Aspiration Pneumonia — SAQ

Stem

A 76-year-old nursing-home resident presents with three days of fever, cough, increasing breathlessness, and new confusion. He had an ischaemic stroke eight weeks ago and needs help with meals. Respiratory rate is 30/min, oxygen saturation is 89% on room air, blood pressure is 102/64 mmHg, and he has a wet voice with poor secretion control. Chest radiography shows new right lower-lobe consolidation. There is no known previous MRSA or Pseudomonas isolate and no recent hospital admission with IV antibiotics.[1][2]

Questions and marking scheme

a) Diagnosis and evidence — 2 marks

1. State the most likely diagnosis. (1 mark)
2. Give two history or examination findings that support aspiration as the mechanism. (1 mark)[1][2]

b) First-hour management — 4 marks

State one action under each heading:[1][2]

1. Immediate stabilisation. (1 mark)
2. Initial investigation or microbiology. (1 mark)
3. Empiric antimicrobial strategy. (1 mark)
4. Swallow and feeding safety. (1 mark)[1][2]

c) Alternative chemical syndrome — 2 marks

If the patient instead developed abrupt hypoxaemia immediately after witnessed vomiting during anaesthesia:[1]

1. Name the syndrome and state the initial antibiotic decision. (1 mark)
2. State how subsequent deterioration should be assessed. (1 mark)[1][2]

d) Two escalation branches — 2 marks

1. What change is required if CT shows a cavitating lesion with pleural infection? (1 mark)
2. Does nursing-home residence alone justify empiric MRSA, antipseudomonal, or carbapenem therapy? (1 mark)[1][2][3][4]

Total: 2 + 4 + 2 + 2 = 10 marks

Model answer

a) Diagnosis and evidence — 2 marks

1. Community-onset aspiration pneumonia. Nursing-home residence does not by itself make this hospital-acquired pneumonia.[2]
2. Supporting findings include post-stroke feeding dependence, wet voice/poor secretion control, and a compatible dependent-lung infiltrate. Any two earn the mark; distribution supports but does not prove aspiration.[1][3]

b) First-hour management — 4 marks

1. Stabilise: perform ABC assessment, give oxygen for hypoxaemia, establish monitoring and IV access, and escalate urgently if airway protection, ventilation, or perfusion is failing.[1]
2. Investigate: obtain severity-directed blood tests and imaging; take blood or respiratory cultures when severe disease or resistant-pathogen risk makes them useful, without delaying urgent antibiotics.[2]
3. Antimicrobials: start the locally recommended CAP regimen, with route determined by severity and ability to absorb. Do not add routine clindamycin or metronidazole and do not broaden solely because the patient lives in a nursing home.[2][3]
4. Swallow safety: withhold unsupervised oral intake and oral medication, arrange a structured swallow assessment, and create an interim hydration, medication, nutrition, positioning, and supervision plan.[1]

c) Alternative chemical syndrome — 2 marks

1. This is aspiration pneumonitis, a chemical injury. If the presentation is convincingly chemical and uncomplicated, provide supportive care and do not give routine prophylactic antibiotics initially.[1]
2. Do not use a fixed 48-hour rule. Reassess serially; if the patient deteriorates or develops a persistent infective picture, obtain appropriate cultures and imaging, reconsider bacterial pneumonia, obstruction, ARDS, oedema, or another diagnosis, and start antibiotics when infection is clinically suspected.[1][2]

d) Two escalation branches — 2 marks

1. Cavitation plus pleural infection requires CT-defined complication review, microbiology, reliable anaerobic-active therapy, pleural drainage/source control, and early respiratory/thoracic input; duration is guided by response rather than an automatic course length.[1][3]
2. No. The HCAP category is retired. Add MRSA or antipseudomonal therapy only for validated patient-specific and local risk; true HAP/VAP follows its own guideline and antibiogram.[2][4]

References

1. [1]Košutova P, Mikolka P. Aspiration syndromes and associated lung injury: incidence, pathophysiology and management. Physiol Res, 2021.PMID 35199544
2. [2]Metlay JP, Waterer GW, Long AC, et al. Diagnosis and Treatment of Adults with Community-acquired Pneumonia. An Official Clinical Practice Guideline of the American Thoracic Society and Infectious Diseases Society of America. Am J Respir Crit Care Med, 2019.PMID 31573350
3. [3]DiBardino DM, Wunderink RG. Aspiration pneumonia: a review of modern trends. J Crit Care, 2015.PMID 25129577
4. [4]Kalil AC, Metersky ML, Klompas M, et al. Management of Adults With Hospital-acquired and Ventilator-associated Pneumonia: 2016 Clinical Practice Guidelines by the Infectious Diseases Society of America and the American Thoracic Society. Clin Infect Dis, 2016.PMID 27418577