Key result
Machine learning-based pulse wave analysis achieved a sensitivity of 86.8% and a specificity of 86.3% for the early detection of abdominal aortic aneurysms using simulated signals.
Why the study?
Abdominal aortic aneurysms are usually asymptomatic until rupture and mostly detected incidentally, making early detection critical to reducing mortality.
Does machine learning-based pulse wave analysis accurately detect abdominal aortic aneurysms in an in silico model?
Does machine learning-based pulse wave analysis accurately detect abdominal aortic aneurysms in an in silico model?
Machine learning-based pulse wave analysis of photoplethysmogram signals shows promise for early, non-invasive screening of abdominal aortic aneurysms.
Hypothesis-generating for photoplethysmogram-based AAA screening; requires prospective human validation before clinical consideration.
An abdominal aortic aneurysm (AAA) is usually asymptomatic until rupture, which is associated with extremely high mortality. Consequently, the early detection of AAAs is of paramount importance in reducing mortality; however, most AAAs are detected by medical imaging only incidentally. The aim of this study was to investigate the feasibility of machine learning-based pulse wave (PW) analysis for the early detection of AAAs using a database of in silico PWs. PWs in the large systemic arteries were simulated using one-dimensional blood flow modelling. A database of in silico PWs representative of subjects (aged 55, 65 and 75 years) with different AAA sizes was created by varying the AAA-related parameters with major impacts on PWs—identified by parameter sensitivity analysis—in an existing database of in silico PWs representative of subjects without AAAs. Then, a machine learning architecture for AAA detection was trained and tested using the new in silico PW database. The parameter sensitivity analysis revealed that the AAA maximum diameter and stiffness of the large systemic arteries were the dominant AAA-related biophysical properties considerably influencing the PWs. However, AAA detection by PW indexes was compromised by other non-AAA related cardiovascular parameters. The proposed machine learning model produced a sensitivity of 86.8 % and a specificity of 86.3 % in early detection of AAA from the photoplethysmogram PW signal measured in the digital artery with added random noise. The number of false positive and negative results increased with increasing age and decreasing AAA size, respectively. These findings suggest that machine learning-based PW analysis is a promising approach for AAA screening using PW signals acquired by wearable devices.
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Wang et al. (2021) studied Abdominal Aortic Aneurysms. Machine learning-based pulse wave analysis vs. Subjects without AAAs was evaluated on Early detection of AAA from photoplethysmogram PW signal. Machine learning-based pulse wave analysis achieved a sensitivity of 86.8% and a specificity of 86.3% for the early detection of abdominal aortic aneurysms using simulated signals.
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