Pacemaker with activity-dependent rate limiting
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United States of America Patent
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-
Aug 7, 1990
Grant Date -
N/A
app pub date -
Jun 6, 1989
filing date -
Jun 6, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pacemaker is disclosed with a pacing rate that is restricted within a range defined by variable upper and lower rate limits that change as a function of the patient's detected level of activity. An indication such as the nonambient temperature of blood is sensed in the right ventricle of the heart to indicate detected activity level. Other activity indications, such as blood oxygen concentration and body motion, either singly or in combination are also disclosed. A control circuit of the pacemaker varies the upper and lower rate limits according to the patient's detected level of activity. The control circuit also varies the atrial and ventricular refractory periods along with the AV delay period in response to detected activity level changes.
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