Described are computer-based methods and apparatuses including computer program products for automated atrial fibrillation detection. Based on morphology analysis atrial beats are recognized and used for R-R intervals analysis. The invented system creates R-R interval classes and estimates irregularity indicator value (deviation) for each class. The total average R-R intervals deviation for all analyzed atrial beats is calculated by weighted averaging of the irregularity indicator values of all classes where the weight values are equal to the class sizes.
