Type : Phenotype or locus, molecular basis unknown;
Alternative titles and symbols : IHPS; Pyloric stenosis, infantile; Pyloric stenosis, infantile hypertrophic;
Description : Infantile pyloric stenosis is the most common condition requiring surgical intervention
in the first year of life. It typically presents in infants 2 to 6 weeks after birth.
Clinically the disorder is characterized by projectile vomiting, visible gastric peristalsis,
and a palpable pyloric tumor (summary by Everett et al., 2008). Mortality was high
until successful treatment by pyloromyotomy was developed by Ramstedt (1912). - Genetic
Heterogeneity of Infantile Hypertrophic Pyloric Stenosis Multiple susceptibility loci
have been implicated in IHPS including;
Inheritance : Autosomal dominant; Multifactorial;
Molecular basis : Susceptibility conferred by mutation in the promoter of the nitric oxide synthase-1
gene (NOS1, 163731.0001);