[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"health-studies-list:{\"conditionNormalized\":\"intracranial-pressure-change\",\"overallStatus\":[\"RECRUITING\",\"AVAILABLE\",\"NOT_YET_RECRUITING\"],\"orderBy\":\"LastUpdateSubmitDate:desc\",\"size\":25,\"offset\":0}":3,"health-study-condition:intracranial-pressure-change":28},{"pageToken":4,"total":5,"offset":6,"count":5,"results":7},null,1,0,[8],{"id":9,"slug":10,"hasResults":11,"nctId":12,"briefTitle":13,"officialTitle":14,"acronym":4,"eligibilityCriteria":15,"healthyVolunteers":11,"sex":16,"minAge":17,"maxAge":18,"enrollmentInfo":19,"targetDuration":4,"studyType":22,"phases":23,"briefSummary":25,"conditions":26,"keywords":4,"overallStatus":32,"whyStopped":4,"lastUpdateSubmitDate":33,"lastUpdatePostDateStruct":34,"startDateStruct":37,"completionDateStruct":39,"leadSponsor":41,"locationsCount":5},"100554326","effect-of-spinal-needle-type-on-optic-nerve-sheath-diameter-100554326",false,"NCT06497634","Effect of Spinal Needle Type on Optic Nerve Sheath Diameter","Effect of Needle Types and Diameters Using in Spinal Anesthesia on Optic Nerve Sheath Diameter; Prospective Randomized Study","Inclusion Criteria:\n\n* American Society of Anesthesiologists (ASA) I-II Risk Classification\n* Elective orthopedic lower extremity surgery\n* Using a tourniquet\n* Spinal anesthesia\n\nExclusion Criteria:\n\n* Bilateral tourniquet usage\n* History of orbital trauma\n* Optic nerve pathology\n* Glaucoma\n* Asthma\n* Coronary obstructive or pulmonary disease\n* Previous corneal or intraocular surgery\n* Increased intracranial pressure\n* Coagulopathy\n* Local site infection\n* Refusing to participate in the study","ALL","18 Years","40 Years",{"count":20,"type":21},165,"ESTIMATED","INTERVENTIONAL",[24],"NA","The optic nerve sheath is a continuation of the dura mater, extending along the subarachnoid space surrounding the optic nerve. Consequently, changes in intracranial pressure cause an augmentation or contraction in the diameter of the optic nerve sheath, which is coreleted with intracranial pressure. Participants undergoing lower extremity operations (ankle, distal tibia and fibula surgeries) using a tourniquet under spinal anesthesia will be investigated. Spinal anesthesia will be performed with a 25 G Whitacre, 25 G Quincke, or 27 G Quincke needle, depending on the study group. Optic nerve sheath diameter (ONSD) measurements will be performed before spinal anesthesia; and 5 minutes, 15 minutes,,24 hours after spinal block, respectively.The 4th measurement will be performed after tourniquet is opened. Measurements will be done with 15 MHz linear ultrasound (US) probe in B mode, 3 mm behind the posterior globe in the transverse plane from both eyes, on upper eyelid. Values will be recorded numerically. The impact of spinal anesthesia administered using various needle designs (Quincke and Whitacre) and sizes (25G-27G) on intracranial pressure will be investigated.",[27,28,29,30,31],"Spinal Anesthesia","Intracranial Pressure Change","Optic Nerve Sheath Diameter","Orthopedic Surgery","Cerebrospinal Fluid Leak","NOT_YET_RECRUITING","2024-07-29",{"date":35,"type":36},"2024-07-30","ACTUAL",{"date":38,"type":21},"2024-08-15",{"date":40,"type":21},"2024-12-30",{"name":42,"class":43},"Bagcilar Training and Research Hospital","OTHER_GOV"]