In a placebo-controlled study, one group of patients would have undergone PTMR, while another would have had a catheter inserted, but no holes would have been made in the heart.

• 在安慰剂对照研究设计中，应该是一组病人进行PTMR，而另外一组则仅插入导管，但是没有在心脏上钻洞，而且参加者在研究完成之前不知道他们是否接受了激光治疗。