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Depending on the physiology of pregnancy, the risk of increased aspiration, difficult airway, increased oxygen consumption and reduced functional residual capacity, breathing problems make general anesthesia application risky. In obstetric operations, neuraxial anesthesia is preferred because of both maternal and maternal mortality and morbidity. Epidural area has decreased due to pregnancy physiology. Previous studies have shown that the blood given to the epidural area increases the intracranial pressure by compressing the dura mater.Optic nerve diameter measurements ultrasound guided is a non-invasive and reliable method for detecting intracranial pressure increase.
In this study, aimed to compare the optic nerve sheath diameter before and after epidural anesthesia with USG.
Epidural anesthesia will be performed at L2 level and sitting position in all patients. Patients will be measured and recorded for optic nerve sheath diameter at 15 min (T2), 30 min (T3) and 60 min (T4) immediately after epidural anesthesia (T0) and after epidural anesthesia.. Measurement of the optic nerve sheath diameter will be done with the help of a linear probe without applying high pressure to the eyeball while the patient is in supine position and the eyelids are closed. The optic nerve sheath diameter will be measured 3 mm beyond the optical disc. The measurements shall be applied in both transverse and sagittal planes for both eyes and the arithmetic mean of the four measured values.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| preepidural ONSD | Active Comparator | The diameter of the optic nerve sheath to be measured(ONSD) with the help of ultrasonography before epidural anesthesia(pre epidural ONSD). The measurement will be measured 3 mm behind the optical disc. The measurements shall be applied in both transverse and sagittal planes for both eyes and the arithmetic mean of the four measured values. |
|
| post epidural ONSD | Experimental | The diameter of the optic nerve sheath to be measured with the help of ultrasonography Immediately after epidural anesthesia(post epidural ONSD) (T1), 15 minutes (T2), 30 min (T3), 60. min (T4) epidural anesthesia. The measurement will be measured 3 mm behind the optical disc. The measurements shall be applied in both transverse and sagittal planes for both eyes and the arithmetic mean of the four measured values. |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| USG guided ONSD measurement preepidural | Procedure | Measurement of the diameter of the optic nerve sheath preepidural and postepidural anesthesia |
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| Measure | Description | Time Frame |
|---|---|---|
| increase in the diameter of the optic nerve sheath after epidural anesthesia | increase of intracranial pressure as a result of the administration of 20 ml of local anesthetic to the epidural area and its reflection on the diameter of the optic nerve sheath | Basal(T0),Immediately after administration of epidural anesthesia(T1), after epidural anesthesia 15 min(T2), 30 min (T3),60 min (T4) |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Role | Phone | Extension | |
|---|---|---|---|---|
| murat bilgi, MD | Contact | +90 05053745059 | drmuratbilgi@gmail.com | |
| murat bilgi, MD | Contact |
| Name | Affiliation | Role |
|---|---|---|
| murat bilgi, MD | Abant Izzet Baysal University | Principal Investigator |
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