Increased blood flow velocity in the bilateral middle cerebral arteries as a result of Doppler ultrasound is mainly seen in vascular stenosis and vasospasm.
1. Vascular stenosis: The middle cerebral artery can be narrowed due to atheromatous plaque formation, fibromuscular dysplasia, external compression, tortuous arteries, inflammatory vasculopathies, vascular entrapment, radial vasculitis, and amyloidosis, which can increase the speed of blood flow through the middle cerebral artery.
2. Vasospasm: Vasospasm can occur due to excessive mental tension, pain stimulation, etc. It can also occur during Doppler ultrasound examination.
When there is an increase in the blood flow rate of the middle cerebral artery bilaterally, timely diagnosis and treatment should be made to avoid delaying the condition.