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Graphs show receiver operating characteristic curves for (a) parallel and (b) perpendicular antenna distance. Logistic regression graphs show relationship between (c) parallel and (d) perpendicular antenna position and risk of significant cardiac arrhythmia. Several parallel ablations performed less than 5 mm from heart resulted in no significant arrhythmia (c). Single arrhythmia occurred among ablations performed with perpendicular antenna positioning (d). CI = confidence interval.
