Nevertheless, thorough examination of the signals of the bottom of the
LA showed double signals directly opposite to the entire CS: one sharper
signal simultaneous to the recorded signal in CS (encircled in Figure 1)
and in addition highly fractionated signals, which presented a sequence
proximal to distal (see stars and arrows in Figure 1). Examination of
the propagation pattern of the adjacent LA led to the conclusion that
the sharper component presented a near field signal of the LA endocard
and the low voltage fractionated signal presented a far field signal of
epicardial myocardial sleeves, i.e. CS
musculature.
Figure 1 Signals on the grid catheter on the bottom of the LA opposite
to CS with two components. Sharp signals simultaneously to the signals
on the decapolar catheter (rather posteriorly, encircled). Highly
fractionated signals with a sequence proximal to distal (stars and
arrows). Blue globes represent exemplary points with double signals
adjacent the entire CS. White globes show the exits into the LA and RA.