After heart bracket art, prothorax still labor pains why?

心脏支架术后，前阵痛为什么？

The cloth on prothorax backboard and elytrum has fine stipple, elytrum bounty, mutual black round spot becomes 3 rank 10 times slightly.

前背板鞘上布有细点刻,鞘,共有黑色圆斑10个略成3横列。