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US 5,713,930 AGranted
Dual chamber pacing system and method with control of AV interval
AssigneeVitatron Medical, B.V.
InventorsJohannes S. van der Veen, Geeske van Oort
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AssigneeVitatron Medical, B.V.
InventorsJohannes S. van der Veen, Geeske van Oort
Estimating the term…
A dual chamber pacemaker system and method is provided for adjusting AV delay to provide for an optimal AV setting for a selected pacing application. In the inventive system and method, the basis for determining the AV delay setting is to perform a ventricular fusion test, wherein variations in QT interval are monitored corresponding to variations in AV interval. Based upon the AV-QT data, the pacemaker can determine the ventricular fusion zone where the pacemaker AV interval is substantially the same as the intrinsic conduction interval, as well as the knee where AV intervals just shorter than the ventricular fusion zone result in full capture. The pacemaker selects a routine for adjusting AV interval depending upon a desired application, including the applications of adjusting AV interval for full capture and for treatment of a HOCM patient. There is also provided a routine for determining an appropriate AV hysteresis value for inhibiting ventricular pacing and allowing ventricular sensing as much as possible, for patients with intermittent AV block.
A dual chamber pacemaker system, said pacemaker having ventricular pacing means for generating ventricular pace pulses for delivery to a patient's ventricle, atrial pacing means for generating atrial pace pulses for delivery to the patient's atrium, atrial sense means for sensing patient atrial contractions, AV means for timing out an AV interval for timing delivery of a ventricular pace pulse following an atrial sense or pace, and test means for determining the relationship between AV intervals and QT intervals, said test means comprising:
A method in a dual chamber pacemaker system for setting an AV interval value for achieving a selected application, comprising:
A dual chamber pacemaker system, having atrial sense means for sensing atrial signals from a patient, ventricular sense means for sensing ventricular signals from a patient, ventricular pace means for generating and delivering ventricular pace pulses to said patient's right ventricle, and sync control means for controlling said pace means to generate and deliver a ventricular pace pulse at a controlled AV escape interval following a sensed atrial signal, said sync control means having AV.sub.esc means for setting said AV escape interval, said AV.sub.esc means comprising:
Dependencies are inferred from the claim text.