Odontogenic infection with trismus and dysphagia in a 38-year-old
A 38-year-old woman presents with a 5-day history of pain from a lower right molar, now with swelling of the right submandibular region, fever, and difficulty swallowing. She has a temperature of 39.2°C, pulse 112/min, BP 100/65 mmHg, and respiratory rate 24/min; SpO2 is 96% on room air. She has trismus with mouth opening of 18 mm, a raised floor of mouth on the right, drooling, and a muffled voice. Random capillary glucose is 18 mmol/L. The dental clinic has no maxillofacial surgeon on site and no intensive care beds; the nearest maxillofacial unit is 2 hours away by road. The clinic can give intravenous antibiotics, fluids, and oxygen, and can call an ambulance. The patient is frightened and asks for the tooth to be extracted immediately to 'let the pus out'.
1. What are your immediate priorities, and why is extraction not the first step?
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The immediate priority is airway assessment and urgent transfer, not extraction. The combination of trismus, dysphagia, drooling, a raised floor of mouth, and a muffled voice suggests a spreading submandibular infection with impending airway compromise, consistent with Ludwig's angina. Extraction in a dental clinic would be dangerous because it could worsen swelling, bleeding, or airway obstruction, and it does not drain the fascial spaces.
Priorities:
- Airway: sit her upright, give oxygen, monitor SpO2 and respiratory rate, and call for emergency transfer immediately. Do not sedate her or lay her flat.
- IV access and fluids: treat hypotension and dehydration.
- IV antibiotics covering oral anaerobes and streptococci, for example amoxicillin-clavulanate plus metronidazole, according to local protocol.
- Glucose control: a random glucose of 18 mmol/L suggests undiagnosed or poorly controlled diabetes, which worsens infection; check ketones and arrange medical review.
The tooth is the source, but the life-threatening problem is the fascial space infection and airway risk. Definitive dental treatment comes after airway security and surgical drainage.
2. What would you do if her oxygen saturation fell to 90% while waiting for the ambulance?
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A fall to 90% is an airway emergency. I would call for help, keep her upright, and give high-flow oxygen while preparing for urgent transfer. I would not attempt to lie her flat or sedate her, because both can precipitate complete obstruction. If trained staff and equipment are available, I would prepare for airway support, but in a dental clinic without anaesthetic cover the safest action is to expedite transfer and alert the receiving maxillofacial or anaesthetic team that the airway is deteriorating.
I would also check whether the oxygen mask is properly positioned, reassess respiratory rate and consciousness, and avoid any procedure in the mouth that could provoke bleeding or further swelling. If she becomes unresponsive or stops breathing, basic airway manoeuvres and bag-valve-mask ventilation should be started while awaiting the ambulance. The key judgement is that falling saturation changes the situation from urgent transfer to a potentially imminent airway obstruction, so the ambulance control centre and receiving hospital must be told immediately.