Evaluation of the outperforming algorithms for estimating systolic blood pressure (SBP) and diastolic blood pressure (DBP) after optimization.
- Recent developments in the growth of CNTs
- Methods to modify the surfaces of CNTs and decorate their surfaces for specific applications
- Applications of CNTs in biocomposites such as in orthopedic bone cement
- Application of CNTs as chemical sensors
- CNTs for fuelcells
- Health related issues when using CNTs
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Healthcare is one of the most crucial application areas that require faster development. In the wearable medical device domain, there is a lot of scope of research and development. With the recent technological development, wearable medical devices become feasible for real-time monitoring and diagnosis of medical problems. It has been accelerated with the availability of cheaper component and advancement in wireless communication technology, which has also enabled the application of the Internet of Things (IoT) in the wearable biomedical applications. According to a report by Grand View Research Inc. [1], the Internet of Things (IoT) penetration in the health sector is expected to reach a volume of approximately $ 409.9 billion by 2022. Thus, there is a huge boom in the wearable industry. There is a wide range of wearable devices that transmit medical information to mobile and web applications over the wireless network, enabling remote health monitoring. The wearable medical devices face the challenges of reliability, accuracy, precision, and robustness [2]. There are two important sub-sections for a complete wearable medical device—(i) hardware, which involves the sensor selection and characterization, noise removal from the acquired signals, and communication to the decision-making subsystem and (ii) software, which involves taking decisions based on the acquired signals. The second subsystem is where the machine learning comes into play, and the recent outburst of development in the field of machine learning has increased the possibility of remote monitoring and diagnosing with the acquired data from the wearable devices. The machine learning block of the wearable devices involves various steps such as preprocessing, feature selection, training on the labeled dataset, and testing to verify its accuracy and competency. The various parts of the machine learning block will be discussed in details later in this chapter. Thus, it is inevitable that machine learning methods that include algorithm training are required to enable the diagnosis of different diseases. Examples of success in machine learning lead researchers to the adoption of neural networks and other classifiers for medical diagnostic applications. However, this requires ground truth in the form of accurately curated data sources from carefully constructed subject trials with a properly distributed subject population of significant size. Limitations in ground truth data may lead to inaccurate results from the classifiers. This also includes a novel set of challenges for the design and execution of subject trials that are essential in the development and training of algorithms, as well as verification of system performance. Different open-source databases were used for hardware evaluation. The chapter is intended to provide a guidance to the researchers in computing for healthcare who wish to adopt the compelling mission of wearable device development for healthcare diagnostics.
\nThe chapter draws from the experience in the development of a series of biomedical devices from primary research done in the field of wearable devices for monitoring heart attack, abnormal heart sounds, gait analysis in diabetic foot monitoring, and blood pressure estimation using photoplethysmogram (PPG) signal. Therefore, in this chapter, four major health issues were discussed and how these issues can be well monitored without visiting hospital facilities were discussed. These experiments from various previously performed case studies by the team can help in providing a step-by-step roadmap on how to develop intelligent wearable biomedical system. Section 2 discusses the sensor selection and characterization process for a smart insole for gait analysis in diabetic foot monitoring. Section 3 discusses a case study, how continuous blood pressure can be estimated very accurately using PPG signal with the help of machine learning algorithm. Section 4 shows a wearable device for heart attack detection for the driver in a vehicle environment using classical machine learning approach, while Section 5 describes a wearable monitoring device, which is developed for heart sound monitoring to identify cardiovascular abnormality. Section 6 discusses the key contributions of the chapter along with the major results and their applications in real world. Finally, Section 7 concludes the chapter.
\nGait analysis is an important feature for diabetic foot monitoring. A force between the foot and ground, called the vertical ground reaction force (vGRF), can be acquired using different wearable sensors such as force sensors, strain gauges, magneto-resistive sensors, accelerometers, gyroscopes, and inclinometers or using different type of instruments such as force plate system and multi-camera-based system. Despite the improvements in technology, the cost of the multi-camera setup is high and it requires a long post-processing time. Furthermore, the number of strides that can be captured is limited, making it not applicable for personal use. Some efforts from different research groups have been made to overcome the limitations of traditional force plates by equipping treadmills with few force plates [3]. However, treadmills impose restrictions as subjects cannot change their direction of walking. Therefore, an increase in research interest was observed toward the development of smart insoles, where wearable sensors can be employed to detect vGRF, joint movements, acceleration of lower extremities, and other gait variables [4]. Smart insole provides the researchers with a flexible, portable, and comfortable solution for vGRF measurement. It includes different features including monitoring, processing, and displaying plantar pressure using pressure sensors embedded in the insole.
\n\nFigure 1 shows the complete block diagram of such a wearable system, where the pressure sensor array is placed in a customized shoe above the control circuit. Pressure data have to be digitized in the insole subsystem before it is send via a Bluetooth to a host computer for post-processing and analysis. This subsystem is powered by a battery alongside a power management unit. Pressure data can then be analyzed to extract various gait characteristics for different gait applications.
\nBlock diagram for a diabetic foot monitoring smart foot sole.
In this section, the design of smart soles to detect vGRF during gait, with two different types of low-cost commercial force sensor: FSRs and flexible piezoelectric sensors (Figure 2), is discussed. All the sensors can be calibrated, details of which can be found in [5], where a simple low-cost calibration method based on load cells has been shown to mitigate the need of expensive calibration devices or Motion Analysis Lab as a calibration reference.
\n(a) FSR sensor (Interlink Electronics) [6] and (b) piezoelectric sensor (Murata Manufacturing Co.) [7].
As shown in Figure 3, the most common places of foot plane where most of the pressure is exerted during gait are heal, metatarsal heads, hallux, and toe. These are the places where the calibrated sensors are to be placed on the smart insole.
\nSelected foot area for pressure acquiring (a) and array of pressure sensor (b).
In each insole, 16 sensors were positioned to record pressure values in different locations of the foot sole as shown in Figure 3b. Since people typically do not exert pressure on the Medial arch area, there is no sensor placed in this area [8]. Sixteen FSRs/piezoelectric sensors were used to collect data from smart insole, as can be seen in Figures 4 and 5. Sixteen inputs were multiplexed to one output through a 16-to-1 multiplexer, then applied to an ADC input of the microcontroller, and sent to host computer. The acquisition circuit was connected to the microcontroller module using an insulated ribble cable to minimize wire path and electrical hazard. The instrumented insole was placed on the top of the insole of the user’s shoe to acquire pressure data while the other end of the ribbon cable is connected to a small box with an adhesive strap to wrap around the leg. Real-time pressure data from different sensors were collected in the microcontroller and sent to a PC using Bluetooth low energy interface, and in the PC, a graphical interface was used to display and analyze the signal.
\nFSR-based smart insole: top (a) and bottom (b).
(a) Piezo insole with 16 piezo sensors and (b) additional insole layer placed on the top of piezo insole to ensure comfortability.
A commercial smart insole system called F-scan, which is one of the best insoles currently available in the market, was used to validate the performance of the designed smart insole (Figure 6a). The F-scan system is designed with very thin flexible printed circuit board with 960 sensing points, and each point can measure pressure with eight-bit resolution with a sampling frequency of maximum 750 Hz. However, the F-scan system is very expensive; the wired system costs around $13,000, while the wireless systems costs around $17,000. On the other hand, the proposed instrumented insole costs only ~500$. Typically the vGRF peak is only 10% of the subject’s weight. So, the data were calibrated based on the subject’s weight. The subject is supposed to stand on one foot for few seconds while wearing the smart insole, and the pressure is calculated for the purpose of calibration. If the subject’s weight is higher than the pressure measured, the calibration was done by a calibration factor greater than 1 while the calibration factor is less than 1 for patient’s weight less than the applied pressure. Calibration factor was calculated in the similar way for the FSR insole. Figure 6b and c show the application of F-scan and FSR-based system on the same subject while acquiring the vGRF signal.
\nCommercial F-scan smart insole (a), subject 01 is wearing the F-scan system (b), and FSR-based prototype system (c).
The FSR-based smart insole can acquire high-quality vGRF for different gait cycles, as seen in Figure 7, and it was found that the flexible piezoelectric sensors were performing poor in calibration due to their sensitivity to 3D forces requiring special force calibration machines to control the applied force in x, y, or z directions. Therefore, piezoelectric sensors cannot be utilized as a substitute for FSR in designing smart insole. However, the piezoelectric sensors if calibrated properly can be used to detect the starting and ending of each gait cycle.
\nComparison between the mean and standard deviation of vertical ground reaction forces (vGRFs) from left (blue) and right (orange) foot using F-scan system (a) and FSR-based system (b).
It is very important to monitor the blood pressure as high blood pressure puts a huge amount of strain on the arteries and the heart, resulting in increase in the probability of clogging of lumens. This clot (clogging of lumens) may cause several health problems such as heart attack, stroke, kidney diseases, and dementia. Thus, continuous blood pressure monitoring, at least four times daily at regular intervals, is preferable. Photoplethysmography (PPG) can be used for measuring the amount of light absorbed or reflected by blood vessels in the living tissue which can be extended to different aspects of cardiovascular surveillance including identification of blood oxygen saturation, heart rate, BP estimation, cardiac output, respiration, arterial aging, endothelial control, microvascular blood flow, and autonomic function. PPG waveforms generally have three distinct features—systolic peak, diastolic peak, and a notch in between—as shown in Figure 8.
\nA typical photoplethysmography (PPG) waveform with notch, systolic peak, and diastolic peak.
This section will discuss how the less cumbersome method of PPG signal acquisition can be used in estimating blood pressure, details of which can be found in [9]. This section will also discuss how a trained network using reliable labeled dataset can be used in such a study.
\nThe dataset used in this study was taken from Liang et al. [10], which is publicly available. The dataset contained 657 PPG signal samples from 219 subjects. PPG signals were first assessed to check the signal quality and then randomly divided into two sets. Then, 85% of the data were used for training and validation, and 15% of the data were used for testing the performance of the model. The PPG signals were preprocessed before they were sent for feature extraction. After extracting meaningful features, feature selection techniques were used to reduce computational complexity and the chance of over-fitting the algorithm. The features were then used to train machine learning algorithms. The best regression model was selected for SBP and DBP estimation individually. In the quality assurance process, 222 signals from 126 subjects were finally kept for this study. Figure 9 shows the sample PPG signal which was divided into fit and unfit for the study.
\nComparison of waveforms that are fit and unfit for the study. (a) Fit data and (b) unfit data.
To extract meaningful information from the signals, it was necessary to normalize all the signals. The Z-score technique was used to normalize the signals in this study to get amplitude-limited data. The normalized signal is passed into a low-pass Butterworth filter to remove the high frequency that is acquired by the signal.
\nThe PPG waveform is commonly contaminated with a baseline wandering due to respiration at frequencies ranging from 0.15 to 0.5 Hz. Therefore, it is very important that the signal is properly filtered to remove the baseline wandering but that important information is preserved as far as possible. A polynomial fit was used to find the trend in the signal and subtracted to get the baseline corrected signal, as shown in Figure 10. The next step is to extract features from the preprocessed signal.
\nBaseline correction of PPG waveform. (a) PPG waveform with the baseline wandering and fourth degree polynomial trend and (b) PPG waveform after detrending.
The block diagram summarizing the feature extraction details adopted in the study is shown in Figure 11. A PPG waveform contains many informative information such as systole, diastole, notch, pulse width, and peak-to-peak interval. Some of the distinctive features of the PPG waveform might not be dominant in some patients, such as the notch prevalence changing with age.
\nOverview of feature extraction.
Feature selection or reduction is important to reduce the risk of over-fitting the algorithms. In this section, three feature selection methods: correlation-based feature selection (CFS), ReliefF features selection, and features for classification using the minimum redundancy maximum relevance (fscmrmr) algorithm is discussed. ReliefF is a feature selection algorithm, which randomly selects instances and adjusts the weights of the respective element depending on the nearest neighbor. Correlation is a test used to evaluate whether or not a feature is highly correlated with the class or not highly correlated with any of the other features. On the other hand, the fscmrmr algorithm finds an optimal set of features that are mutually as dissimilar as possible and can effectively represent the response variable. The algorithm minimizes a feature set’s inconsistency and maximizes the relevance of a feature set to the answer variable. MATLAB built-in functions can be used for CFS, ReliefF, and fscmrmr feature selection algorithms.
\nAfter the features were extracted, the feature matrix was trained with machine learning algorithms. The Regression Learner App of MATLAB 2019b was used to estimate the BP. Five different algorithms [linear regression, regression trees, support vector regression (SVR), Gaussian process regression (GPR), and ensemble trees] with their variations to a total of 19 algorithms were trained using the 10-fold cross-validation. Out of all these algorithms, two best performing algorithms, Gaussian process regression and ensemble trees, were tested.
\nTo evaluate the performance of the ML algorithms for estimating BP, it is important to select proper metrics, i.e., four in this case and are stated below. Here, Xp is the predicted data while the ground truth data is X and n is the number of samples.
\nwhere \n
When using the Regression Learner App in MATLAB, the above criteria are automatically calculated by MATLAB and these values can be used to evaluate the performance of the algorithms.
\nIn Table 1, it can be noticed that the ReliefF feature selection algorithm produced the best result when combined with GPR. The feature selected using a combination of ReliefF and GPR performed the best in estimating SBP, while CFS and GPR performed best for DBP. Moreover, R scored 0.74 and 0.68 for SBP and DBP, respectively, which means that there is a strong correlation with the predictors and the ground truth.
\n\n | \n | Systolic blood pressure | \nDiastolic blood pressure | \n||
---|---|---|---|---|---|
Selection criteria | \nPerformance criteria | \nOptimized GPR | \nOptimized ensemble trees | \nOptimized GPR | \nOptimized ensemble trees | \n
Features from the literature | \nMAE | \n6.79 | \n12.43 | \n4.49 | \n8.17 | \n
MSE | \n180.99 | \n231.15 | \n70.06 | \n104.45 | \n|
RMSE | \n13.45 | \n15.20 | \n8.37 | \n10.27 | \n|
R | \n0.79 | \n0.73 | \n0.74 | \n0.57 | \n|
All features (newly designed and from the literature) | \nMAE | \n3.30 | \n10.886 | \n2.81 | \n7.96 | \n
MSE | \n72.95 | \n264.24 | \n30.70 | \n111.97 | \n|
RMSE | \n8.54 | \n16.25 | \n5.54 | \n10.58 | \n|
R | \n0.92 | \n0.67 | \n0.90 | \n0.56 | \n|
ReliefF | \nMAE | \n3.02 | \n11.32 | \n1.74 | \n5.99 | \n
MSE | \n45.49 | \n284.69 | \n12.89 | \n62.04 | \n|
RMSE | \n6.74 | \n16.84 | \n3.59 | \n7.88 | \n|
R | \n0.95 | \n0.65 | \n0.96 | \n0.78 | \n|
FSCMRMR | \nMAE | \n6.11 | \n14.65 | \n6.80 | \n8.22 | \n
MSE | \n108.96 | \n321.63 | \n77.26 | \n110.84 | \n|
RMSE | \n10.44 | \n17.93 | \n8.78 | \n10.53 | \n|
R | \n0.88 | \n0.58 | \n0.72 | \n0.56 | \n|
CFS | \nMAE | \n12.95 | \n16.27 | \n7.59 | \n7.89 | \n
MSE | \n361.96 | \n448.25 | \n108.43 | \n106.72 | \n|
RMSE | \n19.02 | \n21.17 | \n10.41 | \n10.33 | \n|
R | \n0.50 | \n0.28 | \n0.57 | \n0.58 | \n
Evaluation of the outperforming algorithms for estimating systolic blood pressure (SBP) and diastolic blood pressure (DBP) after optimization.
Myocardial infarction (MI), commonly known as heart attack, is considered one among the reasons of human death and disability worldwide. Although a heart attack is life threatening, it has early symptoms and signs that could be measured to help save many lives and to avoid consequences. There are three types of a heart attack: STEMI, NSTEMI, and coronary spasm, refer Figure 12.
\nComparison of the ST segment variations in a normal subject (a) and in MI patients with STEMI (b) and NSTEMI (c).
Several ECG ambulatory monitoring systems are available, but they require time and effort to acquire ECG signals from patients. Furthermore, the ECG data have to be sent to professionals for diagnostic analysis. A wearable ECG device can be a solution to acquire real-time ECG signals from the patient. Then, signals are interpreted using built-in algorithms to observe abnormality events of ECG signals and sudden heart attack. Therefore, proper action can be made.
\nIn terms of algorithm, some systems used linear classification and support vector machine (SVM). Some research studies have used the PhysioBank MI database to develop SVM-based real-time MI detection system with a classification accuracy of 90%. Another work came up with the solution for the motion artifact correction for the two-electrode ECG system with an optimized adaptive filter.
\nIn this section, a wearable heart attack detector and alarming system is discussed, which can be used to reduce road accidents that might result from the driver being precipitated by a heart attack, details of which are present in [11]. A portable wearable system that can continuously monitor the heart condition for any early symptoms could inform the patient to pull over the vehicle safely before losing consciousness to avoid potentially fatal consequences. Moreover, medical caregivers could arrive and provide the necessary medical procedures that rescue the consequences of a heart attack.
\nThe real-time heart attack monitoring wearable prototype system consists of two subsystems as shown in Figure 13. The subsystems communicate wirelessly using Bluetooth low energy (BLE) technology.
\nBlock diagram of the wearable heart attack detection prototype.
A wearable sensor subsystem is responsible for real-time ECG signal acquisition, amplification, filtering, digitization, and wireless transmission. The device is attached to a chest belt to be worn by a driver as shown in Figure 13. The device includes three dry electrodes (one electrode for reference and two electrodes for differential acquisition) connected to an analog front end (AFE) and an RFduino microcontroller with an embedded BLE module. Furthermore, the designed module incorporates several features to enhance the overall performance including lead-off detection, single-supply operation, adjustable gain control, rail-to-rail output, a three-pole adjustable low-pass filter (LPF), a two-pole adjustable high-pass filter (HPF), and an integrated right-leg drive (RLD). A notch filter in Wien bridge configuration was used to remove the line frequency (50 Hz) from the measured ECG signal. The acquired and preprocessed ECG signal was sent to the decision-making system using BLE.
\nThe intelligent heart attack detection and warning subsystems are trained using the Massachusetts Institute of Technology-Beth Israel Hospital (MIT-BIH) ST Change Database [12]. This subsystem consists of a single board computer, Raspberry Pi 3 (RPi3). The acquired ECG signal from RFduino is delivered to RPi3 over the Bluetooth low energy (BLE) interface. ECG data are buffered for 10 s, and the baseline drift is corrected, segmented to ECG beats (one ECG trace), and smoothened using a digital filter. Furthermore, the subsystem incorporates SIM 908 global system for mobile communications (GSM) and the global positioning system (GPS) module; the module is directly connected to RPi3 using a low power shield.
\nTwenty-two different machine learning (ML) algorithms were trained for real-time ECG classification. Experiments were done in two stages. In the first stage, the public labeled database “MIT-BIH ST Change Database” covers both normal and abnormal subjects. Twenty-eight subjects’ ECG recordings with 14 subjects’ ECG recordings were normal, seven patients had T-inversion, and the other patients experienced long-term recordings that showed ST elevation and depression. The system was tested on normal subjects, and an ECG simulator was used to simulate abnormal ST-elevated MI situations to test the performance of the complete system in real time.
\nDue to body movements, even respiration, muscle signal, and power line interference of 50 Hz, filtering stage was essential to filter the signal and eliminate the inherent noises. In addition, ECG was often affected by artifacts constituted through electrodes or the interference of the signal processing hardware. Finite impulse response filter (FIR) based on window method was used to smooth the noisy signal by slicing the array of data into selected length windows, computing averages of the data within that range, and maintaining the process throughout the dataset using the moving-average filter.
\nBaseline wander correction technique and continuous wavelet transformation were used for synthesizing the ECG signal; the wavelet was able to show how the frequency component varied within certain ranges of time. The ECG signals were segmented into traces. A total of 3500 ECG traces over 28 different subjects were considered. Therefore, the total number of ECG traces considered in this study was 10,500.
\nDifferent features were investigated from time, frequency, and time-frequency domains. Table 2 shows the t-domain, the f-domain, and the (t, f) domain features extracted.
\nTime domain features | \nFrequency domain features | \nTime-frequency domain features | \n
---|---|---|
\n
| \n\n
| \n\n
| \n
Features extracted from the ECG traces.
A five-fold cross-validation technique was used in the testing and training process. Weighted performance matrix was created by averaging the results of all the iterations. The averages of all scoring matrices were calculated for the four iterations along with their standard deviation. Performance evaluations of three different time-frequency distributions (TFDs) were calculated to identify which TFD produced higher accuracy. In addition, the receiver operating characteristic (ROC) analysis was used to evaluate the performance of the ML algorithm for classification confusion matrix and several standard statistical evaluation parameters were used to evaluate the performance of the algorithms including sensitivity, false positive rate (FPR), F1 score, and accuracy.
\nAll the features listed in Table 2 were extracted to evaluate the performance of each feature. AUC were calculated as shown in Table 3. All features that scored a minimum of 0.5 and above were useful to apply to the classifiers. It was noticed that all the selected features fulfilled the requirement for all of the distributions. Hence, all the features were used for training, validation, and testing. A five-fold cross-validation was used to compute the ML algorithms validation accuracy. Tables 4 and 5 demonstrate the accuracies resulting from classifying ST elevation and T-wave inversion for the three different (t, f) distributions. Also, both tables showed the two best performing algorithms, the support vector machine (SVM) and the k-nearest neighbors (KNNs). It was noticed that SVM outperformed KNN for the extended modified B distribution.
\nFeatures | \nWVD | \nSPEC | \nEMBD | \n|||
---|---|---|---|---|---|---|
\n | Original | \nJoint (t, f) | \nOriginal | \nJoint (t, f) | \nOriginal | \nJoint (t, f) | \n
Mean | \n0.53 | \n0.67 | \n0.53 | \n0.75 | \n0.53 | \n0.75 | \n
Variance | \n0.51 | \n0.71 | \n0.51 | \n0.66 | \n0.51 | \n0.58 | \n
Skewness | \n0.68 | \n0.57 | \n0.68 | \n0.67 | \n0.68 | \n0.57 | \n
Kurtosis | \n0.75 | \n0.57 | \n0.75 | \n0.69 | \n0.75 | \n0.56 | \n
Coefficient of variation | \n0.50 | \n0.74 | \n0.50 | \n0.65 | \n0.50 | \n0.58 | \n
Spectral flux | \n0.76 | \n0.82 | \n0.76 | \n0.83 | \n0.76 | \n0.55 | \n
Spectral flatness | \n0.54 | \n0.71 | \n0.54 | \n0.79 | \n0.54 | \n0.68 | \n
Spectral entropy | \n0.81 | \n0.71 | \n0.81 | \n0.65 | \n0.81 | \n0.59 | \n
Results of the ROC analysis of the t-domain, f-domain, and (t, f) domain features for the ST elevation detection.
Parameters/ML algorithms | \nWVD | \nSPEC | \nEMBD | \n|||
---|---|---|---|---|---|---|
\n | SVM | \nKNN | \nSVM | \nKNN | \nSVM | \nKNN | \n
Recall (TPR) (%) | \n92 | \n89 | \n89 | \n90 | \n99.1 | \n96.7 | \n
FPR (%) | \n11 | \n12 | \n14 | \n13 | \n1.7 | \n3.8 | \n
Precision (%) | \n89 | \n88 | \n86 | \n87 | \n98.3 | \n96.2 | \n
F score (%) | \n90.5 | \n88.9 | \n87.5 | \n86 | \n98.7 | \n97 | \n
Accuracy (%) | \n87.1 | \n86.4 | \n85.3 | \n84.2 | \n97.4 | \n95.9 | \n
Evaluation parameters in classifying ST elevation.
Parameters/ML algorithms | \nWVD | \nSPEC | \nEMBD | \n|||
---|---|---|---|---|---|---|
SVM | \nKNN | \nSVM | \nKNN | \nSVM | \nKNN | \n|
Recall (TPR) (%) | \n86 | \n84 | \n83 | \n84 | \n98.5 | \n96.9 | \n
FPR (%) | \n19 | \n20 | \n22 | \n21 | \n1.3 | \n4.3 | \n
Precision (%) | \n81 | \n80 | \n78 | \n79 | \n97.8 | \n95.7 | \n
F score (%) | \n83.4 | \n82.7 | \n75.9 | \n76.2 | \n98.2 | \n96.6 | \n
Accuracy (%) | \n78 | \n76.3*\n | \n72.1 | \n74 | \n96.3 | \n95.1 | \n
Evaluation parameters in classifying T-wave inversion.
As shown from Tables 4 and 5, EMBD outperformed the others in classifying ST elevation and T-wave inversion. Moreover, the variance showed that the variation for different iterations was at the minimum for the EMBD distribution (Table 3). Thus, EMBD distribution was more robust to noisy data. EMBD distributions were implemented for real-time classification using Python. The results showed that both the recall and the precision were reasonable for reliable detection, and for both positive and negative classifications. This can be observed in the F score as well.
\nDifferent methods can be used to detect cardiovascular diseases (CVD) including electrocardiogram (ECG), magnetic resonance imaging (MRI), and echocardiogram (echo). ECG is considered the most popular method because it provides an inexpensive, non-invasive, and intuitive method for heart diagnosis. However, it has a limitation when it comes to detecting structural abnormalities and defects in heart valves due to heart murmurs [13]. The previously mentioned technologies for diagnosing cardiovascular diseases could be unaffordable by the majority of the people in low-income countries to detect the CVD in advance [14, 15, 16]. Heart sound (HS) has been one of the most primitive and popular methods of detecting early cardiac illnesses with the help of abnormal heart sounds. Phonocardiogram (PCG), also known as heart sound (HS), is a graphical representation of the HS recording signals using an equipment called as phonocardiograph [17, 18]. There are three major limitations of the auscultation of the heart: first, the recorded sounds have very low amplitude which will require the device to be extremely sensitive. Second, the low-amplitude HS signal can be easily corrupted by noise leading to a faulty diagnosis. Finally, the reliability of the auscultation technique mainly depends on the skill, expertise, and capability of hearing of the doctor. Machine learning could be a solution to this problem.
\nThe heart produces HS due to the closure of heart valves that produces the normal heart sounds. Mitral and tricuspid valve closure produces the first heart sound (“S1”), and aortic and pulmonic valve closure produces the second heart sound (“S2”) (Figure 14). There is no heart sound observed for normal opening of heart valve. Moreover, the flow of blood from one structure inside heart to another typically does not produce any sound. Abnormal heart sounds are caused due to the problems in heart valves or muscles or both. The third HS (S3) (Figure 14) is normally caused by a sudden reduction of blood supply from the left atrium to the ventricle, which is normal for children and adults (35–40 years). However, in other age groups and especially in the people above 40 years, it is abnormal [19]. The failure of heart in the diastolic period can be linked to the fourth heart sound as illustrated in Figure 13. Heart sounds can be categorized in terms of frequency as they differ from each other in frequency. The frequency of S1 is smaller than S2. The low-amplitude abnormal heart sounds S3, and S4 typically occurs 0.1–0.2 s after S2 and about 0.07–0.1 s before S1 respectively [19]. S1 and S2 sounds are high-amplitude signals and well identified by the diaphragm of the stethoscope. The frequency ranges of S1 and S2 are 50–60 and 80–90 Hz, respectively [19]. S3 is a low-amplitude signal with a bandwidth of 20–30 Hz [19]. S4 typically occurs at the end of diastole and can be identified easily by stethoscope, and the frequency is below 20 Hz [19]. A detailed review and state-of-the-art techniques of HS processing and classification are discussed in [20, 21, 22]. The abnormal characteristics of the HS signal were stated in [23], while the different signal processing techniques involved in the HS signal analysis are discussed in [24]. In [25], recent works related to feature selection and classification were discussed.
\nDifferent heart sounds.
The proposed system consists of two subsystems: the two systems communicate wirelessly via BLE technology as shown in Figure 15, details of which are found in [26, 27]. The sensor subsystem consists of the acoustic sensor that acquires the heart sound signal and feeds to analog front end. A custom sensor was designed and implemented on a traditional stethoscope chest piece to amplify the heart sound waveform. The sensor bandwidth is 20–600 Hz to perform the conversion of the heart sound to electrical signal; the microphone was placed in the rubber tube very close to the chest piece as shown in Figure 16. The signal is then pre-amplified and filtered. After that, the signal is converted by ADC in the RFduino microcontroller and transmitted wirelessly into an intelligent detection subsystem that consists of personal computer (PC) where the signal will be processed and classified using MATLAB.
\nSystem overall with modified stethoscope chest.
Blocks of the machine learning-based abnormality detection algorithm.
In this system, a dataset from PhysioNet challenge 2016 was utilized, which includes 3126 heart sound recordings divided into five databases (A through E); each record lasted from 5 s to just over 120 s. These HS data were recorded from clinical and nonclinical environment from both healthy and pathological patients (e.g., children and adults) from four different locations—aortic, pulmonic, tricuspid, and mitral areas. The dataset includes normal and abnormal recordings with a higher number of normal than abnormal readings.
\nThe brain of the whole system is the intelligent abnormal heart sound and warning subsystem. It is comprised of three modules: data acquisition and logging, Bluetooth module, and classification. This subsystem acquires real-time HS signals and detects the abnormality of the signal using trained ML algorithm. Normal and abnormal heart sound data from a public database were used for training and testing of the machine learning algorithm in the MATLAB environment. The best performing algorithm was identified and ported in Python 3.5 to be used as a real-time classifier in the testing phase. The detailed block diagram of the machine learning approach can be seen in Figure 16.
\nThe HS data were preprocessed and segmented into training and testing data. The algorithm to classify MI, the support vector machine (SVM) algorithm, was implemented initially using MATLAB 2018a and later on using Python 3.5 in personal computer (PC) platform for real-time classification. Signal preprocessing was accomplished using the signal processing toolbox, and training and classification were done by Statistics and Machine Learning Toolbox in the MATLAB and using Numpy (v1.13.3), Matplotlib (v3.0.2), PyBrain (v0.31), and Scikit learn (v0.20) libraries in Python.
\nIn the preprocessing, a sixth-order bandpass IIR filter with lower 3-dB frequency of 20 Hz, higher 3-dB frequency of 600 Hz, and the sample rate of 2000 Hz was used to remove any high or low noise. After filtering, the signal is segmented. Segmentation of the PCG signals into heart cycles and marking of cycle starting instances are very important to generate the epoch of interest for the machine learning.
\nAn automatic code was used to identify the S1 peaks of the PCG signal. One complete cycle of PCG signal is from one S1 peak to another S1 peak. This was segmented along with a time offset to capture the beginning of S1 and the ending of S2 as shown in Figure 17. In this study, MIT-BIH benchmark dataset was used and randomly partitioned into two subsets. The first set is for training and validation (80% of data), and the second set is for testing (20% of data). The ML models were trained to classify a two-class problem (normal and abnormal). For evaluation, confusion matrix and standard statistical evaluation parameters for each algorithm were calculated for each fold. After five-fold cross-validation, these parameters were used to evaluate the performance of the algorithms.
\nNormal and abnormal HS: (a and d) detection of peaks; (b and e) overlaid segments; (c and f) average of the segments.
For feature extraction, 27 features encompassing t-domain, f-domain, and mel-frequency cepstral coefficient (MFCC) features were extracted for each heart sound cycle. The t-domain features were mean, median, standard deviation, signal twenty-fifth percentile, signal seventy-fifth percentile, signal interquartile range, mean absolute deviation, skewness, kurtosis, and Shannon’s entropy, while the f-domain features were spectral entropy, signal magnitude at maximum frequency, the maximum frequency in the power spectrum, and ratio of signal energy between the maximum frequency range and the overall signal. Other features were mel-frequency cepstral features.
\nNeighborhood component analysis (NCA) is a non-parametric and embedded method for selecting features to provide maximum prediction accuracy of classification algorithms. NCA with built-in functions in Statistics and Machine Learning Toolbox™ of MATLAB was used. It can be noted that 15 features were the most important features out of the 27 features, which were kurtosis, maximum frequency value, and all the MFCC features. In addition, the parameters for the trained model were tuned to optimize their hyperparameters. The best performing algorithms were optimized to calculate the performance measures. Statistical measures were then calculated for the testing dataset (20% of the whole database).
\nTwenty-two different algorithms [three decision trees, two discriminant analyses, six support vector machines (SVMs), six k-nearest neighbors (KNNs), and five ensemble classifiers] were trained for the testing dataset with 27 features. The validation accuracy and their corresponding performance measures are listed in Table 6.
\nItems | \nFine KNN | \nWeighted KNN | \nEnsemble subspace discriminant | \n
---|---|---|---|
Accuracy (%) | \n94.63 | \n93.72 | \n93.17 | \n
Accuracy: abnormal (%) | \n88, 12 | \n85, 15 | \n87, 13 | \n
Accuracy: normal (%) | \n96.6, 3.4 | \n97, 3 | \n95, 5 | \n
Error (%) | \n5.37 | \n6.28 | \n6.83 | \n
Sensitivity (%) | \n96.32 | \n95.24 | \n95.67 | \n
Specificity (%) | \n89.34 | \n88.72 | \n85.49 | \n
Precision (%) | \n96.62 | \n96.54 | \n95.29 | \n
FPR (%) | \n10.66 | \n11.28 | \n14.51 | \n
F1 score (%) | \n96.46 | \n95.88 | \n95.48 | \n
MCC (%) | \n85.34 | \n82.7 | \n81.5 | \n
Performance measures of three best performing algorithms for full-feature set.
It is obvious from the above table that the best validation accuracy was observed for “Fine Tree” classifier. Moreover, the accuracy of classifying normal is higher than abnormal and this is because of the imbalanced dataset. Therefore, to reduce the potential over-fitting of the features, a reduction in the number of features used in the training process. The training dataset was re-trained with the reduced number of features (15), and all evaluation parameters were calculated. Table 7 summarizes the evaluation measures for identifying the best algorithm with feature selection.
\nItems | \nFine KNN | \nWeighted KNN | \nEnsemble subspace discriminant | \n
---|---|---|---|
Accuracy (%) | \n92.36 | \n92.02 | \n92.89 | \n
Accuracy: abnormal (%) | \n84, 16 | \n82, 18 | \n83, 17 | \n
Accuracy: normal (%) | \n95, 5 | \n95, 5 | \n96, 4 | \n
Error (%) | \n7.64 | \n7.98 | \n7.11 | \n
Sensitivity (%) | \n94.85 | \n94.30 | \n94.77 | \n
Specificity (%) | \n84.52 | \n84.62 | \n86.71 | \n
Precision (%) | \n95.08 | \n95.22 | \n95.90 | \n
FPR (%) | \n15.48 | \n15.38 | \n13.29 | \n
F1 score (%) | \n94.96 | \n94.76 | \n95.33 | \n
MCC (%) | \n79.17 | \n78.09 | \n80.42 | \n
Performance matrix for the three best performing algorithms on reduced feature set.
From Table 6, the overall accuracy was reduced as well as classifying normal and abnormal both were also reduced even though the same algorithms were performing best in the classification after feature reduction. Therefore, it can be said that the features used for classification are optimized and cannot be reduced.
\nTo improve the performance of the best performing algorithms by optimizing the hyperparameters of the algorithms, it was observed that the performance of the ensemble algorithm can be improved. Two important parameters were optimized for the ensemble algorithms: “Distance” and “Number of neighbors.”
\nThis chapter summarizes the findings of four different applications of wearable devices to tackle four critical clinical problems. The smart wearable devices reported here can help patients in different settings to manage their diseases, which will reduce frequent hospital visit requirement and can elevate their living standard. The summary of the results from each of the case study can be provided as below.
\nThe FSR-based smart insole can acquire high-quality vGRF for different gait cycles, and it was found that the flexible piezoelectric sensors were performing poor in calibration due to their sensitivity to 3D forces requiring special force calibration machines to control the applied force in x, y, or z directions. Therefore, piezoelectric sensors cannot be utilized as a substitute for FSR in smart insole application.
\nReliefF feature selection algorithm produced the best result when combined with Gaussian process regression (GPR) for predicting the systolic and diastolic blood pressure using PPG signal. The feature selected using a combination of ReliefF and GPR performed the best in estimating SBP, while correlation-based feature selection (CFS) and GPR performed best for DBP. It can be noted that this optimized approach can estimate SBP and DBP with the RMSE of 6.74 and 3.57, respectively.
\nExtended modified B distribution shows the best performance in classifying ST elevation and T-wave inversion in the heart attack detection case study using ECG signals. The variance of the results from EMBD technique showed that the variation for different iterations was at the minimum for the EMBD distribution (Table 3). Thus, EMBD distribution was more robust in heart attack detection in case of noisy ECG data.
\nHeart sound signals can be accurately classified using “Fine Tree” classifier compared with 22 different algorithms [three decision trees, two discriminant analyses, six support vector machines (SVMs), six k-nearest neighbors (KNNs), and five ensemble classifiers]. Feature reduction technique did not help in improving the performance. It was observed that the best performing algorithms can be improved further by optimizing the hyperparameters of the algorithms.
\nThe chapter discusses in detail with case studies about the different opportunities available in the design and development of wearable medical devices, which can help in real-time healthcare monitoring. The chapter has not only discussed on the study of characterizing sensors for specific wearable device but also how reliable dataset can be utilized to develop trained model for medical diagnosis. It has also shown how to design and develop a complete wearable device with real-time monitoring and alarming in case of emergency. These smart wearable solutions, if properly designed and deployed, can help millions of users to take advantages of the wearable technologies and thereby can monitor their health status in different setting.
\nThis work was made possible by NPRP12S-0227-190164 from the Qatar National Research Fund, a member of Qatar Foundation, Doha, Qatar. The statements made herein are solely the responsibility of the authors.
\nThe authors declare no conflict of interest.
General requirements for Open Access to Horizon 2020 research project outputs are found within Guidelines on Open Access to Scientific Publication and Research Data in Horizon 2020. The guidelines, in their simplest form, state that if you are a Horizon 2020 recipient, you must ensure open access to your scientific publications by enabling them to be downloaded, printed and read online. Additionally, said publications must be peer reviewed.
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