Model-driven Heart Rate Estimation and Heart Murmur Detection based on Phonocardiogram
It addresses cardiac monitoring for healthcare by improving accuracy in detecting murmurs and estimating heart rate, though it is incremental as it builds on existing methods with feature combinations and multi-task learning.
This study tackled heart rate estimation and murmur detection from phonocardiogram data, achieving a mean absolute error of 1.312 bpm for heart rate with a 2D CNN and over 95% accuracy for murmur detection using a multi-task learning model.
Acoustic signals are crucial for health monitoring, particularly heart sounds which provide essential data like heart rate and detect cardiac anomalies such as murmurs. This study utilizes a publicly available phonocardiogram (PCG) dataset to estimate heart rate using model-driven methods and extends the best-performing model to a multi-task learning (MTL) framework for simultaneous heart rate estimation and murmur detection. Heart rate estimates are derived using a sliding window technique on heart sound snippets, analyzed with a combination of acoustic features (Mel spectrogram, cepstral coefficients, power spectral density, root mean square energy). Our findings indicate that a 2D convolutional neural network (\textbf{\texttt{2dCNN}}) is most effective for heart rate estimation, achieving a mean absolute error (MAE) of 1.312 bpm. We systematically investigate the impact of different feature combinations and find that utilizing all four features yields the best results. The MTL model (\textbf{\texttt{2dCNN-MTL}}) achieves accuracy over 95% in murmur detection, surpassing existing models, while maintaining an MAE of 1.636 bpm in heart rate estimation, satisfying the requirements stated by Association for the Advancement of Medical Instrumentation (AAMI).