Heart Arrhythmia Classification

Overview

Heart-Arrhythmia-Classification



Instructions to run

  1. Note down the location of the ".edf" file and enter it into the EDF_PATH variable
  2. Run the predict.py file to get the output


Dataset

The original datasets used are the MIT-BIH Arrhythmia Dataset and that are preprocessed based on the methodology described in the paper below in order to end up with samples of a single heartbeat each and normalized amplitudes.

Kachuee, M., Fazeli, S., & Sarrafzadeh, M. (2018). ECG Heartbeat Classification: A Deep Transferable Representation. 2018 IEEE International Conference on Healthcare Informatics (ICHI). https://doi.org/10.1109/ichi.2018.00092 (https://arxiv.org/pdf/1805.00794.pdf)


The process followed is:

  1. Splitting the continuous ECG signal to 10s windows and select a 10s window from an ECG signal.
  2. Normalizing the amplitude values to the range of between zero and one.
  3. Finding the set of all local maximums based on zerocrossings of the first derivative.
  4. Finding the set of ECG R-peak candidates by applying a threshold of 0.9 on the normalized value of the local maximums.
  5. Finding the median of R-R time intervals as the nominal heartbeat period of that window (T).
  6. For each R-peak, selecting a signal part with the length equal to 1.2T.
  7. Padding each selected part with zeros to make its length equal to a predefined fixed length.

MIT-BIH Arrhythmia dataset :

  • Number of Categories: 5
  • Number of Samples: 109446
  • Sampling Frequency: 125Hz
  • Data Source: Physionet’s MIT-BIH Arrhythmia Dataset
  • Classes: [’N’: 0, ‘S’: 1, ‘V’: 2, ‘F’: 3, ‘Q’: 4]


Class distribution in the dataset

  • Before Resampling

  • After Resampling


Model


Figure 1: Model Structure


Results

  • Accuracy: 73%


Figure 2: Accuracy and Loss Plot




Figure 3: Confusion Matrix




Figure 4: Classification Report



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