Pyloric Piper
Projectile vomiting in a 3-to-6-week-old who is starving right after — feel for the olive
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Pyloric Piper
Pyloric Stenosis: The Olive, the Fountain and the Hungry Baby
Projectile vomiting in a 3-to-6-week-old who is starving right after — feel for the olive
The fountain goes off after every feed, the olive sits under Piper's fingertips, and the baby cries for more.
mnemonurse.com
The story
The fountain goes off after every feed, the olive sits under Piper's fingertips, and the baby cries for more.
Piper guards the stomach's exit. In pyloric stenosis the muscle at the stomach outlet thickens until formula cannot pass, and it shoots back out as projectile vomiting — forceful, non-bloody and non-bilious, typically appearing at 3 to 6 weeks of age. The classic exam finding is a small, firm, olive-shaped mass in the right upper abdomen, with visible stomach waves moving left to right. The cruel clue: the baby vomits, then is immediately hungry again. Every vomit loses stomach acid, so the baby develops low chloride, low potassium and metabolic alkalosis — the opposite pattern of most vomiting illnesses. Treatment is pyloromyotomy after fluids and electrolytes are corrected.
The full story of Pyloric Piper
Piper's parents nicknamed their infant son Pyloric Piper after weeks of watching him nurse hungrily every single time, only to erupt in a forceful, arcing stream of vomit minutes later that seemed to fly clear across the room like water from a piper's flute. What looked at first like ordinary reflux was in fact a thickening, narrowing ring of muscle at the outlet of his stomach, the pylorus, gradually closing off the passage that should carry milk into the duodenum. Because nothing could pass through, feedings backed up and were expelled with startling force, while Piper remained ravenously hungry immediately afterward since none of the milk had actually reached his intestine to satisfy him. Losing stomach contents rich in hydrogen and chloride ions with every episode was quietly setting Piper up for a dangerous electrolyte disturbance long before anyone recognized the underlying obstruction.
At five weeks old, Piper is brought to the pediatric clinic by his increasingly anxious mother, who reports that his vomiting has become projectile rather than the gentle spit-up of his earlier weeks, occurring immediately after nearly every feeding and shooting several feet from his mouth. She notes he seems perpetually hungry, rooting eagerly for the bottle again within minutes of vomiting, and that he has not gained weight over the past ten days despite feeding voraciously. On examination, the pediatrician palpates a small, firm, olive-shaped mass in Piper's right upper quadrant, a classic finding of hypertrophied pyloric muscle. His fontanel appears slightly sunken, and his mother reports fewer than five wet diapers over the last twenty-four hours, prompting immediate admission for further evaluation of dehydration and obstruction.
By the time Piper is admitted, his condition has clearly worsened. His serum electrolytes reveal a chloride level of 88 mEq/L and a potassium of 3.1 mEq/L, alongside a blood gas showing metabolic alkalosis with a bicarbonate of 32 mEq/L, the textbook hypochloremic, hypokalemic pattern produced by relentless loss of stomach acid through vomiting. His weight has dropped from 4.6 kilograms at birth-adjusted baseline to just 4.1 kilograms, and his mucous membranes appear visibly dry and tacky. He remains alert but increasingly listless between feeding attempts, and abdominal ultrasound soon confirms pyloric muscle thickening measuring well beyond normal limits, establishing the diagnosis of hypertrophic pyloric stenosis requiring surgical correction once he is medically stabilized.
The nurse's priority is unmistakable: correct the fluid and electrolyte imbalance before any thought of surgery, since operating on an alkalotic, dehydrated infant with dangerously low chloride and potassium risks anesthesia complications and cardiac arrhythmia. She keeps Piper nothing by mouth, maintains gentle gastric decompression as ordered, and administers the prescribed intravenous fluids containing dextrose, sodium chloride, and potassium to methodically restore normal serum values before the surgeon proceeds. She monitors his intake and output meticulously, weighs him daily, and rechecks his electrolyte panel to confirm the alkalosis is resolving. Only once his labs normalize does she prepare him for pyloromyotomy, understanding that no antiemetic could ever fix a mechanical obstruction like Piper's.
Remember Pyloric Piper whenever the NCLEX describes a three-to-six-week-old infant with forceful, non-bilious projectile vomiting who remains hungry immediately afterward: his name is your cue to feel for that classic olive-shaped mass in the right upper quadrant. Lock in the signature lab pattern of hypochloremic, hypokalemic metabolic alkalosis, the opposite acid-base disturbance from what many other pediatric emergencies produce. Above all, remember that correcting fluid and electrolyte imbalance always comes before surgical repair, never the reverse, because a dehydrated, alkalotic infant cannot safely tolerate anesthesia. And remember that reflux, unlike Piper's obstruction, produces effortless spitting with normal growth, never this dramatic weight loss and dehydration.
Story arc
The setup
A 4-week-old has begun vomiting forcefully after every feeding.
The turn
On exam, Piper feels a small olive-shaped mass in the right upper abdomen and sees waves ripple across the belly.
The crisis
Despite the vomiting, the baby screams to feed again — and the labs show an unusual alkalosis.
The save
After IV fluids and electrolyte correction, a quick pyloromyotomy opens the exit and the baby feeds peacefully.
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