Wearable Ultrasound Device for Monitoring Blood Flow in Internal Carotid Artery Free

Aneurysmal subarachnoid hemorrhage affects 6.1/100,000 people annually worldwide. After initial bleeding has stopped, victims are at high risk of vasospasm, a narrowing of cerebral arteries that may lead to stroke, for two weeks. One currently used method of monitoring for vasospasm involves calculation of the Lindegaard ratio, a ratio of blood flow velocity in the middle cerebral artery to the ipsilateral internal carotid artery. However, this method requires trained operators, limiting the frequency at which it is performed (no more than once per day). This work demonstrates a proof-of-concept device for frequent Lindegaard ratio calculation via periodic monitoring of blood flow in the internal carotid artery.