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BACKGROUND Magnetic resonanse imaging (MRI) frequently reveals asymptomatic cerebral infarctions in the general population. OBJECTIVE The central nervous system (CNS) of divers is affected by a hyperbaric environment even if they are asymptomatic. METHODS We examined 25 uniformed service divers by MRI and compared them with normal controls. RESULTS Of 25 divers, 9 had CNS lesions vs. 2 of 25 controls (p = 0.02). There was a significant relationship between the CNS lesions, age, and smoking. CONCLUSIONS The divers had a risk of accumulating CNS lesions. These results suggested that divers should undergo periodic medical evaluations and MRI brain scanning.
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