Ultrasound-enhanced systemic thrombolysis for acute ischemic stroke

Area of Science:

• Neuroscience
• Medical Imaging
• Cardiovascular Medicine

Background:

• Acute ischemic stroke poses significant risks due to intracranial blood flow obstruction.
• Transcranial Doppler (TCD) ultrasonography is explored as an adjunct to thrombolytic therapy.
• Tissue plasminogen activator (t-PA) is a standard treatment for ischemic stroke.

Purpose of the Study:

• To investigate if TCD ultrasonography can safely enhance the thrombolytic efficacy of t-PA.
• To determine the impact of continuous TCD on recanalization and clinical outcomes in acute ischemic stroke.

Main Methods:

• Patients with middle cerebral artery occlusion received intravenous t-PA within 3 hours of symptom onset.
• Participants were randomized to receive continuous 2-MHz TCD (target group) or placebo (control group).
• Primary endpoint: complete recanalization or dramatic clinical recovery; Secondary endpoints: 24-hour recovery, 3-month favorable outcome, and 3-month mortality.

Main Results:

• 49% of patients in the TCD group achieved complete recanalization or dramatic recovery within 2 hours, versus 30% in the control group (P=0.03).
• No significant difference in dramatic clinical recovery at 24 hours (44% vs 40%) or favorable outcomes at 3 months (42% vs 29%).
• Symptomatic intracerebral hemorrhage rates were similar between groups (3 patients each).

Conclusions:

• Continuous TCD ultrasonography augments t-PA-induced arterial recanalization in acute ischemic stroke.
• A nonsignificant trend towards improved stroke recovery was observed with TCD.
• TCD appears to be a safe adjunctive tool for enhancing thrombolysis in acute ischemic stroke.