Prognosis
Immediate treatment with 100% oxygen, followed by recompression in a hyperbaric chamber, will in most cases result in no long term effects. However, permanent long-term injury from DCS is possible. Three-month follow-ups on diving accidents reported to DAN in 1987 showed 14.3% of the 268 divers surveyed "still had residual signs and symptoms from Type II DCS and 7% from Type I DCS". Long-term follow-ups showed similar results, with 16% having permanent neurological sequelae.
Read more about this topic: Decompression Sickness