Method and apparatus for detecting cardiac event oversensing

A method comprising:

• sensing a plurality of cardiac electrical signals;
• determining signal features from the plurality of cardiac electrical signals;
• detecting an alternating pattern of the signal features;
• identifying, based on the alternating pattern of the signal features, at least one segment of the plurality of cardiac electrical signals that is a suspected R-wave;
• from the at least one segment identified as a suspected R-wave, determining at least one of:
• a maximum signal pulse width;
• or
• an amplitude metric;
• based on at least one of the maximum signal pulse width or the amplitude metric, determining that the suspected R-wave is one of:
• a tachyarrhythmia morphology;
• or
• a true sensed R-wave;
• detecting a tachyarrhythmia in response to at least determining the suspected R-wave is the tachyarrhythmia morphology;
• withholding detecting the tachyarrhythmia in response to at least determining that the suspected R-wave is the true sensed R-wave;
• and
• delivering a tachyarrhythmia therapy in response to detecting the tachyarrhythmia.

A non-transitory computer-readable medium storing a set of instructions which, when executed by a control circuit of a medical device, cause the medical device to:

• sense a plurality of cardiac electrical signals;
• determine signal features from the plurality of cardiac electrical signals;
• detect an alternating pattern of the signal features;
• identify, based on the alternating pattern of the signal features, at least one segment of the plurality of cardiac electrical signals that is a suspected R-wave;
• from the at least one segment identified as a suspected R-wave, determine at least one of:
• a maximum signal pulse width;
• or
• an amplitude metric;
• based on at least one of the maximum signal pulse width or the amplitude metric, determine that the suspected R-wave is one of:
• a tachyarrhythmia morphology;
• or
• a true sensed R-wave;
• detect a tachyarrhythmia in response to at least determining the suspected R-wave is the tachyarrhythmia morphology;
• withhold detecting the tachyarrhythmia in response to at least determining that the suspected R-wave is the true sense R-wave;
• and
• deliver a tachyarrhythmia therapy in response to detecting the tachyarrhythmia.