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BMI-Adjusted PEEP During One-Lung Ventilation in Thoracic Surgery (SIMPLE-PEEP)

2026年10月8日 更新者：Jesús Manuel Nieves Alonso

Effect of Body Mass Index-Adjusted Positive End-Expiratory Pressure on Respiratory Mechanics During One-Lung Ventilation in Thoracic Surgery

One-lung ventilation (OLV) is required during many thoracic surgical procedures and is associated with reduced functional residual capacity, atelectasis, ventilation-perfusion mismatch, hypoxemia, and potentially ventilator-induced lung injury. Lung-protective ventilation strategies include low tidal volumes, limitation of airway pressures, and positive end-expiratory pressure (PEEP), but the optimal PEEP level during OLV remains uncertain. Fixed PEEP is simple and reproducible but does not account for individual patient characteristics. Body mass index (BMI) is readily available before anesthesia and is associated with respiratory mechanics, making it a pragmatic candidate for simple PEEP individualization.

SIMPLE-PEEP is a prospective, multicenter, pragmatic, open-label, randomized clinical trial including 150 adults undergoing elective pulmonary resection under general anesthesia requiring OLV. Participants will be randomized to either fixed PEEP of 4 cmH2O or BMI-adjusted PEEP calculated as BMI/3 cmH2O. Other key components of lung-protective ventilation will be standardized between groups.

The primary outcome is driving pressure during the first 20 minutes of OLV, assessed at 5, 10, and 20 minutes after OLV initiation. Secondary outcomes include respiratory system compliance and other respiratory mechanics, estimated mechanical power, oxygenation, intraoperative hypoxemia and rescue maneuvers, hemodynamic safety, vasopressor requirements, and exploratory postoperative respiratory outcomes. No investigational medicinal product, additional invasive procedure, or study-specific advanced monitoring is required.

研究概览

地位

招聘中

条件

干预/治疗

研究类型

介入性

注册 (估计的)

150

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

  • 姓名：Jesús M Nieves Alonso, MD
  • 电话号码：+34915202540
  • 邮箱：jesusmna@gmail.com

学习地点

  • 西班牙
    • Catalonia
      • Barcelona、Catalonia、西班牙、08036
        • 尚未招聘
        • Hospital Clinic Barcelona
        • 接触：
      • Barcelona、Catalonia、西班牙、08041
        • 尚未招聘
        • Hospital de la Santa Creu i Sant Pau
        • 接触：
    • Madrid
      • Madrid、Madrid、西班牙、28006
        • 招聘中
        • Hospital Universitario de La Princesa
        • 接触：
      • Madrid、Madrid、西班牙、28007
        • 尚未招聘
        • Hospital General Universitario Geogorio Marañón
        • 接触：

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

18年 及以上 (成人、年长者)

接受健康志愿者

不

有资格学习的性别

全部

描述

Inclusion Criteria:

  1. Age 18 years or older.
  2. Scheduled thoracic surgery for pulmonary resection requiring general anesthesia and one-lung ventilation.
  3. Written informed consent obtained before any study-specific procedure.

Exclusion Criteria:

  1. Simultaneous participation in another interventional clinical trial that could interfere with the protocol.
  2. Severe hemodynamic instability before the start of the procedure, defined as continuous vasopressor infusion or shock of any etiology.
  3. Severe restrictive lung disease, defined as total lung capacity <50% of predicted or forced vital capacity <50% of predicted.
  4. Body mass index >45 kg/m2.

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：支持治疗
  • 分配：随机化
  • 介入模型：并行分配
  • 屏蔽：无（打开标签）

武器和干预

参与者组/臂
干预/治疗
有源比较器：Fixed PEEP of 4 cmH2O
程序：Fixed PEEP

Fixed PEEP of 4 cmH2O
实验性的：BMI-adjusted PEEP calculated as BMI/3 cmH2O
程序：BMI-adjusted PEEP

BMI-adjusted PEEP calculated as BMI/3 cmH2O

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
Driving pressure during the primary T2-T4 window
大体时间：20 minutes

Driving pressure during the primary T2-T4 window, measured at 5, 10, and 20 minutes after initiation of one-lung ventilation and expressed in cmH2O.

In conventional volume-controlled ventilation, driving pressure is calculated as plateau pressure minus applied PEEP.

In pressure-regulated volume-targeted/volume-guaranteed modes, driving pressure is calculated as total end-inspiratory pressure minus applied PEEP.
20 minutes

次要结果测量

结果测量
措施说明
大体时间
Respiratory system compliance
大体时间：At 5, 10, and 20 minutes after initiation of one-lung ventilation; at 60 minutes when applicable; and at the end of one-lung ventilation, all during the surgical procedure on Day 1.

Respiratory system compliance will be calculated at each applicable time point as tidal volume divided by driving pressure and expressed in mL/cmH2O
At 5, 10, and 20 minutes after initiation of one-lung ventilation; at 60 minutes when applicable; and at the end of one-lung ventilation, all during the surgical procedure on Day 1.
Driving pressure at 60 minutes and at the end of one-lung ventilation
大体时间：At 60 minutes after initiation of one-lung ventilation, when applicable, and at the end of one-lung ventilation.

Driving pressure will be assessed at 60 minutes after initiation of one-lung ventilation, when this time point is applicable, and at the actual end of one-lung ventilation, to evaluate the persistence of the physiological effect of the assigned PEEP strategy.
At 60 minutes after initiation of one-lung ventilation, when applicable, and at the end of one-lung ventilation.
Estimated mechanical power during one-lung ventilation
大体时间：At 5, 10, and 20 minutes after initiation of one-lung ventilation; at 60 minutes when applicable; and at the end of one-lung ventilation, all during the surgical procedure on Day 1.

Ventilatory mechanical power will be estimated from prospectively recorded ventilatory parameters using a prespecified calculation method appropriate to the ventilation mode and expressed in J/min.
At 5, 10, and 20 minutes after initiation of one-lung ventilation; at 60 minutes when applicable; and at the end of one-lung ventilation, all during the surgical procedure on Day 1.
Incidence of intraoperative hypoxemia during one-lung ventilation
大体时间：From initiation until completion of one-lung ventilation during the surgical procedure on Day 1 (up to 1 day).

Intraoperative hypoxemia will be defined as SpO2 <90% sustained for at least 60 seconds during one-lung ventilation with baseline FiO2 0.6, or any episode of SpO2 <90% requiring immediate clinical intervention at the discretion of the attending anesthesiologist.
From initiation until completion of one-lung ventilation during the surgical procedure on Day 1 (up to 1 day).
Incidence of major ventilatory rescue
大体时间：During the first 20 minutes after initiation of one-lung ventilation on Day 1.

Major ventilatory rescue during the first 20 minutes after initiation of one-lung ventilation will be defined as any intervention that substantially modifies the assigned ventilatory strategy or respiratory mechanics, including modification of PEEP from the assigned value, recruitment maneuver, CPAP to the non-ventilated lung, temporary restoration of two-lung ventilation, or protocol interruption for safety reasons.
During the first 20 minutes after initiation of one-lung ventilation on Day 1.
Incidence of intraoperative hypotension
大体时间：Intraoperative/periprocedural period on Day 1, from induction of anesthesia until the end of surgery.

Intraoperative hypotension will be defined as mean arterial pressure <65 mmHg sustained for more than 1 minute.
Intraoperative/periprocedural period on Day 1, from induction of anesthesia until the end of surgery.
Requirement for intraoperative vasopressor support
大体时间：Time Frame: Intraoperative/periprocedural period on Day 1, from induction of anesthesia until the end of surgery.

Proportion of participants requiring vasopressor administration during the intraoperative period. Vasopressor use will be recorded as a measure of the hemodynamic safety of the assigned PEEP strategy.
Time Frame: Intraoperative/periprocedural period on Day 1, from induction of anesthesia until the end of surgery.
Incidence of postoperative pulmonary complications
大体时间：From the end of surgery until hospital discharge during the index hospitalization (estimated average duration: 3-10 days).

Occurrence of at least one prespecified postoperative pulmonary complication, including acute respiratory failure, pneumonia, acute respiratory distress syndrome, atelectasis, pneumothorax, bronchopleural fistula, aspiration pneumonitis, pulmonary embolism, pleural empyema, bronchospasm, pleural effusion, or need for postoperative respiratory support or reintubation for respiratory deterioration. This outcome will be considered exploratory.
From the end of surgery until hospital discharge during the index hospitalization (estimated average duration: 3-10 days).

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

Jesús Manuel Nieves Alonso

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 (实际的)

2026年10月7日

初级完成 (估计的)

2028年3月1日

研究完成 (估计的)

2028年3月30日

研究注册日期

首次提交

2026年9月21日

首先提交符合 QC 标准的

2026年9月25日

首次发布 (实际的)

2026年10月1日

研究记录更新

最后更新发布 (实际的)

2026年10月9日

上次提交的符合 QC 标准的更新

2026年10月8日

最后验证

2026年10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

  • SIMPLE-PEEP

计划个人参与者数据 (IPD)

计划共享个人参与者数据 (IPD)？

未定

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

此信息直接从 clinicaltrials.gov 网站检索，没有任何更改。如果您有任何更改、删除或更新研究详细信息的请求，请联系 register@clinicaltrials.gov. clinicaltrials.gov 上实施更改，我们的网站上也会自动更新.

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