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Automated ABPI in Peripheral Arterial Disease a Pilot Study (AUTO-PAD)

30. September 2026 aktualisiert von: Hull University Teaching Hospitals NHS Trust

Assessing the Diagnostic Accuracy of AUTOmated Ankle-Brachial Pressure Index Devices Across the Spectrum of Peripheral Arterial Disease (AUTO-PAD)- A Pilot Study

The aim of this pilot study is to investigate the diagnostic accuracy of two automated ABPI devices across the spectrum of PAD (asymptomatic PAD, suspected symptomatic PAD [IC; including mild moderate and severe IC based on the Rutherford classification (21) and CLTI] and post-bypass surveillance). A second aim is to assess their useability and tolerability through semi-structured interviews with patients and clinicians. This means the research will be split into two workstreams.

Studienübersicht

Status

Rekrutierung

Bedingungen

Intervention / Behandlung

Studientyp

Beobachtungs

Einschreibung (Geschätzt)

400

Kontakte und Standorte

Dieser Abschnitt enthält die Kontaktdaten derjenigen, die die Studie durchführen, und Informationen darüber, wo diese Studie durchgeführt wird.

Studienkontakt

Studieren Sie die Kontaktsicherung

Studienorte

Teilnahmekriterien

Forscher suchen nach Personen, die einer bestimmten Beschreibung entsprechen, die als Auswahlkriterien bezeichnet werden. Einige Beispiele für diese Kriterien sind der allgemeine Gesundheitszustand einer Person oder frühere Behandlungen.

Zulassungskriterien

Studienberechtigtes Alter

18 Jahre und älter (Erwachsene, Älterer Erwachsener)

Akzeptiert gesunde Freiwillige

Ja

Studienberechtigte Geschlechter

Alle

Probenahmeverfahren

Nicht-Wahrscheinlichkeitsprobe

Studienpopulation

Group 1: Asymptomatic PAD:

Patients identified by the GP (PIC sites). Records screened to identify 'at risk' of PAD with >1 cardiovascular disease risk factor

Group 2: Suspected symptomatic PAD:

2a. Patients with suspected IC referred to dedicated nurse-led claudication clinic.

Group 2b. Patients with suspected CLTI referred to dedicated urgent vascular (HOT) clinic.

Group 3: Patients undergoing surveillance seen in dedicated clinics by vascular scientists

Beschreibung

Inclusion Criteria:

Group 1: Asymptomatic

  • Adults aged 18 and over
  • At risk of PAD with ≥1 cardiovascular risk factor
  • No previous diagnosis of PAD
  • English speaking and able to understand test protocols

Group 2a: Suspected PAD (intermittent claudication)

  • Adults aged 18 and over
  • Referred and booked into the nurse-led claudication clinic due to signs/symptoms in keeping with suspected intermittent claudication
  • English speaking and able to understand test protocols

Group 2b: Suspected PAD (CLTI)

  • Adults aged 18 and over
  • Referred and booked into the vascular HOT clinic due to signs/symptoms in keeping with suspected CLTI
  • English speaking and able to understand test protocols

Group 3: Post-bypass surveillance

  • Adults aged 18 and over
  • History of lower limb bypass surgery, enrolled in and attending the local surveillance programme
  • English speaking and able to understand test protocols

Exclusion Criteria:

  • Patients who are unable to provide informed consent
  • Recent (≤4 weeks) lower-limb surgery
  • Ulcers, casts or bandages that cannot or should not be compressed
  • Patients who have had a therapeutic intervention (stent or graft) which extends to the ankle
  • Patients with known or suspected acute deep vein thrombosis (DVT) or superficial thrombophlebitis
  • Marked oedema in one or both feet
  • Inability to tolerate a supine position
  • Patients with spasms or tremors of any kind
  • Arm arteriovenous fistula
  • Inability to cooperate due to impaired cognition

Studienplan

Dieser Abschnitt enthält Einzelheiten zum Studienplan, einschließlich des Studiendesigns und der Messung der Studieninhalte.

Wie ist die Studie aufgebaut?

Designdetails

  • Beobachtungsmodelle: COHORT
  • Zeitperspektiven: CROSS_SECTIONAL

Kohorten und Interventionen

Gruppe / Kohorte
Intervention / Behandlung
Group 1 Asymptomatic

Participants with one or more CVD risk factors

The MESI mTablet uses 3CUFFTM technology to detect pulse waveforms to assess ABPI. This involves placing a blood pressure cuff on all 4 limbs at the same time. The two arm cuffs then inflate and simultaneously measure the blood pressure in both brachial arteries. The cuff with the highest systolic pressure than reinflates with both the ankle cuffs simultaneously. The ABPI is then calculated and displayed on the tablet. A ratio of <0.9 will indicate the presence of PAD.

The BlueDop device is a cuffless device which comprises an egg-shaped handheld probe component and an output monitor device. The device measures mean arterial blood pressure through an algorithm. Simply, it calculates the average blood pressure based on the normal rise and fall of pressure during each heartbeat. The device then automatically generates an ankle-brachial pressure index and a corresponding traffic-light classification for each lower-limb artery, based on waveform. This output is interpreted using table 2 below. Essentially an ABPI of 0.8-1.0 with a biphasic or triphasic waveform indicates no disease whereas an ABPI <0.8 and / or a monophasic/non-specific waveform indicates the presence of PAD.

Group 2a Suspected PAD (intermittent claudication)

Partcipants presenting with Suspected PAD (intermittent claudication)

The MESI mTablet uses 3CUFFTM technology to detect pulse waveforms to assess ABPI. This involves placing a blood pressure cuff on all 4 limbs at the same time. The two arm cuffs then inflate and simultaneously measure the blood pressure in both brachial arteries. The cuff with the highest systolic pressure than reinflates with both the ankle cuffs simultaneously. The ABPI is then calculated and displayed on the tablet. A ratio of <0.9 will indicate the presence of PAD.

The BlueDop device is a cuffless device which comprises an egg-shaped handheld probe component and an output monitor device. The device measures mean arterial blood pressure through an algorithm. Simply, it calculates the average blood pressure based on the normal rise and fall of pressure during each heartbeat. The device then automatically generates an ankle-brachial pressure index and a corresponding traffic-light classification for each lower-limb artery, based on waveform. This output is interpreted using table 2 below. Essentially an ABPI of 0.8-1.0 with a biphasic or triphasic waveform indicates no disease whereas an ABPI <0.8 and / or a monophasic/non-specific waveform indicates the presence of PAD.

Group 2b Suspected PAD (CLTI)

Participants presenting with tissue loss or rest pain

The MESI mTablet uses 3CUFFTM technology to detect pulse waveforms to assess ABPI. This involves placing a blood pressure cuff on all 4 limbs at the same time. The two arm cuffs then inflate and simultaneously measure the blood pressure in both brachial arteries. The cuff with the highest systolic pressure than reinflates with both the ankle cuffs simultaneously. The ABPI is then calculated and displayed on the tablet. A ratio of <0.9 will indicate the presence of PAD.

The BlueDop device is a cuffless device which comprises an egg-shaped handheld probe component and an output monitor device. The device measures mean arterial blood pressure through an algorithm. Simply, it calculates the average blood pressure based on the normal rise and fall of pressure during each heartbeat. The device then automatically generates an ankle-brachial pressure index and a corresponding traffic-light classification for each lower-limb artery, based on waveform. This output is interpreted using table 2 below. Essentially an ABPI of 0.8-1.0 with a biphasic or triphasic waveform indicates no disease whereas an ABPI <0.8 and / or a monophasic/non-specific waveform indicates the presence of PAD.

Group 3 Post-bypass surveillance

Participants presenting for post-bypass surveillance

The MESI mTablet uses 3CUFFTM technology to detect pulse waveforms to assess ABPI. This involves placing a blood pressure cuff on all 4 limbs at the same time. The two arm cuffs then inflate and simultaneously measure the blood pressure in both brachial arteries. The cuff with the highest systolic pressure than reinflates with both the ankle cuffs simultaneously. The ABPI is then calculated and displayed on the tablet. A ratio of <0.9 will indicate the presence of PAD.

The BlueDop device is a cuffless device which comprises an egg-shaped handheld probe component and an output monitor device. The device measures mean arterial blood pressure through an algorithm. Simply, it calculates the average blood pressure based on the normal rise and fall of pressure during each heartbeat. The device then automatically generates an ankle-brachial pressure index and a corresponding traffic-light classification for each lower-limb artery, based on waveform. This output is interpreted using table 2 below. Essentially an ABPI of 0.8-1.0 with a biphasic or triphasic waveform indicates no disease whereas an ABPI <0.8 and / or a monophasic/non-specific waveform indicates the presence of PAD.

Was misst die Studie?

Primäre Ergebnismessungen

Ergebnis Maßnahme
Maßnahmenbeschreibung
Zeitfenster
Diagnostic Accuracy
Zeitfenster: From enrolment to the end of treatment (1 day)

Diagnostic accuracy assessed via sensitivity, specificity, positive predictor value (PPV) and negative predictor value (NPV).

From enrolment to the end of treatment (1 day)

Sekundäre Ergebnismessungen

Ergebnis Maßnahme
Maßnahmenbeschreibung
Zeitfenster
Validity assessed via correlation
Zeitfenster: Data collected at enrolment (1 day)

Diagnostic performance assessed via area under the receiver operating characteristic (AUROC) curve and the assessment time difference, assessed via measurement of the time taken to perform each automated ABPI assessment and the manual ABPI assessment.

Data collected at enrolment (1 day)
Diagnostic performance
Zeitfenster: Data collected at enrolment (1 day)

Assessed via area under the receiver operating characteristic (AUROC) curve.

Data collected at enrolment (1 day)
Time taken to perform each automated ABPI assessment and the manual ABPI assessment.
Zeitfenster: Data collected at enrolment (1 day)

Time taken to perform each assessment in seconds

Data collected at enrolment (1 day)
Qualitative Workstream - Assessment of usability and tolerability of automated devices.
Zeitfenster: Within the 2 year recruitment period

Semi structured interviews analysed using thematic analysis

Within the 2 year recruitment period
Visual Analogue Scale (VAS) score of 0-10
Zeitfenster: Data collected at point of enrolment (1 day)

VAS used to assess tolerability

Data collected at point of enrolment (1 day)

Mitarbeiter und Ermittler

Hier finden Sie Personen und Organisationen, die an dieser Studie beteiligt sind.

Sponsor

Studienaufzeichnungsdaten

Diese Daten verfolgen den Fortschritt der Übermittlung von Studienaufzeichnungen und zusammenfassenden Ergebnissen an ClinicalTrials.gov. Studienaufzeichnungen und gemeldete Ergebnisse werden von der National Library of Medicine (NLM) überprüft, um sicherzustellen, dass sie bestimmten Qualitätskontrollstandards entsprechen, bevor sie auf der öffentlichen Website veröffentlicht werden.

Haupttermine studieren

Studienbeginn (Tatsächlich)

24. Juni 2026

Primärer Abschluss (Geschätzt)

1. September 2028

Studienabschluss (Geschätzt)

1. September 2028

Studienanmeldedaten

Zuerst eingereicht

14. September 2026

Zuerst eingereicht, das die QC-Kriterien erfüllt hat

24. September 2026

Zuerst gepostet (Tatsächlich)

30. September 2026

Studienaufzeichnungsaktualisierungen

Letztes Update gepostet (Tatsächlich)

1. Oktober 2026

Letztes eingereichtes Update, das die QC-Kriterien erfüllt

30. September 2026

Zuletzt verifiziert

1. September 2026

Mehr Informationen

Begriffe im Zusammenhang mit dieser Studie

Andere Studien-ID-Nummern

  • R4364

Arzneimittel- und Geräteinformationen, Studienunterlagen

Studiert ein von der US-amerikanischen FDA reguliertes Arzneimittelprodukt

Nein

Studiert ein von der US-amerikanischen FDA reguliertes Geräteprodukt

Nein

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