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

30. září 2026 aktualizováno: 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.

Přehled studie

Postavení

Nábor

Podmínky

Intervence / Léčba

Typ studie

Pozorovací

Zápis (Odhadovaný)

400

Kontakty a umístění

Tato část poskytuje kontaktní údaje pro ty, kteří studii provádějí, a informace o tom, kde se tato studie provádí.

Studijní kontakt

Studijní záloha kontaktů

Studijní místa

Kritéria účasti

Výzkumníci hledají lidi, kteří odpovídají určitému popisu, kterému se říká kritéria způsobilosti. Některé příklady těchto kritérií jsou celkový zdravotní stav osoby nebo předchozí léčba.

Kritéria způsobilosti

Věk způsobilý ke studiu

18 let a starší (Dospělý, Starší dospělý)

Přijímá zdravé dobrovolníky

Ano

Pohlaví způsobilá ke studiu

Všechno

Metoda odběru vzorků

Vzorek nepravděpodobnosti

Studijní populace

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

Popis

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

Studijní plán

Tato část poskytuje podrobnosti o studijním plánu, včetně toho, jak je studie navržena a co studie měří.

Jak je studie koncipována?

Detaily designu

  • Observační modely: COHORT
  • Časové perspektivy: CROSS_SECTIONAL

Kohorty a intervence

Skupina / kohorta
Intervence / Léčba
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.

Co je měření studie?

Primární výstupní opatření

Měření výsledku
Popis opatření
Časové okno
Diagnostic Accuracy
Časové okno: 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)

Sekundární výstupní opatření

Měření výsledku
Popis opatření
Časové okno
Validity assessed via correlation
Časové okno: 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
Časové okno: 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.
Časové okno: 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.
Časové okno: 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
Časové okno: Data collected at point of enrolment (1 day)

VAS used to assess tolerability

Data collected at point of enrolment (1 day)

Spolupracovníci a vyšetřovatelé

Zde najdete lidi a organizace zapojené do této studie.

Sponzor

Termíny studijních záznamů

Tato data sledují průběh záznamů studie a předkládání souhrnných výsledků na ClinicalTrials.gov. Záznamy ze studií a hlášené výsledky jsou před zveřejněním na veřejné webové stránce přezkoumány Národní lékařskou knihovnou (NLM), aby se ujistily, že splňují specifické standardy kontroly kvality.

Hlavní termíny studia

Začátek studia (Aktuální)

24. června 2026

Primární dokončení (Odhadovaný)

1. září 2028

Dokončení studie (Odhadovaný)

1. září 2028

Termíny zápisu do studia

První předloženo

14. září 2026

První předloženo, které splnilo kritéria kontroly kvality

24. září 2026

První zveřejněno (Aktuální)

30. září 2026

Aktualizace studijních záznamů

Poslední zveřejněná aktualizace (Aktuální)

1. října 2026

Odeslaná poslední aktualizace, která splnila kritéria kontroly kvality

30. září 2026

Naposledy ověřeno

1. září 2026

Více informací

Termíny související s touto studií

Další identifikační čísla studie

  • R4364

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