All of the following are true about aspiration pneumonia except:
(A) Aspiration of 20-30 mL of contents with pH < 2.5 is required (B) Fungal infection is the common cause of pneumonia (C) Posterior segment of the right upper lobe is most commonly affected in the recumbent position (D) Aspiration responsible for 5-15% of community acquired pneumonia
(B) Answer- B.Fungal infection is the common cause of pneumoniaMixed polymicrobial infection involving both aerobes and anaerobes are the common cause of aspiration pneumonia, not the fungal infection.Incidence: It is common and may account for up to 15% of patients with community-acquired pneumonia.Gastric pH of 2.5 or less with a gastric contents volume greater than 25 ml are critical values for causing aspiration pneumonia.The posterior segments of the upper lobe and apical segments of lower lobes are most commonly involved when aspiration occurs in a supine position.The basal segments of the lower lobes are usually affected in patients who aspirate in an upright or semirecumbent position.