Which of the following is a neurological sign of Decompression Sickness Type 2 after surfacing?

• A. Loss of consciousness
• B. Dizziness
• C. Tingling
• D. Coughing

Answer: (C)

Decompression sickness Type 2 affects the nervous system after ascent, because nitrogen bubbles can form in blood and tissues, irritating or compressing nerves. Tingling is a sensory change—a paresthesia—so it directly indicates nervous system involvement, which is the hallmark of Type 2 DCS. Other signs like loss of consciousness can occur but are more extreme or late, dizziness can come from various sources beyond nerve injury, and coughing points to lung involvement rather than the nervous system. So tingling best reflects the neurological impact after surfacing. If this sign is observed, prioritize high-flow oxygen and seek prompt hyperbaric treatment.