The caloric irrigation test, also known as the oculovestibular reflex test, is used to assess brainstem function in patients, especially those who are comatose. In this test, cold water is introduced into the ear canal, which should induce a predictable response if the brainstem is intact. The normal response to cold water irrigation is nystagmus with slow deviation of the eyes toward the side of the cold water (in this case, the left) and a fast phase of eye movement (nystagmus) away from the side of the cold water (to the right). This indicates that the brainstem pathways are functioning properly. References: =

American Association of Critical-Care Nurses (AACN). (2024). CCRN Exam Handbook. Retrieved from AACN CCRN Exam Handbook

Adult CCRN/CCRN-E/CCRN-K Certification Review Course Online. AACN