(Infantile Hypertrophic Pyloric Stenosis)
Pronounced: Py-loric sten-OH-sis
Food passes from the stomach to the small intestine. In pyloric stenosis, food cannot pass freely because the entrance between the stomach and the small intestine narrows. The narrowing is caused by the enlargement of the pylorus (the muscle at the entrance to the stomach). Almost all cases of pyloric stenosis happen in very young babies (usually 3-12 weeks old). This problem happens about 2-4 times out of every 1,000 births. It is much more common in males than in females. The sooner pyloric stenosis is treated, the fewer problems will result and the healthier your baby will be, so if you think your child has this condition, contact your doctor immediately.
Pyloric stenosis is rarely present at birth, but develops soon afterward. Its exact cause is unknown, but it is believed to be partly inherited, as cases of pyloric stenosis tend to run in families.
The following factors increase your baby’s chance of developing pyloric stenosis. If your child has any of these risk factors, tell your doctor.
- Family history of pyloric stenosis
- More common in male babies (particularly first-born males)
- More common in Caucasian than in Latino, Asian, or African-American babies
Symptoms of pyloric stenosis usually begin when babies are 3-5 weeks old. They include:
- Forceful vomiting of formula or milk
- Acting hungry most of the time
- Weight loss
- Signs of dehydration
Your doctor will ask about symptoms your child is experiencing and about his or her medical history. He or she will also perform a physical examination. An olive-shaped knot caused by the presence of pyloric stenosis is often felt by the experienced examiner. If your baby is diagnosed with pyloric stenosis, you and your family will be referred to a pediatric surgeon (a doctor specializing in surgery in children).
Tests may include the following:
Pyloric stenosis is treated with a surgery called a pyloromyotomy
American Association of Pediatrics
The American Pediatric Surgical Association
Caring for Kids, The Canadian Paediatric Society
The Montreal Children's Hospital
Hernanz-Schulman M. Infantile hypertrophic pyloric stenosis. Isr Med Assoc J . 2004;6:160-161.
Kim SS, Lau ST, Lee SL, et al. Pyloromyotomy: a comparison of laparoscopic, circumumbilical, and right upper quadrant operative techniques. J Am Coll Surg . 2005;201:66-70.
Pisacane A, de Luca U, Criscuolo L, et al. Breastfeeding and hypertrophic pyloric stenosis: population-based case-control study. BMJ . 1996;312:745-746.
White JS, Clements WD, Heggarty P, et al. Treatment of infantile hypertrophic pyloric stenosis in a district general hospital: a review of 160 cases. J Pediatr Surg . 2003;38:1333-1336.
Last reviewed November 2008 by
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.
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