Rate adaptive cardiac pacemaker responsive to patient activity a

Details Rate adaptive cardiac pacemaker responsive to patient activity a Rate adaptive cardiac pacemaker responsive to patient activity a

1987-08-07

1988-11-08

Kamm, William E.

Surgery

Truss

Pad

A61N 136

Patent

active

047828366

ABSTRACT:
A stimulus generator for a stimulation rate-adaptive cardiac pacemaker has a detector for sensing a first physiological parameter in the pacemaker patient, selected on the basis that heart rate is a function of that parameter, such as central venous blood temperature, and another detector for sensing a second physiological parameter in the patient representative at any given time of either patient activity or patient inactivity, such as a motion sensor. Two different algorithms are stored relating heart rate to the first physiological parameter, one for patient inactivity and the other for patient activity, in which the activity algorithm specifies a greater rate of change of heart rate than that specified by the inactivity algorithm relative to a unit change of said first physiological parameter. A decision rule is implemented based on the measurement of the second physiological parameter, by which a decision is to be made for selecting between the two different algorithms. Logic circuitry is responsive to detection of a change of the second physiological parameter to apply the decision rule to select between the two algorithms, for controlling the rate at which stimuli are generated by the stimulus generator according to the selected algorithm, and thereby, according to a heart rate physiologically appropriate to the patient's state.

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