Effect of intracavitary electrode position on endocardial potential estimates

The authors determine the effect of uncertainty in intracavitary electrode position on the accuracy of estimated endocardial potentials. Positional uncertainty is simulated by randomly moving a multielectrode intracavitary probe, and statistical estimation theory is used to build an optimum estimation, under the assumption that the endocardial potentials are uncorrelated. For electrode positional uncertainty within 0.2 cm of its original location, an expected RMS error of 30.17+or-8.41% was achieved. Increasing positional uncertainties to within 0.52 cm and 1.04 cm resulted in errors of 54.59+or-84.62+or-7.13%, respectively. These stimulated results imply that positional uncertainty is a major source of error in estimating endocardial potentials from intracavitary potentials.<>