Infantile Hypertrophic Pyloric Stenosis

In an infant with forceful emesis, establish whether vomitus is nonbilious or bile stained before pursuing pyloric stenosis. Green or yellow-green vomiting suggests intestinal obstruction and requires pediatric surgical referral rather than a pyloric-stenosis pathway. nice org uknice org ukAppendix A: Summary of evidence from surveillance Abdominal distension, tenderness, hematemesis not attributable to swallowed blood, melena, dysphagia, and faltering growth are red flags for diagnoses other than uncomplicated reflux and should accelerate hospital assessment. nice org uknice org ukAppendix A: Summary of evidence from surveillance

Suspect infantile hypertrophic pyloric stenosis (IHPS) when an infant, usually 3 to 8 weeks old, develops progressive projectile milky, nonbilious emesis and remains hungry after vomiting. ScienceDirectScienceDirectInfantile hypertrophic pyloric stenosis - ScienceDirect For infants younger than 2 months with progressively worsening or forceful post-feed vomiting, arrange same-day assessment for possible IHPS. nice org uknice org ukAppendix A: Summary of evidence from surveillance IHPS is a fixed hypertrophic narrowing of the pylorus that obstructs gastric emptying; pylorospasm is intermittent spasm without permanent luminal narrowing and should not be equated with IHPS. CDCCDCGuidelines for Conducting Birth Defects Surveillance

Assess perfusion, hydration, weight trajectory, feeding tolerance, abdominal distension or tenderness, and electrolyte-related clinical risk at presentation. Obtain serum electrolytes and acid-base assessment when dehydration or repeated vomiting is present because the classic biochemical pattern is hypochloremic, hypokalemic metabolic alkalosis, although many contemporary presentations have normal electrolyte results. ScienceDirectScienceDirectOptimizing throughput of babies with infantile hypertrophic pyloric stenosis - ScienceDirect A severe chloride deficit, including serum chloride below 100 mmol/L, has been identified as a marker of substantial preoperative metabolic derangement. ScienceDirectScienceDirectInfantile hypertrophic pyloric stenosis - ScienceDirect

IHPS can often be diagnosed from the clinical presentation and physical examination, but abdominal ultrasound or contrast gastric radiography may be required for conclusive diagnosis. CDCCDCGuidelines for Conducting Birth Defects Surveillance Use ultrasound when a feeding assessment and abdominal examination have not confirmed IHPS but the clinical pattern remains compelling. ScienceDirectScienceDirectInfantile hypertrophic pyloric stenosis A high-resolution study performed by an experienced pediatric sonographer or pediatric radiologist improves diagnostic specificity and sensitivity. ScienceDirectScienceDirectInfantile hypertrophic pyloric stenosis

Interpret a negative or equivocal ultrasound in the clinical context. In premature infants, a reported pyloric muscle thickness of 2.0 mm was negative in a case with persistent feeding intolerance, illustrating that ongoing symptoms may require reassessment rather than diagnostic closure. JAMAJAMAPyloric Stenosis in Premature Infants When a definitive ultrasound is not available or remains nondiagnostic, contrast radiography of the stomach is an established alternative diagnostic method. CDCCDCGuidelines for Conducting Birth Defects Surveillance

Point-of-care ultrasound has an expanding role in pediatric emergency practice for identifying IHPS, with the primary clinical application being an infant with nonbloody, nonbilious projectile vomiting. annemergmed+1annemergmedUltrasound Guidelines: Emergency, Point-of-Care, and ...annemergmedPolicy Statements A positive bedside study should expedite surgical and anesthesia coordination; an indeterminate bedside study should not replace formal imaging when uncertainty remains.

Once IHPS is diagnosed or strongly suspected, withhold further feeds, decompress with a nasogastric tube when used locally, and begin intravenous fluid and electrolyte replacement. ScienceDirectScienceDirectInfantile hypertrophic pyloric stenosis The operative priority is not immediate pyloromyotomy: anesthesia before correction of metabolic alkalosis poses substantial risk and has been described as potentially fatal. ScienceDirectScienceDirectInfantile hypertrophic pyloric stenosis This optimization may require several days in infants with significant deficits. ScienceDirectScienceDirectInfantile hypertrophic pyloric stenosis

Reassess electrolyte and acid-base abnormalities during resuscitation and defer general anesthesia until dehydration and metabolic derangement are corrected. ScienceDirect+1ScienceDirectOptimizing throughput of babies with infantile hypertrophic pyloric stenosis - ScienceDirectScienceDirectInfantile hypertrophic pyloric stenosis The traditional pattern is hypochloremic, hypokalemic metabolic alkalosis; however, normal electrolyte results do not exclude IHPS or eliminate the need to assess hydration and anesthetic readiness. ScienceDirectScienceDirectOptimizing throughput of babies with infantile hypertrophic pyloric stenosis - ScienceDirect Infants with more severe derangement, including serum chloride below 100 mmol/L, merit particular attention to correction before surgery. ScienceDirectScienceDirectInfantile hypertrophic pyloric stenosis - ScienceDirect

Use a standardized institutional fluid-resuscitation pathway when available. In a single-center retrospective cohort of 319 infants with IHPS and electrolyte derangement, implementation of a severity-based protocol reduced preoperative laboratory draws, time to electrolyte correction, and total length of stay. ScienceDirectScienceDirectEvaluation of a fluid resuscitation protocol for patients with hypertrophic pyloric stenosis - ScienceDirect Protocols should specify repeat laboratory timing and planned fluid interventions by initial abnormality severity rather than rely on unstructured serial testing. ScienceDirectScienceDirectEvaluation of a fluid resuscitation protocol for patients with hypertrophic pyloric stenosis - ScienceDirect

After adequate resuscitation, refer for pyloromyotomy, the definitive treatment for IHPS. The operation divides the hypertrophied pyloric muscle longitudinally while leaving the mucosa intact. ScienceDirectScienceDirectInfantile hypertrophic pyloric stenosis - ScienceDirect Operative access may be open or laparoscopic; both are established approaches, and a Cochrane review evaluates laparoscopic versus open pyloromyotomy in infants with IHPS. CochraneCochraneFull All content Selection should reflect local pediatric surgical expertise and the infant's clinical condition rather than an attempt to shorten the preoperative correction interval.

Expect surgery after, not before, correction of physiologic abnormalities. Although a retrospective two-hospital study found that many infants could safely undergo surgery on the admission day, only 43% did so, and an afternoon diagnosis was associated with a 4.2-fold greater likelihood of surgery being delayed to hospital day 2 or later. ScienceDirectScienceDirectOptimizing throughput of babies with infantile hypertrophic pyloric stenosis - ScienceDirect Scheduling should therefore be driven by readiness for anesthesia, not an arbitrary same-day target. ScienceDirect+1ScienceDirectOptimizing throughput of babies with infantile hypertrophic pyloric stenosis - ScienceDirectScienceDirectInfantile hypertrophic pyloric stenosis

Counsel families that early postoperative feeding can be performed safely. ScienceDirectScienceDirectInfantile hypertrophic pyloric stenosis - ScienceDirect Postoperative emesis may occur, but contemporary outcomes following preoperative optimization and pyloromyotomy are excellent; long-term sequelae are uncommon and mortality is almost unknown in developed settings. ScienceDirect+1ScienceDirectInfantile hypertrophic pyloric stenosis - ScienceDirectScienceDirectInfantile hypertrophic pyloric stenosis Persistent or recurrent vomiting after surgery should prompt reassessment for an incomplete myotomy, mucosal injury-related complications, or an alternative diagnosis rather than automatic attribution to expected postoperative symptoms. Inadequate pyloromyotomy has been reported particularly at the duodenal end. Wolters KluwerWolters KluwerTrends and Surgical Outcomes of Laparoscopic vs...

Ask specifically about infant macrolide exposure when evaluating vomiting in early infancy. Oral erythromycin has been associated with IHPS in infants younger than 6 weeks, and CDC guidance advises follow-up for IHPS symptoms in exposed infants. CDCCDCSexually Transmitted Diseases Treatment Guidelines, 2006 Associations have also been reported with azithromycin and other macrolides. CDC+1CDCSexually Transmitted Diseases Treatment Guidelines, 2015CDCPrevention of Pertussis, Tetanus, and Diphtheria Among ... New forceful nonbilious vomiting after such exposure should trigger the same urgent clinical assessment and imaging pathway used for any suspected IHPS.

Avoid labeling all vomiting after macrolide therapy as medication intolerance. The diagnosis still requires assessment for fixed pyloric obstruction and exclusion of bilious obstruction or other red-flag conditions. CDC+1CDCGuidelines for Conducting Birth Defects Surveillancenice org ukAppendix A: Summary of evidence from surveillance Conversely, a plausible medication association should not delay evaluation when the vomiting phenotype is progressive or projectile.