Apparatus and method for detecting atrial fibrillation by morphological analysis
First Claim
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1. In an implantable cardiac device, an atrial fibrillation detector comprising:
- an atrial sensor for sensing a first and a second atrial signal, said atrial signals being spaced in one of a spacial and temporal domain;
a first and a second storage for storing said first and second atrial signals, respectively;
a morphological comparator coupled to said storages for comparing said first and second atrial signals; and
an atrial fibrillation indicator for generating a signal indicative of atrial fibrillation based on said morphological comparator.
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Abstract
In an implantable cardiac device, atrial signals, spaced either spatially or temporally, are sensed and stored. The morphology of the signals are compared and an atrial fibrillation indication is generated if the signals are different. The device then either changes its mode of operation or applies appropriate therapy.
161 Citations
19 Claims
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1. In an implantable cardiac device, an atrial fibrillation detector comprising:
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an atrial sensor for sensing a first and a second atrial signal, said atrial signals being spaced in one of a spacial and temporal domain; a first and a second storage for storing said first and second atrial signals, respectively; a morphological comparator coupled to said storages for comparing said first and second atrial signals; and an atrial fibrillation indicator for generating a signal indicative of atrial fibrillation based on said morphological comparator. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A dual chamber pacemaker comprising:
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an atrial sensor for sensing intrinsic atrial activity; an atrial pacer for generating atrial pulses in response to atrial pace commands; a ventricular sensor for sensing ventricular activity; a ventricular pacer for generating ventricular pulses in response to ventricular pace commands; an atrial fibrillation detector for generating an atrial fibrillation detection signal; and a controller receiving signals indicative of said atrial and ventricular activity and said atrial fibrillation detection signal, said controller generating said command signals; said atrial fibrillation detector including; a sensor for sensing two spaced atrial signals; and a morphological analyzer comparing the morphology of said atrial signals, said analyzer generating said atrial fibrillation detection signal if the morphology indicates a difference in said signals. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. In an implantable cardiac device having means for sensing atrial activity and means for applying cardiac therapy in response, a method of detecting atrial fibrillation comprising the steps of:
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sensing two spaced atrial signals; comparing morphologically said atrial signals; and generating an atrial fibrillation indication signal if said signals are different. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification