Intracranial endovascular balloon test occlusion: indications, methods, and predictive value

Area of Science:

• Neurology
• Vascular Surgery
• Diagnostic Imaging

Background:

• Abrupt internal carotid artery occlusion without prior assessment carries a significant 26% risk of cerebral infarction.
• Evaluating collateral circulation efficacy is vital for patient safety during carotid artery procedures.
• Balloon test occlusion (BTO) is a key diagnostic tool for assessing tolerance to parent vessel occlusion.

Purpose of the Study:

• To review the indications for performing balloon test occlusion (BTO).
• To detail the various methods employed during BTO.
• To discuss the predictive value and potential complications associated with BTO.

Main Methods:

• Review of existing literature on balloon test occlusion (BTO).
• Analysis of clinical examination findings, angiographic assessment, and stump pressure measurements.
• Evaluation of advanced monitoring techniques including perfusion scanning, transcranial Doppler ultrasonography, and neurophysiologic monitoring.

Main Results:

• BTO helps evaluate the efficacy of collateral circulation, thereby decreasing the risk of cerebral infarction.
• Clinical tolerance to parent vessel occlusion can be assessed using multiple BTO variables.
• The review synthesizes information on BTO's predictive value and associated complications.

Conclusions:

• Balloon test occlusion (BTO) is an essential pre-procedural assessment for internal carotid artery interruption.
• Comprehensive evaluation using BTO variables improves patient safety and reduces neurological deficits.
• Understanding BTO's indications, methods, and risks is critical for neurovascular specialists.