Educational draft · awaiting clinical reviewThe full textbook explains uncertainty but does not replace live national or local guidance, specialist advice, or current prescribing information.
Sudden unexpected death in infancy and childhood
Paediatrics and child health · UK scope · Sources checked 27 Aug 2026 · Clinical review pending
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Unresponsive child with no signs of life
An unexpected collapse is treated as potentially reversible unless death is unequivocal or a valid agreed limitation applies. The scene may contain vital diagnostic and safeguarding information.
Action: Call the resuscitation team and begin age-appropriate life support, treating reversible causes and following local policy on termination with senior oversight. After death, leave tubes and lines in place unless removal is explicitly agreed, document every intervention and finding, preserve clothing and medical material, notify police and the coroner through the Joint Agency Response and provide the family with a named professional and private compassionate support.
Overview
Respond safely and compassionately to an unexpected child death, preserve diagnostic and forensic information, initiate the statutory multi-agency process, support the family and enable specialist post-mortem, genetic and child-death review learning.
At first contact, safety and reversibility come first. Confirm the scene is safe, use paediatric BLS and ALS, check glucose and temperature and treat plausible reversible causes. Hypothermia can make pulse and breathing extremely difficult to detect. Decisions to stop resuscitation require the senior clinical lead and current policy, considering witnessed status, response, temperature, cause and any valid advance plan.
Once death is confirmed, the emergency department becomes both a place of care and part of a statutory investigation. Notify the consultant paediatrician, police and coroner through the local Joint Agency Response and inform the child-death team and safeguarding services. Police attendance is routine and should be explained compassionately; it does not mean the parents are accused.
Preserve information. Record who accompanied the child, the condition of clothing and nappy, temperature, lividity, rigor, secretions, injuries and all resuscitation changes. Leave endotracheal tubes, vascular lines and dressings in situ unless removal is explicitly agreed with the coroner or pathologist. Secure clothing, medicines and samples with documented chain of custody. Clinical photographs follow policy and consent or legal authority.
Practice
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Paediatrics and child healthOriginal SBA
Preserving information after unexpected death
Resuscitation of an unexpectedly collapsed infant is stopped after senior review. What is the most appropriate immediate approach?
Sources and review status5 sources · checked 27 Aug 2026 · clinical review pending+
Sources
Sources and review status
National guidance is shown before implementation-dependent detail. Apply principles in context and verify current guidance when a decision affects care. Source check completed 27 Aug 2026; clinical approval remains outstanding.
Editorial contact: Doctor’s Passport editorial team. Source-check date is separate from clinical approval. Report a content problem ·
Obtain a detailed, non-judgmental account, preferably through the coordinated professional process to avoid repeated interviews. Cover the preceding days, infection, feeding, vomiting, sleep, behaviour, medications and access to substances; pregnancy, birth, development and immunisation; past events and services; family sudden deaths, epilepsy, deafness or metabolic disease; and the last sleep, exact position, bedding, room, heating, smoking, alcohol, drugs, supervision, discovery and resuscitation.
The senior paediatric examination is head to toe and fully documented. Record weight, length and head circumference, nutrition and hygiene, congenital features, skin and mucosa, mouth and frenula, eyes, scalp, genital and anal findings when indicated, injuries, medical-device marks and post-mortem change. Findings are described, measured and mapped without assigning mechanism beyond competence.
The diagnostic reference standard is the combined investigation, not one test. It includes the history and home or death-scene examination, clinical records, specialist paediatric post-mortem with histology, microbiology, toxicology, radiology and metabolic or genetic studies as indicated, followed by a multi-agency final case discussion. Samples must follow local SUDI protocol and pathologist direction; indiscriminate or late sampling can be misleading.
Consider the living family. A structurally normal post-mortem does not exclude channelopathy. Sudden exertional or sleep death, seizures, prior faints, deafness or young family deaths should prompt inherited-cardiac review, ECG assessment of first-degree relatives and retained DNA-quality material. Metabolic specialists advise urgent samples and sibling precautions when fasting illness, hypoglycaemia or previous unexplained deaths suggest inherited disease.
Care is honest, private and paced. Use the child's name, acknowledge uncertainty, offer interpreter, faith and cultural support, memory-making and time with the child when compatible with investigation. Provide a named key worker and written contacts, notify primary care and relevant professionals, and proactively follow siblings and parental mental health. The child death overview process reviews modifiable factors and feeds learning back without waiting for blame.
Key points
SUDI or SUDC describes the presentation, not the cause; SIDS or an unexplained classification comes only after complete investigation.
Start paediatric life support unless death is unequivocal or a valid limitation applies; seek senior help for any doubt.
Resuscitation and evidence preservation coexist: record state on arrival, timings, access sites, fluids and medicines and retain tubes, lines, clothing and samples under protocol.
Activate the statutory Joint Agency Response promptly through police, coroner, paediatrics, social care and the child-death review system.
The reference-standard cause investigation is multi-agency: detailed history, scene examination, full paediatric examination, appropriately sampled specialist post-mortem and final case review.
Take a careful sleep, feeding, illness, medicine, pregnancy, birth, development, family, social and event history; record who found the child and the exact position and environment.
Perform and document a complete external examination including growth, temperature, skin, mouth, eyes, injuries and post-mortem changes with an agreed senior and police process.
Do not assume normal resuscitation artefacts are injuries and do not ascribe all injuries to CPR without expert assessment.
Aetiology
01
Natural explained disease
Previously unrecognised infection, congenital heart disease, epilepsy, metabolic disease, intracranial pathology and other medical conditions may explain sudden death.
02
Accidental or environmental cause
Airway obstruction, unsafe sleep environment, drowning, fire, poisoning, trauma and temperature exposure may be causal or contributory.
03
Inflicted injury or neglect
Deliberate suffocation, occult trauma, poisoning or serious supervisory neglect must be investigated objectively within the same pathway as natural causes.
04
Unexplained death
SIDS in an infant or sudden unexplained death in childhood is a diagnosis of exclusion after complete history, scene review and specialist post-mortem investigation.
Pathophysiology
1
Final common pathways
Hypoxia, malignant arrhythmia, seizure-related respiratory failure, shock or raised intracranial pressure can produce the same terminal appearance.
2
SIDS vulnerability model
A developmentally vulnerable infant may encounter an external stressor during a critical maturational period and fail protective arousal or cardiorespiratory responses.
3
Inherited electrical disease
Channelopathies can cause fatal ventricular arrhythmia with a structurally normal heart and no macroscopic post-mortem clue.
4
Metabolic decompensation
Fasting or intercurrent illness can trigger hypoglycaemia, hyperammonaemia, acidosis or arrhythmia in an undiagnosed inherited disorder.
Clinical features and red flags
Unexpected presentation
Death was not anticipated as a significant possibility in the preceding 24 hours or occurred unexpectedly during care or sleep.
Unequivocal death
Findings such as decomposition or injuries incompatible with life can make resuscitation inappropriate; uncertainty receives active resuscitation and senior input.
Potential natural clue
Fever, respiratory or gastrointestinal illness, seizures, poor growth or family history guides sampling but cannot establish cause before full investigation.
Potential environmental clue
Sleep position, soft bedding, entrapment, room heat, smoke, substances or water exposure is documented objectively at the scene.
Potential safeguarding clue
Injury, neglect, inconsistent account or delayed care prompts multi-agency protection while maintaining neutral communication.
Red flags requiring action
Any uncertainty about signs of life, temperature-related apparent death, poisoning or a reversible cause requires resuscitation rather than premature verification.
An unsafe scene, possible carbon monoxide, hazardous substance or ongoing threat requires emergency-service scene control before entry.
01First-line resuscitation diagnosticsFirst stepFirst line
Why
Identify reversible hypoglycaemia, hypothermia, arrhythmia, electrolyte disorder, poisoning or infection during active care.
Interpretation and limitations
Testing is cause-directed and must not interrupt ventilation, compressions or correction of a reversible emergency.
02Coordinated history and scene examination
Why
Reconstruct the final sleep or event, environment, timeline, development, supervision and medical context.
Interpretation and limitations
Contemporaneous scene findings are irreplaceable and are interpreted jointly rather than from photographs or recall alone.
03Complete paediatric examination and documentation
Why
Record growth, disease signs, injury, interventions and post-mortem change.
Interpretation and limitations
Descriptive findings are separated from causal conclusions and reviewed with pathology and police information.
04Early protocol-led clinical samples
Why
Preserve material for microbiology, toxicology, metabolic testing and DNA before degradation.
Interpretation and limitations
Choice, volume, handling and chain of custody follow the local SUDI protocol and coroner or pathologist direction.
Differential diagnosis
01
Apparent life-threatening event
Profound hypothermia, intoxication, seizure or severe hypoglycaemia can mimic death and must be actively excluded during initial assessment.
02
Explained natural death
Integrated history, examination, microbiology, imaging and post-mortem testing may establish infection, cardiac, neurological or metabolic disease.
03
Accidental asphyxia or injury
Scene reconstruction may identify entrapment, overlay, ligature, foreign body, drowning or trauma but terminology must not pre-empt evidence.
04
Unlawful killing or neglect
The possibility is assessed through police, paediatric, pathology and social-care evidence rather than bedside inference alone.
05
SIDS or unexplained childhood death
This conclusion is reached only when the full investigation finds no adequate cause, with contributory factors recorded separately.
Management
01Initial responseResuscitate if in doubtFirst stepA child is unexpectedly found unresponsive without signs of life.+
1Ensure scene safety, call emergency help and begin paediatric life support.
2Check temperature, glucose and reversible causes without interrupting resuscitation.
3Use senior and current policy for any termination decision.
4Document the child as found and every intervention precisely.
02After deathCare and preserveDeath is verified after an unexpected collapse.+
1Notify consultant paediatrics and activate the Joint Agency Response.
2Leave lines and tubes, secure clothing and samples and maintain chain of custody.
3Complete a coordinated history and full external examination.
Complications
01
Missed familial disease
Failure to retain suitable samples or refer relatives can leave siblings and parents at preventable cardiac or metabolic risk.
02
Forensic information loss
Removing lines, washing clothing, incomplete scene history or poorly labelled samples can prevent a reliable causal conclusion.
03
Family traumatic grief
Sudden death, police involvement, prolonged uncertainty and self-blame increase complicated grief, trauma, relationship strain and mental-health risk.
04
Safeguarding failure
Poor information sharing can leave siblings unsafe, while premature accusation can cause profound avoidable harm; structured multi-agency investigation protects both.
05
Missed system learning
Incomplete child-death review loses opportunities to improve healthcare, housing, safe sleep, product safety and community prevention.
Monitoring and follow-up
During resuscitation document rhythm, airway, temperature, glucose, doses, times and response in real time.
After death maintain a continuous record of who handles the child, clothing, samples and devices.
Track completion and ownership of police, coroner, safeguarding, primary-care and child-death notifications.
Ensure preliminary and final post-mortem information reaches the named paediatric professional and family through an agreed plan.
Follow siblings for urgent clinical or genetic risk when the history suggests infection, metabolic disease or channelopathy.
Proactively review parental and sibling grief, trauma, sleep, safety and access to psychological or spiritual care.
Record action ownership and completion from the final case review and Child Death Overview Panel.
Special situations
Presentation is not diagnosis
SUDI and SUDC describe unexpected death; SIDS is a conclusion after exclusion, not an emergency-department label.
Routine investigation is not accusation
Explaining police and coroner roles openly can reduce fear while preserving an independent process.
Do not tidy away evidence
Lines, clothing, nappies and exact scene details may distinguish disease, resuscitation artefact and injury.
A normal heart can still be electrical
Channelopathy requires retained DNA and family evaluation even when post-mortem structure is normal.
The family needs a route back
A named professional prevents parents being left to navigate pathology, coroner, police and health services alone.
Common pitfalls
01
Assuming death when severe hypothermia may mimic absent signs of life.
02
Calling the death SIDS before full investigation.
03
Removing tubes, washing the child or discarding clothing without agreement.
04
Taking poorly labelled samples without timing or chain-of-custody documentation.
05
Repeatedly interviewing parents independently with inconsistent questions.
06
Equating routine police involvement with evidence of parental guilt.
07
Attributing all marks to CPR or all injuries to abuse without expert integration.
08
Failing to retain DNA-quality material in an unexplained death.
09
Waiting for final pathology before supporting siblings and bereaved carers.
Retain blood, urine and other samples early according to the multi-agency protocol because post-mortem degradation can limit metabolic and toxicological diagnosis.
Offer parents clear honest updates, time with the child where safe, memory-making and cultural or spiritual care; explain that police and coroner involvement is routine.
A sudden or unexplained death can indicate inherited arrhythmia or metabolic disease: preserve DNA-quality material and refer the family to specialist services.
Complete child-death review and communicate final findings sensitively; provide bereavement, primary-care and sibling follow-up with a named key worker.
Sudden death during exertion, in water, with a family history of young sudden death or with a normal post-mortem raises inherited cardiac disease and family-screening urgency.
Unexpected death with infection features, multiple affected people or public-health concern requires prompt microbiology and health-protection advice.
Parents must not be told that sudden infant death syndrome is the cause before the complete investigation and case review.
05
Specialist paediatric post-mortem
Why
Use external and internal examination, histology, radiology and targeted laboratory and genetic work to seek a cause.
Interpretation and limitations
A negative structural examination does not exclude electrical cardiac or metabolic disease.
06Reference-standard final multi-agency case review
Why
Integrate scene, history, clinical care, post-mortem, toxicology, genetics and safeguarding evidence.
Interpretation and limitations
Only this integrated process can support explained, unexplained or contributory-factor classification and prevention recommendations.
4
Give the family privacy, explanation, memory and cultural support with a named contact.
03Cause investigationScene to specialist post-mortemThe death remains unexpected and unexplained at presentation.+
1Coordinate police, coroner, paediatrician, pathologist and social care.
2Use protocol-led scene review, records, imaging and laboratory samples.
3Arrange specialist paediatric post-mortem with appropriate ancillary testing.
4Integrate findings at the final multi-agency case discussion and child-death review.
04Family protectionScreen, support and learnAn inherited cause is possible or the family enters bereavement follow-up.+
1Retain suitable DNA material and refer for inherited cardiac or metabolic advice.
2Assess siblings' immediate health and safeguarding needs.
3Provide bereavement and mental-health support through a named key worker.
4Communicate final findings and prevention learning sensitively to family and professionals.