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Figure 1 Right anterior oblique 45° and left anterior oblique 45° fluoroscopic projections during the biatrial basket study. Each basket electrode has eight splines with eight electrodes (four bipoles) on each spline. The basket electrode was positioned in the left atrium using the transseptal puncture technique. The spline with a mark at the distal third was designated as spline A, with a mark at the middle third as spline B and distal third spline C. The splines next to spline C were designated splines D, E, F, G and H serially. LAO = left anterior oblique; RAO = right anterior oblique.