What are the indications, preparation, and procedural steps for an upper gastrointestinal (GI) endoscopy in an adult?

Upper GI Endoscopy: Indications, Preparation, and Procedural Steps

Upper GI endoscopy (esophagogastroduodenoscopy/EGD) should only be performed when there is an appropriate clinical indication that balances procedural risks against diagnostic or therapeutic benefits, with inappropriate use occurring in over 20% of cases and resulting in lower diagnostic yield. 1

Key Indications for Diagnostic EGD

The most appropriate indications include:

• Dyspepsia unresponsive to medical therapy or associated with alarm features (most common indication, 60-64% of cases) 2, 3
• Upper GI bleeding (hematemesis, melena, or occult bleeding with iron deficiency anemia) 2
• Dysphagia or odynophagia requiring evaluation for structural abnormalities 2
• Persistent gastroesophageal reflux symptoms despite appropriate medical management 2
• Surveillance for malignancy in high-risk conditions (Barrett's esophagus, gastric atrophy/intestinal metaplasia) 1, 2
• Suspected esophageal or gastric neoplasia based on imaging or clinical presentation 2

A critical pitfall: performing EGD for inappropriate indications exposes patients to unnecessary risks and reduces diagnostic yield by 30% (OR 1.42 for appropriate vs inappropriate indications). 1

Pre-Procedure Preparation

Patient Assessment and Risk Stratification

Before scheduling, conduct risk stratification focusing on:

• Cardiovascular status and antithrombotic medication use
• Aspiration risk factors including delayed gastric emptying
• Sedation risk assessment (cardiopulmonary reserve, airway anatomy)
• Mental capacity for informed consent 2, 4

Medication Management

Antithrombotic agents: Follow published GI society guidelines for temporary interruption and resumption—poor compliance with these guidelines increases cardiovascular event risk. 1

GLP-1 receptor agonists: Hold one dose before endoscopy due to delayed gastric emptying and aspiration risk, per American Society of Anesthesiologists guidance. 1

Informed Consent

Written informed consent is legally required and must document risks, benefits, alternatives, and potential complications. 2 Send information and consent forms before the procedure to allow adequate consideration time. 2

Time Allocation

Allocate a minimum 20-minute slot for standard diagnostic endoscopy, with longer times for surveillance or high-risk conditions. 2

Procedural Steps for High-Quality Examination

Equipment and Setup

• Use high-definition video endoscopy systems with image capture and biopsy capability 2
• Complete a safety checklist before starting 2
• Ensure monitoring equipment and emergency supplies are ready 4

Sedation Approach

Intravenous sedation and local anesthetic throat spray (10% xylocaine) can be used in combination, but exercise caution in patients at aspiration risk. 2, 5 Sedation is recommended to enhance detection of superficial neoplasms. 6

Systematic Examination Protocol

A complete EGD must assess all relevant anatomical landmarks and high-risk stations with photo-documentation. 2 The systematic approach includes:

1. Esophagus:

   • Document hiatus hernia presence and size 2
   • Classify Barrett's esophagus using Prague classification 2
   • Use Lugol's chromoendoscopy if squamous neoplasia suspected 2
   • Biopsy grade D or atypical esophagitis with 6-week PPI follow-up 2
   • Take biopsies from two different esophageal regions if dysphagia/food bolus obstruction without alternate cause (to exclude eosinophilic esophagitis) 2

2. Stomach:

   • Biopsy all gastric ulcers and re-evaluate after 6-8 weeks of treatment including H. pylori eradication 2
   • Take separate biopsies from antrum and body if gastric atrophy/intestinal metaplasia suspected 2
   • For iron deficiency anemia investigation, obtain separate antrum and body biopsies 2

3. Duodenum:

   • Complete visualization of duodenal bulb and second portion
   • Obtain biopsies if celiac disease suspected 2

Mucosal Visualization Optimization

Achieve adequate mucosal visualization through air insufflation, aspiration, and mucosal cleansing techniques. 2 Use of antispasmodics and mucolytics enhances visualization. 6

Document the quality of mucosal visualization in the report. 2

Lesion Characterization

When lesions are identified, describe using Paris classification and obtain targeted biopsies. 2 Image-enhanced endoscopy (narrow-band imaging, chromoendoscopy) improves detection and characterization of superficial neoplasms. 1, 6

Inspection Time

Record inspection time for surveillance procedures (Barrett's esophagus, gastric atrophy/intestinal metaplasia surveillance). 2 Sufficient examination time improves detection rates. 6

Post-Procedure Management

• Complete a post-procedure checklist before patient leaves the room 2
• Provide guidance on resumption of antithrombotic medications per published guidelines 1
• Arrange H. pylori testing and treatment when indicated 1
• Schedule appropriate surveillance intervals based on findings 1
• Document all findings, interventions, and follow-up plans clearly 1

Quality Benchmarks

Endoscopists should perform a minimum of 100 EGDs annually to maintain high-quality examination standards. 2 Only endoscopists with appropriate training and relevant competencies should independently perform EGD. 2

The most common pathological findings are gastritis (26-32%), gastroesophageal reflux disease (17%), and gastric ulcers, with normal findings in only 15% of cases. 5, 3