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In acute ischemic stroke patients, selective brain hypothermia is a promising concept aiming at a fast decrease of brain temperature and thus neuroprotection in the acute phase of ischemia. At the same time, the emergence of mechanical thrombectomy (MT) as an effective treatment in large-vessel occlusion opens the door for a combination of neuroprotective approaches in the frame of a neurovascular, catheter-based intervention. In this regard, intracarotid cooling is a very effective energetic approach, using the blood supply to the penumbra as a fast transport vector for heat exchange in affected brain regions. We review the state of development of a novel closed-loop cooling catheter, describing design-related as well as procedural aspects and presenting results from different theoretical and experimental studies. Finally, we compare the concept with two alternative methods: cold saline infusion and extracorporeal blood cooling. We focus on the combination with MT, considering the effect of different and variable perfusion rates on the final goal of a "cold reperfusion" at the time of blood flow restoration.

Review of selective brain hypothermia in acute ischemic stroke therapy using an intracarotid, closed-loop cooling catheter