An observational study in Optic Nerve Cup and Intracranial Pressure Increase, sponsored by Başakşehir Çam & Sakura City Hospital. Recruiting at 1 site in Turkey. Open to participants aged 18 Years to 65 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2024-08-05.
Sponsored by Başakşehir Çam & Sakura City Hospital · Observational
In this study, the effect of increased venous return and increased intra-abdominal pressure on intracranial pressure in the lithotomy position was evaluated.
In the lithotomy position, it is possible that venous return in the lower extremities increases and intra-abdominal pressure increases due to the position. At the same time, it is possible that the intracompartmental pressure in the extremities increases because the venous structure is compressed by placing the lower extremities on supports. Considering both conditions, it is predicted that there may be an increase in the optic nerve sheath diameter due to increased intracranial pressure in patients placed in the lithotomy position. The aim of this study is to investigate the effect of the position on intracranial pressure by ultrasonographically evaluating the optic nerve sheath diameter in the lithotomy position.
185 studies on the registry are indexed under Intracranial Hypertension; 45 are open to participants now.
This study's planned enrollment of 52 is below the median of 60 across 80 observational studies indexed under Intracranial Hypertension.
Browse Intracranial Hypertension studies →Başakşehir Çam & Sakura City Hospital is the lead sponsor of 105 studies on the registry; 36 are open to participants now.
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A total of 52 patients, ASA I-II, aged between 18-65, who are scheduled for elective RIRS surgery under general anesthesia will be included.
Exclusion Criteria:
Patients who will undergo RIRS surgery in the lithotomy position
Device: ultrasound
Measurement of optic nerve sheath diameter by ultrasound
Effect of lithotomy position on optic nerve sheath diameter
In patients in the lithotomy position, the linear probe of the ultrasound will be placed on the patient's upper eyelid in a transverse and longitudinal manner without applying compression, and the optic nerve's entry into the orbit will be visualized and measured. The increase in the optic nerve sheath diameter will be recorded by measuring at 7 different times in total.Before general anesthesia (t1), 3 minutes (min.) (t2) and 5 min. (t3) after general anesthesia, 3 min. (t4) and 5 min. (t5) after lithotomy position was given, before lithotomy position was corrected (t6) and when 10 minutes after patients go to the recovery room (t7).
Time frame: intraoperative and postoperative 10 minutes
Plan to share: Undecided — Not decided yet
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Başakşehir Çam & Sakura City Hospital