View clinical trials related to Optic Nerve Sheath Diameter.
Filter by:Laparoscopic gastric sleeve gastrectomy is becoming an increasingly frequent procedure for patients with severe obesity and its related diseases, such as type 2 diabetes, hypertension, dyslipidemia, and sleep apnea. Assessing the optic nerve sheath diameter (ONSD) with noninvasive ultrasonography has shown to be accurate in determining increased ICP as pressure changes in the subarachnoid space and the cerebrospinal fluid reflect variations in the optic nerve sheath (ONS). The investigators hypothesized that if ICP during laparoscopy is different according to the position, ONSD would likewise be different. Thus, investigators will investigate the change of ONSD according to the positional change in laparoscopic sleeve gastrectomy surgery.
This study aims to compare the change of optic nerve sheath diameter in obese and non-obese patients undergoing laparoscopic gynecological surgery in a steep Trendelenburg position.
Long standing prone position could affect vision or optic nerve. To measure the optic nerve sheath diameter using ultrasound is quick and useful assessments of patients. This study will look at the change of optic nerve sheath diameters of patients undergoing surgery in prone position
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.