Study sheet: Gastroesophageal Reflux Disease

📋 Course Outline

1. Definition and General Features
2. Reflux Pathophysiology
3. Epidemiology
4. Clinical Presentation
5. Diagnostic Investigations
6. Clinical Forms and Differential Diagnosis
7. Course and Complications
8. Treatment Strategies

📖 1. Definition and General Features

🔑 Key Concepts & Definitions

• Gastroesophageal reflux : the involuntary passage, without vomiting effort, of gastric contents into the esophagus through the cardia

★ Must-know

📌 Gastroesophageal reflux is physiological after meals but becomes pathological when it is associated with symptoms and/or esophageal mucosal lesions.

• Gastroesophageal reflux affects 34–40% of the population according to reflux questionnaires.

Further detail

• Gastroesophageal reflux is diagnosed clinically and with endoscopy, pH monitoring, or pH-impedance monitoring, and is treated with proton-pump inhibitors, H2 antagonists, alginates, and lifestyle measures.

• Surgical treatment is a second-line option, and 30–42% of patients do not respond to proton-pump inhibitors and therefore have proton-pump-inhibitor-refractory reflux.

💡 Memory Hook

Physiological after meals, pathological with symptoms or mucosal lesions

📖 2. Reflux Pathophysiology

★ Must-know

• The main pathophysiological mechanism is incompetence of the antireflux barrier, involving transient lower esophageal sphincter relaxation, increased abdominal pressure, or, rarely, permanent sphincter hypotonia.

• Esophageal clearance depends on:

  • gravity
  • peristaltic movements of the esophageal body
  • saliva containing bicarbonate ions

• Reflux can impair esophageal peristalsis, either primarily or secondarily to esophagitis, while hydrogen ions and pepsin contribute to the aggressiveness of the refluxate.

• The duration of esophageal exposure to acid conditions the development of esophagitis.

Further detail

• Anatomical factors include impairment of the fixation mechanisms of the cardio-tuberosity region and sliding hiatal hernia.

💡 Memory Hook

Barrier failure and impaired clearance → prolonged acid exposure and esophagitis

📖 3. Epidemiology

★ Must-know

• Gastroesophageal reflux affects approximately one in four adults.

• Esophagitis occurs in 20–50% of patients with gastroesophageal reflux, with frequency increasing with age.

📌 Hiatal hernia is neither necessary nor sufficient for gastroesophageal reflux.

Further detail

• The sex ratio for gastroesophageal reflux is approximately two to three men for one woman.

• Approximately 80% of patients do not consult and self-medicate, producing an iceberg effect in the observed disease burden.

💡 Memory Hook

An iceberg: many patients self-medicate without consulting

📖 4. Clinical Presentation

🔑 Key Concepts & Definitions

• Heartburn : an ascending retrosternal burning pain that starts in the epigastrium, often occurs after meals, and is frequently triggered by bending the trunk forward

★ Must-know

• Regurgitation is a burning sensation in the mouth, with or without heartburn, often occurring on waking in the morning.

• Atypical extra-digestive manifestations include:

  • asthma
  • nocturnal positional cough
  • recurrent bronchopulmonary disease
  • dysphonia
  • laryngeal paresthesias
  • pseudo-anginal pain
  • recurrent dental caries

• Alarm signs requiring endoscopy include: age over 50 years, gastrointestinal bleeding, iron-deficiency anemia, dysphagia, weight loss or deterioration in general condition, odynophagia, a family history of esophageal cancer

Further detail

• Typical symptoms occur in about 50% of patients and have high specificity but are not constant.

💡 Memory Hook

Typical symptoms suggest reflux, whereas alarm and atypical symptoms require broader evaluation

📖 5. Diagnostic Investigations

🔑 Key Concepts & Definitions

• Barrett esophagus : metaplasia in which the normal squamous mucosa of the distal esophagus is replaced by glandular mucosa

★ Must-know

• Upper gastrointestinal endoscopy:

  • confirms reflux when esophagitis is present
  • detects Barrett esophagus
  • detects junctional ulcer
  • detects peptic stenosis
  • detects distal esophageal cancer
  • excludes other gastroduodenal disease
  • identifies hiatal hernia
  • permits biopsies

• Endoscopy is normal in 50% of cases, which does not invalidate the diagnosis of gastroesophageal reflux.

• Esophageal pH monitoring detects acid reflux, while pH-impedance monitoring detects liquid and gaseous reflux, both acidic and non-acidic, and measures proximal extension and bolus contact time.

• An abnormal pH study is defined by total acid exposure above 5%, a symptom index above 50%, or a symptom-association probability above 95%.

Further detail

• Ambulatory esophageal pH monitoring may be performed for 24 hours with a catheter or 48 hours with a wireless capsule, and is performed without proton-pump inhibitors because yield is very low under treatment.

• Esophageal manometry diagnoses esophageal motor disorders, while contrast examination may show stenosis or hiatal hernia and ultrasound is used in children.

💡 Memory Hook

Endoscopy → pH monitoring → impedance monitoring → manometry

📖 6. Clinical Forms and Differential Diagnosis

★ Must-know

• During pregnancy, gastroesophageal reflux is promoted by hormonal relaxation of the lower esophageal sphincter and mechanical factors.

• In scleroderma, severe gastroesophageal reflux is related to permanent lower esophageal sphincter hypotonia and absence of contractions in the esophageal body.

• Differential diagnosis includes:

  • other causes of epigastric pain
  • other causes of respiratory symptoms
  • other causes of ear-nose-throat symptoms
  • constrictive chest pain
  • other causes of esophagitis
  • other causes of stenosis

Further detail

• In infants and children, gastroesophageal reflux may present with extra-digestive manifestations and sudden death in the newborn.

💡 Memory Hook

Infant, pregnancy, and scleroderma forms have distinct mechanisms; mimics must be excluded

📖 7. Course and Complications

★ Must-know

• Esophagitis occurs in 20–50% of cases, is non-progressive without complications in 75% of affected patients, and may complicate gastroesophageal reflux.

• Reported complications include: peptic stenosis in 4–20% of cases, Barrett esophagus in 4–10% of cases, ulcer in 5% of cases, bleeding with iron-deficiency anemia in 2% of cases

Further detail

• Barrett esophagus may be associated with ulcer and esophageal adenocarcinoma.

💡 Memory Hook

Reflux → esophagitis → stenosis, Barrett esophagus, ulcer, bleeding, or adenocarcinoma

📖 8. Treatment Strategies

★ Must-know

• Initial lifestyle treatment includes: postural measures, reduction of obesity, avoidance of foods that influence the lower esophageal sphincter, avoidance of medications that influence the lower esophageal sphincter

• Alginates relieve symptoms, prokinetics increase lower esophageal sphincter tone, promote peristalsis, and accelerate gastric emptying, and antisecretory drugs include H2 antagonists and proton-pump inhibitors.

• H2 antagonists achieve approximately 50% healing after 4–8 weeks, whereas proton-pump inhibitors achieve 70–85% healing after 4–8 weeks.

• Surgical treatment reinforces the antireflux barrier by repositioning the lower esophageal sphincter in the abdomen and creating an antireflux mechanism, using complete Nissen fundoplication or partial Toupet hemifundoplication.

📌 Typical symptoms without alarm signs in patients under 50 years are managed according to symptom frequency with lifestyle measures, alginates, prokinetics, H2 antagonists, or proton-pump inhibitors, whereas alarm signs or age over 50 years require endoscopy.

📌 For severe esophagitis, proton-pump inhibitors are prescribed for 6–8 weeks with endoscopic control at the end of treatment, while extra-digestive manifestations require proton-pump inhibitors for 8–12 weeks.

Further detail

• Surgical failure is possible in 10% of patients at 5 years, and preoperative assessment includes pH monitoring and manometry.

📌 In frequent recurrences, long-term maintenance with a half-dose proton-pump inhibitor or surgery may be considered, whereas spaced recurrences may be treated on demand.

📌 Peptic stenosis is treated with proton-pump inhibitors and endoscopic dilation, with possible surgery in a young operable patient, while Barrett esophagus requires endoscopic surveillance and surgery if dysplasia is present.

💡 Memory Hook

Lifestyle measures → medical treatment → surgery when failure or selected indications persist

📊 Synthesis Tables

Main Diagnostic Tests

Test	Main contribution	Key findings
Endoscopy	Visualizes mucosa and complications	Esophagitis, Barrett esophagus, ulcer, stenosis, cancer, hiatal hernia
pH monitoring	Measures acid reflux	Acid exposure above 5% or symptom association
pH-impedance monitoring	Detects acid and non-acid reflux	Liquid, gaseous, mixed, and proximal reflux
Manometry	Evaluates motility	Esophageal motor disorders