During coronaryangiography, a thin tube (catheter) is threaded through a blood vessel into the heart, where a special dye is injected.
在冠状动脉造影时，一个细管(导管)通过血管进入心脏，注入一种特殊的染料。
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To examine whether there might be placebo effects on the heart arteries, Meissner and Ronel's team looked at 30 patients who underwent coronaryangiography to evaluate chest pain symptoms.