Aspiration pneumonia in a trauma case

Case contributed by Dr Dayu Gai

Presentation

This 18 year old male was a front passenger when his car was hit a stationary pole. The passenger was ejected from the car, lost consciousness and was intubated while in the ambulance. A CT trauma series was performed.

Patient Data

Age: 18
Gender: Male
Modality: CT
  • Left posterobasal lung collapse/consolidation may be secondary to aspiration pneumonia. Minor atelectactic changes in the right lung. Periportal oedema secondary to rehydration. Endotracheal tube is in situ.
  • No mediastinal haematoma or great vessel injury identified. No pneumothorax, sternal, rib, acetabular or clavicular fracture identified. The liver, spleen, pancreas, kidneys and adrenals are within normal limits. No bowel injury identified. No free intra-abdominal fluid or gas.

Case Discussion

Aspiration pneumonia is defined as a lower respiratory tract infection, due to the aspiration of oral bacterial flora. Trauma patients are at a particular high risk of aspiration pneumonia because they tend to have full stomachs and impaired airway reflexes.

Aspiration pneumonia secondary to trauma is associated with poor outcome, although it is unclear whether this is causation or correlation. The first view is that aspiration is a major preventable factor in the majority of trauma cases2,3. The second view is that aspiration tends to occur in those with severe neurological injury, and these patients are more predisposed to morbidity and mortality4. The corollary of this theory is that patients who were always going to have a poorer outcome will tend to also have aspiration pneumonia.

In one prospective study5, aspiration pneumonia more frequently presented as a bronchopneumonia type pattern with a posterior lung predominance. This is consistent with the case report here demonstrating posterobasal lung collapse.

The management of aspiration pneumonia is with antibiotics. The Australian Antibiotic Therapeutic Guidelines emphasis anaerobic and aerobic sources of infection contributing to aspiration pneumonia. The suggested antibiotic cover is with benzylpenicillin and metronidazole.

Case contributed by A/Prof. Pramit Phal.

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Case Information

rID: 30865
Case created: 7th Sep 2014
Last edited: 27th Apr 2016
System: Chest
Inclusion in quiz mode: Included

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