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Cerebral Autoregulation and Delirium Study (AUTO-POD)

2026年6月22日 更新者：University Health Network, Toronto

Reducing Delirium After Cardiac Surgery: Personalized Targeted Blood Pressure Management Strategy Using Cerebral Autoregulation Monitoring: A Pilot Study

Approximately one in four elderly patients develops postoperative delirium (POD) after cardiac surgery. POD is associated with prolonged hospitalization, increased mortality, and higher health care costs. While patient-related risk factors are often difficult to modify, surgery- and anesthesia-related factors may be optimized to reduce the incidence of POD. One potentially modifiable factor is intraoperative blood pressure management. Current practice commonly relies on standardized blood pressure targets during cardiac surgery; however, this "one-size-fits-all" approach may not account for individual variability in cerebral perfusion requirements. This study proposes a personalized blood pressure management strategy based on real-time monitoring of cerebral autoregulation, with the goal of maintaining optimal cerebral perfusion and protecting the brain from both hypo- and hyper-perfusion

研究概览

地位

尚未招聘

条件

干预/治疗

详细说明

The primary aim of this pilot study is to evaluate the feasibility of conducting a subsequent definitive trial by assessing recruitment rates, protocol adherence, and the completeness and quality of short-term outcome data collection. The pilot study will also provide an opportunity to identify potential challenges and optimize the design of the larger trial, if necessary.

If the study hypothesis is confirmed and subsequently reproduced in larger, rigorous clinical trials, the findings could have important implications for intraoperative blood pressure management in elderly patients undergoing cardiac surgery. Specifically, this research may support a transition from the current "one-size-fits-all" blood pressure management strategy toward an individualized, real-time approach guided by cerebral autoregulation monitoring. Such a personalized strategy could potentially reduce the incidence of postoperative delirium (POD) in this high-risk population.

Conversely, premature implementation of personalized blood pressure management based solely on the currently available preliminary evidence may lead to unintended adverse consequences. Therefore, the proposed pilot study is essential to provide critical feasibility and safety data before proceeding to a larger definitive trial.

This study will be conducted as a prospective, single-centre, randomized controlled clinical trial comparing a real-time cerebral autoregulation monitoring-based blood pressure management strategy with standard care. Participants will be randomized into two groups:

Intervention Group: Blood pressure management guided by real-time cerebral autoregulation monitoring.

Control Group: Standard intraoperative blood pressure management according to current institutional practice.

研究类型

介入性

注册 (估计的)

60

阶段

  • 不适用

联系人和位置

本节提供了进行研究的人员的详细联系信息，以及有关进行该研究的地点的信息。

学习联系方式

研究联系人备份

参与标准

研究人员寻找符合特定描述的人，称为资格标准。这些标准的一些例子是一个人的一般健康状况或先前的治疗。

资格标准

适合学习的年龄

  • 成人
  • 年长者

接受健康志愿者

不

描述

Inclusion Criteria:

• Consenting patients aged ≥ 60 years undergoing elective complex cardiac surgery (coronary artery bypass grafting plus valve surgery, double-valve surgery, triple-valve surgery, redo operations, or aortic arch surgery), or patients aged ≥ 70 years undergoing isolated coronary artery bypass grafting or single-valve repair/replacement surgery.

Exclusion Criteria:

  • Patients with symptomatic cerebrovascular disease.
  • History of delirium.
  • Major neurocognitive impairment (e.g., dementia or Mini-Mental State Examination score < 10).
  • Schizophrenia.

学习计划

本节提供研究计划的详细信息，包括研究的设计方式和研究的衡量标准。

研究是如何设计的？

设计细节

  • 主要用途：预防
  • 分配：随机化
  • 介入模型：并行分配
  • 屏蔽：双倍的

武器和干预

参与者组/臂
干预/治疗
实验性的：Intervention Group:

Participants randomized to the intervention group will receive individualized intraoperative blood pressure management guided by real-time cerebral autoregulation monitoring to protect against both hypo- and hyper-cerebral perfusion.

Cerebral autoregulation will be assessed using the cerebral blood volume reactivity index (VRx), defined as the Pearson correlation coefficient between blood volume index (BVI) and mean arterial pressure (MAP). The lower and upper limits of autoregulation will be identified as the MAP values at which VRx exceeds 0.3.

If VRx remains outside the autoregulatory range for more than 60 seconds, the anesthesiologist may intervene to restore MAP within the individualized autoregulatory zone. The type and sequence of interventions will be at the discretion of the attending anesthesiologist.
设备：Mespere NeuroOs (Mespere Life Sciences) monitor
bilateral Mespere NeuroOs cerebral oximeter sensors will be placed on the fronto-temporal area on the fronto-temporal area of all patients.
有源比较器：Control Group:
In the control group, the cerebral oximetry monitor will be electronically blinded, although data will be continuously recorded for subsequent analysis. Intraoperative blood pressure management will follow current institutional standard practice at the discretion of the attending anesthesiologist.
设备：Mespere NeuroOs (Mespere Life Sciences) monitor
bilateral Mespere NeuroOs cerebral oximeter sensors will be placed on the fronto-temporal area on the fronto-temporal area of all patients.

研究衡量的是什么？

主要结果指标

结果测量
措施说明
大体时间
Recruitment rate
大体时间：2 year
1. Recruitment rate: Percentage of eligible patients enrolled in the study (feasibility target: >10%).
2 year
Non-adherence with the protocol
大体时间：2 year
Non-adherence with the protocol (percentage of patients with VRx > 0.3 where no intervention was performed; <10%)
2 year
Completeness and quality of POD assessment
大体时间：2 year
Completeness and quality of POD assessment (percent of patients for whom all CAM-ICU assessments are complete and conclusive; > 90%)
2 year

次要结果测量

结果测量
措施说明
大体时间
Overall incidence of impaired cerebral autoregulation
大体时间：2 year
Overall incidence of impaired cerebral autoregulation in the intervention and control groups.
2 year
Percentage of patients in whom attempted restoration
大体时间：2 year
Percentage of patients in whom attempted restoration of VRx to autoregulation range was unsuccessful
2 year
The number of interventions required
大体时间：2 year
The number of interventions required to restore VRx to autoregulation range
2 year

其他结果措施

结果测量
措施说明
大体时间
Tertiary Outcomes: . Frequency of POD
大体时间：2 year
Frequency of postoperative delirium (POD) up to postoperative day 3 in both study groups (primary outcome for the definitive trial).
2 year
Tertiary Outcomes: A composite outcome of major end organ dysfunction
大体时间：2 year
A composite outcome of major end organ dysfunction defined as major organ morbidity and mortality (MOMM) and all cause 30-day mortality.
2 year
Tertiary Outcomes: Postoperative quality of recovery
大体时间：2 year
Postoperative quality of recovery score QoR-15 survey will be performed at baseline, and postoperative days 1 to 3 (or discharge if earlier).
2 year

合作者和调查者

在这里您可以找到参与这项研究的人员和组织。

赞助

University Health Network, Toronto

调查人员

  • 首席研究员：George Djaiani、Toronto General Hospital

研究记录日期

这些日期跟踪向 ClinicalTrials.gov 提交研究记录和摘要结果的进度。研究记录和报告的结果由国家医学图书馆 (NLM) 审查，以确保它们在发布到公共网站之前符合特定的质量控制标准。

研究主要日期

学习开始 (估计的)

2026年6月1日

初级完成 (估计的)

2028年6月30日

研究完成 (估计的)

2028年6月30日

研究注册日期

首次提交

2026年5月21日

首先提交符合 QC 标准的

2026年6月22日

首次发布 (实际的)

2026年6月26日

研究记录更新

最后更新发布 (实际的)

2026年6月26日

上次提交的符合 QC 标准的更新

2026年6月22日

最后验证

2026年5月1日

更多信息

与本研究相关的术语

关键字

其他相关的 MeSH 术语

其他研究编号

  • 25-5746

计划个人参与者数据 (IPD)

计划共享个人参与者数据 (IPD)？

未定

IPD 计划说明

No plan yet

药物和器械信息、研究文件

研究美国 FDA 监管的药品

不

研究美国 FDA 监管的设备产品

不

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