Pacing system with full range sudden rate drop detection and responsive pacing intervention
US5991659A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 1998 |
| Grant date | Nov 23, 1999 |
| Priority date | — |
| Expiry date | Sep 30, 2018 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61N1/368
- WIPO fieldMedical technology
- WIPO sectorInstruments
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 consecutiv…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.