Heart stimulator detecting atrial arrhythmia by determing wall distension by impedance measuring
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Abstract
In an implantable pacemaker, pacing pulses are delivered to a ventricle in a P-wave synchronous mode as long as no atrial arrhythmia is detected, pacing pulses and a mode switch is made to deliver pacing pulses to the ventricle in a non-P-wave synchronous mode if atrial arrhythmia is detected. From an impedance signal measured in the atrium, atrial distention is determined and, in the non-P-wave synchronous mode, the delivery rate of the pacing pulses is increased to decrease the atrial distention during atrial arrhythmia.
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Citations
12 Claims
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1-6. -6. (canceled)
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7. An implantable pacemaker comprising:
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a pulse generator adapted to interact with at least one ventricle of a heart to deliver pacing pulses to that ventricle;
a cardiac signal detector adapted to interact with the heart to detect cardiac signals originating from an atrium of the heart;
an arrhythmia detector connected to the cardiac signal detector that analyzes said cardiac signals to detect an occurrence of atrial arrhythmia;
an impedance measuring unit adapted to interact with said atrium to measure an atrial impedance therein; and
a controller connected to said pulse generator, said arrhythmia detector and said impedance measuring unit, said controller controlling said pulse generator to cause said pulse generator to deliver said pacing pulses to the ventricle in a P-wave synchronous mode as long as no atrial arrhythmia is detected by said arrhythmia detector, and said controller switching control of said pulse generator to a non-P-wave synchronous mode if atrial arrhythmia is detected by said arrhythmia detector, and said controller determining an atrial distention of said atrium from the atrial impedance measured by said impedance measuring unit and, in said non-P-wave synchronous mode, controlling said pulse generator to increase a delivery rate of said pacing pulses that decreases said atrial distention during said atrial arrhythmia. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification