Handheld versus conventional vascular ultrasound for assessing carotid artery plaque.

BACKGROUND: Coronary Artery Disease (CAD) is the leading cause of death worldwide. Ultrasound-detected carotid plaque has been previously shown to predict significant CAD. Despite this evidence, carotid plaque assessment has not been implemented in cardiac risk screening, likely due to the cost associated with a formal carotid ultrasound examination. This study sought to determine whether a handheld vascular ultrasound device could be used as an accurate point-of-care imaging tool for the assessment of carotid artery plaque.

METHODS: We performed a focused vascular ultrasound of the carotid arteries of 200 patients referred for coronary angiography using a handheld ultrasound device as well as a full-size conventional ultrasound system. For each participant, the maximum plaque height (MPH) and total plaque area (TPA) of the carotid artery bulbs were measured.

RESULTS: Carotid plaque assessment using the handheld device was comparable to that of the conventional ultrasound system. We found a good correlation and no relevant bias between handheld and conventional ultrasound systems in measuring MPH (r = 0.84, p < 0.0001) and TPA (r = 0.94, p < 0.0001). Furthermore, there was good inter-rater reliability for online and offline measurements of MPH and offline measurements of TPA by handheld ultrasound (0.79, 0.76 and 0.85, respectively).

CONCLUSIONS: This study demonstrates that a focused ultrasound of the carotid artery using a handheld device can be used to accurately measure MPH and TPA. This protocol has the potential to provide an expedited point-of-care assessment of carotid plaque.