Contact and Noncontact Catheters and Reconstructed Surface Mesh of LA
(A) Depiction of the noncontact catheter with 6 splines, each carrying 8 ultrasound transducers and 8 high-fidelity unipolar electrodes. (B) Noncontact catheter and circular contact catheter in the left atrium (LA) (left anterior oblique [LAO] view). (C) LA anatomy constructed by the noncontact catheter mapping system (posteroanterior [PA] view). The noncontact mapping catheter is shown in the center of the LA chamber and the contact circular mapping catheter is positioned on the posterior wall. (D) Morphology comparison, cross-correlation (Xcorr), of 10 noncontact reconstructed and contact electrogram pairs. The yellow dots represent 10 locations of the circular contact mapping electrodes with the relevant paired contact (red)/noncontact (blue) electrogram. CS = coronary sinus; LAA = left atrial appendage; LIPV = left inferior pulmonary vein; LSPV = left superior pulmonary vein; RIPV = right inferior pulmonary vein; RSPV = right superior pulmonary vein.