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Brain MRI signal abnormalities and right-to-left shunting in asymptomatic military divers.

机译:无症状军事潜水员的脑部MRI信号异常和从右向左分流。

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INTRODUCTION: We conducted a controlled study to assess the prevalence of brain MRI hyperintense signals and their correlation with right-to-left shunting (RLS) in military divers. METHODS: We prospectively enrolled 32 asymptomatic military divers under 41 yr of age and 32 non-diving healthy subjects matched with respect to age and vascular disease risk factors. We examined both groups with a 3-Tesla brain MRI; RLS was detected using transcranial pulsed Doppler in divers only. RESULTS: Hyperintense spots were observed in 43.7% of the divers and 21.8% of the control subjects. In particular, divers with significant shunting exhibited a higher prevalence of hyperintensities compared to those with slight or no RLS (75% vs. 25%, respectively). Linear trend analysis also revealed a positive correlation between focal white matter changes, determined using a validated visual rating scale and the RLS grade. CONCLUSION: Healthy military divers with a hemodynamically relevant RLS have an increased likelihood of cerebral hyperintense spots compared to age-matched normal subjects. The clinical relevance of these MRI signal abnormalities and their causal relationship with diving remain unclear.
机译:简介:我们进行了一项对照研究,以评估军事潜水员脑部MRI高强度信号的发生率及其与从右向左分流(RLS)的相关性。方法:我们前瞻性招募了32名年龄在41岁以下的无症状军事潜水员和32名年龄和血管疾病危险因素相匹配的非潜水健康受试者。我们使用3-Tesla脑部MRI检查了两组患者。仅在潜水员中使用经颅脉冲多普勒检测到RLS。结果:在潜水者中有43.7%的高强度斑点,在对照组中有21.8%的高斑点。特别是,与没有或没有RLS的潜水员相比,具有明显分流的潜水员表现出较高的高强度发生率(分别为75%和25%)。线性趋势分析还揭示了焦点白质变化之间的正相关性,这是使用经过验证的视觉等级量表和RLS等级确定的。结论:与年龄相匹配的正常人相比,具有血液动力学相关RLS的健康军事潜水员出现脑部高强度斑点的可能性增加。这些MRI信号异常的临床相关性及其与潜水的因果关系仍不清楚。

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