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In page Arctic Sun medical device:

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Historically, clinicians reported that catheters cool at a quicker rate,[citation needed] however, a 2011 study published in the Society of Critical Care Medicine where 167 patients treated either with the Arctic Sun or the Alsius Coolgard Catheter demonstrated time from cardiac arrest to achieving mild therapeutic hypothermia was equal with both devices. In this study, there was no significant difference in survival with good neurologic function.[5]