| 摘要 |
An evoked response detector for a heart stimulator is provided for determining evoked response in the presence of polarization. The heart stimulator comprises a pulse generator devised for producing stimulation pulses of varying amplitudes, and a lead (6) is intended to be introduced into the heart (8) of a patient and connected to the pulse generator for delivering stimulation pulses to the heart. The evoked response detector (4) comprises measuring and memory means (10, 14, 16, 18) for measuring and storing the electrode signals picked up by the lead in response to the delivered stimulation pulses, at least one of said stimulation pulses having a sufficient high amplitude for obtaining capture. Each measured electrode signal comprises two signal components, one of said signal components being proportional to the amplitude of the associated stimulation pulse and the other signal component being substantially constant independent of the associated stimulation pulse amplitude. Analyzing means (12) are provided for determining the evoked response signal from a predetermined relation between the amplitudes of at least two stimulation pulses of different amplitudes and the resulting measured electrode signals. <IMAGE>
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