Aspiration Pneumonitis/Pneumonia - Agency for Healthcare …
Aspiration Pneumonitis/Pneumonia
Diagnosis
? Aspiration pneumonitis is an abrupt chemical injury caused by inhalation of sterile gastric contents. o It can progress quickly to a decline in respiratory status followed by rapid improvement within 48 hours of the insult. o Chest x rays appear similar to multifocal pneumonia.
? Patients with aspiration events are usually unlikely to produce significant sputum, making the utility of sputum cultures low. o Sputum Gram stain and cultures should be considered when the diagnosis is unclear, if purulent sputum is being produced, or if antibiotic treatment is initiated in a hemodynamically unstable patient.
Treatment
? Hemodynamically stable patients with aspiration events o Antibiotics are not warranted, and supportive care is the mainstay of therapy. o Prophylactic antibiotics have not been shown to be helpful in preventing the development of pneumonia after aspiration events.
? Hemodynamically unstable patients with aspiration events o Treat with regimens for community-acquired pneumonia (CAP) (e.g., ampicillinsulbactam, ceftriaxone) if the event occurred within 72 hours of admission to a health care facility. o Treat with regimens for hospital-acquired pneumonia (HAP) (e.g., cefepime, piperacillintazobactam) if the event occurred 72 hours after admission to a health care facility. Coverage for methicillin-resistant Staphylococcus aureus (MRSA) can be considered if the prevalence of MRSA in the hospital is high or the patient has a known history of MRSA colonization or infection, intravenous drug use, a recent stay in a nursing home or skilled nursing facility, prolonged hospitalization with unknown MRSA colonization status, or other risk factors for MRSA o It is not necessary to add additional anaerobic or atypical coverage. o Reassess at 48 hours. If clincial symptoms resolve, antibiotics can be discontinued. If no or minimal improvement and bacterial pneumonia is suspected, treat for 5?7 days.
? Patients with aspiration events not treated initially with no improvement in 48?72 hours o A proportion of patients (20?25%) may develop bacterial pneumonia 48?72 hours after an aspiration event. o If there is no improvement or there is clinical worsening within the first 48?72 hours, consider a course of antibiotic therapy (as above).
References
Bynum LJ, Pierce AK. Pulmonary aspiration of gastric contents. Am Rev Respir Dis. 1976 Dec;114(6):1129-36. PMID: 1008348. Dragan V, Wei L, Elligsen M, Kiss A, Walker SAN, Leis JA. Prophylactic antimicrobial therapy for acute aspiration pneumonitis. Clin Infect Dis. 2018 Feb;67(4): 513-18. PMID 29438467. Murray HW. Antimicrobial therapy in pulmonary aspiration. Am J Med. 1979 Feb;66(2):188-90. PMID: 425963.
AHRQ Pub. No. 17(20)-0028-EF November 2019
Aspiration Pneumonitis/Pneumonia 2
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