Cuffless blood pressure estimation from electrocardiogram and photoplethysmogram using waveform based ANN-LSTM network

• Published in: Biomedical signal processing and control Vol. 51; pp. 382 - 392
• Main Authors: Tanveer, Md. Sayed, Hasan, Md. Kamrul
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.05.2019
• Subjects: Artificial neural network – long short term memory (ANN-LSTM); Continuous blood pressure; Electrocardiography (ECG); Photoplethysmography (PPG); Wearable biomedical computing; Artificial neural network – long short term memory (ANN-LSTM); Electrocardiography (ECG); Wearable biomedical computing; Continuous blood pressure; Photoplethysmography (PPG)
• ISSN: 1746-8094; 1746-8108
• DOI: 10.1016/j.bspc.2019.02.028

•A continuous and non-invasive method of blood pressure estimation from ECG and PPG signals is proposed.•A novel ANN-LSTM hierarchical neural network is proposed for continuous monitoring of BP.•The obtained results satisfy both AAMI and BHS standards of non- invasive continuous BP measurement.•The proposed technique has achieved a benchmark result on a standard 39-subject datasets. Although photoplethysmogram (PPG) and electrocardiogram (ECG) signals can be used to estimate blood pressure (BP) by extracting various features, the changes in morphological contours of both PPG and ECG signals due to various diseases of circulatory system and interaction of other physiological systems make the extraction of such features very difficult. In this work, we propose a waveform-based hierarchical Artificial Neural Network – Long Short Term Memory (ANN-LSTM) model for BP estimation. The model consists of two hierarchy levels, where the lower hierarchy level uses ANNs to extract necessary morphological features from ECG and PPG waveforms and the upper hierarchy level uses LSTM layers to account for the time domain variation of the features extracted by the lower hierarchy level. The proposed model is evaluated on 39 subjects using the Association for the Advancement of Medical Instrumentations (AAMI) standard and the British Hypertension Society (BHS) standard. The method satisfies both the standards in the estimation of systolic blood pressure (SBP) and diastolic blood pressure (DBP). For the proposed network, the mean absolute error (MAE) and the root mean square error (RMSE) for SBP estimation are 1.10 and 1.56 mmHg, respectively, and for DBP estimation are 0.58 and 0.85 mmHg, respectively. The performance of the proposed hierarchical ANN-LSTM model is found to be better than the other feature engineering-based networks. It is shown that the proposed model is able to automatically extract the necessary features and their time domain variations to estimate BP reliably in a noninvasive continuous manner. The method is expected to greatly facilitate the presently available mobile health-care gadgets in cuffless continuous BP estimation.