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Hopkins Stroke Detector Uses Video-Oculography for Faster Diagnosis (w/video)

March 7th, 2013 Medgadget Editors Neurology, News

Hopkins-stroke-detecting-glassesAs everyone knows by now, when someone experiences a stroke “time lost is brain lost.” But before treatment can begin, it is critical to confirm that the patient isn’t experiencing stroke-like symptoms from another, less life threatening condition. CT scans are usually performed as soon as possible to diagnose a stroke, but they’re not definitive, while MRI suffers from high cost and the fact that many clinics simply don’t have one available for emergency use. A team from Johns Hopkins Medicine has developed a considerably cheaper solution that so far has performed just as well as MRI exams in identifying stroke in a small pilot study.

stroke glassesStrokes have unique symptoms, some of which can be spotted in eye movements of those afflicted. Yet, visual tests have been very subjective, requiring a physician to detect slight irregularities in the ocular movement. The new system from Hopkins uses special glasses to track the eyeballs while a clinician performs head impulse testing (rotating the patient’s head while he looks at a stationary object). It is to be used specifically in patients presenting with dizziness/vertigo to differentiate between stroke and benign causes of the same symptoms. The researchers dub the technique as “ECG for the eyes,” being a fast and relatively easy parallel to how cardiac events are currently detected.

From the study abstract in Stroke:

Methods—Proof-of-concept study (August 2011 to June 2012). We recruited adult emergency department patients with acute vestibular syndrome defined as new, persistent vertigo/dizziness, nystagmus, and (1) nausea/vomiting, (2) head motion intolerance, or (3) new gait unsteadiness. We recorded eye movements, including quantitative horizontal head impulse testing of vestibulo-ocular-reflex function. Two masked vestibular experts rated vestibular findings, which were compared with final radiographic gold-standard diagnoses. Masked neuroimaging raters determined stroke or no stroke using magnetic resonance imaging of the brain with diffusion-weighted imaging obtained 48 hours to 7 days after symptom onset.

Results—We enrolled 12 consecutive patients who underwent confirmatory magnetic resonance imaging. Mean age was 61 years (range 30–73), and 10 were men. Expert-rated video-oculography–based head impulse test, nystagmus, test-ofskew examination was 100% accurate (6 strokes, 6 peripheral vestibular).

 

Study abstract in journal Stroke: Quantitative Video-Oculography to Help Diagnose Stroke in Acute Vertigo and Dizziness

Press release: IS IT A STROKE OR BENIGN DIZZINESS? A SIMPLE BEDSIDE TEST CAN TELL

Medgadget Editors

Medical technologies transform the world! Join us and see the progress in real time. At Medgadget, we report the latest technology news, interview leaders in the field, and file dispatches from medical events around the world since 2004.

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