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. 2019 Jan 23;5(7):351–353. doi: 10.1016/j.hrcr.2018.12.012

Figure 2.

Figure 2

Voltage mapping of the left atrium (LA) using the HD Grid (Abbott Technologies, Minneapolis, MN) with evidence of electrical conduction through the right posterior carina connecting into the right superior pulmonary vein (RSPV). Local electrograms recorded from this region showed significant fractionation (total duration of fractionation 132 ms) in this region, suggestive of slow conduction from the LA to the RSPV. Pacing from the right inferior pulmonary vein (RIPV) from the distal electrodes (A1–A2) demonstrated evidence of local capture within the pulmonary vein on poles B1–B2, C1–C2, D1–D2, C2–C3, and D2–D3, which did not result in local LA depolarization on poles A3–A4. LAA = left atrial appendage; LIPV = left inferior pulmonary vein; LSPV = left superior pulmonary vein.