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

30 settembre 2026 aggiornato da: 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.

Panoramica dello studio

Stato

Reclutamento

Condizioni

Intervento / Trattamento

Tipo di studio

Osservativo

Iscrizione (Stimato)

400

Contatti e Sedi

Questa sezione fornisce i recapiti di coloro che conducono lo studio e informazioni su dove viene condotto lo studio.

Contatto studio

Backup dei contatti dello studio

Luoghi di studio

      • Hull, Regno Unito, HU3 2JZ
        • Reclutamento
        • Hull University Teaching Hospitals NHS Trust
        • Contatto:

Criteri di partecipazione

I ricercatori cercano persone che corrispondano a una certa descrizione, chiamata criteri di ammissibilità. Alcuni esempi di questi criteri sono le condizioni generali di salute di una persona o trattamenti precedenti.

Criteri di ammissibilità

Età idonea allo studio

18 anni e precedenti (Adulto, Adulto più anziano)

Accetta volontari sani

Sì

Sessi ammissibili allo studio

Tutto

Metodo di campionamento

Campione non probabilistico

Popolazione di studio

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

Descrizione

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

Piano di studio

Questa sezione fornisce i dettagli del piano di studio, compreso il modo in cui lo studio è progettato e ciò che lo studio sta misurando.

Come è strutturato lo studio?

Dettagli di progettazione

  • Modelli osservazionali: COHORT
  • Prospettive temporali: CROSS_SECTIONAL

Coorti e interventi

Gruppo / Coorte
Intervento / Trattamento
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.

Cosa sta misurando lo studio?

Misure di risultato primarie

Misura del risultato
Misura Descrizione
Lasso di tempo
Diagnostic Accuracy
Lasso di tempo: 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)

Misure di risultato secondarie

Misura del risultato
Misura Descrizione
Lasso di tempo
Validity assessed via correlation
Lasso di tempo: 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
Lasso di tempo: 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.
Lasso di tempo: 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.
Lasso di tempo: 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
Lasso di tempo: Data collected at point of enrolment (1 day)

VAS used to assess tolerability

Data collected at point of enrolment (1 day)

Collaboratori e investigatori

Qui è dove troverai le persone e le organizzazioni coinvolte in questo studio.

Sponsor

Studiare le date dei record

Queste date tengono traccia dell'avanzamento della registrazione dello studio e dell'invio dei risultati di sintesi a ClinicalTrials.gov. I record degli studi e i risultati riportati vengono esaminati dalla National Library of Medicine (NLM) per assicurarsi che soddisfino specifici standard di controllo della qualità prima di essere pubblicati sul sito Web pubblico.

Studia le date principali

Inizio studio (Effettivo)

24 giugno 2026

Completamento primario (Stimato)

1 settembre 2028

Completamento dello studio (Stimato)

1 settembre 2028

Date di iscrizione allo studio

Primo inviato

14 settembre 2026

Primo inviato che soddisfa i criteri di controllo qualità

24 settembre 2026

Primo Inserito (Effettivo)

30 settembre 2026

Aggiornamenti dei record di studio

Ultimo aggiornamento pubblicato (Effettivo)

1 ottobre 2026

Ultimo aggiornamento inviato che soddisfa i criteri QC

30 settembre 2026

Ultimo verificato

1 settembre 2026

Maggiori informazioni

Termini relativi a questo studio

Altri numeri di identificazione dello studio

  • R4364

Informazioni su farmaci e dispositivi, documenti di studio

Studia un prodotto farmaceutico regolamentato dalla FDA degli Stati Uniti

No

Studia un dispositivo regolamentato dalla FDA degli Stati Uniti

No

Queste informazioni sono state recuperate direttamente dal sito web clinicaltrials.gov senza alcuna modifica. In caso di richieste di modifica, rimozione o aggiornamento dei dettagli dello studio, contattare register@clinicaltrials.gov. Non appena verrà implementata una modifica su clinicaltrials.gov, questa verrà aggiornata automaticamente anche sul nostro sito web .