Microwave Radiometry Thermometry for the Diagnosis of Critical Limb Ischemia in Diabetic Patients

April 14, 2020 updated by: Stavros Spiliopoulos, Attikon Hospital

Microwave Radiometry Thermometry for Non-invasive Diagnosis of Arterial Disease in Diabetic Patients With Suspected Critical Limb Ischemia: A Multi-centre Feasibility Study

Diagnosis of vascular involvement in diabetic foot disease remains challenging. Differential diagnosis between pure neuropathic or neuro-ischemic diabetic foot requires a combination of clinical examination, medical history and ankle-brachial index (ABI) measurement, which is considered the "gold standard" non-invasive modality for limb ischemia diagnosis. However, in diabetic patients with suspected arterial ischemia resulting in tissue loss (critical limb ischemia; CLI), false negative ABI results are frequent due to Monckeberg medial sclerosis producing incompressible vessels, while clinical signs are subjective and not accurate in posing definite diagnosis of CLI.

The investigators conducted a proof of concept study of the feasibility of microwave radiometry thermometry for non-invasive diagnosis of CLI in diabetic patients with tissue loss.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

This is a prospective, multi-centre, trial designed to investigate the he feasibility and efficacy of microwave radiometry thermometry for non-invasive diagnosis of CLI in diabetic patients with tissue loss. The study included 80 patients, equally divided in four groups. Group N: normal subjects; group DN: diabetic patients with verified neuropathic ulcers without vascular involvement; group DC: diabetic patients with CLI and group NDC: non-diabetic patients with CLI. All patients underwent MWR with the RTM -01-RES device (University of Bolton, UK) to record the mean internal tissue temperature of the foot. MWR is based on the principle that the intensity of radiation is proportional to tissue temperature. The specific device is not commercially available and has been developed to detect temperatures from internal tissues at microwave frequencies. Foot temperature measurements were performed as near as possible at the site of ulceration in patients of groups DN, DC and NDC and in various sites in subjects of control group N.

Study Type

Interventional

Enrollment (Actual)

80

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Greece
    • Achaia
      • Rio, Achaia, Greece, 26500
        • Patras University Hospital
    • Attiki
      • Athens, Attiki, Greece, 12461
        • Attiko University General Hospital
  • United Kingdom
      • Bolton, United Kingdom, BL3 5AB
        • Institute for Materials Research and Innovation, University of Bolton

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

18 years to 90 years (Adult, Older Adult)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • Patients suffering from both insulin and not insulin dependent diabetes mellitus.
  • Critical limb ischemia verified by both clinical examination, haemodynamic tests and digital subtraction angiography.

Exclusion Criteria:

  • Uncertainty regarding the absence of peripheral arterial disease in groups N and DN.
  • Uncertainty regarding the diagnosis of critical limb ischemia for patients in groups DC and NDC.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Diagnostic
  • Allocation: Non-Randomized
  • Interventional Model: Parallel Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Active Comparator: Group N
Healthy volunteers without peripheral arterial disease according to clinical examination and Duplex ultrasound
Other: Tissue thermometry using non-invasive microwave radiometry device
In Patients included in the four study groups underwent non-invasive tissue thermometry using microwave radiometry (MWR) device, at the same room temperature and with the same methodology. Specifically, the probe of the RTM-01-RES (University of Bolton, UK) device was by applied on the surface of the foot tissue at an angle of 90o degrees for approximately 8 to 10 seconds in pre-determined sites. Measurements were performed by two independent operators. Three measurements were taken from each site. The mean value of the three values calculated by the 2 different operators was used for the analysis. Measurements were recorded using a dedicated software.
Experimental: Group DN
Patients suffering from diabetes and diabetic foot without vascular compromise according to clinical assessment continuous-wave Doppler and Duplex ultrasound
Other: Tissue thermometry using non-invasive microwave radiometry device
In Patients included in the four study groups underwent non-invasive tissue thermometry using microwave radiometry (MWR) device, at the same room temperature and with the same methodology. Specifically, the probe of the RTM-01-RES (University of Bolton, UK) device was by applied on the surface of the foot tissue at an angle of 90o degrees for approximately 8 to 10 seconds in pre-determined sites. Measurements were performed by two independent operators. Three measurements were taken from each site. The mean value of the three values calculated by the 2 different operators was used for the analysis. Measurements were recorded using a dedicated software.
Experimental: Group DC
Diabetic patients with Rutherford-Becker 5 or 6 critical limb ischemia, verified by clinical examination, abnormal continuous-wave Doppler or Duplex ultrasound and intra-arterial angiography.
Other: Tissue thermometry using non-invasive microwave radiometry device
In Patients included in the four study groups underwent non-invasive tissue thermometry using microwave radiometry (MWR) device, at the same room temperature and with the same methodology. Specifically, the probe of the RTM-01-RES (University of Bolton, UK) device was by applied on the surface of the foot tissue at an angle of 90o degrees for approximately 8 to 10 seconds in pre-determined sites. Measurements were performed by two independent operators. Three measurements were taken from each site. The mean value of the three values calculated by the 2 different operators was used for the analysis. Measurements were recorded using a dedicated software.
Experimental: Group NDC
Non diabetic patients with Rutherford-Becker 5 or 6 critical limb ischemia, verified by clinical examination, abnormal continuous-wave Doppler or Duplex ultrasound and intra-arterial angiography.
Other: Tissue thermometry using non-invasive microwave radiometry device
In Patients included in the four study groups underwent non-invasive tissue thermometry using microwave radiometry (MWR) device, at the same room temperature and with the same methodology. Specifically, the probe of the RTM-01-RES (University of Bolton, UK) device was by applied on the surface of the foot tissue at an angle of 90o degrees for approximately 8 to 10 seconds in pre-determined sites. Measurements were performed by two independent operators. Three measurements were taken from each site. The mean value of the three values calculated by the 2 different operators was used for the analysis. Measurements were recorded using a dedicated software.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
Mean foot tissue temperature
Time Frame: 15 minutes
15 minutes

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Attikon Hospital

Collaborators

University Hospital of Patras
Bolton Research Foundation

Investigators

  • Study Chair: Elias Brountzos, MD, PhD, Attiko University General Hospital

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

January 1, 2016

Primary Completion (Actual)

November 1, 2016

Study Completion (Actual)

November 1, 2016

Study Registration Dates

First Submitted

December 21, 2016

First Submitted That Met QC Criteria

December 22, 2016

First Posted (Estimate)

December 23, 2016

Study Record Updates

Last Update Posted (Actual)

April 15, 2020

Last Update Submitted That Met QC Criteria

April 14, 2020

Last Verified

April 1, 2020

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

  • EBΔ 1310/10-2-16

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

UNDECIDED

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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