Pediatric Pyloric Stenosis

by Carlo Raj, MD

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    00:01 The topic is pyloric stenosis.

    00:04 Before we move on, please understand where the pylorus is. Picture it.

    00:09 You’re in the antrum of the stomach and you’re about to enter the first part of the duodenum.

    00:13 What then happens here is the fact that the pylorus, which is a smooth muscle, technically it’s not even a sphincter, it’s a physiologic smooth muscle hypertrophy that may take place excessively resulting in gastric outlet obstruction.

    00:32 So if there’s outlet obstruction, you can’t get into the duodenum what's the only direction that this chime can move in? Projectile vomiting.

    00:42 And the vomit that you’re going to experience or see here is going to be non-bilious because you haven’t connected the common bile duct yet.

    00:52 Risk factors: Males, and we’re not exactly sure why.

    00:56 Usually first born, it’s interesting.

    00:59 And the ratio of males to females is 4:1.

    01:02 So boys, much, much, much more so.

    01:04 Look for family history of pyloric stenosis.

    01:08 Signs and symptoms: Non-bilious projectile vomiting, often after three weeks of age in that boy.

    01:16 The “happy vomiter” is what they’re called and may have palpable olive in the right upper quadrant.

    01:24 That’s where you’d expect your pyloric -- or hypertrophic pylorus to be.

    01:30 Diagnosis: Well, here, supportive therapy is important.

    01:36 Hypokalemia, hyperchloremic, metabolic alkalosis might be a possibility because of the vomiting.

    01:43 Our management will be supportive.

    01:46 Remember, with pyloric stenosis, you have a young boy who’s vomiting quite a bit.

    01:49 So with that vomit, remember, this will be a metabolic alkalosis.

    01:53 And with that vomiting taking place, you might be worried about potassium and, well, electrolyte disturbances.

    02:02 With excessive vomiting that might be taking place, you’re always worried about hydration status of your child rehydration, outright correction, and then ultimately, surgical correction may be necessary.

    About the Lecture

    The lecture Pediatric Pyloric Stenosis by Carlo Raj, MD is from the course Pediatric GI Pathology.

    Included Quiz Questions

    1. Hypertrophy
    2. Atrophy
    3. Hyperplasia
    4. Metaplasia
    5. Dysplasia
    1. Palpable, "olive-like" mass in the right upper quadrant
    2. Palpable, "sausage-like" mass in the umbilical region
    3. Doughy abdomen
    4. Board-like, rigid abdomen
    5. Cystic mass in the abdomen
    1. Serum Cl – decreased, serum K – decreased
    2. Serum Cl – increased, serum K – increased
    3. Serum Cl – increased, serum K – decreased
    4. Serum Cl – decreased, serum K – increased
    5. Serum Cl – no change, serum K – decreased
    1. Metabolic alkalosis
    2. Metabolic acidosis
    3. Respiratory acidosis
    4. Respiratory alkalosis
    5. No change in the metabolic status
    1. Barium enema
    2. Surgery
    3. Rehydration
    4. Electrolyte disturbance correction
    5. Ultrasound scan of the pyloric region

    Author of lecture Pediatric Pyloric Stenosis

     Carlo Raj, MD

    Carlo Raj, MD

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