Epicardial microwave ablation on the beating heart for atrial fibrillation: The dependency of lesion depth on cardiac output Spencer J. Melby, MD, Andreas.

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Epicardial microwave ablation on the beating heart for atrial fibrillation: The dependency of lesion depth on cardiac output Spencer J. Melby, MD, Andreas Zierer, MD, Scott P. Kaiser, BS, Richard B. Schuessler, PhD, Ralph J. Damiano, MD The Journal of Thoracic and Cardiovascular Surgery Volume 132, Issue 2, Pages 355-360 (August 2006) DOI: 10.1016/j.jtcvs.2006.02.008 Copyright © 2006 The American Association for Thoracic Surgery Terms and Conditions

Figure 1 FLEX 10 microwave device, Guidant Corporation (Santa Clara, Calif). The Journal of Thoracic and Cardiovascular Surgery 2006 132, 355-360DOI: (10.1016/j.jtcvs.2006.02.008) Copyright © 2006 The American Association for Thoracic Surgery Terms and Conditions

Figure 2 Left atrium postprocedure. A, Lesion done at 0.0 L/min. B, Lesion done at 5.0 L/min. The Journal of Thoracic and Cardiovascular Surgery 2006 132, 355-360DOI: (10.1016/j.jtcvs.2006.02.008) Copyright © 2006 The American Association for Thoracic Surgery Terms and Conditions

Figure 3 Lesion transmurality versus CO. Lesions done at 120 seconds (left); lesions done at 60 seconds (right). *Statistical analysis revealed that there was a significantly higher number of lesions that were transmural in the group on full CPB (60-second lesions) versus the other 3 groups in which CO was greater than 0.5 L/min (P < .01). **There was a trend toward significance in the number of transmural lesions in the group on full CPB for 120 seconds (27/27, 100%) versus the group on full CPB for 60 seconds (52/58, 90%; P = .092). The Journal of Thoracic and Cardiovascular Surgery 2006 132, 355-360DOI: (10.1016/j.jtcvs.2006.02.008) Copyright © 2006 The American Association for Thoracic Surgery Terms and Conditions

Figure 4 Lesion width versus CO. *Comparison showed that 60-second lesions were significantly wider when on full CPB versus the other 3 groups (P < .001). **Lesions were significantly wider when the CO was 0.0 to 0.5 L/min and the lesions were done for 120 seconds: 9.7 ± 3.9 mm (P < .001 when compared with 60-second lesions at same CO). The Journal of Thoracic and Cardiovascular Surgery 2006 132, 355-360DOI: (10.1016/j.jtcvs.2006.02.008) Copyright © 2006 The American Association for Thoracic Surgery Terms and Conditions