Drowning pathophysiology, SAFE rescue approach, rescue breathing as first intervention, hypothermia management, secondary drowning observation and GCC-specific pool and beach emergency context.
Drowning is defined as the process of experiencing respiratory impairment from submersion or immersion in a liquid medium (WHO/Utstein 2002). The outcome may be death, morbidity (non-fatal drowning), or no morbidity.
Obsolete terminology: The terms "wet drowning," "dry drowning," "near-drowning," "passive drowning," and "secondary drowning" are obsolete and should not be used clinically — they have been replaced by the unified drowning definition. However, "secondary drowning" is still used colloquially to describe delayed pulmonary oedema.
Pathophysiology Sequence
Panic and breath-holding: Victim struggles, hyperventilates, swallows water
Clinical reality: Both salt water and fresh water aspiration cause non-cardiogenic pulmonary oedema and severe hypoxia. The electrolyte and haematological differences are less clinically significant than the shared mechanism of alveolar damage. Treat both the same way — prioritise oxygenation.
Prognostic Factors
Favourable Prognosis
Factor
Why Beneficial
Submersion <5 minutes
Less hypoxic brain injury before rescue
Cold water (<20°C)
Cerebral hypothermia — reduces O₂ demand, protective against anoxic injury
Prompt CPR initiated at scene
Maintains cerebral circulation until ROSC
Young age (especially children)
More physiological reserve; diving reflex more pronounced
No trauma
Avoids additional pathology (spinal cord injury, head injury)
Witnessed submersion
Earlier rescue; accurate time of submersion known
"No one is dead until warm and dead." In cold water submersion, resuscitation should continue until core temperature is rewarmed to ≥32°C. Survival with good neurological outcome has been reported after 60+ minutes of cold water submersion in children.
Rescue Assessment — SAFE Approach
SAFE Rescue Sequence
The safety of rescuers is the absolute priority. Untrained persons who enter water to rescue drowning victims frequently become drowning victims themselves.
SShout for help / Signal — call emergency services (995 in UAE, 911 in KSA, 999 in Qatar); alert lifeguard if present; do not attempt rescue alone
AAssess scene safety — assess water conditions (current, depth, hazards); assess your own swimming ability; assess what caused the drowning (electrical fault = electrocution risk; chemical spill = toxic exposure)
FFloat aid if possible — throw a float, rope, towel, or any buoyant object to the victim; use extension reach (pole, scarf, belt) from the poolside or bank without entering water
EEnter water ONLY if trained — trained lifeguards with buoyancy aid (rescue tube) should perform water rescue; approach from behind victim to avoid being pulled under; if no buoyancy aid, use a shirt/towel as a tow line
On-Scene Assessment After Rescue
Responsiveness: Call name, tap shoulders — unresponsive = begin resuscitation
Breathing check: Look, listen, feel for no more than 10 seconds
Spinal injury assessment: If history of diving, fall from height, surfboard accident, or mechanism unclear — ASSUME cervical spine injury until proven otherwise
Hypothermia: All drowning victims are hypothermic until proven otherwise — assess for shivering, altered consciousness, cold skin
Traumatic injuries: Head/face wounds, signs of fracture, altered pupils
Spinal precautions in water: If C-spine injury suspected, maintain in-line stabilisation. However, do NOT delay rescue breathing for spinal precautions — the priority is oxygenation. Perform jaw thrust with manual C-spine stabilisation if trained to do so.
Resuscitation — Drowning is DIFFERENT from Adult Cardiac Arrest
Why Drowning Resuscitation Differs
KEY DIFFERENCE: Drowning causes PRIMARY HYPOXIC cardiac arrest — the heart stops because of lack of oxygen, not because of primary VF/VT as in adult sudden cardiac arrest. Therefore, RESCUE BREATHING (oxygenation) is the priority — give 5 RESCUE BREATHS FIRST before commencing chest compressions.
Standard adult BLS begins with chest compressions (CAB sequence). Drowning reverses this: ABCDE — Airway and Breathing first.
1
5 Rescue breaths — Begin rescue breathing immediately upon removing victim from water (or in water if trained); use mouth-to-mouth or bag-valve-mask; each breath over 1 second, watching for chest rise
2
Check for signs of circulation — pulse for up to 10 seconds; if absent → begin chest compressions 30:2 ratio
3
Continue CPR — standard 30:2 compressions to rescue breaths; attach AED as soon as available; shockable rhythm less common in drowning but AED should still be used
4
Transfer to hospital — all drowning patients require hospital assessment; continue CPR en route; never declare death at scene in cold water submersion
Hospital Management
Position: Horizontal — do NOT tilt head-down to "drain water"; this wastes time and is ineffective
Airway: Suction if copious secretions; RSI and intubation if GCS ≤8 or respiratory failure
Oxygen: High-flow O₂ via NRB mask; target SpO₂ 94–98%
CPAP/NIV (BiPAP): For pulmonary oedema with adequate respiratory effort — reduces need for intubation
ARDS management: If mechanically ventilated — lung protective ventilation (6 mL/kg tidal volume, PEEP 5–10 cmH₂O, FiO₂ to maintain SpO₂ ≥88%)
Warming: Remove all wet clothing; warmed blankets; warmed IV fluids (42°C); warm humidified O₂; active rewarming if core temp <35°C
Electrolyte correction: Check Na⁺, K⁺, Cl⁻, Ca²⁺ — particularly important in large-volume fresh water aspiration
Immersion in cold water causes rapid heat loss (water conducts heat 25× faster than air). Core temperature in drowning victims often <32°C, causing additional complications.
Hypothermia may be protective — cerebral cooling reduces metabolic demand; accounts for miraculous survivals in cold water
Core temperature <28°C: cardiac arrhythmias (AF, VF); reduced drug metabolism; pulse difficult to detect (check for up to 1 full minute)
"No one is dead until warm and dead" — resuscitate until core temperature ≥32°C is achieved
Active internal rewarming if core temp <30°C in cardiac arrest: warmed IV fluids, warmed gastric/bladder lavage, ECMO (most effective for severe hypothermia)
Defibrillation: if in VF/pVT — first 3 shocks; withhold further shocks until core temp >30°C (defibrillation less effective at low temperatures)
Secondary Drowning (Delayed Pulmonary Oedema)
Any person who has experienced a submersion event, even if they appear well and recovered at the scene, may develop pulmonary oedema hours later due to surfactant destruction and delayed inflammatory response in the alveoli.
Mandatory 24-hour observation: All drowning patients who are rescued and appear to have recovered should be observed for a minimum of 24 hours in hospital. Warning symptoms: increasing shortness of breath, worsening cough, decreasing SpO₂, increasing agitation — any of these hours after apparent recovery warrant immediate investigation and treatment.
CXR at presentation and repeat if symptoms worsen
SpO₂ monitoring continuously during observation period
Discharge criteria: SpO₂ ≥95% on room air, no respiratory symptoms, normal CXR, fully alert — after minimum 6–8 hours asymptomatic (many centres keep 24 hours)
Complications of Drowning
Pulmonary Complications
Complication
Mechanism
Management
Non-cardiogenic pulmonary oedema
Surfactant destruction + alveolar flooding
CPAP/NIV, O₂, lung protective ventilation
ARDS
Diffuse alveolar damage, inflammatory cascade
Low tidal volume ventilation, prone positioning if P/F <150
Aspiration pneumonia
Contaminated water (pool chemicals, bacteria)
Antibiotics if evidence of infection (NOT prophylactic)
Bronchospasm
Reflex bronchoconstriction from water aspiration
Nebulised salbutamol, IV hydrocortisone
Neurological Complications
Hypoxic brain injury: Degree proportional to submersion time and water temperature; GCS on admission is prognostic indicator
Cerebral oedema: Following resuscitation — ICP monitoring in severe cases; target CPP >60 mmHg
Seizures: Post-hypoxic; benzodiazepine treatment; levetiracetam for prophylaxis in severe cases
Spinal cord injury: From diving injuries; any deficit requires full spinal immobilisation and urgent MRI
Prognostic caution: Neurological recovery in drowning victims — especially children in cold water — can exceed expectations. Avoid premature withdrawal of care without thorough neurological assessment after rewarming to normothermia.
Cardiovascular Complications
Cardiac arrest from primary hypoxia (most common mechanism)
Arrhythmias secondary to hypothermia (AF, VF) or electrolyte disturbance
Myocardial stunning post-resuscitation — temporary cardiogenic shock; echocardiography to assess
Post-resuscitation syndrome — similar to post-cardiac arrest syndrome; target MAP ≥65 mmHg
GCC-Specific Drowning Context
High-Risk Populations in GCC
Group
Context
Nursing Consideration
Children (0–14 years)
Private villa pools; hotel pools; UAE beach resorts
Swimming pool fence legislation; close adult supervision mandatory
Migrant construction workers
Makeshift swimming in desert flash-flood areas; water storage tank accidents
Language barrier; limited access to emergency services; occupational health response
Beach tourists
UAE/Oman beach culture; rip currents; inexperienced swimmers in strong surf
Lifeguard presence at public beaches; UAE Civil Defence water rescue teams
Hajj pilgrims
River crossings (historically); Zamzam well areas; ablution areas
Elderly, chronically ill, often fatigued pilgrims; hypothermia less likely in summer Hajj
UAE Pool Legislation & Child Safety ▼
UAE Federal Law No. 24/2001 on Combating Drowning Accidents — requires safety barriers around swimming pools in villas and residential compounds
Dubai Municipality regulations: all private pools must have fencing ≥1.2m with self-closing, self-latching gates
Hospital nurses involved in child drowning cases must be aware of child protection reporting obligations — Dubai Child Protection Center referral if neglect or inadequate supervision suspected
Free pool safety guides distributed by Dubai Civil Defence at new resident orientation — nurses can reinforce this in community health settings
Migrant Worker Drowning Fatalities ▼
Significant underreporting of drowning deaths among migrant construction workers in GCC — often occur in water storage tanks, on-site facilities, or desert flood waters
Workers from South/Southeast Asia (India, Bangladesh, Nepal) often have limited swimming ability — high-risk group
Occupational health nurses in labour camp settings should ensure water storage tanks are covered and secured; water safety briefings should be part of new worker orientation
In Qatar, the Workers' Support and Insurance Fund covers medical costs for accidental injuries including drowning — nurses should facilitate access to these systems
Resuscitation Considerations in GCC Heat ▼
Drowning in warm water (>25°C) — the protective hypothermia mechanism is absent; poorer outcomes than cold water drowning; rapid neurological damage
UAE/Oman coastal water temperatures: 28–34°C in summer — warm water drowning, no hypothermic protection
Combined heat exhaustion + drowning: patient may be both heat-stressed and water-aspirating simultaneously — address both pathologies
Desert flash floods (wadi flooding): increasingly common after climate-related rainfall events in UAE/Oman; vehicles swept away; cold mountain stream water from higher altitude = some hypothermic protection
Exam MCQs — DHA / DOH / SCFHS / QCHP
Q1. A 6-year-old child is pulled from a swimming pool. She is unresponsive and not breathing. You are at poolside with a bag-valve-mask. What is the CORRECT first action according to drowning resuscitation guidelines?
The correct answer is B. Drowning causes PRIMARY HYPOXIC cardiac arrest — the heart stops due to lack of oxygen, not primary VF/VT. Therefore RESCUE BREATHING takes priority over chest compressions. The drowning resuscitation sequence is: 5 rescue breaths → check pulse → if no pulse, begin CPR. For a child, the ratio is 15:2 (compression:ventilation). Tilting head down to drain water is ineffective and delays oxygenation — it is not recommended. AED should be attached as soon as available but does not replace initial rescue breathing.
Q2. A 35-year-old man is rescued after falling into the sea from a boat. He was submerged for approximately 8 minutes in 14°C water. He is retrieved unconscious but with a weak carotid pulse of 38 bpm. Core temperature is 29°C. Which statement about his resuscitation is CORRECT?
The correct answer is C — wait, let's re-examine. At core temp 29°C with a pulse, the patient is NOT in cardiac arrest yet. The correct management is: active rewarming (warmed IV fluids, warmed humidified O₂, remove wet clothing, warm blankets), monitoring, and airway management. If VF occurs: first 3 defibrillation attempts, then hold further shocks until core temp >30°C. Adrenaline interval is doubled (every 6–10 min instead of 3–5 min) if core temp <30°C to prevent accumulation due to reduced drug metabolism. "No one is dead until warm and dead" applies — never declare death in cold water submersion until rewarmed to ≥32°C. The correct answer is B.
Q3. A 4-year-old child is brought to the emergency department 2 hours after being briefly submerged in a swimming pool. At the time of the event she coughed and spluttered but recovered quickly. Her parents say she "seems fine now." SpO₂ is 97%, she is alert, and chest auscultation is clear. What is the MOST appropriate management?
The correct answer is B — however, the most conservative and safest answer is C. Any child who has experienced submersion, regardless of apparent recovery, is at risk of delayed pulmonary oedema (formerly called "secondary drowning") due to surfactant destruction that may not manifest immediately. Alveolar damage causes a delayed inflammatory and oedema response that can develop 1–24 hours after the event, causing potentially fatal respiratory failure. Minimum 24-hour observation with SpO₂ monitoring is the recommended standard for any symptomatic drowning event in a child. The correct answer for exam purposes is C.
Q4. Which statement CORRECTLY distinguishes the pathophysiology of saltwater versus freshwater drowning?
The correct answer is C. Saltwater is hypertonic — it draws fluid from the hypo-osmotic blood into the alveoli by osmosis, causing rapid pulmonary oedema and haemoconcentration. Freshwater is hypotonic — it is osmotically drawn from the alveoli into the circulation, causing haemodilution, haemolysis (red cell lysis from osmotic stress), and electrolyte disturbances (hyponatraemia, hypokalaemia). However, both mechanisms ultimately result in non-cardiogenic pulmonary oedema from surfactant destruction and alveolar damage, making clinical management essentially the same for both types.