Source code for bradyTachyCardia

def bradyTachyCardia(HRinst):
    """Determines when bradycardia or tachycardia occurred in the ECG trace

    :param HRinst: (ndarray)
    :returns: (list) of same length as HRinst that indicates when brady- or tachycardia occurred
    """

    import numpy as np

    bradyTachy = ['']*np.size(HRinst)

    for i, val in enumerate(HRinst):
        if val <= 60:  # this indicates bradycardia, aka the heart is beating too slowly
            bradyTachy[i] = 'B'
        elif val >= 100:  # this indicates tachycardia, aka the heart is beating too quickly
            bradyTachy[i] = 'T'
        else:  # otherwise the heart is beating normally
            bradyTachy[i] = 'N'

    return bradyTachy