Mehrpour Masoud, Shams-Hosseini Narges Sadat, Rezaali Saeed
1. MD, MPH, Associate Professor (Neurologist), Department of Neurology, Iran University of Medical Sciences, Tehran, Iran.
2. MD, Occupational medicine resident, Department of Occupational and Environmental Medicine, Center Research of Occupational Disease, Firoozgar Clinical Research Developmental Center, Tehran University of Medical Sciences, Tehran, Iran.
Med J Islam Repub Iran. 2014 Sep 7;28:89. eCollection 2014.
There is not any data available about the effect of high bar pressure condition on intracranial pressure. In this study, the effect of diving on the optic nerve and sheath diameters as non-invasive markers of intracranial pressure has been investigated.
Twenty professional male divers from twenty one volunteers were chosen for this cross-sectional study. Only one person who had a history of barotraumas was excluded. Each diver then completed a questionnaire on demographic data, medical and diving history. Nineteen other volunteers were selected to represent a control group. A 10-MHz linear ultrasonic probe was used to measure the optic nerve sheath diameters of both eyes in closed and supine position and its relationship with diving history of divers was determined.
It was found that divers have a higher mean optic nerve sheath diameter compared to the normal population as previously reported by other studies. The mean diameter of the left and right optic nerve sheaths were 6.4±0.7, 6.5±0.9 mm respectively and a significant relationship between optic nerve sheath diameter and diving history was found.
RESULTS showed that divers have a higher optic nerve diameter than the general population. However, our result cannot yet be considered as a marker of intracranial pressure in divers as it was conducted on an limited number of subjects and so a bigger study should be undertaken for this purpose.
目前尚无关于高压环境对颅内压影响的可用数据。在本研究中，已对潜水对视神经和视神经鞘直径（作为颅内压的非侵入性标志物）的影响进行了调查。
从21名志愿者中挑选出20名职业男性潜水员进行这项横断面研究。仅排除一名有气压伤病史的人。然后，每位潜水员完成一份关于人口统计学数据、医疗和潜水史的问卷。另外选择19名志愿者作为对照组。使用10兆赫线性超声探头在闭眼仰卧位测量双眼的视神经鞘直径，并确定其与潜水员潜水史的关系。
正如其他研究先前报道的那样，发现潜水员的平均视神经鞘直径高于正常人群。左右视神经鞘的平均直径分别为6.4±0.7、6.5±0.9毫米，并且发现视神经鞘直径与潜水史之间存在显著关系。
结果表明，潜水员的视神经直径比一般人群大。然而，由于本研究的受试者数量有限，我们的结果尚不能被视为潜水员颅内压的标志物，因此应为此开展更大规模的研究。
