Patient handout

Deep neck space infection (retropharyngeal / parapharyngeal / Ludwig — airway + sepsis triage, CT space-mapping, IV broad-spectrum ± surgical source control)

PRODUCTION

1. Your condition

This handout is for deep neck space infection (retropharyngeal / parapharyngeal / ludwig — airway + sepsis triage, ct space-mapping, iv broad-spectrum ± surgical source control). Your care team identified this based on: neck swelling / induration with pain, fever, dysphagia, odynophagia and trismus over 1-5 days — the cardinal deep-neck-space-infection presentation (sheikh clin otolaryngol 2023 pmid 37147934; charlton j laryngol otol 2024 pmid 39434660).

Other reasons your team may use this plan: bilateral submandibular brawny induration with floor-of-mouth elevation, tongue protrusion/displacement and drooling — ludwig's angina, a do-not-delay airway emergency (bridwell/long am j emerg med 2020 pmid 33383265; dowdy anesth prog 2019 pmid 31184944); upstream ent engine flagged deep-space / airway red flags and routed in by engine_id (reciprocal entry from ent.pharyngitis.core.v1 / ent.peritonsillar-abscess.core.v1 / ent.epiglottitis.core.v1) (sheikh clin otolaryngol 2023 pmid 37147934); odontogenic (lower-molar / floor-of-mouth), tonsillar/pharyngeal, salivary, foreign-body/instrumentation, or ivdu (jugular-route) source identified or suspected — source-driven deep-space entry (ma j int med res 2019 pmid 31640429 — odontogenic predominance).

2. Your medications

Take these medications exactly as prescribed. Do not stop or change a dose without talking to your provider.

Medication	Starting dose	How	When	What it does
controlled_definitive_airway_flexible_awake_with_surgical_backup	—	—	—	Bridwell/Long Am J Emerg Med 2020 (PMID 33383265) — first-line airway approach is flexible intubating endoscopy with preparation for a surgical airway; Dowdy Anesth Prog 2019 (PMID 31184944) — Ludwig is a predicted difficult airway: do NOT force supine / blind oral intubation; mark external airway landmarks. The controlled-airway algorithm itself is routed to ent.epiglottitis.core.v1.

Plan: Deep neck space infection — airway-secure → surgical source control → IV broad-spectrum (anaerobe + strep + MRSA) + Lemierre anticoagulation branch

4. When to seek emergency care

Call 911 or go to the nearest emergency room right away if you have:

Stridor, "can't lie flat", drooling/pooled secretions, floor-of-mouth elevation with tongue displacement, or rapidly progressive distress — impending deep-neck/Ludwig airway obstruction (Bridwell/Long Am J Emerg Med 2020 PMID 33383265; Dowdy Anesth Prog 2019 PMID 31184944)(life-threatening)
Pleuritic chest/back pain, dyspnoea, widened mediastinum, retropharyngeal/anterior-visceral spread, or very high/rapidly rising CRP (e.g. ~340 vs ~190 mg/L mediastinal vs non-mediastinal) (Hu Medicina 2022 PMID 36556959 — untreated mortality up to 85%)(life-threatening)
Rigors, anterior-neck-vein tenderness/cord, pleuritic chest pain, and septic pulmonary emboli after an oropharyngeal infection — Fusobacterium necrophorum internal-jugular septic thrombophlebitis (Tiwari Cureus 2023 PMID 37724228; Wright South Med J 2012 PMID 22561543)(life-threatening)
Rapidly spreading neck erythema/induration with crepitus, dishwater discharge, pain out of proportion, or cutaneous anaesthesia — cervical necrotising fasciitis (Sheikh Clin Otolaryngol 2023 PMID 37147934 — a recognised DNSI complication theme)(life-threatening)
Carotid-space involvement on CT with a sentinel/herald bleed (oral/aural/wound), expanding pulsatile neck mass, or cranial-nerve palsy — impending carotid blow-out (Sheikh Clin Otolaryngol 2023 PMID 37147934 — carotid-sheath involvement theme)(life-threatening)
qSOFA ≥2, hypotension on adequate fluids, or NEWS2/SIRS-positive systemic toxicity with the deep-neck source (SSC)
≥2 deep neck spaces, or retropharyngeal/prevertebral/anterior-visceral involvement on CT, ± gas formation — the mediastinitis precursor and surgical-drainage indication (Arslan J Investig Med 2022 PMID 35760449 — ≥2 spaces / gas indicate surgical drainage; Hu Medicina 2022 PMID 36556959)

5. Follow-up

Definitive source eradication (dental extraction/endodontics for an odontogenic source, tonsillectomy candidacy if recurrent tonsillar source, salivary-duct management); diabetes optimisation (DM is a recurrence + complication driver — Bandol Medicina 2025); IVDU harm-reduction / addiction referral; ENT/OMFS follow-up; counsel return precautions for re-accumulation, airway, mediastinitis, and Lemierre. Anticoagulation-duration follow-up if a Lemierre IJ thrombus was treated (Adedeji Ann Pharmacother 2020 — 6-12 wk).

6. Sources

Guideline: No single society "deep neck space infection guideline" exists; operating authority set — Sheikh et al systematic review & qualitative evidence synthesis of DNSI assessment/management (Clin Otolaryngol 2023, 60 studies) + Charlton et al UK 53-case DNSI cohort (J Laryngol Otol 2024) + Asairinachan et al Australian 422-patient DNSI cohort (ANZ J Surg 2025) + Arslan et al DNI laboratory/imaging treatment-strategy study (J Investig Med 2022) + Hu et al risk factors for descending necrotising mediastinitis in deep neck abscess (Medicina 2022) + Kim et al optimal airway management in DNM (J Oral Maxillofac Surg 2021) + Ma et al multidisciplinary DNM treatment (J Int Med Res 2019) + Bridwell/Long Ludwig's angina evidence-based review (Am J Emerg Med 2020) + Dowdy et al Ludwig's angina anaesthetic/airway management (Anesth Prog 2019) + Tiwari Lemierre's 21st-century review (Cureus 2023) + Adedeji et al Lemierre anticoagulation systematic review (Ann Pharmacother 2020) + Wright et al Lemierre syndrome (South Med J 2012); all WebSearch/PubMed reconciled 2026-05-17