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Evaluating the State of Microvessels by Minimum Rise Time (MRT01) (MRT01)

2016年10月13日 更新者：Afeka, The Tel-Aviv Academic College of Engineering

Evaluating an Optical Index (Minimum Rise Time) as a Measure for the State of Microvessels

Photoplethysmography (PPG) is a simple uncalibrated optical method of monitoring variations in skin blood volume. The objective of the current study is to investigate a potential relationship between MRT (minimum rise time, in time units) a measure derived from PPG and the state of microvessels.

This study includes a 1-2 hour single session per subject during which PPG and other microvascular and systemic variables will be monitored in response to non-invasive interventions that are known to elicit microvascular responses.

研究概览

地位

完全的

条件

干预/治疗

详细说明

Photoplethysmography (PPG) is a simple uncalibrated optical method of monitoring variations in skin blood volume. A major limitation of PPG is the lack of a quantitative method for calibrating this signal. A method that provides an absolute measure (in time units) called 'minimum rise time' (MRT) was published in 1985 by Dr. Benjamin Gavish, one of the study investigators. However, a possible relationship between MRT and the state of arterioles that determines the microvascular flow has never been investigated. Such relationship, if validated, could have clinical impact in noninvasive diagnosis of vascular diseases and monitoring microvascular response to treatments that affect at both clinic and home setting.

The objective of the current study is to investigate a potential relationship between variations of MRT (minimum rise time, in time units) and microcirculatory variables induced by interventions that are expected to have acute effect on the state of arterioles and the tissue oxygenation.

This study includes a single 1-2 hour session per subject, during which PPG and other microvascular and systemic variables will be monitored in healthy volunteers in response to a number of non-invasive interventions/device that are approved for clinical use and known to elicit microvascular responses. These interventions are applied consecutively, include breathing at different rates, low power visible light in the red-to-near-infrared range, and local temperature changes. The experimental sessions will be conducted at the Afeka College by the study investigators.

研究类型

介入性

注册 (实际的)

33

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。

学习地点

  • 以色列
      • Tel Aviv、以色列
        • Afeka, Tel-Aviv Academic College of Engineering

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 至 65年 (成人、年长者)

接受健康志愿者

是的

有资格学习的性别

全部

描述

Inclusion Criteria:

  1. Healthy males and females, between 18 and 65 years of age.
  2. Willing to sign informed consent.

Exclusion Criteria:

  1. Currently smoking
  2. Any abnormal skin condition in the area of light irradiation.
  3. Pregnant having given birth less than 3 months ago, and/or breastfeeding.
  4. Having a history of diseases stimulated by heat, such as recurrent Herpes Simplex in the treated area, unless treatment is conducted following a prophylactic regimen.
  5. Having any illness that might affect the vasculature, such as diabetes (type I or II)
  6. Suffering from significant concurrent illness, such as cardiac disorders, , or pertinent neurological disorders.
  7. As per the Investigator's discretion, any physical or mental condition which might make it unsafe for the subject to participate in this study.

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：诊断
  • 分配：随机化
  • 介入模型：并行分配
  • 屏蔽：单身的

武器和干预

参与者组/臂
干预/治疗
实验性的：Red LED
Light emitting diodes, 670 nm, 50 mW/cm2, Quantum Warp10 (Quantum Devices Inc, Barneveld, WI, USA); RESPeRATE; Heat/cold provocation
设备：RESPeRATE (Paced Breathing)
The subjects will be guided by a digital metronome to breath at 15, 10, and 6 breaths/min for 2 minutes each using the metronome function of the device RESPeRATE (InterCure, Israel) that guides breathing using musical tones played at selectable rhythm.
设备：Quantum Warp10 (Red LED)
其他：Heat/cold provocation
Immersion of one foot in a warm water bath ( 43-45 degrees C) for few seconds and then immersion of the same foot in cold water bath (5-7 degrees C) for 1 min.
有源比较器：Near Infrared LED
Light emitting diodes, 830 nm, 55 mW/cm2, Omnilux new-U (Photomedex, Horsham, PA, USA); RESPeRATE; Heat/cold provocation
设备：RESPeRATE (Paced Breathing)
The subjects will be guided by a digital metronome to breath at 15, 10, and 6 breaths/min for 2 minutes each using the metronome function of the device RESPeRATE (InterCure, Israel) that guides breathing using musical tones played at selectable rhythm.
其他：Heat/cold provocation
Immersion of one foot in a warm water bath ( 43-45 degrees C) for few seconds and then immersion of the same foot in cold water bath (5-7 degrees C) for 1 min.
设备：Omnilux new-U (Near Infrared LED)

研究衡量的是什么？

主要结果指标

结果测量
大体时间
MRT as measured from finger Photoplethysmography in response to changes in breathing rate
大体时间：Change from baseline to up to 1 minute after termination of 2 minutes of constant breathing rate (15, 10, and 6 breath/min)
Change from baseline to up to 1 minute after termination of 2 minutes of constant breathing rate (15, 10, and 6 breath/min)
MRT as measured from finger Photoplethysmography in response to light source
大体时间：Change from immediately before exposure to light source to up to 10 minutes after exposure to light source
Change from immediately before exposure to light source to up to 10 minutes after exposure to light source
MRT as measured from finger Photoplethysmography in response to temperature changes
大体时间：Change from immediately before exposure to temperature provocations to up to 2 minutes after exposure to warm water, and up to 2 minutes after exposure to cold water
Change from immediately before exposure to temperature provocations to up to 2 minutes after exposure to warm water, and up to 2 minutes after exposure to cold water

次要结果测量

结果测量
大体时间
Capillary blood flow (red blood cell velocity or flux in 'perfusion units') as measured by laser doppler
大体时间：At baseline, 1 minute after each changes in breathing rate, 5 and 10 minutes after exposure to light source, 1 minutes after each exposure to temperature changes
At baseline, 1 minute after each changes in breathing rate, 5 and 10 minutes after exposure to light source, 1 minutes after each exposure to temperature changes
Transcutaneous oxygen pressure (tcpO2 in mmHg)
大体时间：At baseline, 1 minute after each changes in breathing rate, 5 and 10 minutes after exposure to light source, 1 minutes after each exposure to temperature changes
At baseline, 1 minute after each changes in breathing rate, 5 and 10 minutes after exposure to light source, 1 minutes after each exposure to temperature changes

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

Afeka, The Tel-Aviv Academic College of Engineering

合作者

Sheba Medical Center

调查人员

  • 首席研究员：Moshe Halak, MD、Sheba medical center
  • 研究主任：Zehava Blechman, PhD、Afeka, Tel-Aviv Academic College of Engineering

出版物和有用的链接

负责输入研究信息的人员自愿提供这些出版物。这些可能与研究有关。

一般刊物

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

2015年9月1日

初级完成 (实际的)

2016年6月1日

研究完成 (实际的)

2016年10月1日

研究注册日期

首次提交

2015年7月28日

首先提交符合 QC 标准的

2015年8月17日

首次发布 (估计)

2015年8月18日

研究记录更新

最后更新发布 (估计)

2016年10月17日

上次提交的符合 QC 标准的更新

2016年10月13日

最后验证

2016年10月1日

更多信息

与本研究相关的术语

其他研究编号

  • 2080-15-SMC

计划个人参与者数据 (IPD)

计划共享个人参与者数据 (IPD)？

未定

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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