Paeds · acute-care-resuscitation-and-toxicology
Submersion injury and hypothermia
Also known as Drowning · Non-fatal drowning · Submersion injury · Cold water immersion · Accidental hypothermia · Hypothermic submersion cardiac arrest
Fellowship guide to submersion injury (drowning) and hypothermia in children: the van Beeck definition, the Szpilman severity stratification, the asphyxial and cold-water pathways, the rescue-breath-first and rewarming ladders, hypothermic cardiac arrest ('warm and dead'), prognostic factors, and drowning prevention.
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Target exams
Red flags
- Child pulled from water unresponsive and not breathing normally — start the drowning resuscitation sequence with five rescue breaths
- Submersion time longer than five to ten minutes, or cold-water submersion of any duration — resuscitate fully and do not declare death at the scene
- Core temperature below 30 degrees Celsius with ventricular fibrillation — handle gently, give one shock, then rewarm before further shocks
- Frothy pulmonary oedema, hypoxaemia out of proportion to examination, or worsening over the first four hours — evolving lung injury needing respiratory support
- Pulseless, cold, submersed child — continue cardiopulmonary resuscitation until the core is warm (at least 32 degrees) before considering stopping
- Cervical spine injury suggested by a dive, a slip, or a fall — protect the spine while opening the airway
- Unwitnessed or inconsistent history, or a delay in seeking care in a young child — consider non-accidental injury and safeguarding
Life stages
Care settings
Clinical exam formats
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- Recognition and immediate management of the submerged child, including the five-rescue-breath sequence
- Assessment and staging of hypothermia in a child
- Drowning prevention and water-safety counselling
- Resuscitation of drowning and hypothermic submersion cardiac arrest, including extracorporeal rewarming
- Active rewarming strategies and the management of hypothermic arrhythmia
- Prognostication and the decision to continue or terminate prolonged resuscitation
- Drowning definition, the Szpilman severity grades and their mortality
- Hypothermia staging (Swiss I to IV) by core temperature and clinical state
- The rewarming ladder and the defibrillation and drug rules for hypothermic arrest
- Short case: the child pulled cold and pulseless from a pool
- Communication: prognostic uncertainty, prolonged resuscitation and organ donation discussion
- Acute care: resuscitation of the drowned and hypothermic child
- Public health: drowning prevention, pool fencing and water safety
- Safeguarding: unwitnessed submersion and non-accidental injury
- The van Beeck definition of drowning and the obsolete terms it replaces
- Hypothermia physiology, staging and the rewarming ladder
- Evidence base for prognostic factors and extracorporeal rewarming
- Resuscitation scenario: hypothermic submersion cardiac arrest
- Communication: breaking bad news after a catastrophic drowning
- Drowning resuscitation and the rescue-breath-first algorithm
- Accidental hypothermia staging and rewarming
- Drowning prevention (AAP policy)
- Patient Care: resuscitation of the submerged and hypothermic child
- Medical Knowledge: cold-water protective physiology and the asphyxial cascade
- Systems-Based Practice: drowning prevention and retrieval of the cold child
- Medical Expert: management of drowning and accidental hypothermia
- Health Advocate: water safety and pool fencing
- Collaborator: retrieval and extracorporeal rewarming referral
Overview & Definition
A four-year-old is carried into the emergency department blue and limp, pulled from a backyard pool minutes before, and a teenager arrives cold and unconscious after falling through winter ice into a lake. These are the two faces of submersion injury, and the decisions in the first minutes decide whether the child survives intact, survives disabled, or dies. Submersion injury is the umbrella term for the harm that follows being under or in water; drowning is now defined, since the 2002 World Congress on Drowning and the van Beeck consensus, as the process of experiencing respiratory impairment from submersion or immersion in liquid, with outcomes classified as death, morbidity, or no morbidity. [1]
The definition was written deliberately to kill off a vocabulary that muddles care and prognosis. The terms near-drowning, secondary drowning, wet and dry drowning, and active versus passive drowning are obsolete and must not be used, because they describe neither mechanism nor severity and they obscure outcome reporting. A child either drowned and died, drowned with morbidity, or drowned without morbidity — there is no "near" about it. The standardised Utstein template then asks every rescuer to record the time intervals — submersion time, time to first rescue breath, scene time, and return of spontaneous circulation — because submersion duration is the single strongest predictor of survival. [2]
Two mechanisms run in parallel in the submerged child. The first is asphyxia: liquid in the airway triggers laryngospasm or floods the alveoli, gas exchange stops, oxygen falls, and the heart slows and arrests from hypoxia. The second is temperature: cold water cools the body, and in the right circumstances that cooling protects the brain by lowering its metabolic demand. These two mechanisms explain why a child pulled cold and pulseless from ice water can sometimes recover intact after an hour, and why a warm-water drowning of the same duration is usually fatal. Drowning and hypothermia must therefore be assessed and managed together, not separately. [1] [6]
References12ShowHide
- [1]van Beeck EF A new definition of drowning: towards documentation and prevention of a global public health problem. Bull World Health Organ, 2005.PMID 16302042
- [2]Idris AH Recommended guidelines for uniform reporting of data from drowning: the "Utstein style". Circulation, 2003.PMID 14623794
- [3]Szpilman D Near-drowning and drowning classification: a proposal to stratify mortality based on the analysis of 1,831 cases. Chest, 1997.PMID 9315798
- [4]Markarian T Drowning Classification: A Reappraisal of Clinical Presentation and Prognosis for Severe Cases. Chest, 2020.PMID 32067943
- [5]Lott C European Resuscitation Council Guidelines 2021: Cardiac arrest in special circumstances. Resuscitation, 2021.PMID 33773826
- [6]Brown DJ Accidental hypothermia. N Engl J Med, 2012.PMID 23150960
- [7]Darocha T Accidental hypothermia. Nat Rev Dis Primers, 2026.PMID 42393082
- [8]Saczkowski RS Prediction and risk stratification of survival in accidental hypothermia requiring extracorporeal life support: An individual patient data meta-analysis. Resuscitation, 2018.PMID 29580960
- [9]Anadolli V Management of hypothermic submersion associated cardiac arrest in a 5-year-old child: A case report. Resusc Plus, 2021.PMID 34485955
- [10]Shenoi RP Prehospital and Resuscitation Factors Associated With Favorable Pediatric Drowning Outcomes. Pediatr Emerg Care, 2025.PMID 40129133
- [11]Denny SA Prevention of Drowning. Pediatrics, 2021.PMID 34253571
- [12]Koon W Studying outcome predictors of drowning at the scene: Why do we have so few answers? Am J Emerg Med, 2021.PMID 33069542