held如何对立统一

CCB 

These agents have significant negative inotropic properties and may precipitate or worsen HF in patients with a depressed LVEF or apparent HF. Therefore, these agents are not commonly used in patients with HF. In patients who take CCB as a part of their home medication regimen, CCB frequently have to be held preoperatively.

钙通道阻滞剂

这些药物具有明显的负性肌力作用并且在LVEF降低或明显心衰的患者中可能加重心衰。因此，这些药物通常不用于心衰患者。对于采用钙通道阻滞剂作为家庭用药方案的患者，术前建议   钙通道阻滞剂。

这里held是停药的意思吧？

held也有也有继续的意思？什么时候是继续？什么时候是暂停？这两个意思如何对立统一