Drowning in Children: Prevention and Emergency Algorithm

Drowning is one of the leading causes of death in childhood worldwide – particularly in children under five years of age. The tragedy often lies in the mundane: an unsupervised moment by the garden pond, a filled bathtub, a pool without safety barriers. As an emergency physician or nurse, you will be confronted in an emergency with a situation that fundamentally differs from other resuscitation scenarios. Drowning is primarily a hypoxic event – and that determines the entire algorithm. This article examines the pediatric specifics of resuscitation after a drowning incident, hypothermia management, and the often underestimated question of why even asymptomatic children should be monitored in hospital after submersion.

Pathophysiology: Why Drowning Is Different

The central pathophysiology in drowning is hypoxia. In contrast to adult cardiac arrest, where a primary arrhythmia is the predominant cause, in drowning it is oxygen deprivation that leads to cardiac arrest. This has direct therapeutic consequences:

• Primary mechanism: Water aspiration → laryngospasm and/or surfactant washout → atelectasis → intrapulmonary right-to-left shunt → hypoxemia → bradycardia → asystole
• Rhythm in cardiac arrest: In the vast majority of cases, asystole or pulseless electrical activity (PEA) is present. Ventricular fibrillation is rare and should prompt consideration of contributing factors such as hypothermia, long QT syndrome, or trauma.
• Fresh water vs. saltwater: The historical distinction between freshwater and saltwater drowning has no practical relevance for initial emergency treatment. Both forms lead to surfactant dysfunction, alveolar damage, and impaired gas exchange.

The Role of Hypothermia

Children cool down faster than adults due to their body surface area to body mass ratio. This hypothermia is both a curse and a blessing:

• Neuroprotective effect: Rapid cooling – particularly during submersion in cold water (< 5 °C) – can drastically reduce cerebral oxygen consumption and improve neurological outcome. There are documented cases with good neurological outcomes after prolonged submersion in cold water.
• Therapeutic consequence: The old rule "Nobody is dead until warm and dead" still applies. Resuscitation must not be terminated due to hypothermia as long as the patient has not been rewarmed to a core temperature of at least 32–35 °C – depending on clinical circumstances.
• Complication: Severe hypothermia (< 30 °C) renders the myocardium refractory to defibrillation and medications. The AHA guidelines recommend a maximum of three defibrillation attempts at core temperatures below 30 °C and withholding medications until rewarming above 30 °C.

Prevention: The Most Effective Therapy

Before we discuss the emergency algorithm in detail, a word on prevention – because no algorithm, however good, can replace preventing the event. As a medical professional, you play a key role in parental counseling:

• Supervision: The single most important factor. Children under five years of age must never be left unsupervised near water – even at shallow depths. As little as 2–3 cm of water depth is sufficient for a toddler to drown.
• Pool safety barriers: Four-sided fencing (at least 120 cm in height) with a self-closing gate has been shown to reduce the risk of drowning by more than 50%.
• Swimming lessons: Recommended from preschool age. Important: Swimming lessons do not replace supervision – they promote water familiarity but do not guarantee safety.
• Education about silent drowning: Drowning is not a loud event. Children typically do not scream or wave – they go under silently. This information is essential for parents and caregivers.
• Household hazards: Rain barrels, garden ponds, paddling pools, open toilets for toddlers – all of these are relevant risk sources that should be addressed during counseling.

Emergency Algorithm: Pediatric Resuscitation After Drowning

Rescue from the Water and Initial Measures

The rescue itself poses dangers – both for the child and the first responder. Basic rule: No personal safety, no rescue. In a professional setting, the following priorities apply:

1. Rescue from the water with consideration of possible cervical spine trauma (particularly in diving incidents or unclear mechanism of injury). Inline stabilization if suspected.
2. Horizontal positioning – lay the child flat. When lifting the child out of the water, ensure the head is not lower than the body to prevent aspirated water from flowing back into the upper airways.
3. Immediate assessment: Consciousness, breathing, circulation following the ABCDE approach.

Ventilation Takes Priority

Since drowning is a hypoxic event, the resuscitation sequence for drowning victims deviates from standard BLS:

• Begin with 5 initial rescue breaths. This is a deliberate deviation from the C-A-B approach used for primarily cardiac causes. In drowning, oxygenation comes first.
• If no signs of life after the 5 rescue breaths: Begin chest compressions at a ratio of 15:2 (with two rescuers) or 30:2 (with a single rescuer), as per the standard PALS algorithm.
• Airway management: Suction liberally. Vomiting and regurgitation of gastric contents and aspirated water can occur at any time. A suction device must be readily available.

Advanced Life Support (ALS) in Pediatric Drowning

Once an ALS team is on scene, the following measures apply:

Airway management:

• Early endotracheal intubation or supraglottic airway device
• In intubated children: PEEP (Positive End-Expiratory Pressure) starting at 5–8 cmH₂O, potentially higher in cases of significant oxygenation impairment
• High FiO₂ initially (1.0), titrate to SpO₂ target (94–99% per PALS)
• Nasogastric tube for gastric decompression (aspiration of swallowed water with consequent gastric dilation is common and impairs ventilation)

Circulatory management:

• Epinephrine 10 µg/kg (0.01 mg/kg) IV/IO every 3–5 minutes during cardiac arrest
• Volume bolus of 20 ml/kg isotonic crystalloid solution if there are signs of hypovolemia or inadequate circulatory status after ROSC (Return of Spontaneous Circulation)
• Monitoring: Capnography (ETCO₂), SpO₂, ECG, blood pressure, temperature

Defibrillation:

• Only for shockable rhythms (VF/pVT), which – as mentioned – are rare
• 2 J/kg initially, 4 J/kg for subsequent shocks, maximum 10 J/kg or adult dose
• In hypothermia < 30 °C: maximum 3 attempts, then prioritize rewarming

Systematically work through reversible causes (Hs and Ts):

H	T
Hypoxia (cause #1!)	Trauma
Hypovolemia	Toxins
Hypothermia	Thrombosis (rare in children)
Hypo-/Hyperkalemia	Tamponade
H⁺ (Acidosis)	Tension pneumothorax

Hypothermia Management in Detail

Core temperature measurement is mandatory in drowning incidents. Esophageal or rectal measurement is recommended – ear thermometers are unreliable in this situation.

Rewarming strategy by severity:

• Mild hypothermia (32–35 °C): Passive rewarming (remove wet clothing, blankets, warm environment). Active external rewarming with warming blankets.
• Moderate hypothermia (28–32 °C): Active external and internal rewarming. Warmed IV fluids (38–42 °C), forced-air warming devices (Bair Hugger or equivalent).
• Severe hypothermia (< 28 °C): The transport destination should be a center with the capability for extracorporeal rewarming (ECMO/ECLS). This is especially important for children in cardiac arrest with hypothermia after submersion in cold water, as the best neurological outcomes can be expected in these cases.

Important: The rewarming rate should not exceed 1–2 °C per hour to minimize afterdrop (further decline in core temperature due to return of cold peripheral blood) and rewarming arrhythmias.

The Underestimated Danger: Secondary Drowning and In-Hospital Monitoring

A clinically highly relevant topic is the question of when a child requires in-hospital monitoring after submersion – even if the child appears asymptomatic at the scene.

When Is Hospital Admission Indicated?

The recommendation is clear: Every child who has been rescued or resuscitated after a submersion event must be monitored in hospital. This also applies to apparently asymptomatic children if any of the following criteria are met:

• Any period of unconsciousness or apnea
• Coughing, dyspnea, or tachypnea – even if transient
• Cyanosis at any point
• Need for ventilation or resuscitation
• Submersion duration > 1 minute or unknown
• Submersion in contaminated water (aspiration of contaminated water increases the risk of pneumonia)

Why Monitor Even Asymptomatic Children?

So-called "secondary drowning" – more accurately described as delayed respiratory deterioration – can occur hours after the event. The pathophysiology includes:

• Surfactant washout with progressive atelectasis formation
• Inflammatory response to aspirated water (chemical pneumonitis)
• Development of non-cardiogenic pulmonary edema (ARDS)

Symptoms can present with a latency of up to 24 hours. Monitoring should therefore last at least 6–8 hours, and longer if any abnormalities are detected. In practice, a monitoring period of 24 hours is recommended for all children with confirmed aspiration or resuscitation.

Monitoring and Diagnostics in Hospital

• Continuous pulse oximetry – a drop in SpO₂ is often the first sign of deterioration
• Blood gas analysis (arterial or capillary) – assessment of oxygenation, ventilation, and acid-base status
• Chest X-ray – Often initially unremarkable but valuable as a baseline. Repeat if clinical deterioration occurs.
• Laboratory diagnostics: Electrolytes (hyponatremia in freshwater aspiration, hypernatremia in saltwater – usually not clinically relevant), complete blood count, CRP, coagulation studies if indicated
• Neurological monitoring: GCS trend, pupillary response, cerebral imaging (CT/MRI) in severe cases

Prognostic Assessment: When Is Limitation of Therapy Justifiable?

The decision to limit therapy after pediatric drowning is one of the most difficult in emergency medicine. The following factors are associated with a poor neurological outcome:

• Submersion duration > 25 minutes in warm water (> 6 °C)
• Resuscitation duration > 25 minutes without ROSC
• Initial asystole without response to therapy
• Absent pupillary response after rewarming
• pH < 6.9 on initial blood gas analysis

However: In hypothermia following submersion in cold water, there are no reliable predictors that justify early limitation of therapy. In these cases, resuscitation must be continued until rewarming is achieved. Decisions regarding limitation of therapy should always be made in an interdisciplinary team and in consultation with a center with ECMO capability.

Summary: The Five Key Points

1. Drowning is a hypoxic event – ventilation has absolute priority. Begin with 5 initial rescue breaths.
2. Hypothermia can be neuroprotective – do not terminate resuscitation prematurely. "Nobody is dead until warm and dead."
3. Prevention is the most effective measure – use every opportunity for parental counseling about supervision and pool safety.
4. In-hospital monitoring is indicated even for asymptomatic children after submersion for at least 6–8 hours.
5. Think early about an ECMO center – in severe hypothermia with cardiac arrest, extracorporeal rewarming is the gold standard.

Hands-On Training

Resuscitation of a child after a drowning incident is one of the most emotionally and technically demanding scenarios in prehospital emergency care and the emergency department. The modified algorithm with ventilation priority, hypothermia management, and interdisciplinary decision-making require regular training under realistic conditions. In the PALS course (Pediatric Advanced Life Support) from Simulation Tirol, you train exactly these scenarios – AHA-certified, evidence-based, and with a focus on structured teamwork that makes the difference when it matters most.