Cold water immersion, especially in waters below 15ºC, can be perilous. While some individuals acclimatise to cold water over time, for many, the sudden exposure can be life-threatening. Immersion deaths are alarmingly common, especially in cold regions. The body’s reaction to sudden cold water immersion, known as the Cold Shock Response, can lead to uncontrollable breathing, inhalation of water, and potential drowning. Recognising the signs and knowing the immediate first aid steps can be life-saving.
Understanding Cold Water Risks: Diving into cold water, especially when the temperature is below 15ºC, can be hazardous. While some individuals, due to repeated exposure, become accustomed to cold water, for many, it’s a shock that can be fatal. Immersion deaths are notably prevalent, with children and adults alike at risk.
Cold Shock Response: When the body, primarily the skin, is suddenly exposed to cold water, it triggers the Cold Shock Response. This response can cause an involuntary gasp for air, followed by rapid, uncontrollable breathing. This sudden reaction can lead to water inhalation, which, even in small amounts, can overwhelm the lungs and initiate drowning.
Effects on the Cardiovascular System: The immediate cooling of the skin causes blood vessels to constrict, making blood flow challenging. Simultaneously, the heart rate spikes, leading to increased blood pressure. This sudden change forces the heart to work harder, potentially causing cardiovascular issues or even sudden cardiac arrest.
Advice for Cold Water Immersion: If suddenly immersed in cold water:
- Try to remain calm and avoid panicking.
- Focus on floating on your back to keep your face out of the water.
- Once you’ve regained control, seek help or try to get to safety.
First Aid for Cold Water Shock Victims:
- Once out of the water, the individual might shiver intensely and struggle with motor functions.
- Move them to a sheltered area, away from the wind.
- Replace wet clothes with dry ones.
- Offer warm fluids and food to help their body generate heat.
- Monitor them closely and seek medical assistance if they don’t show signs of improvement.
Understanding Drowning: Drowning occurs when the lungs fill with water, depriving the heart and brain of oxygen. It’s essential to note that drowning victims might not exhibit the typical signs shown in movies. They might be quiet, struggling to move, and unable to call for help. If someone is spotted in such a state:
- Remove them from the water and lay them on their back.
- Administer five rescue breaths.
- Perform CPR, alternating between 30 chest compression’s and 2 rescue breaths.
- Call emergency services immediately.
Secondary Drowning: This term refers to complications that can arise up to 48 hours after a near-drowning incident. Even if a small amount of water enters the lungs, it can lead to serious issues. Symptoms to watch for include difficulty breathing, extreme fatigue, behavioural changes, persistent coughing, chest pains, and vomiting. If any of these symptoms appear, seek medical attention immediately.
