Q40.0 Congenital hypertrophic pyloric stenosis

Name of the Condition

• Congenital Hypertrophic Pyloric Stenosis

Summary

This condition is a narrowing of the pylorus, the opening between the stomach and small intestine, due to thickening of the pyloric muscle. It occurs in infants and can obstruct the passage of food, leading to feeding difficulties and vomiting.

Causes

The exact cause is not fully understood, but it is thought to involve a combination of genetic and environmental factors. Abnormal development of the pyloric muscle during fetal growth may contribute to the thickening observed after birth.

Risk Factors

• Male infants are more commonly affected.
• Firstborn infants have a higher risk.
• Family history of the condition.
• Certain genetic syndromes may increase susceptibility.

Symptoms

• Projectile vomiting, often after feeding.
• Dehydration or weight loss.
• Visible wave-like contractions in the abdomen.
• Reduced urine output or lethargy in severe cases.

Diagnosis

Diagnosis is typically based on clinical evaluation and physical examination, including palpation of an olive-shaped mass in the abdomen. Imaging studies like ultrasound may confirm pyloric muscle thickness.

Treatment Options

• Initial management focuses on fluid and electrolyte replacement.
• Surgical intervention (pyloromyotomy) is the definitive treatment to relieve the obstruction.
• Postoperative care includes gradual reintroduction of feeding.

Prognosis and Follow-Up

With timely treatment, most infants recover fully and have no long-term complications. Follow-up may involve monitoring for feeding tolerance and growth.

Complications

• Dehydration or electrolyte imbalances from persistent vomiting.
• Failure to thrive if untreated.
• Rarely, wound infections or other surgical complications.

Lifestyle & Prevention

There are no known preventive measures, as the condition is congenital. Early recognition and treatment are key to avoiding complications.

When to Seek Professional Help

Seek medical attention if an infant exhibits persistent vomiting, signs of dehydration, or fails to gain weight. Prompt evaluation is important to prevent severe outcomes.

Tips for Medical Coders

Document the clinical findings supporting the diagnosis, such as physical examination results or imaging. Ensure the code Q40.0 is used for congenital hypertrophic pyloric stenosis without additional modifiers unless specified by guidelines.