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Clinical Applications - Stroke



Stroke is a loss of blood circulation to a certain area of the brain resulting in loss of brain activity corresponding with loss of neurological function. There are two types of stroke, ischemic stroke which is about 85% of stroke cases, it is caused due to a blockage in the blood vessel, and a hemorrhagic stroke which is about 15% of the cases and it is caused due to bleeding within the brain or in the meningeal surrounding areas.


Ischemic stroke is caused mainly by thrombosis or embolism. The main reason for thrombosis or embolism is different diseases like: intra/extra cranial atherosclerosis, vasculitis, Carotid artery dissection, Sickle cell disease, right to left shunts and more.


Digi-Lite TCD is a high sensitivity and specificity diagnostic and follow up system that supports the neurologists' decision about the appropriate treatment. The Digi-Lite helps to diagnose the stroke subtype, thanks to the Digi-Lite multi-gate feature it can locate the exact place of occlusion or the origin of emboli in the major intracranial arteries, it allows fewer uses of angiograms, and it monitors and follows the effect of treatment.

With Digi-Lite and Digi-Lite+IP we can diagnose with more than 90% sensitivity extra cranial lesions in the carotid arteries cause due to carotid artery atherosclerosis, by examining the lesions itself, the proximal and distal branches related to the lesion, and examining the interconnecting branches related to development of collateral flow.

Furthermore, the Digi-Lite TCD is used also for diagnose patients with a risk for stroke in order to give them a prophylactic treatment. Usually these patients diagnosed with an intra/extra cranial stenosis with more than 50%, the TCD examination detect it easily due to stenosis profound effect on flow pattern, and due to the vasomotor reactivity test which can detect an abnormal cerebral endothelial function.

Figure 1: Right MCA stenosis