Pyloric Stenosis

(Infantile Hypertrophic Pyloric Stenosis)

Definition

Pyloric stenosis is narrowing of the opening from the stomach to the duodenum, the first part of the small intestine. Narrowing prevents food from passing freely between the 2 structures. Pyloric stenosis affects your baby's ability to get adequate nutrition and hydration. The sooner your baby is treated, the better the outcomes.
Pyloric Stenosis
si55551273 96472 1
Copyright © Nucleus Medical Media, Inc.

Causes

The narrowing is caused by an enlarged muscle surrounding the pylorus. The exact cause of the enlarged muscle is unknown. It is believed to be the result of several factors, which may include:
  • Genetics
  • Structural defects that occur during fetal development
  • Bacterial infection, such as Helicobacter pylori

Risk Factors

Pyloric stenosis is more common in male babies, especially if they are first born. Other factors that may increase your baby's chance of pyloric stenosis include:
  • Prematurity
  • Family history of pyloric stenosis
  • Bottle feeding
  • Ethnicity—more common in Caucasian than in Hispanic, Asian, or African-American babies

Symptoms

Pyloric stenosis is rarely present at birth. Symptoms generally appear when babies are 3-12 weeks old. The most common symptom is forceful, projectile vomiting. This is because of the build up of formula or milk in the stomach that cannot pass into the small intestine.Pyloric stenosis may also cause:
  • Your baby to act hungry most of the time
  • Weight loss
  • Signs of dehydration, such as less urination, dry mouth, and crying without tears
  • Fatigue
  • Fewer bowel movements
  • Blood-tinged vomit —occurs when repeated vomiting irritates the stomach, causing mild stomach bleeding

Diagnosis

The doctor will ask about your baby's symptoms and medical history. A physical exam will be done. In many babies, an olive-shaped knot caused by the presence of pyloric stenosis can be felt.Imaging tests assess the stomach, small intestine, and other structures. These may include:

Treatment

If your baby is diagnosed with pyloric stenosis, they will be referred to a pediatric surgeon for treatment. Pyloric stenosis is treated with pyloroplasty (also called a pyloromyotomy), a procedure to relieve blockage.Prior to surgery, fluids and electrolytes will be given by IV to correct any dehydration or electrolyte imbalances that are common in babies with pyloric stenosis. After the procedure, IV fluids are given until your baby can take all of their normal feedings by mouth.

Advertisement

Prevention

There are no current guidelines to prevent pyloric stenosis because the cause is unknown. Talk to your doctor about proper prenatal care before or during pregnancy.

RESOURCES

American Academy of Pediatrics
http://www.healthychildren.org

The American Pediatric Surgical Association
http://www.eapsa.org

CANADIAN RESOURCES

Caring for Kids—Canadian Paediatric Society
http://www.caringforkids.cps.ca

Health Canada
http://www.hc-sc.gc.ca

References

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.

Peters B, Oomen MW, et al. Advances in infantile hypertrophic pyloric stenosis. Expert Rev Gastroenterol Hepatol. 2014;8(5):533-541.

Pisacane A, de Luca U, Criscuolo L, et al. Breastfeeding and hypertrophic pyloric stenosis: population-based case-control study. BMJ. 1996;312:745-746.

Pyloric stenosis. EBSCO DynaMed website. Available at: http://www.ebscohost.com/dynamed. Updated April 14, 2014. Accessed September 30, 2014.

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.

11/4/2013 DynaMed's Systematic Literature Surveillance. Available at: http://dynamed.ebscohost.com: McAteer JP, Ledbetter DJ, et al. Role of bottle feeding in the etiology of hypertrophic pyloric stenosis. JAMA Pediatr. 2013;167(12):1143-1149.

Revision Information

leave comments
0
Did you like this? Share with your family and friends.
Related Topics:
Current Research From Top Journals


Early Peanut Consumption Associated with Lower Risk of Peanut Allergy in High Risk Children
March 2015

Many medical groups felt that early exposure to certain foods like peanuts increased a child's risk of developing food allergies. However, newer research including this trial suggest that early exposure may actually decrease the risk of developing food allergies.

dot separator
previous editions

Breastfeeding May Decrease the Risk of Childhood Obesity
February 2015

Tonsillectomy May Reduce Number of Sore Throat Days in Children
February 2015

Research Review Finds Little Support for Nearly Half of Medical Talk Show Recommendations
January 2015

dashed separator

Advertisement

Our Free Newsletter
click here to see all of our uplifting newsletters »

 

Advertisement

Advertisement

DiggDeliciousNewsvineRedditStumbleTechnoratiFacebook