Collateral flow predicts response to endovascular therapy for acute ischemic stroke

Area of Science:

• Neurology
• Interventional Radiology
• Cerebrovascular Disease

Background:

• Collateral circulation is vital for sustaining brain tissue before recanalization.
• The impact of baseline collateral flow on recanalization after endovascular therapy is not well understood.

Purpose of the Study:

• To investigate the relationship between pretreatment collateral grade and vascular recanalization rates.
• To assess the influence of collateral status on infarct growth after endovascular treatment for acute cerebral ischemia.

Main Methods:

• Analysis of 222 patients undergoing endovascular therapy for acute ischemic stroke from two distinct populations.
• Assessment of pretreatment collateral grade using the Thrombolysis In Myocardial Ischemia (TIMI) scale.
• Evaluation of infarct growth via serial MRI.

Main Results:

• Higher pretreatment collateral grades were significantly associated with increased rates of complete vascular recanalization (P<0.001).
• This association remained independent of other factors, including therapy mode and occlusion site.
• Patients with poor collaterals experienced greater infarct growth when revascularization was achieved (P=0.012).

Conclusions:

• Angiographic collateral grade is a key determinant of recanalization success after endovascular therapy.
• Poor collateral status may negate the benefits of successful revascularization.
• Collateral assessment can aid in guiding treatment decisions for acute cerebral ischemia.