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The number of electrodes required to reproduce a body surface potential map (BSPM) can be reduced by making use of the correlations among potentials measured at different sites on the body surface, as pointed out by Lux et al. in 1978. In the present paper, we have introduced two distinct methods which can be used to improve the accuracy of the potential… (More)
The changes of monophasic action potential durations due to stellate stimulation for the period of 3 sec were studied in dogs with suction electrodes from the anterior surface of the right ventricle and the posterior surface of the left ventricle. Prolongation of monophasic action potential duration was observed from the period of 2 to 3 sec during… (More)
It is not clear whether there is any relationship between cardiac output and myocardial blood flow in the infarcted heart. We measured regional myocardial blood flow (RMBF) quantitatively by positron emission tomography (PET) with 13N-ammonia at rest in 18 patients with prior myocardial infarction. RMBF was calculated using the radioactivity in myocardial… (More)
A single-dipole model and a two-dipole model have been examined to approximate the electrical activity of heart; positions as well as vector components of these dipoles were estimated from the body surface potential distribution that was measured with 64 electrodes arranged on the chest. The "residue" has been defined as a measure for how much potential… (More)
By means of the least square method, the motion of an equivalent electric dipole which simulates electric activity of the heart was traced from body surface potentials. In normal case, this equivalent dipole was a good approximation.