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What Is Infantile Hypertrophic Pyloric Stenosis?

Infantile Hypertrophic Pyloric Stenosis (IHPS) is a relatively uncommon condition found in infants, usually between two and eight weeks old. It occurs when the pylorus, the muscular valve that connects the stomach to the small intestine, thickens dramatically (hypertrophic), creating a blockage (stenosis). This thickened muscle prevents milk or formula from passing out of the stomach, effectively trapping food and causing severe symptoms.

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What Is Infantile Hypertrophic Pyloric Stenosis?

Infantile Hypertrophic Pyloric Stenosis (IHPS) is a relatively uncommon condition found in infants, usually between two and eight weeks old. It occurs when the pylorus, the muscular valve that connects the stomach to the small intestine, thickens dramatically (hypertrophic), creating a blockage (stenosis). This thickened muscle prevents milk or formula from passing out of the stomach, effectively trapping food and causing severe symptoms.

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Defining Projectile Vomiting

The clearest symptom of IHPS is projectile vomiting. Because the stomach's exit is blocked, the stomach muscles forcefully contract to try and push food past the obstruction. This makes the vomit shoot out with great force, often several feet away, shortly after feeding. The baby usually acts hungry again right after vomiting because the food never reached the small intestine to be digested.

Diagnosis and Surgical Fix

Diagnosis is usually confirmed with an ultrasound, which clearly shows the thickened pylorus muscle. Because the blockage prevents nutrients from reaching the body, IHPS is always treated with a simple surgical procedure called a pyloromyotomy. The surgeon cuts through the thickened muscle, allowing food to pass from the stomach into the small intestine again. It's a highly successful procedure that offers a quick and permanent fix for the baby.

Long-Term Outlook

After a pyloromyotomy, the baby's feeding issues stop almost immediately. The long-term outlook for a baby who has undergone this surgery is outstanding. There are generally no lasting digestive problems, and the chance of the condition recurring is extremely low. The baby can continue normal feeding and development immediately after recovery.

Call 911 Immediately

If an infant under six months exhibits forceful, projectile vomiting (especially after every feeding), constant hunger, and signs of dehydration (less urination, lethargy), seek emergency medical care immediately. This condition requires prompt surgical correction (pyloromyotomy) to prevent severe dehydration.

Frequently Asked Questions About Infantile Hypertrophic Pyloric Stenosis

Who is most likely to get Infantile Hypertrophic Pyloric Stenosis?

It is five times more common in firstborn males. It is also more common in babies treated with certain antibiotics early in life.

Is it safe to wait for the condition to go away on its own?

No. IHPS is a blockage that does not resolve on its own. Untreated, it can lead to severe dehydration and malnutrition, which can be life-threatening. Medical intervention is necessary.

How soon after surgery can the baby eat normally?

Babies are typically allowed to start feeding again within 12 to 24 hours after a pyloromyotomy. Most infants resume a normal feeding schedule within a few days.