GERD

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.