It is concluded that at the concentrations achieved with usual clinical doses, thiopental, promethazine and droperidol can inhibit the VDC whereas ketamine and fentanyl can not.

• 临床剂量的硫喷妥钠、异丙嗪、氟哌利多可抑制VDC的开启，而临床剂量的氯胺酮、芬太尼则不能抑制VDC的开启。