Prevalence and Severity of Left Atrial Edema Detected by Electron Beam Tomography Early After Pulmonary Vein Ablation
Taro Okada, MD*,
Takumi Yamada, MD ,*,
Yoshimasa Murakami, MD*,
Naoki Yoshida, MD*,
Yuuichi Ninomiya, MD*,
Takeshi Shimizu, MD*,
Junji Toyama, MD*,
Yukihiko Yoshida, MD ,
Teruo Ito, MD,
Naoya Tsuboi, MD ,
Takahisa Kondo, MD||,
Yasuya Inden, MD||,
Makoto Hirai, MD|| and
Toyoaki Murohara, MD||
* Division of Cardiology, Aichi Prefectural Cardiovascular and Respiratory Center, Ichinomiya, Japan
Division of Cardiovascular Diseases, University of Alabama at Birmingham, Birmingham, Alabama
Division of Cardiology, Nagoya Dai-ni Red Cross Hospital, Cardiovascular Center, Nagoya, Japan
Division of Cardiology, Chukyo Hospital, Nagoya, Japan
|| Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
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Figure 1 Assessment of the LA Edema and Dimension
(A) The severity of the left atrial (LA) edema was graded semiquantitatively according to these schemas. (B) Axial electron beam tomography (EBT) images of the LA obtained before (pre) and after (post) the pulmonary vein (PV) ablation. The broken lines indicate the extent and the thickness of the LA edema on the right side of the LA posterior wall (arrow) where they were measured. (C) An axial EBT image of the LA at the slice just below the left inferior PV. At this level, the maximum width and length of the LA were measured. LIPV = left inferior pulmonary vein; RIPV = right inferior pulmonary vein.
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Figure 2 Comparison of the Severity of the LA Edema After the PV Ablation Between the 2 Groups
(A) Percentage of the Grade 0 to Grade 3 LA edema; (B) thickness of the LA edema. Blue bars = Group S; red bars = Group C. Abbreviations as in Figure 1.
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Figure 3 Representative Grade 3 LA Edema Observed in a Patient 1 Day After (Post) the PV Ablation
The LA edema observed immediately after the PV ablation gradually decreased and almost completely disappeared within 1 month after the PV ablation. Pre, 2W, and 1M represent before, 2 weeks after, and 1 month after the ablation, respectively. Abbreviations as in Figure 1.
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