Button-battery and magnet ingestion

Overview & Definition

Button-battery and magnet ingestion describes the accidental, and occasionally intentional, swallowing of a disc or lithium cell battery, or of one or more small permanent magnets, by an infant or child. Both are common, both can be asymptomatic at first, and both can kill within hours of an event the family may not have witnessed. The shared message is that an innocent-looking household object, retained in the oesophagus or trapped between bowel loops, can inflict devastating injury long before the child looks unwell. [1] [3]

The two threats work through different mechanisms but share a single clinical discipline: act on the possibility, image early, and remove an oesophageal battery or attracting magnets before tissue is destroyed. A button battery trapped against the oesophageal mucosa generates hydroxide by electrolysis of tissue water at its negative pole, producing alkaline liquefaction necrosis that worsens by the minute and continues after the battery is removed. Two or more magnets, or a magnet and any ferrous object, attract one another across opposing bowel walls, trapping and ischaemia the intervening tissue until a fistula, perforation or volvulus forms. [1] [9]

[1] [2]

The clinical approach runs inside the broader paediatric primary survey. Airway, breathing and circulation are supported first, because drooling, stridor, haematemesis or a child who cannot protect their airway may signal an oesophageal battery or a complication. The history seeks the object, the time of ingestion, the type and number if known, and any symptoms. A single radiograph confirms the location, distinguishes a battery from a coin, and counts magnets. The plan then divides sharply by location and object: oesophageal battery and attracting magnets are emergencies; a distal, asymptomatic single object can often be observed with planned repeat imaging. [2] [9]

[1] [5]

Classification

Classify the ingestion on three axes at once: what the object is, where it sits, and how many there are. These three answers drive almost every decision that follows, because a battery in the oesophagus behaves nothing like a battery in the stomach, and two magnets behave nothing like one. [2] [9]

[1] [9] [2] [10]

The radiograph itself helps classification. A button battery seen face-on shows a characteristic halo or double-ring caused by the step between the larger positive casing and the smaller negative casing, and on a lateral view a step-off or notch at one edge distinguishes it from a coin. The halo and double-ring signs are the bedside signals that an apparently round radio-opacity is a battery and not a coin, and they should be sought deliberately on every film. [1] [3]

Magnet classification turns on the count. A single magnet carries the low-grade risk of any foreign body, but two or more magnets, or a magnet paired with a coin, battery fragment or other ferrous object, can attract one another through opposing loops of bowel, compressing and ischaemia the trapped wall until a fistula, perforation or volvulus forms. Counting the magnets on imaging, and asking the family how many were in the set, is therefore a clinical act, not a clerical one. [9] [12]

Epidemiology & Risk Factors

Button-battery and magnet ingestions cluster in mobile infants and preschool children who explore the world with their mouths. Button batteries are now ubiquitous in hearing aids, remote controls, toys, flameless candles, watches and key fobs, and the larger twenty-millimetre lithium cells cause the most severe injuries because they are large enough to lodge in a child's oesophagus and powerful enough to injure rapidly. High-powered neodymium magnet sets, sold as desk toys and building sets, are the dominant cause of severe multiple-magnet injuries. [3] [11]

[3] [10] [11]

Severity rises with battery size, with oesophageal position, and with longer contact time. The larger twenty-millimetre lithium cells account for the majority of severe and fatal outcomes, and a battery retained in the oesophagus for more than a few hours carries a steeply rising risk of perforation and fistula. High-powered magnet exposures fell after regulatory action restricting sales, then rose again when those restrictions eased, illustrating how the epidemiology follows the marketplace as much as child behaviour. [11] [10]

Pathophysiology

A button battery injures the oesophageal wall through three converging mechanisms that all intensify the longer the battery remains in contact. The dominant mechanism is electrolysis: the battery, bathed in oesophageal mucus and tissue fluid, acts as a galvanic cell and splits water at its negative pole, generating hydroxide ions that drive a local alkaline burn. Alkali liquefies tissue, so the injury penetrates deeply and progressively rather than forming the limited eschar of an acid burn. The second mechanism is direct-current injury, a low-voltage electrical burn concentrated at the negative pole, and the third is pressure necrosis from the disc-shaped foreign body pressing on the mucosa. [1] [7]

[1] [7]

Two features of this mechanism determine clinical behaviour. First, the injury is time-dependent and begins within minutes to hours, which is why a battery in the oesophagus cannot wait. Second, the damage can continue after the battery is removed, because tissue weakened by alkali liquefaction and electrical injury may necrose and perforate days to weeks later. The most feared late complication is an aorto-oesophageal or tracheo-oesophageal fistula, in which the burn erodes into a great vessel or the airway and presents as massive, often fatal haematemesis or haemoptysis days to weeks after an apparently successful removal. [1] [3]

The honey and sucralfate adjuncts work on this same mechanism. Weak acids such as honey, and the protective coating sucralfate, reduce the pH at the negative pole and limit hydroxide generation, buying time while the child awaits endoscopy. The porcine model evidence is consistent and the human case series is growing, but these are adjuncts, not treatments: they reduce injury only if given early and they never replace emergency removal. [6] [7]

Magnets injure through an entirely different mechanism. Two or more magnets, or a magnet and any ferrous object, attract one another across opposing loops of bowel, compressing and trapping the intervening wall. The compressed wall becomes ischaemic, ulcerates, and eventually fistulates, perforates or twists into a volvulus. Because the magnets can sit silently in separate bowel loops for hours to days before attracting through the walls, a well-looking child can harbour a catastrophic injury, which is why the magnet count, not the symptom count, drives the decision. [9] [12]

Clinical Presentation

The presentation spans the spectrum from a completely well child brought in because a parent saw them swallow something, to a child in shock with airway obstruction, haematemesis or peritonitis. The history matters enormously and is often the only clue, because many events are unwitnessed and the symptoms of an oesophageal battery overlap with common, less dangerous conditions. Ask specifically about the object, the number, the time of ingestion, and the symptoms since. [1] [4]

[3] [4] [10]

Examination begins with the primary survey. Airway obstruction, stridor, drooling, respiratory distress or shock place the child in the emergency pathway and may demand airway protection before any imaging. The abdomen is examined for tenderness, guarding or peritonism that suggests perforation or obstruction from magnets, and the oropharynx is inspected for burns or a retained battery, though a negative mouth inspection never excludes an oesophageal or gastric battery. [4] [8]

A focused history establishes the time window that determines urgency. The single most important question is when the ingestion happened, because an oesophageal battery is an emergency measured in hours. Ask about the source object, the number of batteries or magnets in the household, any symptoms, and any prior ingestions. In a preverbal child, the parent's account of found packaging, a missing battery, or a child playing with a remote control may be the only thread. [1] [11]

Differential Diagnosis

The differential of a round radio-opacity in a child's oesophagus is short but consequential, because mistaking a battery for a coin, or a magnet for a bead, changes the entire plan. Build the differential around what the object is, what it is doing, and what else could cause the symptoms. [2] [3]

[1] [9] [2] [12]

A speakable synthesis sounds like this: "This three-year-old has a round radio-opacity in the upper oesophagus with a halo sign and a step-off on the lateral view, so this is a button battery, not a coin. It has been there for at least three hours, so I am treating this as a time-critical emergency. I have secured the airway and access, the child is over twelve months and can swallow, so I am giving honey as a bridge while I mobilise emergency endoscopy within the two-hour target, and I am keeping aorto-oesophageal fistula, perforation and safeguarding open in parallel." [1] [5]

Clinical & Bedside Assessment

Assess and support airway, breathing and circulation before detailed examination. A child with an oesophageal battery may drool, obstruct, or bleed, and a child with peritonitis from magnets may be in shock; these are the presentations that demand immediate stabilisation and senior help. Keep the child nil by mouth until the object is located, because the plan may change to emergency endoscopy within minutes. [4] [8]

[1] [2]

Examine the radiograph deliberately for the halo and double-ring signs of a battery, and for the step-off or notch at one edge on the lateral view. When magnets are suspected, count them, because the difference between one and two changes the plan from observe to remove. A lateral view helps confirm whether two densities represent a single battery seen end-on or two separate objects. [3] [12]

The history runs in parallel using a focused frame: the object and number if known, the time of ingestion, the source in the home, the symptoms since, any prior ingestions, and the child's developmental background. Ask the parent to bring the device or packaging, because identifying the battery size and chemistry refines the risk. In adolescents, ask privately about intentional ingestion or self-harm when it is safe to do so, because magnet ingestion in this group may be intentional. [1] [10]

After each assessment, state and document one sentence: what the object is, where it sits, how long it has been there, and what you will do next. This spoken synthesis is what examiners listen for, and it keeps the team coordinated as the tempo rises toward removal. [4] [5]

Investigations

Stabilise first, then order investigations that change the immediate plan. The decisive investigation is the plain radiograph; most other tests are conditional on the object, the location, and the child's stability. A normal examination never overrules a battery on the film, and a sick child is never sent to radiology unescorted. [2] [8]

[1] [5]

Interpret the radiograph as mechanism and risk, not as a static picture. A battery in the oesophagus is an emergency regardless of how well the child looks; a battery in the stomach of an asymptomatic child can usually be observed. Two magnets in different loops are high-risk even if the child is well, because the attraction can begin at any time. A repeat film is part of management, not an afterthought, for any object that is observed rather than removed. [2] [9]

[1] [3]

Management — Resuscitation

Suspected battery or magnet ingestion triggers a coordinated response. Declare the concern, call the senior paediatrician, endoscopist, anaesthetist and, where relevant, paediatric surgery and ENT, name a leader, allocate roles, and prepare age- and weight-appropriate equipment and monitoring. Assess and support the airway and circulation, keep the child nil by mouth, and take the localising radiograph while the team assembles. [4] [8]

[1] [5] [1] [6]

The honey and sucralfate bridge

For a child with a suspected or confirmed oesophageal button battery who is older than twelve months, is able to swallow safely, and has no airway compromise, suspected perforation, sepsis or known allergy, give honey 10 millilitres, roughly two teaspoons, by mouth every ten minutes for up to six doses while awaiting endoscopic removal. Sucralfate is the alternative where honey is unavailable or unsuitable, dosed at 1 gram per 10 kilograms of body weight. These adjuncts reduce the pH at the negative pole and limit hydroxide generation, buying time within the removal window. They are never a substitute for endoscopy, they must not delay removal, and honey is contraindicated in infants under twelve months because of the botulism risk. The human evidence remains limited to case series and extrapolation from animal models, so present the adjunct as a promising bridge informed by a systematic review and porcine data, not as a proven standard. [6] [7]

Multiple magnets

Treat two or more magnets, or a magnet paired with a ferrous object, as a high-risk situation even when the child is well. If the magnets are within endoscopic reach in the stomach or proximal duodenum, remove them; if they are beyond endoscopic reach and the child is asymptomatic, observe closely with surgical standby and repeat imaging, removing them if they fail to progress or if any symptoms develop. Never give laxatives or induced emesis, because moving magnets or raised intraluminal pressure can precipitate obstruction or bring attracting magnets into apposition. [9] [12]

Airway protection

A child with stridor, drooling, haematemesis or a threatened airway from an oesophageal battery needs airway protection by an experienced clinician, using a rapid sequence approach and age-appropriate equipment. Anaesthetic considerations are significant: the battery may have caused oedema or a fistula, the airway may be distorted, and the shared airway between anaesthetist and endoscopist must be planned in advance. Never sedate or paralyse a threatened airway without the people and plan to secure it. [8]

[1] [6]

Management — Definitive & Stepwise

After resuscitation and the localising film, move to the definitive plan that matches the object, the location and the count, without stopping reassessment. The oesophageal battery and attracting magnets follow time-critical removal pathways; the distal, asymptomatic single object follows an observation pathway with planned repeat imaging and a clear removal trigger. [2] [5]

[1] [4]

An oesophageal battery is removed endoscopically within two hours, ideally by a senior endoscopist with anaesthetic and surgical or ENT standby. The burn is graded at removal, and the child is admitted for serial observation because delayed perforation and fistula can develop over days to weeks. A battery in the stomach of an asymptomatic child can be observed with a repeat radiograph at four days, and removed if it has not passed or if symptoms develop. A standardised institutional protocol that routes the child from presentation to removal without delay reduces time to removal and is now considered best practice. [5] [1]

Call retrieval or transfer when the child needs endoscopy, surgery or critical care that the local service cannot reliably provide. Discuss the likely support, present monitoring and access, equipment and staff limits, transport time and weather, the safest destination, the escort, expected deterioration, and the plan if transfer is delayed. A child with an oesophageal battery in a rural hospital should not wait for transfer to begin the bridge or the airway plan; start locally and retrieve in parallel. [4] [8]

Specific Subtypes & Scenarios

The assessment framework stays the same, but the object, the location and the child change what you look for and how urgently you act. In each scenario, confirm the object, confirm the location, and activate the correct pathway while running safeguarding and prevention in parallel. [1]

[3] [9] [10] [12] [1] [10] [11]

Complications & Pitfalls

Most harm begins when an oesophageal battery is not recognised as time-critical, when the adjunct is mistaken for treatment, or when the magnet count is not taken seriously. The most preventable error is waiting on an oesophageal battery because the child looks well, because severe injury can begin within two hours of contact and the risk rises steeply thereafter. The second is assuming the honey bridge has solved the problem and delaying endoscopy. [1] [6]

[1] [3] [9]

Watch for anchoring on a reassuring symptom or a normal examination. A well child with a battery in the oesophagus is still an emergency, and a well child with two magnets in different loops is still high-risk. After removal, look actively for delayed harm: perforation, mediastinitis, fistula, stricture and recurrent laryngeal nerve palsy. The fact that the battery came out whole does not prove the injury has stopped. [1] [4]

[1] [6] [9]

Prognosis & Disposition

Disposition follows the object, the location, the burn grade at removal, and the support the child needs. Consider the time to removal, the severity of the injury, the risk of delayed complications, local resources, transport risk, and the family's ability to carry out the plan and the prevention advice. [1] [5]

[1] [4]

A safety net states what change to watch for, how urgently to act, and exactly where to get help. It names the warning signs of delayed perforation and fistula — chest pain, fever, haematemesis, dysphagia, abdominal pain — and the route back to care. Check understanding with teach-back, document it, and connect the family to primary care and the prevention pathway. After a severe event, explain what happened and what remains uncertain, invite questions, and consider debriefing for the child, family and team. [1] [3]

Special Populations

Adapt how you assess, communicate and prevent, but never lower the standard for recognising a time-critical battery or attracting magnets. Evidence is sparse for ingestion patterns in disability, pica and many low-resource settings; present these adaptations as safer practice, not as proven improvements in outcome. [3] [11]

[3] [10] [11]

Prevention is part of acute care, because recurrence is common and the household hazard usually persists. Counsel the family to secure battery compartments with tape and screwdrivers, to keep spare batteries and magnets out of reach, to buy child-resistant packaging, and to share the message with carers and family. Safeguarding runs in parallel when ingestion is recurrent, when supervision is inadequate, or when the history is inconsistent; immediate stabilisation and safety come first, followed by objective documentation and the local pathway. [3] [11]

Evidence, Guidelines & Regional Differences

What the evidence can and cannot support

The two-hour removal target for oesophageal button batteries, the alkaline-liquefaction mechanism, and the high-risk status of multiple magnets are consensus across the major guidelines. The NASPGHAN Endoscopy Committee clinical report and the ESPGHAN position paper frame the management of ingested foreign bodies and button batteries, and institutional protocols that reduce time to removal are associated with better outcomes. What differs across sources is the detail of the honey and sucralfate adjuncts, the repeat-imaging interval for observed batteries, and the operative thresholds for magnets beyond endoscopic reach, which are source- and setting-specific. [1] [2]

[6] [7]

High-powered magnet injuries follow the marketplace: exposures fell when sales were restricted and rose again when restrictions eased, which is why regulation is treated as a public-health intervention alongside clinical care. Delayed complications after battery removal — aorto-oesophageal fistula, stricture, tracheo-oesophageal fistula — remain the leading causes of death, and their recognition days to weeks after an apparently successful removal is a core teaching point. [11] [3]

There is no universal repeat-imaging interval, adjunct dose, or magnet-removal threshold that fits every child and every setting. Attach each rule to its population, purpose, conditions and jurisdiction, and quote the local source rather than inventing precision. [1] [9]

Jurisdictional implementation

[1] [3] [2] [11] [3] [1]

Exam Pearls

[1] [2] [9]

Viva: the drooling three-year-old

Do not wait for the child to look unwell. Confirm the ingestion and time, secure the airway and access, take one radiograph nasopharynx to anus, and if there is a halo sign in the oesophagus arrange emergency endoscopic removal within two hours. Give honey as a bridge in the eligible child while you mobilise the team, and keep aorto-oesophageal fistula, perforation and safeguarding open in parallel.

[1] [5]

Viva: the well child with two magnets

A well child with two or more magnets is still high-risk, because the magnets can attract across bowel walls at any time and cause fistula, perforation and volvulus. Remove if within endoscopic reach; if beyond reach, observe closely with surgical standby and repeat imaging, and remove if they fail to progress or if any symptoms develop. Do not give laxatives or induced emesis.

[9] [12]

Structured oral: late haematemesis after a battery removal

Massive haematemesis days to weeks after a battery removal is an aorto-oesophageal fistula until proven otherwise and is often fatal. Mobilise endovascular and surgical teams immediately, do not pass a nasogastric tube blindly, and arrange CT angiography if the child is stable enough. The lesson is that delayed complications after removal are the leading cause of death, and surveillance must continue for weeks.

[1] [3] [1] [2] [6] [9] [1] [3] [6] [9]

References

1. [1]Mubarak, Marwan Diagnosis, Management, and Prevention of Button Battery Ingestion in Childhood: A European Society for Paediatric Gastroenterology Hepatology and Nutrition Position Paper Journal of pediatric gastroenterology and nutrition, 2021.PMID 33555169
2. [2]Kramer, Robert E Management of ingested foreign bodies in children: a clinical report of the NASPGHAN Endoscopy Committee Journal of pediatric gastroenterology and nutrition, 2015.PMID 25611037
3. [3]Eliason, Melisa J Button battery ingestion in children Current opinion in otolaryngology and head and neck surgery, 2017.PMID 28858893
4. [4]Funk, Erin M Button Battery Ingestion in Children: An Educational Review for Perioperative Nursing Journal of perianesthesia nursing, 2025.PMID 38878031
5. [5]Goh, Samuel Pediatric Esophageal Button Battery Protocol Reduces Time From Presentation to Removal The Laryngoscope, 2024.PMID 38934450
6. [6]Schmidt, Yannick M The use of honey in button battery ingestions: a systematic review Frontiers in pediatrics, 2023.PMID 37842023
7. [7]Chiew, Andis Graeme Home Therapies to Neutralize Button Battery Injury in a Porcine Esophageal Model Annals of emergency medicine, 2024.PMID 37725021
8. [8]Eck, James B Anesthetic Implications of Button Battery Ingestion in Children Anesthesiology, 2020.PMID 32011339
9. [9]Altokhais, Turki Magnet Ingestion in Children Management Guidelines and Prevention Frontiers in pediatrics, 2021.PMID 34422734
10. [10]Seguier-Lipszyc, Elhanan Multiple magnet ingestion in children: A problem on the rise Journal of paediatrics and child health, 2022.PMID 35841278
11. [11]Middelberg, Leah K Warning Labels and High-Powered Magnet Exposures Pediatrics, 2022.PMID 36189482
12. [12]Han, Younghoon Ingestion of multiple magnets in children Journal of pediatric surgery, 2020.PMID 31937446