Evaluation of the Effect of Suspension Laryngoscopy on Optic Nerve Sheath Diameter: An Observational Study

One of the non-invasive procedures used in intracranial pressure monitoring is ultrasonography measurement of optic nerve sheath diameter (ONSD). Laryngoscopy is a procedure that induces hemodynamic alterations as well as increased intracranial pressure. Many procedures have examined intracranial pressure change with ONSD measurement. However, no research has been conducted to investigate the influence of suspension laryngoscopy on ONSD measures. The effect of suspension laryngoscopy on ONSD readings and intracranial pressure was studied in this study.The study included 50 patients, ASA I-III, aged 18-90 years, who were scheduled for suspension laryngoscopy. ONSD measurements were taken after anesthesia induction (T0), intubation (T1), when the neck was in hyperextension at the start of the suspension laryngoscopy (T2), at the end of the suspension laryngoscopy (T3), and 5 minutes after the suspension was terminated and the neck was brought to the straight position (T4). The highest measurements were detected in T2 and T3. laryngoscopy causes a significant increase in ONSD measurements. Suspension time, on the other hand, does not result in a progressive increase. Ending the suspension by straightening the neck at the end of the surgery permits ONSD measurements to approach the baseline values.