Noninvasive cerebrovascular evaluation: a prerequisite for angiography?

Area of Science:

• Neurology
• Vascular Medicine
• Diagnostic Imaging

Background:

• Cerebrovascular evaluation is crucial for stroke prevention.
• The safety and cost-effectiveness of diagnostic angiography require scrutiny.
• The efficacy of noninvasive screening methods in guiding angiography is debated.

Purpose of the Study:

• To assess the safety and economic efficiency of angiography in unselected patients.
• To determine if noninvasive screening is sensitive and effective in increasing the diagnostic yield of angiography.
• To evaluate outcomes for patients with positive noninvasive screening results who did not undergo angiography.

Main Methods:

• Retrospective reassessment of cerebrovascular evaluation results in 768 patients.
• Comparison of outcomes between patients undergoing angiography with and without prior noninvasive screening.
• Analysis of complication rates (hemorrhage, neurologic deficit, death) associated with angiography.
• Evaluation of cerebrovascular events in patients with positive noninvasive screening who did not receive angiography.

Main Results:

• Angiography in unselected patients yielded positive results in 21% and carried risks of hemorrhage (2.4%), neurologic deficit (2.2%), and death (0.2%).
• Noninvasive screening identified 64% of patients who did not require angiography, while increasing the yield of positive angiographic findings from 21% to 74%.
• Patients with positive noninvasive screening who forewent angiography faced a 3% mortality and 21% stroke rate over 3 years.

Conclusions:

• Cervicocephalic angiography in asymptomatic, unselected patients is no longer justifiable due to safety and efficiency concerns.
• Positive noninvasive screening results must be acted upon, as delaying treatment leads to significant mortality and morbidity.
• Noninvasive screening enhances the diagnostic utility of angiography and improves patient selection, reducing unnecessary invasive procedures.