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Multicentre Study to Investigate the Performance of the Padd Device in the Assessment of Peripheral Arterial Disease

NCT ID: NCT01633710

Last Updated: 2012-07-04

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

TERMINATED

Total Enrollment

86 participants

Study Classification

OBSERVATIONAL

Study Start Date

2009-05-31

Study Completion Date

2010-07-31

Brief Summary

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The study will compare Padd, a non-invasive automated optical device which uses a functional test to assess peripheral arterial disease (PAD), and Ankle brachial pressure index (ABPI) in the detection of PAD using as a gold standard, colour duplex ultrasound, in participants drawn from general practice, a hospital diabetic clinic and a tertiary vascular disease referral centre. The study hypothesis is that Padd performs at least as well as ABPI in detecting PAD.

Detailed Description

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400 participants, with a minimum of 200 participants per site, will be recruited from two centres. At the Royal Free Hospital, London, the inclusion criterion is simply attendance at the vascular clinic; in Leicester patients \>70 years or 50-69 years with a history of diabetes, smoking, known PAD or at least 2 risk factors (previous ischaemic event, hyperlipidaemia, hypertension, family history of cardiovascular disease) will be recruited from both primary care and the hospital diabetes clinic. The anticipated peripheral arterial disease detection rates are approximately 75% in London and 25% in Leicester.

In addition to standard questionnaires, participants will undergo bilateral Padd and resting ABPI. CDU will be performed by an accredited vascular technologist who will employ a scoring method consistent between both sites. The vascular technologist will be blind to the Padd and ABPI results. The results obtained with Padd and ABPI will be compared with CDU as the gold standard for this study.

The primary objectives are:

1. Performance: to compare Padd and ABPI for detecting PAD against a gold standard, CDU, performed by an experienced vascular technologist.
2. Safety: to compare adverse events using Padd, ABPI and expert CDU

The secondary objectives are:

1. to compare time taken to perform Padd and ABPI
2. to calculate specificities for Padd and ABPI
3. to investigate the impact of subject posture on the Padd results
4. to determine if skin colour has any impact on Padd performance

There are no treatments or interventions determined exclusively from the Padd readings.

Conditions

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Peripheral Arterial Disease

Keywords

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Ankle brachial pressure index Colour duplex ultrasound Diabetes Photoplethysmography

Study Design

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Observational Model Type

CASE_ONLY

Study Time Perspective

CROSS_SECTIONAL

Eligibility Criteria

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Inclusion Criteria

1. Royal Free Hospital - patients \>50 years old referred to the vascular clinic for suspected peripheral arterial disease
2. Leicester

* age 70 years or older
* age 50-69 years with a history of smoking, diabetes or peripheral arterial disease
* 50-69 years with at least two peripheral arterial disease risk factors (hyperlipidaemia, hypertension, family history of cardiovascular disease, previous ischaemic event: myocardial infarction, stroke and TIA)

Exclusion Criteria

1. bilateral amputation that precludes placement of the Padd sensors on the feet
2. acute deep venous thrombosis, within the previous six months (application of ABPI pressure cuff on legs is not advisable for these patients)
3. skin damage or infection that precludes placement of sensors
4. active psychotic illness or severe cognitive impairment
5. inability to lie supine
Minimum Eligible Age

50 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

No

Sponsors

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University Hospitals, Leicester

OTHER

Sponsor Role lead

Responsible Party

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University of Leicester

Principal Investigators

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Kamlesh Khunti, MB BS

Role: PRINCIPAL_INVESTIGATOR

University of Leicester

Locations

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University of Leicester

Leicester, Leicestershire, United Kingdom

Site Status

Royal Free Hospital

London, London, United Kingdom

Site Status

Countries

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United Kingdom

Other Identifiers

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DDL-2009-01

Identifier Type: -

Identifier Source: org_study_id