On the wall behind three mannequins is a tiny brass plaque.

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Thermocore Medical in England is testing a catheter containing tiny temperature sensors, betting that inflamed plaque is slightly hotter than the rest of the artery.

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It analyzed data from studies conducted by Steven Nissen, head of cardiology at the Cleveland Clinic, that used tiny ultrasound probes to measure the buildup of plaque in patients who were taking common cholesterol-lowering drugs called statins: Pravachol, Lipitor and Crestor.

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