Non-Contact Measurement of Aortic Compliance

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00987181
Recruitment Status : Completed
First Posted : September 30, 2009
Last Update Posted : February 23, 2015
National Institute for Health Research, United Kingdom
Information provided by (Responsible Party):
Stephen Greenwald, Barts & The London NHS Trust

Brief Summary:
Reduced aortic stiffness is a powerful way to predict the outcome of cardiovascular (CV) disease. There are several non invasive methods for its estimation, most of which are based on the measurement of speed of the arterial pulse wave. (The stiffer the artery, the faster the pulse wave travels.) They rely on detecting the arterial pulse with 2 sensors placed on the skin a known distance apart and measuring the time for the pulse to travel between them. However all current methods require skilled operators and are of limited accuracy. Thus, there is a need for an easy to use and reliable device to measure pulse speed. The aim of this project is to develop a non contact device to detect the aortic pulse as it moves into the small arteries following the ribs, using the principle of thermal imaging, by means of a high sensitivity infra red camera, directed towards the subjects back. The investigators plan to validate the device and conduct a small feasibility study in patients undergoing elective angiography, by simultaneously measuring pulse speed using established methods. These are Doppler ultrasound (non-invasive) and direct intra-arterial measurement (the gold standard).

Condition or disease
Vascular Disease

Study Type : Observational
Actual Enrollment : 80 participants
Observational Model: Case Control
Time Perspective: Cross-Sectional
Official Title: Non Contact Measurement of Aortic Pulse Wave Velocity
Study Start Date : September 2010
Actual Primary Completion Date : June 2012
Actual Study Completion Date : March 2013

Resource links provided by the National Library of Medicine

Angiography high risk
Patients with multiple risk factors, positive non-invasive test, or known pre-existing coronary artery/vascular disease. Patients with diabetes mellitus will be identified, and subject to a sub-group analysis.
Angiography Low Risk
Patients with chest pain symptoms, minimal risk factors, and inconclusive evidence of myocardial ischaemia on non-invasive testing.

Primary Outcome Measures :
  1. Quantitative agreement between intra-arterial measurement of aortic pulse wave velocity and transcutaneous values: a) Contact PPG from probes on the skin of the back in the intercostal spaces and b) non-contact from infra-red camera imaging the back. [ Time Frame: Single measurement to be made between January 2010 and June 2010 ]

Secondary Outcome Measures :
  1. Assessment of differences in aPWV and between low and high risk groups of patients undergoing elective coronary angiography. [ Time Frame: Single measurement to be made between January 2010 and June 2010 ]

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Sampling Method:   Non-Probability Sample
Study Population
Non-interventional cardiology clinic. Patients undergoing elective angiography.

Inclusion Criteria:

  • Age 18 years and above
  • Patients eligible for coronary angiography
  • Informed consent obtained
  • Able to complete experimental protocol

Exclusion Criteria:

  • Refusal of consent
  • Age below 18 years
  • Breast feeding
  • Known or suspected pregnancy
  • Patient participating in another study at time of study entry or previous participation in this registry
  • diagnosed but untreated hypertension

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00987181

United Kingdom
London Chest Hospital
London, United Kingdom, E2 9JX
Sponsors and Collaborators
Barts & The London NHS Trust
National Institute for Health Research, United Kingdom
Principal Investigator: Stephen E Greenwald, PhD Queen Mary University of London, Barts & The London School of Medicine & Dentistry

Responsible Party: Stephen Greenwald, Professor of Cardiovascular Mechanics, Barts & The London NHS Trust Identifier: NCT00987181     History of Changes
Other Study ID Numbers: II-FS-0109-11005
i4i Track 1
First Posted: September 30, 2009    Key Record Dates
Last Update Posted: February 23, 2015
Last Verified: February 2015

Keywords provided by Stephen Greenwald, Barts & The London NHS Trust:
Pulse wave velocity
Non contact
Doppler flow velocimetry

Additional relevant MeSH terms:
Vascular Diseases
Cardiovascular Diseases