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Doppler Optical Coherence Tomography of Retinal Circulation
Published on: September 18, 2012
Comparison between oscillometric- and Doppler-ABI in elderly individuals.
Ikuno Takahashi1, Kyoji Furukawa, Waka Ohishi
1Department of Clinical Studies, Radiation Effects Research Foundation (RERF), Minami-ku, Hiroshima, Japan. iktakaha@rerf.or.jp
Vascular Health and Risk Management
|March 16, 2013
Summary
Automated oscillometric ankle-brachial index (ABI) measurement offers a simpler, faster alternative to Doppler ultrasound for detecting peripheral arterial disease (PAD) in the elderly. This method provides more accurate prevalence estimations in this population.
Area of Science:
- Vascular Medicine
- Diagnostic Imaging
- Geriatrics
Background:
- Peripheral arterial disease (PAD) is often under-recognized due to complex diagnostic techniques.
- The ankle-brachial index (ABI) is a key indicator for PAD, but its measurement can be challenging.
- Conventional Doppler ultrasound requires specialized skills for accurate ABI assessment.
Purpose of the Study:
- To evaluate the efficacy of automated oscillometric ABI measurement using the VP-2000 device.
- To compare oscillometric ABI measurement with the standard Doppler ultrasound method.
- To assess the accuracy and reliability of oscillometric ABI in an elderly cohort.
Main Methods:
- A cohort of 113 elderly subjects (age 61-88 years) was studied.
- Ankle-brachial index (ABI) was measured using both automated oscillometric (VP-2000) and conventional continuous-wave Doppler ultrasound methods.
- Statistical analysis was performed to compare measurements, assess correlations, and evaluate agreement (Cohen's Kappa).
Main Results:
- The oscillometric method demonstrated a statistically smaller standard deviation in ABI measurements compared to the Doppler method.
- Correlations between methods were moderate (0.46 left leg, 0.61 right leg), potentially influenced by interobserver variation in Doppler measurements.
- Differences were more pronounced at lower ABI ranges, suggesting Doppler's higher sensitivity (50%) but lower specificity (100%) for PAD detection in this context.
Conclusions:
- Automated oscillometric ABI measurement offers a more precise estimation of PAD prevalence in the elderly compared to the conventional Doppler method.
- While Doppler showed higher sensitivity at lower ABIs, the overall agreement (Cohen's Kappa = 0.65) indicates good concordance.
- Oscillometric devices present a viable, simpler alternative for widespread PAD screening in geriatric populations.
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