Expression and significance of HA/CD44 in glial cells and optic cross nerves / 国际眼科杂志(Guoji Yanke Zazhi)

@#Hyaluronic acid(HA)is one of the main components of the extracellular matrix(ECM), and it is participated in many cells physiology and pathological processes, such as tissue reconstruction, expansion of cell gap, inflammation and tumorigenesis and so on. CD44 is a cell surface receptor for HA and widely distributed cell surface glycoprotein, which paticipate in specific adhesion of cell to cell and cell to matrix. CD44 is the most important hyaluronic acid receptor on the cell surface. Besides, CD44 is the main site of binding to HA. In this paper, we will elaborate from three aspects: the binding of HA and CD44 and its molecular basis, the expression and significance of HA/CD44 in glial cells(including Müller cells)and the expression and significance of HA/CD44 in the optic nerve, which makes readers have an understanding of the role of HA and CD44.

Neuropatía óptica postraumática, presentación de un caso / Post-traumatic optic neuropathy: case presentation

Introducción: la neuropatía óptica postraumática (NOP) es una entidad en la cual se presenta una lesión del nervio óptico secundaria a un traumatismo directo o indirecto. Puede ser muy fácil de diagnosticar cuando existe la sospecha clínica y se encuentran alteraciones funcionales pupilares. Existen varios estudios que pueden resultar útiles como auxiliares diagnósticos. El objetivo de presentar este caso clínico es el analizar un paciente con diagnóstico de NOP con afección bilateral, con estudio de tractografía positivo para lesión del nervio óptico, con el fin de enfatizar la necesidad de evaluar siempre funcionalmente los ojos en un paciente con traumatismo craneal y conocer la utilidad o no del tratamiento con corticoides en altas dosis. Caso clínico: hombre de 28 años de edad con antecedente de ingesta de licor, es asaltado y sufre traumatismo craneoencefálico con pérdida de la conciencia. A las 16 horas del evento únicamente percibía luz. Se inició tratamiento con corticoides intravenosos ante la sospecha de una neuropatía óptica postraumática. La tractografía de nervios ópticos demostró la presencia de lesión. Conclusiones: el análisis de este caso indica la necesidad de identificar la neuropatía óptica traumática, incluso en ausencia de signos anatómicos. Se debe implementar tempranamente tratamiento a base de corticoesteroides.

Introduction: post traumatic Optic Neuropathy (PON) is an entity in which a lesion of the optic nerve occurs after a direct or indirect trauma. It can be very easy to diagnose when there is clinical suspicion and functional pupillary abnormalities are present. There are several studies available that may be useful as diagnostic aids. The purpose of presenting this case report is to analyze a patient diagnosed with PON with bilateral involvement, with positive tractography study of the optic nerve, in order to emphasize the need to assess functionally the eyes of a patient with head trauma and to establish how useful or not a treatment with high-doses of corticosteroids can be. Clinical case: a 28 year old male with a history of intake of liquor, is assaulted and presented head trauma with loss of consciousness. At 16 hours after the accident there only was light perception. Treatment was initiated with intravenous corticosteroids suspicion of posttraumatic optic neuropathy. Tractography of the optic nerve showed the presence of injury. Conclusions: the analysis of this case indicates the need to identify Postraumatic Optic Neuropathy even in the absence of ocular abnormalities. Early treatment with corticosteroids must be implemented.

The Change of the Optic Nerve Sheath Diameter (ONSD) Following Treatment in Patients with Increased ICP

PURPOSE: Many reports have shown that the optic nerve sheath diameter (ONSD) can be measured easily by ultrasonography, and that it becomes wider when the intra-cranial pressure (ICP) is increased. However, there have been no reports comparing the two ONSDs following proper treatment. We measured the 2nd ONSDs of patients who were diagnosed with intra-cranial hemorrhage and increased ICP and who were admitted to an intensive care unit following management of their conditions, and analyzed the changes of the ONSDs and their relationship to the outcomes. METHODS: During the 10 months beginning December 1, 2004, we recruited 29 patients who were suspected to have increased ICP as indicated by computed tomography at the emergency center. Meeting any one of the following criteria was defined as elevated ICP: mid-line shifting of 3 mm or greater due to mass effect; a collapsed 3rd ventricle; hydrocephalus; effacement of sulci with significant edema; abnormal mesencephalic cisterns. We determined initial ONSDs by ultraonography and the Glasgow Coma Scale (GCS). At the 7th hospital day, GCS and ONSDs were re-evaluated and compared against the previous data. RESULTS: 29 patients (21 male, 8 female, average age 55.55 years) were enrolled. Mean GCS at the admission was 7.86+/-3.60. 18 patients had spontaneous hemorrhage (62%) and 11 patients had traumatic hemorrhage (38%). 22 patients received emergency surgery, 18 patients (62%) showed improved neurological outcomes and 11 (38%) failed to achieve any good outcomes. The initial mean ONSD was 5.41+/-0.70 mm. The average ONSD for traumatic hemorrhage (5.51+/-0.45 mm) was not statistically different from the ONSD for non-traumatic hemorrhage (5.35+/-0.84 mm) (p=0.55). The mean ONSD after 7 days of admission was 4.41+/-0.53 mm, which represented a significant decrease compared with the initial measurements (p<0.05). The mean GCS and ONSD showed significant differences between the improved group and the nonimproved group (GCS: 13.44+/-2.15, 3.82+/-3.82 respectively; and ONSD: 4.13+/-0.40 mm, 4.86+/-0.37 mm respectively; p<0.05). CONCLUSION : Among the patients with increased ICP, the ONSDs who progressed to good neurological outcomes after treatment had a significantly smaller diameter than those of the others. Through measurement of the ONSDs using ultrasonography, we could not only predict increased ICP but also determine the correlation between a patient's ICP and clinical course.

The Change of the Optic Nerve Sheath Diameter (ONSD) Following Treatment in Patients with Increased ICP

PURPOSE: Many reports have shown that the optic nerve sheath diameter (ONSD) can be measured easily by ultrasonography, and that it becomes wider when the intra-cranial pressure (ICP) is increased. However, there have been no reports comparing the two ONSDs following proper treatment. We measured the 2nd ONSDs of patients who were diagnosed with intra-cranial hemorrhage and increased ICP and who were admitted to an intensive care unit following management of their conditions, and analyzed the changes of the ONSDs and their relationship to the outcomes. METHODS: During the 10 months beginning December 1, 2004, we recruited 29 patients who were suspected to have increased ICP as indicated by computed tomography at the emergency center. Meeting any one of the following criteria was defined as elevated ICP: mid-line shifting of 3 mm or greater due to mass effect; a collapsed 3rd ventricle; hydrocephalus; effacement of sulci with significant edema; abnormal mesencephalic cisterns. We determined initial ONSDs by ultraonography and the Glasgow Coma Scale (GCS). At the 7th hospital day, GCS and ONSDs were re-evaluated and compared against the previous data. RESULTS: 29 patients (21 male, 8 female, average age 55.55 years) were enrolled. Mean GCS at the admission was 7.86+/-3.60. 18 patients had spontaneous hemorrhage (62%) and 11 patients had traumatic hemorrhage (38%). 22 patients received emergency surgery, 18 patients (62%) showed improved neurological outcomes and 11 (38%) failed to achieve any good outcomes. The initial mean ONSD was 5.41+/-0.70 mm. The average ONSD for traumatic hemorrhage (5.51+/-0.45 mm) was not statistically different from the ONSD for non-traumatic hemorrhage (5.35+/-0.84 mm) (p=0.55). The mean ONSD after 7 days of admission was 4.41+/-0.53 mm, which represented a significant decrease compared with the initial measurements (p<0.05). The mean GCS and ONSD showed significant differences between the improved group and the nonimproved group (GCS: 13.44+/-2.15, 3.82+/-3.82 respectively; and ONSD: 4.13+/-0.40 mm, 4.86+/-0.37 mm respectively; p<0.05). CONCLUSION : Among the patients with increased ICP, the ONSDs who progressed to good neurological outcomes after treatment had a significantly smaller diameter than those of the others. Through measurement of the ONSDs using ultrasonography, we could not only predict increased ICP but also determine the correlation between a patient's ICP and clinical course.

Therapeutic effect of hyperxia liquid on posttraumatic optic nerve injuries / 中华创伤杂志

Objective To analyze the characteristics of visual evoked potential (VEP) and the role of VEP in detecting posttraumatic optic nerve injury and evaluate the value of hyperxia liquid in treatment of posttraumatic optic nerve injury. Methods A total of 84 patients with optic nerve injury were divided into control group (n=47, received the general treatments) and treatment group (n=37, treated with hyperxia liquid on the basis of the general treatments) that were monitored regularly by VEP at days 1, 7, 14 and 21 respectively after treatment to analyze and compare latency, amplitudes, visual acuity and treatment result. Results After injury, abnormality of VEP occurred at days 1-7, reached the peak at days 7-14, and then markedly relieved at day 21. Compared with control group, degree of VEP abnormality was significantly lower (P