New Discovery of Left Atrial Macroreentry Tachycardia: Originating from the Spontaneous Scarring of Left Atrial Anterior Wall

Figure 4

Subsegmentation of the low-voltage area on the left atrial anterior wall. (a) Area 1 was near the anterior MV at 11-12 o’clock; area 2 is the critical isthmus; area 3 was located at the mid anterior level of the left atrial anterior wall (LAAW); area 4 was located at the anterior top of the left atrium (LA) near the basal of left atrial appendage (LAA). (Top left illustration) the three-dimensional (3D) enhanced cardiac computed tomography shows the anatomical relationship between the LA, aorta, and pulmonary artery. (b) Voltage maps show patients with different degrees of scarring have a critical isthmus (black dotted lines) between the scar of LAAW and the MV. LAA: left atrial appendage; MV: mitral valve; LSPV: left superior pulmonary vein; RSPV: right superior pulmonary vein.

(a)

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