Your browser doesn't support javascript.
loading
Show: 20 | 50 | 100
Results 1 - 4 de 4
Filter
1.
Arq. bras. cardiol ; 78(1): 1-16, Jan. 2002. ilus, tab
Article in Portuguese, English | LILACS | ID: lil-301414

ABSTRACT

OBJECTIVE: To identify useful clinical characteristics for selecting patients eligible for mapping and ablation of atrial fibrillation. METHODS: We studied 9 patients with atrial fibrillation, without structural heart disease, associated with: 1) antiarrhythmic drugs, 2) symptoms of low cardiac output, and 3) intention to treat. Seven patients had paroxysmal atrial fibrillation and 2 had recurrent atrial fibrillation. RESULTS: In the 6 patients who underwent mapping (all had paroxysmal atrial fibrillation), catheter ablation was successfully carried out in superior pulmonary veins in 5 patients (the first 3 in the left superior pulmonary vein and the last 2 in the right superior pulmonary vein). One patient experienced a recurrence of atrial fibrillation after 10 days. We observed that patients who had short episodes of atrial fibrillation on 24-hour Holter monitoring before the procedure were those in whom mapping the focus of tachycardia was possible. Tachycardia was successfully suppressed in 4 of 6 patients. The cause of failure was due to the impossibility of maintaining sinus rhythm long enough for efficient mapping. CONCLUSION: Patients experiencing short episodes of atrial fibrillation during 24-hour Holter monitoring were the most eligible for mapping and ablation, with a final success rate of 66 percent, versus the global success rate of 44 percent. Patients with persistent atrial fibrillation were not good candidates for focal ablation


Subject(s)
Humans , Male , Adult , Middle Aged , Atrial Fibrillation , Catheter Ablation , Electrophysiologic Techniques, Cardiac , Patient Selection , Aged, 80 and over , Electrocardiography, Ambulatory
2.
Arq. bras. cardiol ; 75(1): 33-47, jul. 2000. tab
Article in Portuguese, English | LILACS | ID: lil-269910

ABSTRACT

OBJECTIVE: Risk stratification of patients with nonsustained ventricular tachycardia (NSVT) and chronic chagasic cardiomyopathy (CCC). METHODS: Seventy eight patients with CCC and NSVT were consecutively and prospectively studied. All patients underwent to 24-hour Holter monitoring, radioisotopic ventriculography, left ventricular angiography, and electrophysiologic study. With programmed ventricular stimulation. RESULTS: Sustained monomorphic ventricular tachycardia (SMVT) was induced in 25 patients (32 percent), NSVT in 20 (25.6 percent) and ventricular fibrillation in 4 (5.1 percent). In 29 patients (37.2 percent) no arrhythmia was inducible. During a 55.7-month-follow-up, 22 (28.2 percent) patients died, 16 due to sudden death, 2 due to nonsudden cardiac death and 4 due to noncardiac death. Logistic regression analysis showed that induction was the independent and main variable that predicted the occurrence of subsequent events and cardiac death (probability of 2.56 and 2.17, respectively). The Mantel-Haenszel chi-square test showed that survival probability was significantly lower in the inducible group than in the noninductible group. The percentage of patients free of events was significantly higher in the noninducible group. CONCLUSION: Induction of SMVT during programmed ventricular stimulation was a predictor of arrhythmia occurrence cardiac death and general mortality in patients with CCC and NSVT


Subject(s)
Humans , Male , Female , Adult , Middle Aged , Chagas Cardiomyopathy/mortality , Tachycardia, Ventricular/complications , Chagas Cardiomyopathy/complications , Chi-Square Distribution , Chronic Disease , Death, Sudden , Electrocardiography, Ambulatory , Electrophysiology , Follow-Up Studies , Prospective Studies , Radionuclide Ventriculography , Regression Analysis , Risk Factors , Statistics, Nonparametric , Survival Analysis , Tachycardia, Ventricular
SELECTION OF CITATIONS
SEARCH DETAIL