St. Jude Medical Ab

&angst;sa Uhrenius

Peter Andersson

Berit Larsson

Feresteh Shojael

G&ouml;ran Budgifvars

A heart stimulator has an evoked response detector which determines evoked response in the presence of polarization. To determine the magnitude of the polarization for different stimulation amplitudes, the electrode signals picked up by a lead after the delivery of a stimulation pulse having a selected amplitude are measured. A polarization signal is obtained from the picked up signals, and this polarization signal, with modification, is subtracted from signals picked up following subsequently emitted stimulation pulses. Dependent on the subtraction result, a determination is made as to whether an evoked response has occurred.

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Stockholm, Sweden

&angst;sa Uhrenius