Magnet ingestion

(Redirected from Magnet Ingestion)

Background

  • Magnet ingestion is a special category of ingested foreign body associated with high morbidity and mortality, particularly when multiple high-powered magnets or a magnet with another metallic object are swallowed.[1]


  • Most commonly occurs in children <5 years of age, with a second peak in adolescents (ages 10-14) who use magnets to mimic oral/nasal piercings[2]
  • Adult cases are rare and typically associated with psychiatric disorders, intellectual disability, or self-harm[3]
  • Rare-earth (neodymium) magnets are up to 10 times stronger than conventional ferrite magnets and pose the greatest risk
  • Incidence has risen significantly since 2002, correlating with availability of high-powered magnet desk toys and building sets[4]
  • Single magnet ingestion generally behaves like any other small blunt foreign body and usually passes without complication
  • Multiple magnets (or a magnet + metallic object) can attract across bowel walls, trapping intervening tissue and causing pressure necrosis within hours[5]
    • Pressure ulceration can occur within 8 hours of ingestion[6]
    • Staggered ingestion (magnets swallowed at different times) is especially dangerous as magnets may lodge in different segments of bowel

Clinical Features

  • Many patients are asymptomatic in the early phase, leading to delayed presentation[1]
  • Ingestion is frequently unwitnessed, especially in young children
  • Symptoms are often nonspecific and may mimic acute gastroenteritis
  • Early symptoms:
    • Gagging, choking, or drooling at time of ingestion (if witnessed)
    • Nausea, vomiting (most common presenting symptom)
    • Abdominal pain
    • Decreased oral intake
  • Late/complicated symptoms:
    • Bilious vomiting
    • Abdominal distension and tenderness
    • Fever
    • Signs of peritonitis (guarding, rigidity, rebound tenderness)
    • Hematemesis or melena (uncommon)
  • Symptoms progress with increasing duration of ingestion and proximity of magnets across bowel walls

Differential Diagnosis

Ingested foreign body (non-magnetic)

Abdominal pathology

Evaluation

Workup

  • Abdominal radiograph (AP view) — first-line imaging for all suspected ingestions
    • If magnets visualized on AP film, obtain a lateral view to help differentiate single vs. multiple magnets[7]
      • Multiple magnets stacked together may appear as a single object on AP view
      • Lateral view may reveal separation or layering that suggests multiple pieces
    • Serial radiographs every 4-6 hours (in ED) or 8-12 hours (inpatient) to assess progression
  • Labs: CBC, BMP, lipase if symptomatic; type and screen if concern for surgical intervention
  • CT abdomen/pelvis — consider if concern for perforation, obstruction, or unclear radiograph findings
    • Useful for identifying free air, free fluid, abscess
    • CT also lacks sensitivity for determining exact number of magnets[1]
  • Ultrasound — emerging adjunct to assess for bowel loop entrapment between magnets[8]
  • MRI is absolutely contraindicated — ferromagnetic foreign bodies may migrate, heat, or cause perforation in the magnetic field[9]

Diagnosis

  • Diagnosis is confirmed by visualization of metallic foreign body on radiograph in the setting of known or suspected magnet exposure
  • Critical determination is single vs. multiple magnets, which dictates the management pathway
    • History alone may be unreliable — assume multiple magnets if unable to confirm definitively[10]
  • If single vs. multiple cannot be reliably distinguished, manage as multiple

Management

Single magnet (confirmed)

  • May be managed conservatively like other small blunt foreign bodies
  • Outpatient observation with serial radiographs to confirm passage
  • Ensure no co-ingestion of other metallic objects
  • Caregiver education and return precautions

Multiple magnets (confirmed or suspected)

  • Consult pediatric surgery and/or GI early
  • Management depends on symptoms, location, and time since ingestion:

Symptomatic patient

  • Immediate removal is indicated[1]
    • Endoscopic removal if magnets are in the esophagus, stomach, duodenum, or colon
    • Surgical consultation if endoscopic removal fails or complications suspected
    • Surgical exploration (laparotomy or laparoscopy) if signs of peritonitis, perforation, or obstruction

Asymptomatic patient

  • If magnets are in the esophagus or stomach → endoscopic removal[7]
  • If magnets are beyond the pylorus:
    • Serial abdominal radiographs every 4-6 hours to assess progression[1]
    • If magnets progress distally on serial imaging → may continue observation with close follow-up and serial imaging until passage confirmed
    • If magnets do not progress within 6 hours → removal indicated (endoscopic or surgical)[1]
    • Consider polyethylene glycol (PEG) whole bowel irrigation to facilitate passage[10]
  • Keep patient NPO until definitive management plan established
  • Do not use a magnet placed externally on the abdomen to attempt to move ingested magnets

Complications of delayed treatment

Disposition

  • Single confirmed magnet, asymptomatic: may discharge with caregiver education, return precautions, and outpatient follow-up with serial imaging until passage confirmed
  • Multiple magnets in esophagus or stomach: admit for endoscopic removal
  • Multiple magnets beyond the pylorus, progressing on serial films, asymptomatic: may discharge with very close outpatient follow-up and serial imaging if reliable caregiver
  • Multiple magnets beyond the pylorus, not progressing: admit for removal
  • Any symptomatic patient with multiple magnets: admit; surgical consultation
  • After any endoscopic or surgical removal, confirm all magnet pieces accounted for (correlate with radiographic count); intraoperative radiograph if discrepancy
  • Patients should be observed for a minimum of 4-6 hours after endoscopic removal or presentation before discharge[7]
  • Caregiver education on prevention: remove small high-powered magnets from the home environment

See Also

External Links

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Altokhais T.
    • Magnet Ingestion in Children Management Guidelines and Prevention. Front Pediatr. 2021;9:727988. doi:10.3389/fped.2021.727988
  2. ↑ Silverman JA, Brown JC, Willis MM, Ebel BE. Increase in pediatric magnet-related foreign bodies requiring emergency care. Ann Emerg Med. 2013;62(6):604-608.e1. doi:10.1016/j.annemergmed.2013.06.023
  3. ↑ Carvalho R, et al. Enteroenteric Fistula Following Multiple Magnet Ingestion in an Adult: Case Report, Literature Review and Management Algorithm. Healthcare. 2025;13(19):2523. doi:10.3390/healthcare13192523
  4. ↑ Reeves PT, Nylund CM, Krishnamurthy J, Noel RA, Abbas MI. Trends of magnet ingestion in children, an ironic attraction. J Pediatr Gastroenterol Nutr. 2018;66(5):e116-e121. doi:10.1097/MPG.0000000000001822
  5. ↑ Brown JC, Otjen JP, Drugas GT. Pediatric magnet ingestions: the dark side of the force. Am J Surg. 2014;207(5):754-759. doi:10.1016/j.amjsurg.2013.12.028
  6. ↑ GIKids.org. Magnet Ingestions. North American Society for Pediatric Gastroenterology, Hepatology, and Nutrition. https://gikids.org/digestive-topics/magnet-ingestions/
  7. ↑ 7.0 7.1 7.2 7.3 Hussain SZ, Bousvaros A, Gilger M, et al. Management of Ingested Magnets in Children. J Pediatr Gastroenterol Nutr. 2012;55(3):239-242. doi:10.1097/MPG.0b013e3182687f2f
  8. ↑ Haynes SA, et al. Ultrasound evaluation of intraluminal magnets in an ex vivo model. Pediatr Radiol. 2023;53(12):2418-2426. doi:10.1007/s00247-023-05763-7
  9. ↑ Bailey JR, Eisner EA, Edmonds EW. Unwitnessed magnet ingestion in a 5 year-old boy leading to bowel perforation after magnetic resonance imaging. Patient Saf Surg. 2012;6:16. doi:10.1186/1754-9493-6-16
  10. ↑ 10.0 10.1 Kramer RE, Lerner DG, Lin T, et al. Management of Ingested Foreign Bodies in Children: A Clinical Report of the NASPGHAN Endoscopy Committee. J Pediatr Gastroenterol Nutr. 2015;60(4):562-574. doi:10.1097/MPG.0000000000000729
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