Hippus Diagnosis and Management

Clinical Evaluation and Risk Stratification

The American Academy of Neurology recommends immediate neuroimaging (MRI with gadolinium and MRA or CTA) in patients with hippus and high-risk features such as pupillary asymmetry with ptosis or extraocular movement deficits, which suggests third nerve palsy from posterior communicating artery aneurysm or mass lesion 1, 2
The American Heart Association suggests that patients with hippus and altered mental status, progressive deterioration in consciousness, or unilateral pupillary dilation progressing to bilateral involvement are at high risk of mortality and require urgent evaluation 1, 3, 4
The American College of Emergency Physicians recommends assessing level of consciousness using the Glasgow Coma Scale, with a score ≤12 or decline ≥2 points indicating deterioration, in patients with hippus 3
The American Academy of Ophthalmology suggests performing a pupillary examination in bright and dim light to assess size, symmetry, and reactivity in patients with hippus 1

The American College of Radiology recommends immediate neuroimaging (MRI with gadolinium and MRA or CTA) to evaluate for posterior communicating artery aneurysm, intracranial hemorrhage, mass lesions, cerebellar infarction, and brainstem pathology in high-risk patients with hippus 1, 2, 3, 4
The American Heart Association suggests that if aneurysm is suspected but MRA/CTA is negative, catheter angiography should be considered 2

The American College of Surgeons recommends elevating the head of the bed to 30 degrees to improve venous drainage, ensuring good head/body alignment to prevent increased intrathoracic pressure, administering osmotic therapy (mannitol or hypertonic saline) for clinical deterioration from cerebral swelling, maintaining adequate oxygenation, and consulting neurosurgery immediately for suspected aneurysm or mass lesion requiring intervention in patients with hippus and signs of increased ICP or herniation 3, 4
The American Academy of Neurology suggests urgent vascular imaging for aneurysm and neurosurgical intervention if aneurysm is identified in patients with third nerve palsy and pupil involvement 1, 2

The American College of Physicians recommends follow-up based on identified etiology and specialist recommendations for patients with hippus 1