DEFINITION & EPIDEMIOLOGY
- Gastroesophageal Reflux (GER): Involuntary, physiologic retrograde passage of gastric contents into esophagus with or without regurgitation/vomiting.
- Gastroesophageal Reflux Disease (GERD): GER leading to troublesome symptoms or complications (esophagitis, nutritional compromise, respiratory disease).
- Epidemiology:
- Physiologic GER peaks at 4 months; resolves in 88% to 95% of infants by 12–24 months.
- GERD incidence in children 0-18 years estimated at 0.84 per 1000 person-years.
- High-Risk Populations: Neurologic impairment (e.g., cerebral palsy), obesity, repaired esophageal atresia (EA), hiatal hernia, cystic fibrosis (CF), prematurity, family history.
PATHOPHYSIOLOGY
- Anti-Reflux Barrier Failure: Dysfunction of lower esophageal sphincter (LES), diaphragmatic pinchcock, and angle of His.
- Transient Lower Esophageal Sphincter Relaxation (TLESR): Primary mechanism. Simultaneous relaxation of LES and crura, independent of swallowing. Reduces LES pressure to 0-2 mm Hg. Triggered mainly by gastric distension.
- Impaired Esophageal Clearance: Decreased gravity clearance (supine position), poor primary/secondary peristalsis, reduced salivary neutralization during sleep.
- Gastric Factors: Delayed gastric emptying (gastroparesis) increases TLESR rate. “Gastric acid pocket” at esophagogastric junction provides acidic reservoir.
- Hiatal Hernia: Promotes retrograde flow during swallowing, trapping acid (“re-reflux” phenomenon).
- Composition of Refluxate: Acid, pepsin, bile acids, and trypsin induce mucosal injury. Non-acid/weakly acid reflux contributes significantly to extra-esophageal symptoms and infant distress.
CLINICAL MANIFESTATIONS
Symptomatology varies significantly by age.
Age-Specific Presentations
| Age Group | Typical Manifestations |
|---|---|
| Infants | Regurgitation, non-bilious vomiting, excessive crying/irritability, feeding refusal, failure to thrive (FTT), Sandifer syndrome (dystonic neck posturing/opisthotonus). |
| Young Children | Regurgitation, abdominal pain, anorexia, feeding refusal, poor weight gain. |
| Older Children & Adolescents | Heartburn (pyrosis), epigastric/retrosternal pain, regurgitation, dysphagia, odynophagia, water brash. |
Extra-Esophageal Manifestations
| System | Manifestations |
|---|---|
| Respiratory | Chronic cough, wheezing, asthma exacerbations, recurrent aspiration pneumonia, stridor, laryngomalacia. |
| Otolaryngologic | Hoarseness, vocal cord nodules, recurrent otitis media, sinusitis, globus pharyngeus. |
| Neurologic/Other | Apnea, bradycardia, Brief Resolved Unexplained Event (BRUE) / ALTE, dental erosions (lingual surface). |
DIFFERENTIAL DIAGNOSIS & ALARM SIGNS
Distinguishing GERD from organic/systemic disorders is critical.
Differential Diagnosis
| Category | Conditions |
|---|---|
| Gastrointestinal | Eosinophilic esophagitis (EoE), cow’s milk protein allergy (CMPA), achalasia, peptic ulcer disease, gastroenteritis. |
| Anatomic/Obstructive | Pyloric stenosis, malrotation with volvulus, intestinal duplication, Hirschsprung disease, antral/duodenal web. |
| Neurologic | Hydrocephalus, subdural hematoma, intracranial mass, Chiari malformation. |
| Systemic/Metabolic | Sepsis, urinary tract infection, urea cycle defects, inborn errors of metabolism. |
Red Flag (Alarm) Signs
Mandate immediate investigation to rule out alternative diagnoses:
- Bilious or persistent forceful vomiting.
- Gastrointestinal bleeding (hematemesis, hematochezia).
- Onset of regurgitation/vomiting >6 months of age OR persisting >12–18 months.
- Bulging fontanelle, macro/microcephaly, seizures.
- Unexplained lethargy, fever, weight loss.
- Hepatosplenomegaly, abdominal distension/tenderness.
DIAGNOSTIC EVALUATION
No single “gold standard” test exists. Diagnosis relies on combining clinical history with targeted investigations.
1. Esophageal pH & Impedance Monitoring
- 24-Hour pH Monitoring: Validated for quantifying acid exposure (pH < 4). Evaluates efficacy of acid-suppressive therapy.
- Multichannel Intraluminal Impedance-pH (MII-pH): Superior to pH alone. Detects acid, weakly acidic (pH 4-7), and non-acid (alkaline, pH >7) reflux episodes. Differentiates liquid vs. gas reflux. Crucial for correlating symptoms (especially respiratory/apnea) with reflux events.
2. Esophagogastroduodenoscopy (EGD) with Biopsy
- Identifies mucosal breaks, erosions, ulcers, strictures, and Barrett’s esophagus.
- Mandatory indication: Exclude EoE (requires >15 eosinophils/HPF), infectious esophagitis, or Crohn’s disease.
- Limitation: Normal mucosa (Non-Erosive Reflux Disease - NERD) is common and does not rule out GERD.
3. Radiographic Studies
- Barium Contrast (Upper GI Series): Not useful for diagnosing GERD. Indicated exclusively to rule out anatomic abnormalities (malrotation, stricture, achalasia, hiatal hernia, gastric outlet obstruction).
- Nuclear Scintigraphy (Gastric Emptying Scan): Assesses delayed gastric emptying (gastroparesis) and pulmonary aspiration (late postprandial events).
4. Therapeutic Trial (Empiric PPI)
- 4-8 week trial of Proton Pump Inhibitors (PPIs) justified in older children/adolescents with typical symptoms (heartburn, epigastric pain).
- Contraindication: Not recommended for infants presenting solely with crying/distressed behavior.
MANAGEMENT
Stepwise approach targeting lifestyle, pharmacological, and surgical interventions.
1. Lifestyle & Dietary Modifications
| Age Group | Recommendations |
|---|---|
| Infants | - Avoid overfeeding; adjust volume/frequency.- Thickened feeds (rice/oat cereal, anti-regurgitation formulas): Reduces visible regurgitation and increases caloric density.- CMPA Exclusion: 2-4 week trial of extensively hydrolyzed or amino acid-based formula; maternal dairy elimination if breastfed.- Positioning: Supine sleep recommended (prone decreases reflux but increases SIDS risk). |
| Older Children & Adolescents | - Avoid trigger foods (caffeine, chocolate, spicy/fatty foods, citrus, alcohol).- Weight loss if obese.- Left lateral decubitus sleep position with head-of-bed elevation.- Smoking cessation. |
2. Pharmacotherapy
Goal: Decrease gastric acidity or improve gastric emptying.
Acid Suppression Therapy
| Drug Class | Examples & Dosing | Mechanism & Clinical Notes |
|---|---|---|
| Proton Pump Inhibitors (PPIs) | Omeprazole (1-4 mg/kg/d), Lansoprazole (2 mg/kg/d), Esomeprazole (10-20 mg/d), Pantoprazole (1-2 mg/kg/d). | - First-line for severe/erosive GERD. Blocks Na-K-ATPase.- Administer 30 mins before breakfast.- Adverse Effects: Headache, diarrhea, hypomagnesemia, acute interstitial nephritis, increased risk of C. difficile and community-acquired pneumonia, altered microbiome. |
| H2-Receptor Antagonists (H2RAs) | Ranitidine (5-10 mg/kg/d), Famotidine (1 mg/kg/d), Nizatidine (10-20 mg/kg/d). | - Inhibits histamine receptors on parietal cells.- Better for mild esophagitis. Limited by rapid tachyphylaxis with chronic use. |
Prokinetics & Surface Agents
- Prokinetics: Metoclopramide, domperidone, erythromycin, baclofen. Limited routine use due to severe side effects (extrapyramidal symptoms, QT prolongation). Reserved for documented gastroparesis.
- Surface Agents/Antacids: Sucralfate, magnesium/aluminum hydroxide. Short-term symptomatic relief. Risk of aluminum toxicity or milk-alkali syndrome with long-term use. Not recommended as monotherapy.
3. Surgical & Endoscopic Therapy
- Indications: Intractable GERD failing maximal medical therapy, life-threatening complications (recurrent aspiration, apnea), refractory strictures, or dependence on chronic medical therapy.
- Surgical Options:
- Laparoscopic Fundoplication (Nissen 360°, or partial wraps: Toupet, Thal, Boix-Ochoa).
- Often combined with gastrostomy placement in neurologically impaired children.
- Total esophagogastric dissociation (rare, for extreme neurological impairment with life-threatening aspiration).
- Complications of Surgery: Wrap slippage, gas-bloat syndrome, retching, dysphagia, and recurrent reflux (up to 20% failure rate).
- Endoscopic Options: Radiofrequency ablation (Stretta procedure) or transoral incisionless fundoplication (limited pediatric data).
COMPLICATIONS
Prolonged, severe GERD leads to significant mucosal injury and systemic morbidity.
- Erosive Esophagitis: Mucosal breaks, exudate, bleeding. Manifests as hematemesis, anemia, or occult blood loss.
- Peptic Stricture: Fibrosis leading to esophageal narrowing. Presents with progressive dysphagia to solids. Requires serial endoscopic balloon dilatations.
- Barrett’s Esophagus: Premalignant metaplastic transformation of normal squamous epithelium into intestinal columnar epithelium. Rare in children (<0.25%) but carries 40-fold increased risk of esophageal adenocarcinoma. Requires periodic surveillance biopsies.
- Sandifer Syndrome: Spasmodic torsional dystonia, opisthotonic posturing, and arching of the back associated with reflux events. Improves with GERD treatment.
SPECIAL PEDIATRIC POPULATIONS
Neurologically Impaired Children
- Highest risk for severe, intractable GERD due to generalized foregut dysmotility, hypotonia/spasticity, scoliosis, prolonged supine positioning, and seizures.
- Present with chronic aspiration, FTT, and silent esophagitis.
- Often require surgical intervention (fundoplication) but have higher post-operative complication and failure rates.
Cystic Fibrosis (CF)
- GERD occurs secondary to hyperinflation (increased intra-abdominal pressure), physiotherapy, and delayed gastric emptying.
- Often “silent” (asymptomatic) but accelerates lung function decline via microaspiration.
- High incidence of duodenogastroesophageal (bile) reflux.
Esophageal Atresia (EA) / Tracheoesophageal Fistula (TEF)
- Post-repair intrinsic esophageal dysmotility and delayed gastric emptying lead to severe, chronic GERD.
- Exacerbates reactive airway disease and increases risk of recurrent anastomotic strictures and Barrett’s esophagus. Frequent requirement for anti-reflux surgery, though with high wrap failure rates.