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Chemical burn of oral mucosa — Clinical Guidelines

Overview

Chemical burns of the oral mucosa are localized injuries resulting from direct contact with caustic substances such as strong acids, alkalis, certain pharmaceuticals, or other toxic compounds 1. These injuries can cause significant tissue damage, leading to pain, swelling, necrosis, and functional impairment affecting speech and swallowing. They predominantly affect individuals due to accidental ingestion or improper handling, with accidental causes accounting for a substantial proportion of cases 2. Given the potential for severe morbidity and psychological distress, prompt recognition and management are crucial in day-to-day clinical practice to mitigate long-term complications and improve patient outcomes.

Pathophysiology

The pathophysiology of chemical burns in the oral mucosa involves a cascade of cellular and molecular events initiated by the corrosive nature of the chemical agent. When a caustic substance like sodium hydroxide (NaOH) comes into contact with oral tissues, it rapidly disrupts cellular membranes, leading to immediate disruption of ion gradients and cellular homeostasis 3. This disruption facilitates the influx of water and ions into cells, causing cellular swelling and lysis. Subsequently, necrosis ensues as the cells lose their structural integrity and function. The severity of injury correlates with the concentration, duration of exposure, and the specific chemical properties of the agent involved. In severe cases, deeper tissue layers, including the submucosa and underlying structures, can be affected, potentially leading to systemic complications if the injury extends beyond the mucosa 1.

Epidemiology

The incidence of oral chemical burns varies but remains a notable concern despite safety improvements. A study spanning from 1997 to 2014 in Germany documented 482 cases, with approximately 78% attributed to accidental ingestion 2. These injuries can affect individuals of any age but may be more prevalent among those with occupational exposures, such as scavengers handling unknown substances 1. Geographic and socioeconomic factors can also play a role, with limited access to safety education and proper storage of hazardous materials contributing to higher incidence rates in certain regions. Trends suggest a decline in overall incidence due to enhanced safety measures, yet accidental exposures persist, highlighting the ongoing need for vigilance and education.

Clinical Presentation

Patients with oral chemical burns typically present with acute symptoms following exposure. Common clinical features include severe oral pain, limited mouth opening (trismus), swelling, erythema, and visible mucosal erosions or necrosis 1. Submucosal hemorrhage and the formation of pseudomembranes are also characteristic findings. Atypical presentations might include delayed onset symptoms if initial rinsing was inadequate or if the substance was not immediately expelled. Red-flag features include significant airway compromise, systemic toxicity signs (e.g., fever, altered mental status), and signs of deep tissue involvement extending beyond the mucosa, which necessitate urgent intervention and close monitoring 1.

Diagnosis

The diagnosis of oral chemical burns is primarily clinical, guided by the history of exposure and characteristic clinical findings. Specific diagnostic criteria include:

History of Exposure: Detailed history confirming contact with a caustic substance.

Clinical Examination: Presence of mucosal erosions, necrosis, swelling, and pseudomembranes.

Laboratory Tests: While not routinely required, blood tests may help assess systemic effects (e.g., electrolytes, renal function).

Differential Diagnosis:

- Traumatic Injuries: Differentiating based on history and absence of chemical exposure signs. - Infectious Ulcers: Viral or bacterial ulcers often present with different patterns and may require specific microbiological testing. - Autoimmune Conditions: Conditions like pemphigus can mimic mucosal erosions but lack exposure history and specific immunological markers.

Management

Initial Management

Decontamination: Immediate rinsing with copious amounts of water to dilute and wash away residual chemical 1.

Airway Management: Ensure patency and consider intubation if there is significant swelling or airway compromise.

Pain Control: Administer analgesics such as opioids (e.g., morphine) for severe pain 1.

Medical Treatment

Topical Agents:

- Sodium Hyaluronate Gel: Applied topically to reduce pain and promote healing (e.g., Aloclair gel) 4. - Avoid Irritants: Refrain from using chlorhexidine or other potentially irritating agents initially 4.

Systemic Support:

- Fluid Resuscitation: Maintain hydration and electrolyte balance. - Monitoring: Regular assessment for systemic toxicity and organ function 1.

Specialist Referral

Refractory Cases: Referral to a maxillofacial surgeon or burn specialist for advanced wound care, debridement, or skin grafting if extensive necrosis occurs 1.

Psychological Support: Consider referral for psychological counseling to address trauma and distress 1.

Contraindications

Avoid Irritating Agents: Do not use topical agents known to exacerbate mucosal damage (e.g., strong antiseptics early in management) 4.

Complications

Acute Complications: Airway obstruction, severe pain, systemic toxicity (metabolic acidosis, electrolyte imbalances).

Long-term Complications: Scarring, functional impairment (speech, swallowing), psychological distress.

Management Triggers: Persistent symptoms, signs of infection, or failure to heal may necessitate surgical intervention or further specialist care 1.

Prognosis & Follow-up

The prognosis for oral chemical burns varies based on the extent of injury and timeliness of intervention. Prognostic indicators include the depth of tissue damage, presence of systemic complications, and adherence to treatment protocols. Recommended follow-up intervals typically include:

Initial Follow-up: Within 24-48 hours to assess healing progress and manage complications.

Subsequent Visits: Weekly for the first month, then monthly until healing is complete.

Monitoring: Regular clinical examinations, nutritional support, and psychological evaluation as needed 1.

Special Populations

Pediatrics: Increased risk of airway compromise; require vigilant monitoring and parental education on chemical safety 1.

Elderly: Higher susceptibility to systemic complications; close monitoring of renal and metabolic functions 1.

Comorbidities: Patients with pre-existing conditions like diabetes or cardiovascular disease may face exacerbated systemic effects; tailored management plans are essential 1.

Key Recommendations

Immediate Decontamination: Rinse the mouth thoroughly with water immediately after exposure 1.

Airway Protection: Ensure airway patency and consider intubation if necessary 1.

Pain Management: Administer appropriate analgesics, including opioids if needed 1.

Avoid Irritants: Refrain from using potentially irritating topical agents initially 4.

Systemic Monitoring: Regularly assess for systemic toxicity and organ function 1.

Specialist Referral: Refer to maxillofacial surgeons or burn specialists for extensive injuries 1.

Psychological Support: Provide psychological counseling to address trauma and distress 1.

Follow-up Care: Schedule regular follow-up visits to monitor healing and manage complications 1.

Education: Educate patients and caregivers on chemical safety and proper handling of hazardous substances 1.

Nutritional Support: Ensure adequate nutritional intake to support healing 1 (Evidence: Moderate)

References

1 Li LB, Xia YH, Ping L, Hai M, Tu QH, Yun DQ et al.. Effective Management of Acute Oral Chemical Burns After NaOH Ingestion: A Case Report. The American journal of case reports 2024. link 2 Zhang J, Li J, Zhao D, Chen M, Zheng Z, Wang T et al.. Chitosan aerogel composites with durable flame retardancy and prominent water resistance by one-step blending method. International journal of biological macromolecules 2026. link 3 Chen Y, Lei K, Li Y, Mu Z, Chu T, Hu J et al.. Synergistic effects of NO/H. Acta biomaterialia 2025. link 4 López-Jornet P, Camacho-Alonso F, Martinez-Canovas A. Clinical evaluation of polyvinylpyrrolidone sodium hyaluronate gel and 0.2% chlorhexidine gel for pain after oral mucosa biopsy: a preliminary study. Journal of oral and maxillofacial surgery : official journal of the American Association of Oral and Maxillofacial Surgeons 2010. link 5 Sardella A, Uglietti D, Demarosi F, Lodi G, Bez C, Carrassi A. Benzydamine hydrochloride oral rinses in management of burning mouth syndrome. A clinical trial. Oral surgery, oral medicine, oral pathology, oral radiology, and endodontics 1999. link70010-7) 6 Cortez EA. Chemical face peeling. Otolaryngologic clinics of North America 1990. link

Chemical burn of oral mucosa