Effect of Spinal Needle Type on Optic Nerve Sheath Diameter

Launched by BAGCILAR TRAINING AND RESEARCH HOSPITAL · Jul 4, 2024

Keywords

ClinConnect Summary

This clinical trial is looking at how different types of spinal needles used during anesthesia for lower leg surgeries affect the optic nerve sheath diameter, which can give us clues about changes in pressure inside the skull. Participants will be undergoing surgeries like ankle or lower leg procedures while receiving spinal anesthesia. Depending on the group they are in, they will receive spinal anesthesia using either a 25 G Whitacre needle, a 25 G Quincke needle, or a 27 G Quincke needle. The study will measure the diameter of the optic nerve sheath at various times before and after the anesthesia is given, using a special ultrasound technique.

To participate in this trial, individuals should be between 65 and 74 years old and classified as low-risk for anesthesia. They must be scheduled for elective orthopedic surgery on their lower legs and will need to have a tourniquet used during the procedure. However, those with certain medical conditions, such as glaucoma, asthma, or those who have had previous eye surgeries, among others, will not be eligible. This study aims to better understand how the type and size of spinal needles can influence intracranial pressure and help improve patient care during surgeries.

Gender

ALL

Eligibility criteria

• Inclusion Criteria:
• • American Society of Anesthesiologists (ASA) I-II Risk Classification
• • Elective orthopedic lower extremity surgery
• • Using a tourniquet
• • Spinal anesthesia
• Exclusion Criteria:
• • Bilateral tourniquet usage
• • History of orbital trauma
• • Optic nerve pathology
• • Glaucoma
• • Asthma
• • Coronary obstructive or pulmonary disease
• • Previous corneal or intraocular surgery
• • Increased intracranial pressure
• • Coagulopathy
• • Local site infection
• • Refusing to participate in the study