Browsing by Author "Vergara, I"

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    Effects of Carvedilol upon intra- and interventricular synchrony in patients with chronic heart failure
    (EXCERPTA MEDICA INC-ELSEVIER SCIENCE INC, 2005) Castro, PF; Mc Nab, P; Quintana, JC; Bittner, A; Greig, D; Vergara, I; Vukasovic, JL; Corbalan, R; Copaja, M; Diaz Araya, G; Chiong, M; Troncoso, R; Alcaino, H; Lavandero, S
    Radionuclide isotopic ventriculography with phase analysis was performed in 30 patients with stable heart failure (HF), determining left ventricular (LV) and interventricular contraction synchrony at baseline and after 6 months of treatment with maximal tolerated doses of carvedilol. Patients with HF had significant ventricular dyssynchrony compared with a normal population. The 50th percentile of patients with the greatest dyssynchrony at baseline showed significant improvement in ventricular synchrony after receiving carvedilol, and this was correlated positively with a reduction in end-diastolic LV volumes. (c) 2005 Elsevier Inc. All rights reserved.
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    Radiofrequency catheter ablation of slow-pathway conduction. Experience in 30 cases
    (SOC MEDICA SANTIAGO, 1995) Vergara, I; Acevedo, M; Fajuri, A; Cambon, AM; Rosas, A; Gonzalez, R
    Atrioventricular nodal reentry tachycardia (AVNRT) is one of the most frequent mechanism of paroxysmal supraventricular tachycardia. In these patient tachycardia is maintained due to anterograde conduction through a slow pathway and retrograde conduction to the atrium via a fast pathway. We present herein our experience in ablation of the slow pathway. Since January 1993, 30 consecutive patients with AVNRT underwent attempted catheter ablation of the slow pathway. Mean age was 35 +/- 3.7 years. All patients has symptomatic tachycardia and six had history of syncope. Electrophysiologic studies revealed AVNRT in all patients, in addition, two patients had a left accessory pathway. Slow pathway ablation was performed with a Mansfield 7 F catheter, guided by both fluoroscopic positioning and endocardial signals. A mean of 13 bursts were applied. in the 30 patients conduction through the slow pathway was interrupted, and thus tachycardia was no longer inducible. Retrograde conduction post ablation was evaluated in 17 of the 30 patients, significant changes were observed in three of them. One patient developed second degree AV block and a permanent observed in three of them. One patient developed second degree AV block and a permanent pacemaker was implanted. Another patient had recurrence of tachycardia three months post ablation. After a second attempt she is arrhythmia free. Patients have been followed for a mean of 15.7 +/- 2.5 months and are asymptomatic in the absence of antiarrhythmic therapy.