Key result
The combination of ECG and PPG signals provides complementary features such as pulse transit time and heart rate variability that improve diagnostic performance in healthcare applications like cuffless blood pressure estimation and hypertension detection.
Why the study?
This survey aims to increase interest in combining ECG and PPG signals across more healthcare applications to achieve optimal measurements of cardiac activity.
Combining ECG and PPG signals provides valuable features for various healthcare applications, particularly continuous cuffless blood pressure monitoring.
Most health care systems use various physiological signals to provide an accurate diagnosis performance. The main common signals functional in health care applications are the electrocardiogram (ECG) and photoplethysmogram (PPG). ECG signal represents the electrical cardiac activity of the heart, while the PPG signal measures the changes in the blood volume. There are several applications in which the ECG combined with PPG can be used in the field of medical health care. This survey illustrates the various applications that combine features from the ECG and PPG signals. The review manifests the techniques, methodologies used in the data acquisition, pre-processing of the signals. The feature extraction and classification phases for both ECG and PPG are explained. The limitations, challenges, and future directions for the combined application of ECG and PPG are clarified to solve the medical problems that existed, presented, and feasible. This study aims to increase the interest in applying the combination between ECG and PPG signals in more applications and to obtain optimal measurements related to cardiac activity.
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Bassiouni et al. (2021) conducted a review in Various (hypertension, epilepsy, cuffless blood pressure). Combination of ECG and PPG signals was evaluated. The combination of ECG and PPG signals provides complementary features such as pulse transit time and heart rate variability that improve diagnostic performance in healthcare applications like cuffless blood pressure estimation and hypertension detection.
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