Method and apparatus for detecting and discriminating tachycardia

A medical device for discriminating cardiac events, comprising:

• a first electrode pair sensing cardiac signals along a first sensing vector;
• a second electrode pair sensing cardiac signals along a second sensing vector different from the first sensing vector;
• and
• a processor configured to determine a first match score corresponding to the cardiac signals sensed along the first sensing vector, determine whether the first match score is within one of a first match zone corresponding to a first cardiac event, and a second match zone corresponding to the first cardiac event, determine a second match score corresponding to the cardiac signals sensed along the second sensing vector, determine whether the second match score is within one of the first match zone, the second match zone, and a third match zone corresponding to a second cardiac event different from the first cardiac event, perform one of increasing and decreasing an event counter in response to both the determination of whether the first match score is within one of the first match zone and the second match zone and the determination of whether the second match score is within one of the first match zone, the second match zone, and the third match zone, and discriminate cardiac events in response to the event counter.

A non-transitory computer readable medium having computer executable instructions for performing a method, the method comprising:

• sensing cardiac signals along a first sensing vector and a second sensing vector different from the first sensing vector;
• determining a first match score corresponding to the cardiac signals sensed along the first sensing vector;
• determining whether the first match score is within one of a first match zone corresponding to a first cardiac event, and a second match zone corresponding to the first cardiac event;
• determining a second match score corresponding to the cardiac signals sensed along the second sensing vector;
• determining whether the second match score is within one of the first match zone, the second match zone, and a third match zone corresponding to a second cardiac event different from the first cardiac event;
• performing one of increasing and decreasing an event counter in response to both the determination of whether the first match score is within one of the first match zone and the second match zone and the determination of whether the second match score is within one of the first match zone, the second match zone, and the third match zone;
• and
• discriminating cardiac events in response to the event counter.