| Autor: |
Xuejun, Ren, Shuzheng, Lu, Chengjun, Guo, Liying, Chen, Hong, Liu, Rui, Tian, Yanfei, Yang, Jinrong, Zhang |
| Rok vydání: |
2003 |
| Předmět: |
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| Zdroj: |
Chinese medical journal. 116(11) |
| ISSN: |
0366-6999 |
| Popis: |
To determine whether the extent of prolongation of the transisthmus interval after ablation predicts complete bidirectional block.Since 1996 to 2002, 30 consecutive patients underwent ablation procedures for isthmus-dependent atrial flutter. There were 23 males and 7 females [mean age (47.85 +/- 9.35) years]. With the use of fluoroscopic view of anatomy, radiofrequency ablation was performed during coronary sinus pacing at a cycle length of 600 ms.Bidirectional block was achieved with ablation in 29 (97%) of 30 patients. The transisthmus intervals before ablation and after complete transisthmus block were (73.82 +/- 13.01) ms and (140.47 +/- 20.48) ms, respectively, in the clockwise direction (P0.0001), and (77.63 +/- 8.36) ms and (138.17 +/- 15.55) ms, respectively, in the counterclockwise direction (P0.0001). A period of incomplete isthmus block was observed during 17 (58%) of the 29 ablation procedures. The clockwise transisthmus intervals during incomplete block [(107.65 +/- 21.33) ms] were (45.5 +/- 8.7)% longer than the baseline transisthmus intervals. An increase in the transisthmus interval byor = 50% in both directions after ablation predicted complete bidirectional block with 100.0% sensitivity and 83.3% specificity. The positive and negative predictive values were 90.6% and 100.0%, respectively. The diagnostic accuracy of aor = 50% prolongation in the transisthmus interval was 83.3%.The analysis of transisthmus interval is a valuable method for determining complete bidirectional isthmus block. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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