Most common cause of hypercapnic respiratory failure: March 2011,’Parch 2013 (a, b, h)
Correct Answer: COPD
Description: Ans. C: COPD Causes of type II (hypercapnic) respiratory failure: Chronic causes: COPD, sleep apnea, kyphscoliosis, myopathies/ muscular dystrophies, ankylosing spondylitis; Acute causes: Acute severe asthma (NOT acute asthma), acute exacerbation of COPD, upper airway obstruction, narcotic drugs etc. Type II respiratory failure: Reduced PaO2 Increased PaCO2 Normal P(A-a)O2 Hypoxemia with increased PaCO2 Type I respiratory failure: Reduced PaO2 Normal/ decreased PaCO2 INcreased P(A-a)O2 Hypoxemia with decreased PaCO2
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