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Non-Contact Measurement of Aortic Compliance

This study has been completed.
National Institute for Health Research, United Kingdom
Information provided by (Responsible Party):
Stephen Greenwald, Barts & The London NHS Trust Identifier:
First received: September 15, 2009
Last updated: February 20, 2015
Last verified: February 2015
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).

Vascular Disease

Study Type: Observational
Study Design: Observational Model: Case Control
Time Perspective: Cross-Sectional
Official Title: Non Contact Measurement of Aortic Pulse Wave Velocity

Resource links provided by NLM:

Further study details as provided by Stephen Greenwald, Barts & The London NHS Trust:

Primary Outcome Measures:
  • 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:
  • 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 ]

Enrollment: 80
Study Start Date: September 2010
Study Completion Date: March 2013
Primary Completion Date: June 2012 (Final data collection date for primary outcome measure)
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.


Ages Eligible for Study:   18 Years and older   (Adult, Senior)
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
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Please refer to this study by its identifier: 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
  More Information

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
Study First Received: September 15, 2009
Last Updated: February 20, 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 processed this record on August 23, 2017