Mitchell R R
Crit Care Med. 1982 Dec;10(12):831-4. doi: 10.1097/00003246-198212000-00005.
The need for closed-loop control of blood pressure in acute hypertension after cardiac surgery was evaluated by estimating the amount of nurse-time required to adjust the infusion rate of sodium nitroprusside. The evaluation consisted of a nationwide telephone survey of head nurses in postsurgical ICUs at 9 institutions performing cardiac surgery. By nurse estimate, the average time spent adjusting the nitroprusside infusion rate was 26% of the time the patients were being infused. When calculated from a hierarchical list of questions, the average nitroprusside adjustment time was 16%. Assuming that a closed-loop controller would be accepted in these ICUs, they would be used 40% of the time that the nurse and patient are on a 1-to-1 basis. It was concluded that a technically acceptable control design exists for clinical use, that at the present time there is a need for such a controller, and that the controller would be accepted by the clinical staff.
通过估算调整硝普钠输注速率所需的护士时间，对心脏手术后急性高血压患者血压闭环控制的必要性进行了评估。评估包括对9家开展心脏手术机构的术后重症监护病房护士长进行的全国性电话调查。据护士估计，调整硝普钠输注速率的平均时间占患者接受输注时间的26%。根据一系列分层问题计算，硝普钠调整的平均时间为16%。假设这些重症监护病房会接受闭环控制器，那么在护士与患者一对一护理期间，闭环控制器的使用时间将占40%。得出的结论是，存在一种技术上可接受的用于临床的控制设计，目前需要这样一种控制器，并且该控制器会被临床工作人员接受。
