Definition And Epidemiology
- Gastroesophageal Reflux (GER): Involuntary, physiologic retrograde passage of gastric contents into the esophagus, with or without regurgitation.
- Gastroesophageal Reflux Disease (GERD): GER that leads to troublesome symptoms or complications, such as esophagitis, nutritional compromise, or respiratory disease.
- Epidemiology: Physiologic GER peaks at 4 months of age and resolves in 88% to 95% of infants by 12 to 24 months.
- High-Risk Populations: Children with neurologic impairment (e.g., cerebral palsy), obesity, repaired esophageal atresia, hiatal hernia, cystic fibrosis, and prematurity.
Pathophysiology
- Transient Lower Esophageal Sphincter Relaxation (TLESR): Represents the primary mechanism, characterized by simultaneous relaxation of the lower esophageal sphincter and crura independent of swallowing, typically triggered by gastric distension.
- Anti-Reflux Barrier Failure: Dysfunction of the lower esophageal sphincter, diaphragmatic pinchcock, and the angle of His.
- Impaired Clearance And Motility: Decreased gravity clearance in the supine position, poor primary or secondary peristalsis, and reduced salivary neutralization.
- Gastric Factors: Delayed gastric emptying increases the rate of TLESR, and a "gastric acid pocket" at the esophagogastric junction acts as an acidic reservoir.
- Hiatal Hernia: Promotes retrograde flow during swallowing, trapping acid in a "re-reflux" phenomenon.
Clinical Manifestations
Age-Specific Presentations
| Age Group | Typical Manifestations |
|---|---|
| Infants | Regurgitation, non-bilious vomiting, excessive crying, feeding refusal, failure to thrive, Sandifer syndrome (dystonic neck posturing/opisthotonus). |
| Young Children | Regurgitation, abdominal pain, anorexia, feeding refusal, poor weight gain. |
| Older Children & Adolescents | Heartburn (pyrosis), epigastric or retrosternal pain, regurgitation, dysphagia, 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, dental erosions on the lingual surface. |
Alarm Signs (Red Flags)
Presence of these signs mandates immediate investigation to exclude organic or systemic disorders.
- Bilious or persistent forceful vomiting.
- Gastrointestinal bleeding (hematemesis, hematochezia).
- Onset of regurgitation or vomiting beyond 6 months of age, or persisting beyond 12 to 18 months.
- Bulging fontanelle, macrocephaly, microcephaly, or seizures.
- Unexplained lethargy, fever, or weight loss.
- Hepatosplenomegaly or abdominal distension.
Diagnostic Evaluation
| Modality | Diagnostic Utility And Interpretation |
|---|---|
| Multichannel Intraluminal Impedance-pH (MII-pH) | Superior to pH monitoring alone; detects acid, weakly acidic, and non-acid reflux episodes. Crucial for correlating symptoms (especially respiratory/apnea) with reflux events. |
| 24-Hour pH Monitoring | Validated for quantifying acid exposure (pH < 4) and evaluating the efficacy of acid-suppressive therapy. |
| Esophagogastroduodenoscopy (EGD) With Biopsy | Identifies mucosal breaks, erosions, strictures, and Barrett's esophagus. Mandatory to exclude eosinophilic esophagitis (>15 eosinophils/HPF) or infectious esophagitis. |
| Barium Contrast (Upper GI Series) | Not useful for diagnosing GERD; indicated exclusively to rule out anatomic abnormalities like malrotation, strictures, or hiatal hernia. |
| Empiric PPI Trial | 4-8 week trial justified in older children with typical symptoms (heartburn), but contraindicated for infants presenting solely with crying or distress. |
Management Protocol
Lifestyle And Dietary Modifications
| Age Group | Recommended Interventions |
|---|---|
| Infants | Avoid overfeeding; utilize thickened feeds to reduce visible regurgitation and increase caloric density. Implement a 2-4 week trial of extensively hydrolyzed formula or maternal dairy elimination to exclude cow's milk protein allergy. Maintain supine sleep position. |
| Older Children | Avoid trigger foods (caffeine, chocolate, spicy/fatty foods), promote weight loss if obese, and utilize left lateral decubitus sleep position with head-of-bed elevation. |
Pharmacotherapy
- Proton Pump Inhibitors (PPIs): First-line therapy for severe or erosive GERD (e.g., Omeprazole, Lansoprazole). Administer 30 minutes before breakfast. Adverse effects include headache, diarrhea, hypomagnesemia, and altered microbiome.
- H2-Receptor Antagonists: Alternative for mild esophagitis (e.g., Ranitidine, Famotidine). Efficacy is limited by rapid tachyphylaxis with chronic use.
- Prokinetics: Agents like metoclopramide or domperidone have limited routine use due to severe side effects like extrapyramidal symptoms and QT prolongation, reserving them strictly for documented gastroparesis.
Surgical Intervention
- Indications: Intractable GERD failing maximal medical therapy, life-threatening complications (recurrent aspiration, apnea), refractory strictures, or dependence on chronic medical therapy.
- Procedure: Laparoscopic Fundoplication (Nissen 360°, or partial wraps like Toupet/Thal).
- Complications: Wrap slippage, gas-bloat syndrome, retching, dysphagia, and recurrent reflux.
Complications
- Erosive Esophagitis: Mucosal breaks and bleeding manifesting as hematemesis or anemia.
- Peptic Stricture: Fibrosis causing esophageal narrowing and progressive solid dysphagia, requiring serial endoscopic balloon dilatations.
- Barrett's Esophagus: Premalignant metaplastic transformation into intestinal columnar epithelium, carrying a 40-fold increased risk of esophageal adenocarcinoma.
- Sandifer Syndrome: Spasmodic torsional dystonia, opisthotonic posturing, and arching of the back associated with reflux events.