Utilization of morphology discrimination after T-wave oversensing determination for underlying rhythms in the therapy zone

A method for detecting cardiac tachyarrhythmia episodes and delivering therapy, comprising:

• sensing cardiac events;
• determining intervals between the sensed cardiac events;
• determining a predetermined cardiac episode is occurring in response to the determined intervals;
• determining whether a ventricular rate is greater than an atrial rate in response to the determined intervals;
• determining whether oversensing is occurring in response to the ventricular rate being greater than the atrial rate;
• determining T-wave analysis windows indicating oversensing;
• determining oversensing is occurring in response to determining that a threshold number of T-wave analysis windows indicating oversensing occur contemporaneously with the determined intervals;
• adjusting the determined intervals in response to oversensing occurring to generate an adjusted ventricular rate;
• determining whether the cardiac episode is occurring in response to the adjusted ventricular rate;
• performing a supraventricular tachycardia (SVT) discrimination analysis in response to the cardiac episode occurring in response to the adjusted ventricular rate;
• and
• delivering therapy in response to the SVT discrimination analysis.

A non-transitory, computer-readable medium comprising instructions for causing a detection module of a medical device to perform a method, the method comprising:

• sensing cardiac events;
• determining intervals between the sensed cardiac events;
• determining a predetermined cardiac episode is occurring in response to the determined intervals;
• determining whether a ventricular rate is greater than an atrial rate in response to the determined intervals;
• determining whether oversensing is occurring in response to the ventricular rate being greater than the atrial rate;
• determining T-wave analysis windows indicating oversensing;
• determining oversensing is occurring in response to determining that a threshold number of T-wave analysis windows indicating oversensing occur contemporaneously with the determined intervals;
• adjusting the determined intervals in response to oversensing occurring to generate an adjusted ventricular rate;
• determining whether the cardiac episode is occurring in response to the adjusted ventricular rate;
• performing a supraventricular tachycardia (SVT) discrimination analysis in response to the cardiac episode occurring in response to the adjusted ventricular rate;
• and
• delivering therapy in response to the SVT discrimination analysis.