View clinical trials related to Optic Nerve Sheath Diameter.
Filter by:The aim of the study to examine Optic Nerve Sheath Diameter measurement for prediction of fluid responsiveness in hemodynamically unstable patients
Robot-assisted laparoscopic radical prostatectomy (RALRP) is becoming a popular procedure due to its unique advantages. Despite these advantages, pneumoperitoneum and steep trendelenburg position are associated with hemodynamic instability and elevated intracranial pressures (ICP). Ultrasonographic measurement of optic nerve sheath diameter (ONSD) is an indirect but also a generally accepted reliable and noninvasive measurement of elevated ICP. However, optimal cut-off values are highly inconsistent due to multiple factors (gender, height, weight). To eliminate the effects of these factors on the results; a ratio should be established in patients known to have elevated ICPs. In a recent study ONSD/ eyeball transverse diameter(ETD) in healthy volunteers in a specific population was established. 60 patients without any history of ICP undergoing RALRP will be enrolled to the study. Ultrasonographic measurement of ONSD and ETD will be performed 10 minutes after induction of general anesthesia, 10 minutes after CO2 pneumoperitoneum with trendelenburg positioning and measurements will be repeated hourly and at last after returning to supine position without CO2 pneumoperitoneum at the end of the procedure. Hemodynamic variables and BIS values on this specific times will be recorded and an arterial sample will be obtained.
Measurement of the diameter of the sheath of the optic nerve in patients hospitalized in intensive care, with increased intracranial pressure (> 20mmHg) as a substitute measure for diagnosis and follow-up before and after different non-invasive strategies. Three groups were created in which, through strategies already proven and non-invasive (mannitol, hypertonic solution 7.5% NaCl, reverse trendelenburg) to decrease the intracranial pressure, the optic nerve diameter measurement was performed and simultaneously the investigators monitored intracranial pressure through an intraventricular catheter continuously to determine if both correspond
The routine use of cervical collar in emergency medical conditions has recently been questioned. The application of cervical collars, as their opponents point out, results in deterioration of intubation conditions, intensification of pain in the region of mastoid processes, and impaired venous outflow from the head.
It is reported that optic nerve sheath diameter increases when higher volume of medication is injected during epidural anesthesia. This study is designed to compare the optic nerve sheath diameter using 10cc of nomal saline of different speed (3cc/sec vs. 1cc/sec).
In the present study, The investigators evaluated whether anesthetic agents effects on Optic Nerve Sheath Diameter in patients undergoing Robot Assisted Laparoscopic Radical Prostatectomy
Changes of optic nerve sheath diameter after position changes
This study involves observing and comparing Intraocular Pressure and Optic Nerve Sheath Diameter in steep trendelenburg position. Both observations will be done in same patient over the surgical duration.