What appears to be the major cause of lower respiratory tract infections for patients receiving mechanical ventilation?
A. premorbid lifestyle
B. difficult intubation
C. aspiration
D. airflow obstruction
?ANS: C
A. Incorrect response: See explanation C.
B. Incorrect response: See explanation C.
C. Correct response: For lower respiratory tract infections to occur, the balance between host defenses and microbial propensity for invasion must be shifted in favor of developing pneumonia. The majority of these infections appear to result in aspiration of potential pathogens that have colonized the oropharyngeal airways. Once an adequate concentration of pathogens is present in distal lung tissue and is able to overcome host defenses, pneumonia develops.
D. Incorrect response: See explanation C.
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