systole.detection.ecg_peaks#

systole.detection.ecg_peaks(signal: Union[List, ndarray, Series], sfreq: int = 1000, new_sfreq: int = 1000, method: str = 'sleepecg', find_local: bool = False, win_size: float = 0.1, clean_nan: bool = False, verbose: bool = False) → Tuple[ndarray, ndarray][source]#

A simple wrapper for many popular R peaks detectors algorithms.

This function calls methods from py-ecg-detectors [1].

Parameters

signal: The raw ECG signal.
sfreq: The sampling frequency. Default is set to 1000 Hz.
new_sfreq: The new sampling frequency. Defaults to 1000 Hz.
method: The method used. Can be one of the following: ‘sleepecg’, ‘hamilton’, ‘christov’, ‘engelse-zeelenberg’, ‘pan-tompkins’, ‘moving-average’.
find_local: If True, will use peaks indexs to search for local peaks given the window size (win_size).
win_size: Size of the time window used by systole.utils.to_neighbour() expressed in seconds. Defaut set to 0.1.
clean_nan: If True, will interpolate NaNs values if any before any other operation. Defaults to False.
verbose: Control function verbosity. Defaults to False (do not print processing steps).

Returns

resampled_signal: Signal resampled to the new_sfreq frequency.
peaks: Boolean array corresponding to the R peaks detection.

Raises

ValueError

If method is not one of the following: ‘hamilton’, ‘christov’,: ‘engelse-zeelenberg’, ‘pan-tompkins’, ‘moving-average’

Notes

Warning

This function will resample the signal to 1000 Hz.

References

1: Howell, L., Porr, B. Popular ECG R peak detectors written in python. DOI: 10.5281/zenodo.3353396

Examples

>>> from systole import import_dataset
>>> from systole.detection import ecg_peaks
>>> signal_df = import_dataset()[:20*2000]
>>> signal, peaks = ecg_peaks(signal_df.ecg.to_numpy(), method='hamilton',
>>>                           sfreq=2000, find_local=True)
>>> print(f'{sum(peaks)} peaks detected.')
24 peaks detected.