Ludwig's Angina
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Direct answer
Ludwig's angina is a rapidly spreading, bilateral cellulitis of the sublingual and submandibular spaces, usually with submental involvement, that elevates the floor of the mouth and pushes the tongue up and back. It usually arises from a mandibular molar, classically the second or third, whose apices lie below the mylohyoid. It is an airway emergency: securing the airway precedes antibiotics, drainage and extraction of the offending tooth.
What you must remember
- Classical definition: bilateral, rapidly spreading cellulitis of the sublingual and submandibular spaces with brawny induration, serosanguinous exudate but little frank pus, no lymphatic involvement and no abscess cavity early.
- Source: odontogenic in the large majority — an infected lower second or third molar, pericoronitis or trauma; uncontrolled diabetes makes the course more aggressive.
- Features: firm brawny bilateral submandibular and submental swelling giving a bull neck, elevated floor of mouth, tongue pushed up and back, drooling, muffled voice, dysphagia, trismus and fever; the patient sits upright and leans forward to protect the airway, and stridor is a late, ominous sign.
- Organisms: mixed aerobic and anaerobic flora — streptococci, staphylococci and oral anaerobes.
- Airway first: involve the anaesthetist early and plan an awake fibreoptic-guided nasal intubation or tracheostomy under local anaesthesia, because forcing these patients supine can precipitate complete obstruction.
- Definitive management: high-dose intravenous antibiotics with anaerobic cover such as penicillin with metronidazole, adjusted to culture; bilateral submandibular incisions draining the spaces even when little pus returns; extraction of the culprit tooth once stabilised; supportive care with monitoring.
- Complications: asphyxia — historically the leading cause of death — septic shock, descending necrotising mediastinitis, jugular thrombophlebitis, empyema and pericarditis.
Common confusion
Ludwig's angina is often treated as an abscess expected to yield pus. It is a cellulitis: the swelling is board-like rather than fluctuant, and surgery returns serosanguinous fluid — decompression relieves pressure and restores perfusion as much as drainage removes infection. The airway is the second confusion: waiting for stridor before involving the anaesthetist is the classical fatal error, since once obstruction is audible both intubation and tracheostomy become far harder.
Exam-focused takeaway
This topic demands correctly ordered management: airway first, then antibiotics, drainage and removal of the cause, one line of justification for each. Define it with the classical descriptors — bilateral, sublingual plus submandibular, cellulitis not abscess — and list the danger signs. Viva questions include why the patient sits forward and why the second and third molars are the usual source. During postings, practise saying the sequence aloud whenever a floor-of-mouth swelling is discussed: assess airway, call for help, sit the patient up, plan the definitive airway, then operate.
Frequently asked questions
Why is the condition called an angina?
From the older sense of angina as strangling or choking — the life-threatening feature is airway compression from below, not pain.
Which teeth most commonly cause it?
The mandibular second and third molars, whose root apices lie below the mylohyoid and infect the submandibular space directly.
Why is little pus found at surgery?
Because it is a cellulitis — a diffuse spreading infection of the spaces rather than a localised collection — though decompression still helps.
What is the safest airway approach in severe cases?
An awake technique — fibreoptic-guided nasal intubation or tracheostomy under local anaesthesia — planned early with an experienced anaesthetist.
What is the most feared complication beyond the airway?
Descending necrotising mediastinitis as infection tracks through the retropharyngeal and danger spaces into the chest, which is why severe cases need chest imaging.