Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Patent
1998-09-30
1999-11-23
Schaetzle, Kennedy J.
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
A61N 1368
Patent
active
059916591
ABSTRACT:
There is provided a pacemaker system with an SRD detection and intervention feature, which enables a simple way of initiating confirmation of SRD, i.e., looking for an AS/AP transition in a DDD or DDI pacemaker, or a transition from a VS to a VP in a DDI pacemaker. This simple initiation of SRD confirmation is made possible by use of a relatively wide hysteresis band which is normally operative when a spontaneous rate is present, and which tracks physiological changes in the patient's natural rate, across the pacemaker rate range. Transitions which result from a gradual decrease in natural rate and thus represent physiological bradycardia are not interpreted as suggesting SRD. The detection is confirmed only after a predetermined number of pace pulses are delivered at the hysteresis rate, i.e., 1-5 pulses. In a preferred embodiment, after confirmation of SRD, pacing starts at a programmable intervention rate, and rate flywheels downward toward a lower rate limit, with intermittent hysteresis scans at a lower rate to enable recovery of an underlying natural rate. The SRD mode is left whenever recovery of a natural rate is confirmed, as by sensing a predetermined number of consecutive natural atrial beats in DDD mode or atrial and/or ventricular beats in DDI mode.
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De Vries Bernhard
Idink Johannes G. F.
Reineman Hendrik
van Rooijen Hendrik
Jaro Michael J.
Patton Harold
Schaetzle Kennedy J.
Vitatron Medical B.V.
Woods Thomas F.
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