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WatchBP Office ABI. Presenter: Willem Verberk Date: 22/04/2010 Lacer, Barcelona, Spain. Microlife www.microlife.com. Microlife WatchBP Office ABI. WatchBP Office ABI : vascular screening device. Ankle Brachial Index (ABI) Inter Arm Difference (IAD) Atrial Fibrilation screening (Afib). - PowerPoint PPT Presentation
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© 2008 All Rights Reserved. No copy and distribution without permission.
Microlife www.microlife.com
WatchBP Office ABI
Presenter: Willem VerberkDate: 22/04/2010 Lacer, Barcelona, Spain
© 2008 All Rights Reserved. No copy and distribution without permission.2
Microlife WatchBP Office ABI
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WatchBP Office ABI : vascular screening device
•Ankle Brachial Index (ABI)
• Inter Arm Difference (IAD)
•Atrial Fibrilation screening (Afib)
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WatchBP Office ABI Display
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Cuffs provided with WatchBP ABI
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ABI measurement
ABI= 148/136
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Ankle Brachial Index (ABI)
ABI value Interpretation
above 1.3 Abnormal Vessel hardening from PVD
1.0 - 1.3 Normal range
0.9 - 1.0 Acceptable
0.8 - 0.9 Some arterial disease
0.5 - 0.8 Moderate arterial disease
under 0.5 Severe arterial disease
ABI = BPankle
BParm
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Validation Procedure: Observers
• Two observers (A and B), assessed agreement in measuring SBP at the level of the brachial artery, the dorsalis pedis and the posterior tibial artery using a doppler device (5-10 MHz)
• All measurements of each individual participant were performed by the same observer (A or B, according to their availability).
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Validation procedure A
STEPS
NUMBER OF SEQUENTIAL
MEASUREMENTS
O FAMILIARIZATION PHASE
WatchBP Officerandom arm – leg simultaneous recording
1 ABI 1 BP reading
A ARM SELECTION
1 WatchBP Office Both arms simultaneous recordings*
3 BP readings
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Arm selection
IF IAD (consistently) >12 mmHg (Circulation 2006, ACC/AHA PDA guidelines) arm with higher BP is selected. Otherwise the right arm
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STEPS
NUMBER OF SEQUENTIAL
MEASUREMENTS
B Randomized order ( 1 vs 2) ABI MEASUREMENT
1 Doppler R brachial artery L brachial artery L posterior tibial artery L dorsalis pedis artery R posterior tibial artery R dorsalis pedis artery
2 legs ABI x 1 1 SBP reading 1 SBP reading 1 SBP reading 1 SBP reading 1 SBP reading 1 SBP reading
2 WatchBP OfficeSimultaneously R leg – R arm*Simultaneously L leg – R arm*
2 Legs ABI X 3 1 BP readings x 3 1 BP readings x 3
Validation procedure B
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Doppler measurements
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Artery compared
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WatchBP Office ABI Ankle Cuff
Posterior tibial artery
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Population
93 patientsoAge 62.5±11.1 yearsoMen 62%oHypertension 83%oDiabetes 45%oDyslipidemia 72%oSmoking 15%ocardiovascular disease 23%
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Results I WatchBP vs. Doppler
• 1st measurement 1.08±0.17 vs. 1.11±0.17
• Difference of Doppler vs. WatchBP•0.03 ± 0.11 (1st measurement)•0.02 ± 0.10 (average of 2 readings)•0.02±0.09 (average of 3 readings; p<0.01 for all).
• Correlation Doppler and WatchBP •0.80 (1st measurement )•0.84 (average of 2 readings)•0.86 (average of 3 readings; P < 0.001 for all)
• 95% Agreement diagnosing PAD (Doppler ABI <0.9)
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• WatchBP failed to measure ABI (5 sequential errors) in 3 legs. All with Doppler ABI <0.9.
• Erroneous WatchBP readings more frequent in patients with PAD (35.2%) than without (5.7%) respectively, p<0.001).
• The average time 3.8±0.3 vs. 8.8±2.2 min (p<0.001).
Results IIWatchBP vs. Doppler
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Conclusion Validation study
Automated ABI determination using Microlife WatchBP Office ABI is a quick, easy and reliable test for PAD detection
Abstract ESH Oslo 2010
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Doppler vs. WatchBP Office
Difficult (education / skills required)
easy
Time consuming Fast
Calculation needed Ratio is provided
Not simultaneous Simultaneous
Auscultatory Oscillometric
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