Effect of Lithotomy Position on Optic Nerve Sheath Diameter

Recruiting

• Conditions: Optic Nerve Cup; Intracranial Pressure Increase

• Registration Number: NCT06464419
• Lead Sponsor: Başakşehir Çam & Sakura City Hospital

Brief Summary

In this study, the effect of increased venous return and increased intra-abdominal pressure on intracranial pressure in the lithotomy position was evaluated.

Detailed Description

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.

Study Timeline

• Status Verified: 2024-06
• Study Start: 2024-06-10
• Study First Submitted: 2024-06-13
• Study First Submitted QC: 2024-06-13
• Study First Posted: 2024-06-18
• Last Update Submitted: 2024-08-02
• Last Update Posted: 2024-08-05
• Primary Completion: 2024-08-10
• Study Completion: 2024-09-01

Recruitment & Eligibility

• Status: RECRUITING
• Sex: All
• Target Recruitment: 52

Inclusion Criteria

• Patients who give informed consent
• Patients who will undergo retrograde intrarenal surgery
• Patients who are fully oriented and cooperative
• ASA I-II patients
• Patients between the ages of 18-65

Exclusion Criteria

• Disoriented and uncooperative patients
• Patients with BMI>30
• Patients who have had previous intracranial surgery
• Patients who have had eye surgery before
• Patients allergic to the pharmacological agents used in the study

Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Primary Outcome Measures

Name	Time	Method
Effect of lithotomy position on optic nerve sheath diameter	intraoperative and postoperative 10 minutes	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).

Trial Locations

Locations (1)

EtlikCityHospital; 🇹🇷 Ankara, Turkey