Your browser doesn't support javascript.
loading
Show: 20 | 50 | 100
Results 1 - 7 de 7
Filter
1.
Ann Noninvasive Electrocardiol ; 24(5): e12650, 2019 09.
Article in English | MEDLINE | ID: mdl-30993813

ABSTRACT

BACKGROUND: The differential diagnosis of a supraventricular tachycardia (SVT) is accomplished using a number of pacing maneuvers. The incidence and mechanism of a single ventricular premature beat (VPB) on initiation and termination of tachycardia were evaluated during programmed electrical stimulation (PES) of the heart in patients with the two most common regular SVTs: atrioventricular re-entrant tachycardia (AVNRT) and orthodromic atrioventricular tachycardia (AVRT). METHODS: Three hundred and thirty-seven consecutive patients aged above 18 years with an inducible sustained AVNRT or AVRT were prospectively enrolled. Patients with more than one tachyarrhythmia mechanism were excluded. Two hundred and seventeen patients (64.4%) had typical slow/fast AVNRT and 120 (35.6%) had an orthodromic AVRT using a rapidly conducting accessory pathway for V-A conduction. In this cross-sectional study, we specifically report the analysis of tachycardia induction and termination by a single VPB. RESULTS: Tachycardia induction with a single VPB during sinus rhythm was seen in 7 of 120 AVRT and in only one of the 217 patients with AVNRT, (5.8% vs. 0.3%, p < 0.05). When a single VPB was delivered during basic ventricular pacing these values were 28% versus 4%, respectively, (p < 0.001). Termination of tachycardia by a single VPB was observed in nine (4.1%) patients with AVNRT and in 57 (47.5%) with AVRT (p < 0.001). CONCLUSION: Initiation of SVT by a single VPB during sinus rhythm was uncommon and favored AVRT. Termination of SVT by a single VPB was commonly seen in AVRT but rarely in AVNRT. These findings can be of help when interpreting a noninvasive arrhythmia event recording.


Subject(s)
Electrocardiography , Tachycardia, Supraventricular/etiology , Tachycardia, Supraventricular/physiopathology , Ventricular Premature Complexes/complications , Ventricular Premature Complexes/physiopathology , Adult , Cross-Sectional Studies , Diagnosis, Differential , Female , Humans , Male , Middle Aged , Prospective Studies
2.
Rev. chil. cardiol ; 37(2): 110-114, ago. 2018. ilus
Article in Spanish | LILACS | ID: biblio-959348

ABSTRACT

Resumen: Se presenta el caso de un hombre de 79 años con miocardiopatía dilatada severa, disfunción ventricular izquierda, fibrilación auricular permanente y portador de un resincronizador ventricular. Al efectuar un recambio del resincronizador se implantó un electrodo adicional para estimulación multisitio del ventrículo izquierdo. Ello condujo a significativa mejoría clínica y de la fracción de eyección del ventrículo izquierdo.


Abstract: A 79-year-old man with dilated cardiomyopathy and atrial fibrillation undergoing resynchronization therapy had and additional electrode implanted in the left ventricle. Multi-site stimulation led to an improved functional class and left ventricular ejection fraction.


Subject(s)
Humans , Male , Aged , Atrial Fibrillation/therapy , Cardiac Resynchronization Therapy/methods , Heart Failure/therapy , Atrial Fibrillation/diagnosis , Radiography, Thoracic , Electrocardiography , Electrodes, Implanted , Heart Failure/diagnosis
4.
Rev Med Chil ; 131(10): 1101-10, 2003 Oct.
Article in Spanish | MEDLINE | ID: mdl-14692298

ABSTRACT

BACKGROUND: Intraventricular resynchronization with pacemakers is a promising therapy for patients with refractory cardiac failure and intraventricular conductions delay. However its long term effects are not well known. AIM: To report the results of this therapy in patients with cardiac failure. PATIENTS AND METHODS: Fourteen patients (11 male), whose mean age was 68 years, with a severe and refractory cardiac failure, have been treated in our unit using intraventricular resynchronization with pacemakers. Eight had a coronary heart disease and six a dilated myocardiopathy. The pacemaker was implanted transvenously, with conventional stimulation in atrium and right ventricle. The left ventricle was stimulated through an epicardial vein, accessed through the coronary sinus. RESULTS: In one patient the high thresholds did not allow a left ventricular stimulation. In the other 13 patients, a clinical improvement was observed in 11 (85%), that has been sustained for a mean of 8.2 months. The ejection fraction improved form 23.5 to 32.4% (p < 0.001), the 6 min walking test improved from 347 to 437 m (p = 0.003) and the functional capacity changes from 3.3 to 2.7 (p < 0.001). Three patients died during follow up. One was the patient in whom the stimulation failed and two had a sudden death. No complications of the procedure were observed. CONCLUSIONS: In this series, intraventricular resynchronization with pacemakers was effective in 11 of 13 patients, improving functional capacity and ejection fraction. Sudden death could be avoided adding a defibrillator to the pacemaker system.


Subject(s)
Cardiac Pacing, Artificial/methods , Cardiomyopathy, Dilated/therapy , Aged , Aged, 80 and over , Coronary Disease/therapy , Female , Humans , Male , Middle Aged , Pacemaker, Artificial , Stroke Volume , Treatment Outcome , Ventricular Dysfunction/physiopathology
5.
Rev Med Chil ; 130(5): 482-94, 2002 May.
Article in Spanish | MEDLINE | ID: mdl-12143268

ABSTRACT

BACKGROUND: Atrial fibrillation can originate in arrhythmogenic foci coming from the pulmonary veins. Patients with atrial fibrillation, initiated from triggering foci, can be treated with radiofrequency ablation. AIM: To report the results of radiofrequency ablation in patients with focal atrial fibrillation. PATIENTS AND METHODS: Thirteen patients with focal atrial fibrillation (8 male, aged 19 to 60 years old) are reported. Twelve had frequent crises refractory to antiarrhythmic drugs. Two had also flutter and tachycardia. One had a permanent atrial fibrillation lasting five years. Two had ventricular dysfunction and left atrial dilatation. The triggering focus was identified during the electrophysiological study, by the precocity of the potential that initiated the atrial fibrillation. RESULTS: All patients had early atrial extrasystolic beats, isolated or repetitives, that preceded atrial fibrillation. During the electrophysiological study, 18 foci (3 in the right and 15 in the left atrium all in pulmonary veins) were identified. Radiofrequency ablation had immediate success in 11 patients. In 5, a flutter was also ablated. One patient had a sinus dysfunction after the procedure and atrial fibrillation was not eliminated. In this and other patient in whom the procedure failed, a pacemaker was implanted and the atrioventricular node was blocked. In a follow up, ranging from 4 to 31 months, eight patients are asymptomatic and 3 recidivated. No complications have been detected. CONCLUSIONS: Patients with focal atrial fibrillation have common clinical and electrocardiographic features. Radiofrequency ablation of the triggering focus is possible and effective in most cases.


Subject(s)
Atrial Fibrillation/surgery , Catheter Ablation , Adult , Atrial Fibrillation/physiopathology , Electrocardiography , Female , Follow-Up Studies , Humans , Male , Middle Aged , Pulmonary Veins/physiopathology , Treatment Outcome
7.
Rev. chil. obstet. ginecol ; 61(2): 116-9, 1996. ilus
Article in Spanish | LILACS | ID: lil-174928

ABSTRACT

Presentamos un caso clínico de taquicardia supraventricular fetal complicado con hidrops fetalis diagnosticado a las 27 semans de gestación por medio de ecocardiografía fetal. Se realizó tratamiento in utero con digitálicos por vía materna con remisión de la TSV y del hidrops fetalis. A las 34 semanas se obtiene un RN sano con control electrocardiográfico continuo normal


Subject(s)
Humans , Female , Pregnancy , Adult , Hydrops Fetalis , Tachycardia, Supraventricular , Ultrasonography, Prenatal/methods , Digitalis Glycosides/administration & dosage , Tachycardia, Supraventricular/drug therapy
SELECTION OF CITATIONS
SEARCH DETAIL
...