Page 192 - Ultrasonography in Prehospital and Emergency Medicine - Rein Ketelaars

190
Chapter 9
Methods
This blinded cross-over study was a single-center prospective research study. Volunteers were recruited at the medical library of the Erasmus University Medical Center. The volunteers were at least 18 years of age and did not have any self-reported medical history of ocular or intracranial disease. Both eyes were intact and functional. Every individual volunteer pro- vided a written informed consent after reading the patient information form which was approved by the Ethical Committee of the Erasmus Medical Center, Rotterdam (MEC-2015- 460).
Rigid collar and optical nerve sheath diameter
ONSD was measured simultaneously in both eyes by two experienced sonographers (IM and RK) who were blinded as to whether a collar was applied to the neck or not. Both sonog- raphers are senior eFAST instructors since 2010 and have been working as helicopter emer-
Figure 9.1 Research set-up