Decompression Illness: Awareness and Response
Decompression illness (DCI) is a serious, yet rare, risk in recreational diving. Understanding its causes, symptoms, and proper response is crucial for every diver's safety.
Important Safety Notice
This article provides general information and is not a substitute for professional medical advice, comprehensive dive training, or specific instructions from equipment manufacturers. Always follow the guidelines of your certified dive training agency, consult with a qualified medical professional, and adhere strictly to your dive computer or dive table instructions. Siebe Gorman encourages all divers to prioritize safety through education and responsible diving practices.
Understanding Decompression Illness (DCI)
Decompression illness, often referred to as DCI, encompasses both decompression sickness (DCS) and arterial gas embolism (AGE). It occurs when inert gases, primarily nitrogen, absorbed by the body during a dive form bubbles upon ascent that cannot be safely eliminated. These bubbles can manifest in various ways, affecting different body systems.
The risk of DCI is influenced by several factors, including dive depth and duration, ascent rate, repetitive dives, and individual physiological differences. While modern dive computers and tables significantly mitigate this risk by providing no-decompression limits and safety stop recommendations, DCI can still occur even when following guidelines, highlighting the importance of awareness.
Recognizing the Signs and Symptoms
DCI symptoms can be subtle and varied, making early recognition challenging but vital. They may appear immediately after a dive or be delayed by several hours. Common symptoms include joint pain ('the bends'), unusual fatigue, skin rash or mottling, numbness or tingling, and muscle weakness. More severe cases can involve dizziness, vision disturbances, difficulty breathing, paralysis, or unconsciousness.
It's important not to dismiss any unusual post-dive symptoms, especially after challenging or repetitive dives. Remember that not all symptoms are immediately debilitating, and even mild discomfort should be taken seriously. Your dive training agency materials provide comprehensive lists of symptoms to be aware of.
Immediate Response and Management
If DCI is suspected, immediate action is critical. The primary treatment for DCI is recompression in a hyperbaric chamber, which requires specialized medical facilities. Your first priority upon suspecting DCI is to provide first aid and arrange for prompt medical evaluation and transport.
Administer 100% oxygen if trained and available, maintain the diver's comfort and warmth, and contact local emergency services or a dedicated diving medical hotline (e.g., DAN, Divers Alert Network) immediately. Do not attempt in-water recompression. Provide all available dive profile information to medical personnel. Emphasize that seeking professional medical evaluation without delay is paramount, even for seemingly minor symptoms.
Dive-day checklist
Post-Dive DCI Awareness Checklist
- Monitor yourself and your dive buddy for any unusual symptoms.
- Do not dismiss even mild post-dive discomfort; take all symptoms seriously.
- Stay hydrated and avoid strenuous activity immediately after diving.
- If DCI is suspected, administer 100% oxygen (if trained) and seek immediate medical attention.
- Contact emergency services or a dive medical hotline and provide all dive details.
General guidance only. Follow your training, the dive operator’s procedures, and each manufacturer’s current instructions.
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General educational guidance only. It is not medical advice, emergency instruction or a replacement for training, certification, manufacturer instructions, your operator's briefing or your dive plan.