Lit Matters #3: The BASICS Trial - Endovascular Therapy for Basilar Artery Occlusion

Basilar artery occlusion is a devastating posterior-circulation stroke where reperfusion may restore flow without guaranteeing good neurologic recovery. In BASICS, endovascular therapy did not significantly outperform medical management, but the trial leaves real uncertainty about patient selection, imaging, and whether a clinically meaningful benefit was missed.

Basilar Artery Occlusion Thrombectomy

• Neutral primary outcome: BASICS found no statistically significant improvement in favorable functional outcome with endovascular therapy versus standard care, despite a directional signal toward benefit.
• Recanalization-outcome disconnect: Basilar artery patency at 24 hours was much higher with endovascular therapy, yet that flow advantage did not translate into clearly better neurologic outcomes.
• Imaging selection gap: CT perfusion was not used to select patients, a major limitation when salvageable tissue likely determines who benefits from posterior-circulation thrombectomy. We get into why that mismatch matters in the episode.
• Evolving stroke era: Enrollment stretched from 2011 to 2019, spanning major changes in stroke systems and thrombectomy practice that may have diluted a treatment effect.
• Underpowered signal: The observed differences in death and good functional outcome were modest enough that a far larger trial would be needed to prove or refute a real benefit.