One method of indirect measurement of intracranial pressure is using optic nerve sheath diameter. There is no study whether equal volume of contrast medium injection has any increasing effect of optic nerve sheath diameter. This study is designed to measure the changes of optic nerve sheath diameter and cerebral oxygenation when equal volume of contrast medium or normal saline was injected in epidural space.
Previous study showed that different volume of injections (1.0 ml/kg vs. 1.5 ml/kg) during caudal anesthesia showed siginifiant increase of optic nerve sheath diameter in group of high volumes. Increase of ICP can result in harmful effect including reduced cerebral flow and oxygen saturation. Also, increase of ICP can cause headache, syncope and transient loss of visual acuity. The proven and valid method of measuring ICP indirectly is using optic nerve sheath diameter. This study was designed to examine the changes of optic nerve sheath diameter and cerebral oxygenation when equal volume of contrast medium or normal saline was injected in epidural space.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
DOUBLE
Enrollment
42
thoracic epidural catheterization
Ji Hee Hong
Daegu, South Korea
optic nerve sheath change during 4 time period
optic nerve sheath change during 4 time period using ultrasound
Time frame: Baseline, 10 minutes, 20 minutes, 40 minutes after the completion of the intervention
cerebral oxygenation change during 4 time period
cerebral oxygenation change during 4 time period using cerebral oximeter
Time frame: Baseline, 10 minutes, 20 minutes, 40 minutes after the completion of the intervention
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