06190324 is referenced by 177 patents and cites 21 patents.

An implantable medical device determines activity levels and Heart Rate and from a combination of these produces a value for a heart rate activity coefficient (HRAC). This value has significant diagnostic and patient tracking value. Methods and apparatus for determining this HRAC value are described. This enables physician review of patient cardiac status. Additional physiologic data can be recorded along with the HRAC data if desired, and this too, as well as the HRAC data alone, may be reported out from the implanted device to a medical communications system for alarm purposes, titrating drugs/therapies or other monitoring tasks. Further, substitutes for heart rate measurements and activity measurements are described which can be used to augment or substitute for heart rate measurements and activity measurements. These substitutes should represent cardiovascular or cardiac responsiveness to substitute for heart rate in the HRAC signal; and should represent cardiac demand to substitute for activity in the HRAC signal.

Title
Implantable medical device for tracking patient cardiac status
Application Number
9/301206
Publication Number
6190324 (B1)
Application Date
April 28, 1999
Publication Date
February 20, 2001
Inventor
Kenneth M Riff
Plymouth
MN, US
Robert S Kieval
Golden Valley
MN, US
Agent
Harold R Patton
US
Michael B Atlass
US
Assignee
Medtronic
MN, US
IPC
A61B 5/04
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