This scuba diver surfaced with memory loss and became unresponsive. He did not ascend rapidly, and these red marks on his neck became apparent shortly after.
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These neurologic deficits point toward type II decompression sickness, which is believed to be the result of venous obstruction. Venous obstruction is caused by the coalescence of gas bubbles within the low-pressure venous drainage system in the brain. Treatment for decompression syndrome includes hydration, administration of 100% oxygen, and left lateral decubitus placement of the patient.