle atrophy 
E) Impaired mucociliary motility

Answer:  A

Prolonged positive pressure ventilation is associated with many undesirable effects including all of the following except choice A. Positive pressure ventilation increases ventilation (V) in alveoli that do not have a corresponding increase in perfusion (Q). It causes increased V/Q mismatch and increased dead space. The ultimate effect could become evident as hypercapnia in Arterial-Blood-Gases (ABGs).

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