05284491 is referenced by 119 patents and cites 7 patents.

A pacemaker having a hysteresis feature which permits intrinsic heart activity, controlled by the sinus node to resume optimally after pacing. The pacemaker has a programmable lower rate and upper rate, a programmable lower hysteresis rate (LRH) corresponding to a lower rate hysteresis interval (LRHI), and a programmable rate (IR) intermediate an upper pacing rate (UR) and a lower pacing rate (LR). A microprocessor measures the average rate of change M.sub.AVG in the intervals between consecutive ventricular depolarizations, and compares the last intrinsic escape interval RR.sub.N to the lower rate hysteresis interval (LRHI).

If the last intrinsic escape interval RR.sub.N is longer than the lower rate hysteresis interval (LRHI), and if the value of M.sub.AVG is greater than a first preselected value SL.sub.1 but less than a second preselected value SL.sub.2, the pacemaker stimulates at the lower rate hysteresis (LRH) and thereafter gradually increases the pacing rate up to the intermediate rate (IR). A time counter maintains a continuous pacing at the intermediate rate (IR) for a predefined period of time, and the pacing rate is gradually decreased toward the lower pacing rate (LR).

Title
Cardiac pacemaker with hysteresis behavior
Application Number
7/842818
Publication Number
5284491
Application Date
February 27, 1992
Publication Date
February 8, 1994
Inventor
Ivan Bourgeois
Verviers
BE
Richard Sutton
London
GB
Agent
Gregory P Gadson
Harold R Patton
Assignee
Medtronic
MN, US
IPC
A61N 1/00
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