Optic Nerve
Conditions
Keywords
ocular ultrasound, optic nerve sheath diameter, ETD
Brief summary
This study is a prospective assessment of the accuracy of ocular ultrasound as a tool to measure the diameter of the optic nerve sheath and the eyeball transverse diameter in healthy adult patients presenting to the Emergency Department and have confirmatory imaging of the optic nerve as part of their clinical care.
Detailed description
This will be a prospective evaluation of accuracy of microconvex and linear transducers for ultrasound measurements of the ONSD and the ETD. Study population will be adult patients that present to Cleveland Clinic Akron General Emergency Department between July 1, 2022 and July 31 April 1, 2023. Patients will be identified on the Emergency Medicine Department tracking board. Patients, once identified as meeting inclusion criteria will be asked to participate in this study and full written consent will be required. All participants will have identical procedures and there will be no groups.
Interventions
PROCEDUREOcular Ultrasound
1\. Patients presenting to the emergency department and have a normal head and/or ocular computed tomography scan will be considered for inclusion in this study. Study staff will discuss the study with the patient and obtain consent. At that point, operator will perform ocular ultrasound. Procedure will start with either the linear or microconvex probe. A single-use sterile gel packet will be used to apply gel to one closed eyelid. The probe will be placed with minimal pressure on the eye. A transverse measurement of the ONSD will be taken. In this same view the maximal transverse diameter of the eyeball will also be measured. Images of the eye with ONSD and ETD measurements will be captured. Repeat until three measurements have been obtained resulting in an average ONSD and ETD for that eye. Repeat for other eye. Switch probe and repeat on both eyes.
Sponsors
Cleveland Clinic Akron General
Study design
Allocation
NA
Intervention model
SINGLE_GROUP
Primary purpose
DIAGNOSTIC
Masking
NONE
Masking description
No masking. All subjects have same intervention.
Intervention model description
There are no groups. All subjects will have the same inclusion criteria and will have the same intervention.
Eligibility
Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
Yes
Inclusion criteria
* 18 years of age and older, and; * Present to Cleveland Clinic Akron General's ED (Main) * Have CT head and/or ocular ordered as a part of clinical care that is read as normal or no acute disease (confirmatory imaging), and; * Agree to and provide written consent for participation.
Exclusion criteria
* Acute ocular pathology * Abnormal brain and/or ocular CT * History of increased intracranial pressure or optic nerve disease * Not medically stable * Pregnant or incarcerated * Unable to consent.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| The Primary objective is to determine the accuracy of the microconvex ultrasound transducer as compared to the linear ultrasound transducer for ultrasound measurement of the optic nerve sheath diameter compared to CT measurements. | through study duration, one year is anticipated. | The patient will be enrolled and be involved with the study for 15-20 minutes. At this time the research procedures will be done. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| To determine the level of intra- and inter-rater variability for ultrasound measurement of the optic nerve sheath diameter between the two transducer types. | through study duration, one year is anticipated. | The patient will be enrolled and be involved with the study for 15-20 minutes. At this time the research procedures will be done. |
| To determine the accuracy of the microconvex ultrasound transducer as compared to the linear ultrasound transducer for ultrasound measurement of the eyeball transverse diameter compared to CT measurements. | through study duration, one year is anticipated. | The patient will be enrolled and be involved with the study for 15-20 minutes. At this time the research procedures will be done. |
| To determine the accuracy of the microconvex ultrasound transducer as compared to the linear ultrasound transducer for ultrasound measurement of the ONSD/ETD compared to CT measurements. | through study duration, one year is anticipated. | The patient will be enrolled and be involved with the study for 15-20 minutes. At this time the research procedures will be done. |
Countries
United States
Contacts
Primary ContactJoshua Jacquet, MD
Backup ContactJessica Krizo, PhD
Outcome results
None listed