Voltage Differences With Multielectrode Mapping IntroductionBipolar voltage criteria to delineate left atrial (LA) scar have been derived using point-by-point (PBP) contact electroanatomical mapping. It remains unclear how PBP-derived LA scar correlates with multielectrode fast automated mapping (ME-FAM) derived scar. We aimed to correlate scar and bipolar voltages from LA maps created using PBP versus ME-FAM. Methods and ResultsIn consecutive patients undergoing repeat AF ablation, 2 separate LA maps were created using PBP and ME-FAM during sinus rhythm before ablation. Contiguous areas in the LA with a bipolar voltage cutoff of 0.2 mV represented dense scar; LA scar percentage was calculated for each map. Each LA shell was divided into 9 regions and each region further subdivided into 4 quadrants for additional analysis; mean voltages of all points obtained using PBP versus ME-FAM in each region were compared. Forty maps (20 PBP: mean 228.5 95.6 points; 20 ME-FAM: 923.0 +/- 382.6 points) were created in 20 patients. Mapping time with ME-FAM was shorter compared with PBP (13.3 +/- 5.3 vs. 34.4 +/- 13.1 minutes; P < 0.001). Mean LA scar percentage was higher with PBP compared with ME-FAM (15.5 +/- 17.1% vs. 12.8 +/- 17.6%; P = 0.04). Mean PBP voltage distribution was lower (compared with ME-FAM) in the septum (0.95 +/- 0.73 vs. 1.46 +/- 0.99 mV; P = 0.009), posterior wall (0.84 +/- 0.42 vs. 1.40 +/- 0.83 mV; P = 0.0008), roof (0.78 +/- 0.80 vs. 1.39 +/- 1.09 mV; P = 0.0003), and right PV-LA junction (0.34 +/- 0.25 vs. 0.59 +/- 0.50 mV; P = 0.01) regions, while voltages were similar in all other LA regions (all P > 0.05). ConclusionsIn AF patients undergoing repeat ablation, bipolar voltage is greater in certain LA segments with ME-FAM compared with PBP mapping.
Comparison of Left Atrial Bipolar Voltage and Scar Using Multielectrode Fast Automated Mapping versus Point-by-Point Contact Electroanatomic Mapping in Patients With Atrial Fibrillation Undergoing Repeat Ablation
Muser D;
2017-01-01
Abstract
Voltage Differences With Multielectrode Mapping IntroductionBipolar voltage criteria to delineate left atrial (LA) scar have been derived using point-by-point (PBP) contact electroanatomical mapping. It remains unclear how PBP-derived LA scar correlates with multielectrode fast automated mapping (ME-FAM) derived scar. We aimed to correlate scar and bipolar voltages from LA maps created using PBP versus ME-FAM. Methods and ResultsIn consecutive patients undergoing repeat AF ablation, 2 separate LA maps were created using PBP and ME-FAM during sinus rhythm before ablation. Contiguous areas in the LA with a bipolar voltage cutoff of 0.2 mV represented dense scar; LA scar percentage was calculated for each map. Each LA shell was divided into 9 regions and each region further subdivided into 4 quadrants for additional analysis; mean voltages of all points obtained using PBP versus ME-FAM in each region were compared. Forty maps (20 PBP: mean 228.5 95.6 points; 20 ME-FAM: 923.0 +/- 382.6 points) were created in 20 patients. Mapping time with ME-FAM was shorter compared with PBP (13.3 +/- 5.3 vs. 34.4 +/- 13.1 minutes; P < 0.001). Mean LA scar percentage was higher with PBP compared with ME-FAM (15.5 +/- 17.1% vs. 12.8 +/- 17.6%; P = 0.04). Mean PBP voltage distribution was lower (compared with ME-FAM) in the septum (0.95 +/- 0.73 vs. 1.46 +/- 0.99 mV; P = 0.009), posterior wall (0.84 +/- 0.42 vs. 1.40 +/- 0.83 mV; P = 0.0008), roof (0.78 +/- 0.80 vs. 1.39 +/- 1.09 mV; P = 0.0003), and right PV-LA junction (0.34 +/- 0.25 vs. 0.59 +/- 0.50 mV; P = 0.01) regions, while voltages were similar in all other LA regions (all P > 0.05). ConclusionsIn AF patients undergoing repeat ablation, bipolar voltage is greater in certain LA segments with ME-FAM compared with PBP mapping.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
