The disclosure relates to a method for arrhythmia detection within a heart signal of a patient, wherein the method is executed by a processor (2) and comprises steps of: providing an input signal (5) which refers to the heart signal of the patient, wherein the input signal (5) comprises cardiac events (6) and noise events (7), wherein the cardiac events (6) are related to cardiac activity of interest of the heart of the patient, and wherein the noise events (7) are not related to cardiac activity of interest of the heart； determining the cardiac events (6) from the input signal (5) in an arrhythmia detection window (9)； evaluating the arrhythmia detection window (9) by taking into account at least one of: (i) at least one noise event (7) occurring before a start of the arrhythmia detection window (9), and (ii) at least one noise event (7) occurring after an end of the arrhythmia detection window (9). Also, a device for arrhythmia detection is provided.
