Cardiac electrical signal gross morphology-based noise detection for rejection of ventricular tachyarrhythmia detection

A method comprising:

• sensing one or more cardiac electrical signals;
• sensing R-waves from the one or more cardiac electrical signals;
• obtaining a signal segment from the one or more cardiac electrical signals in response to one sensed R-wave, wherein obtaining the signal segment comprises determining a differential signal from the one or more sensed cardiac electrical signals;
• determining a noise pulse amplitude threshold from the signal segment;
• determining a noise pulse count from the signal segment using the noise pulse amplitude threshold;
• determining that the noise pulse count meets a noisy segment threshold;
• determining that the signal segment is a noisy signal segment in response to the noise pulse count meeting the noisy segment threshold;
• and
• in response to at least determining that the signal segment is a noisy signal segment, withholding detecting a tachyarrhythmia from the one or more cardiac electrical signals.

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

• sense one or more cardiac electrical signals;
• sense R-waves from the one or more cardiac electrical signals;
• obtain a signal segment from the one or more cardiac electrical signals in response to one sensed R-wave, wherein obtaining the signal segment comprises determining a differential signal from the one or more sensed cardiac electrical signals;
• determine a noise pulse amplitude threshold from the signal segment;
• determine a noise pulse count from the signal segment using the noise pulse amplitude threshold;
• determine that the noise pulse count meets a noisy segment threshold;
• determine that the signal segment is a noisy signal segment in response to the noise pulse count meeting the noisy segment threshold;
• and
• in response to at least determining that the signal segment is a noisy signal segment, withhold detecting a tachyarrhythmia from the one or more cardiac electrical signals.