Tratamento da fibrilaçäo atrial através da ablaçäo com radiofrequência utilizando mapeamento multipolar simultâneo das veias pulmonares / Treatment of atrial fibrillation with radiofrequency ablation and simultaneous multipolar mapping of the pulmonary veins

OBJECTIVE: To demonstrate the feasibility and safety of simultaneous catheterization and mapping of the 4 pulmonary veins for ablation of atrial fibrillation. METHODS: Ten patients, 8 with paroxysmal atrial fibrillation and 2 with persistent atrial fibrillation, refractory to at least 2 antiarrhythmic drugs and without structural cardiopathy, were consecutively studied. Through the transseptal insertion of 2 long sheaths, 4 pulmonary veins were simultaneously catheterized with octapolar microcatheters. After identification of arrhythmogenic foci radiofrequency was applied under angiographic or ultrasonographic control. RESULTS: During 17 procedures, 40 pulmonary veins were mapped, 16 of which had local ectopic activity, related or not with the triggering of atrial fibrillation paroxysms. At the end of each procedure, suppression of arrhythmias was obtained in 8 patients, and elimination of pulmonary vein potentials was accomplished in 4. During the clinical follow-up of 9.6 + or - 3 months, 7 patients remained in sinus rhythm, 5 of whom were using antiarrhythmic drugs that had previously been ineffective. None of the patients had pulmonary hypertension or evidence of stenosis in the pulmonary veins. CONCLUSION: Selective and simultaneous catheterization of the 4 pulmonary veins with microcatheters for simultaneous recording of their electrical activity is a feasible and safe procedure that may help ablation of atrial fibrillation

Ablaçäo de via acessória lateral esquerda oculta durante o encarrilhamento de taquicardia atrioventricular ortodrômica: um modo de manter a estabilidade do cateter de ablaçäo durante aplicaçäo de radiofrequência / Radiofrequency ablation of concealed left accessory pathway during entrainment of orthodromic reciprocating tachycardia: a estrategy to keep the stability of the catheter

A ablaçäo por radiofrequência de via acessória lateral esquerda é frequentemente realizada durante a taquicardia ortodrômica. O término da taquicardia durante a aplicaçäo de radiofrequência pode causar instabilidade do cateter de ablaçäo. A aplicaçäo da radiofrequência durante o encarrilhamento da taquicardia mantém a frequência ventricular constante, conferindo maior estabilidade ao cateter e maior eficácia ao procedimento.