ResNet18 using a 2D image-based representation achieved 98.5% accuracy, 97.9% specificity, and 98.8% sensitivity for PPG signal quality assessment in the presence of atrial fibrillation.
Does a 2D image-based deep learning approach improve the accuracy of PPG signal quality assessment in the presence of atrial fibrillation compared to traditional machine learning and 1D representations?
A 2D image-based deep learning approach using ResNet18 provides highly accurate PPG signal quality assessment in the presence of atrial fibrillation, potentially improving the yield of AF detection in wearable devices.
OBJECTIVE: Photoplethysmography (PPG) monitoring has been implemented in many portable and wearable devices we use daily for health and fitness tracking. Its simplicity and cost-effectiveness has enabled a variety of biomedical applications, such as continuous long-term monitoring of heart arrhythmias, fitness, and sleep tracking, and hydration monitoring. One major issue that can hinder PPG-based applications is movement artifacts, which can lead to false interpretations. In many implementations, noisy PPG signals are discarded. Misinterpreted or discarded PPG signals pose a problem in applications where the goal is to increase the yield of detecting physiological events, such as in the case of paroxysmal atrial fibrillation (AF)-a common episodic heart arrhythmia and a leading risk factor for stroke. In this work, we compared a traditional machine learning and deep learning approaches for PPG quality assessment in the presence of AF, in order to find the most robust method for PPG quality assessment. APPROACH: The training data set was composed of 78 278 30 s long PPG recordings from 3764 patients using bedside patient monitors. Two different representations of PPG signals were employed-a time-series based (1D) one and an image-based (2D) one. Trained models were tested on an independent set of 2683 30 s PPG signals from 13 stroke patients. MAIN RESULTS: ResNet18 showed a higher performance (0.985 accuracy, 0.979 specificity, and 0.988 sensitivity) than SVM and other deep learning approaches. 2D-based models were generally more accurate than 1D-based models. SIGNIFICANCE: 2D representation of PPG signal enhances the accuracy of PPG signal quality assessment.
Pereira et al. (Mon,) conducted a other in Atrial fibrillation (n=3,777). 2D image-based representation using ResNet18 vs. 1D time-series based representation and SVM was evaluated on PPG signal quality assessment accuracy. ResNet18 using a 2D image-based representation achieved 98.5% accuracy, 97.9% specificity, and 98.8% sensitivity for PPG signal quality assessment in the presence of atrial fibrillation.