Abstract:
OBJECTIVE:To study electrophysiological characteristics that enable the identification and ablation of sites of chagasic tachycardia. METHODS:Thirty-one patients with chronic Chagas' heart disease and sustained ventricular tachycardia (SVT) underwent electrophysiological study to map and ablate that arrhythmia. Fifteen patients had hemodynamically stable SVT reproducible by programmed ventricular stimulation, 9 men and 6 women with ages ranging from 37 to 67 years and ejection fraction varying from 0.17 to 0.64. Endocardial mapping was performed during SVT in all patients. Radiofrequency (RF) current was applied to sites of presystolic activity of at least 30 ms. Entrainment was used to identify reentrant circuits. In both successful and unsuccessful sites of RF current application, electrogram and entrainment were analyzed. RESULTS:Entrainment was obtained during all mapped SVT. In 70.5% of the sites we observed concealed entrainment and ventricular tachycardia termination in the first 15 seconds of RF current application. In the unsuccessful sites, significantly earlier electrical activity was seen than in the successful ones. Concealed entrainment was significantly associated with ventricular tachycardia termination. Bystander areas were not observed. CONCLUSION:The reentrant mechanism was responsible for the genesis of all tachycardias. In 70.5% of the studied sites, the endocardial participation of the slow conducting zone of reentrant circuits was shown. Concealed entrainment was the main electrophysiological parameter associated with successful RF current application. There was no electrophysiological evidence of bystander regions in the mapped circuits of SVT.
journal_name
Arq Bras Cardioljournal_title
Arquivos brasileiros de cardiologiaauthors
Távora MZ,Mehta N,Silva RM,Gondim FA,Hara VM,de Paola AAdoi
10.1590/s0066-782x1999000400006subject
Has Abstractpub_date
1999-04-01 00:00:00pages
451-74issue
4eissn
0066-782Xissn
1678-4170journal_volume
72pub_type
杂志文章abstract:PURPOSE:To evaluate the results with the use of an automatic antitachycardia pacemaker in patients with refractory paroxysmal supraventricular tachycardia. PATIENTS AND METHODS:Nine patients aged 32 to 63 years with symptoms from 2 to more than 40 years and prophylactic treatment with several antiarrhythmic drugs that...
journal_title:Arquivos brasileiros de cardiologia
pub_type: 杂志文章
doi:
更新日期:1991-04-01 00:00:00
abstract::We presented two cases of falsely elevated CK-MB due to the presence of a type 2 macro CK, showed by isoenzymes electrophoresis. The association of this CK-MB falsely elevated with some digestive diseases are frequent. Quantification of CK isoenzymes by electrophoresis could be indicated in those cases in which the cl...
journal_title:Arquivos brasileiros de cardiologia
pub_type: 杂志文章
doi:
更新日期:1994-10-01 00:00:00
abstract::Cardiovascular diseases (CVD) are a major cause of death in developed countries as well as in developing countries. In general, the clinical manifestations of CVD, such as myocardial infarction, stroke and peripheral vascular disease, are caused by an atherosclerotic process with onset as from the middle age. However,...
journal_title:Arquivos brasileiros de cardiologia
pub_type: 杂志文章,评审
doi:10.1590/s0066-782x2008000400012
更新日期:2008-04-01 00:00:00
abstract:PURPOSE:To verify the efficacy and safety of the creation of a barrier with radiofrequency (RF) in the tricuspid annulus and the vena cava ostium (TA-IVC). METHODS:Nine consecutive patients, 7 males, with age ranging from 36 to 76 years, with paroxysmal (7 patients) or permanent (2) type I atrial flutter (negative P w...
journal_title:Arquivos brasileiros de cardiologia
pub_type: 临床试验,杂志文章
doi:
更新日期:1994-09-01 00:00:00
abstract::For purposes of studying left ventricular mechanics, 184 chronic chagasic and 85 primary cardiomyopathy patients were submitted to an extensive invasive (LV cine, right and left cardiac catheterization and coronarography) and non-invasive protocol. The afterload, (mean wall stress), the contractile status (ejection fr...
journal_title:Arquivos brasileiros de cardiologia
pub_type: 杂志文章
doi:
更新日期:1989-07-01 00:00:00
abstract::Total generalized lipodystrophy (Berardinelli - Seip Syndrome) is a rare hereditary disease characterized by insulin-resistant diabetes mellitus and a small quantity of adipose tissue and is of unknown origin. Common cardiovascular alterations related to this syndrome are cardiac hypertrophy and arterial hypertension....
journal_title:Arquivos brasileiros de cardiologia
pub_type: 杂志文章,评审
doi:10.1590/s0066-782x2000000900006
更新日期:2000-09-01 00:00:00
abstract:OBJECTIVE:To assess balloon atrial septostomy monitored with echocardiography. METHODS:From August 1997 to January 2004, 31 infants with congenital heart diseases indicated for balloon atrial septostomy underwent the procedure with exclusive echocardiographic monitoring. Success was defined as the obtainment of an atr...
journal_title:Arquivos brasileiros de cardiologia
pub_type: 杂志文章
doi:10.1590/s0066-782x2005000300010
更新日期:2005-03-01 00:00:00
abstract::A case of pulmonary atresia with intact ventricular septum and a hypoplastic right ventricle, with three wall formed portions, that became naturally well developed until 2 years of age, is related. A Blalock-Taussig shunt had been performed early in life. Z value of tricuspid valve of 0.3 and left ventricular in ECG h...
journal_title:Arquivos brasileiros de cardiologia
pub_type: 杂志文章
doi:
更新日期:1995-01-01 00:00:00
abstract:BACKGROUND:The presence of nerves in heart valves was first depicted decades ago and identified into subpopulations: sympathetic, parasympathetic. So valves are expected to be greatly affected by the autonomic nerves. However, few studies have focused on the regulation of heart valves by the autonomic nervous system. ...
journal_title:Arquivos brasileiros de cardiologia
pub_type: 杂志文章
doi:10.1590/s0066-782x2012000400006
更新日期:2012-04-01 00:00:00
abstract:OBJECTIVE:To determine the prevalence of hyperhomocystinemia in patients with acute ischemic syndrome of the unstable angina type. METHODS:We prospectively studied 46 patients (24 females) with unstable angina and 46 control patients (19 males), paired by sex and age, blinded to the laboratory data. Details of diets, ...
journal_title:Arquivos brasileiros de cardiologia
pub_type: 临床试验,杂志文章
doi:10.1590/s0066-782x2002001100008
更新日期:2002-08-01 00:00:00
abstract:BACKGROUND:Although thrombolysis and primary CTA are well-established procedures, they are not administered in a large proportion of the patients with STEMI who arrive to the emergency rooms. OBJECTIVE:Describe initial and final the results in a cohort of STEMI patients METHODS:The study included, from hospital admis...
journal_title:Arquivos brasileiros de cardiologia
pub_type: 杂志文章
doi:10.1590/s0066-782x2009000600009
更新日期:2009-06-01 00:00:00
abstract:PURPOSE:To detect myocardial ischemia during dobutamine stress echocardiography (DSE). METHODS:Two hundred and seventy one patients were studied; 63 (23%) underwent coronary angiography within a month of DSE. Angiograms were analyzed independently by 3 angiographers, and coronary lesions larger than 50% of luminal occ...
journal_title:Arquivos brasileiros de cardiologia
pub_type: 杂志文章
doi:
更新日期:1993-04-01 00:00:00
abstract::Constrictive chronic pericarditis in a 13-year-old male patient was previously treated as chronic hepatitis for seven years, with the use of furosemide and spironolactone. Investigation for diagnosis included chest radiography, echo-doppler-cardiography, thoracocentesis with pleural biopsy and computerized tomography ...
journal_title:Arquivos brasileiros de cardiologia
pub_type: 杂志文章
doi:
更新日期:1991-12-01 00:00:00
abstract:BACKGROUND:Cardiac tumors are rare, mostly benign with high embolic potential. OBJECTIVES:To correlate the histological type of cardiac masses with their embolic potential, implantation site and long term follow up in patients undergoing surgery. METHODS:Between January 1986 and December 2011, we retrospectively anal...
journal_title:Arquivos brasileiros de cardiologia
pub_type: 杂志文章
doi:10.5935/abc.20140096
更新日期:2014-07-01 00:00:00
abstract:OBJECTIVE:To compare blood pressure, lipid profile, food intake, and anthropometric data of adolescents with or without a familial history of hypertension. METHODS:Forty-three adolescents from both sexes were assessed, with ages ranging from 11 to 18 years old. Twenty had hypertensive parents, and 23 had normotensive ...
journal_title:Arquivos brasileiros de cardiologia
pub_type: 杂志文章
doi:10.1590/s0066-782x2004000200005
更新日期:2004-02-01 00:00:00
abstract:BACKGROUND:In clinical tests, the Informed Consent is critical to preserve the ethics, but due to its high complexity level, it cannot be fully understood. This study assesses the Informed Consent as viewed by patients. OBJECTIVE:We addressed the issue of what do patients understand about the studies based on the IC. ...
journal_title:Arquivos brasileiros de cardiologia
pub_type: 杂志文章
doi:10.1590/s0066-782x2010000100003
更新日期:2010-01-01 00:00:00
abstract:BACKGROUND:The arterial hypertension varies in according to the circadian cycle, presenting physiologic fall of blood pressure (BP) during sleep (dipping). The absence of this fall or its increase associates to higher incidence of target-organ damages. OBJECTIVE:To analyze the prevalence of dipping in hypertensive ind...
journal_title:Arquivos brasileiros de cardiologia
pub_type: 杂志文章
doi:10.1590/s0066-782x2010000100013
更新日期:2010-01-01 00:00:00
abstract:BACKGROUND:Congenital heart defects (CHD), as the most common congenital anomaly, have been reported to be associated with chromosomal abnormalities. Currently, patients with CHD are routinely offered karyotyping and chromosomal microarray (CMA) testing, but the genotype-phenotype relationship has not yet been fully es...
journal_title:Arquivos brasileiros de cardiologia
pub_type: 杂志文章
doi:10.5935/abc.20180144
更新日期:2018-10-01 00:00:00
abstract:BACKGROUND:Studies have shown that pre/postnatal undernutrition leads to higher risk of non communicable diseases such as diabetes, hypertension and obesity in adulthood. OBJECTIVE:To determine whether overweight adolescents with mild stunting [height-for-age Z scores (HAZ) in the range <-1 to ≥ -2] have higher blood ...
journal_title:Arquivos brasileiros de cardiologia
pub_type: 杂志文章
doi:10.1590/s0066-782x2011005000115
更新日期:2012-01-01 00:00:00
abstract:BACKGROUND:The standardization of images used in Medicine in 1993 was performed using the DICOM (Digital Imaging and Communications in Medicine) standard. Several tests use this standard and it is increasingly necessary to design software applications capable of handling this type of image; however, these software appl...
journal_title:Arquivos brasileiros de cardiologia
pub_type: 杂志文章
doi:10.1590/s0066-782x2012005000089
更新日期:2012-10-01 00:00:00
abstract:PURPOSE:To evaluate the influence of age on response to pravastatin treatment in patients treated by community physicians. METHODS:According to age, 873 patients were divided in three groups: group A with ages ranging from 45 to 59 years (n = 55), group B with ages from 60 to 64 years (n = 182) and group C with ages f...
journal_title:Arquivos brasileiros de cardiologia
pub_type: 临床试验,杂志文章
doi:
更新日期:1996-08-01 00:00:00
abstract:PURPOSE:To compare the efficacy of carvedilol, a new antihypertensive drug that combines vasodilatory and beta-blocker properties, with nifedipine. METHODS:In a multicenter double-blind trial, 106 mild to moderate essential hypertensive patients were treated with either carvedilol (n = 51), or nifedipine (n = 55) as m...
journal_title:Arquivos brasileiros de cardiologia
pub_type: 临床试验,杂志文章,多中心研究,随机对照试验
doi:
更新日期:1994-11-01 00:00:00
abstract:BACKGROUND:Atrial fibrillation (AF) is a cardiac arrhythmia with high risk for thromboembolic events, specially stroke. OBJECTIVE:To assess the safety of left atrial appendage closure (LAAC) with the Amplatzer Cardiac Plug for the prevention of thromboembolic events in patients with nonvalvular AF. METHODS:This study...
journal_title:Arquivos brasileiros de cardiologia
pub_type: 杂志文章
doi:10.5935/abc.20170167
更新日期:2017-12-01 00:00:00
abstract::Background: To alert for the diagnosis of the 22q11.2 deletion syndrome (22q11.2DS) in patients with congenital heart disease (CHD). Objective: To describe the main CHDs, as well as phenotypic, metabolic and immunological findings in a series of 60 patients diagnosed with 22q11.2DS. Methods: The study included 60 pati...
journal_title:Arquivos brasileiros de cardiologia
pub_type: 杂志文章
doi:10.5935/abc.20140145
更新日期:2014-11-01 00:00:00
abstract:BACKGROUND:Several studies have demonstrated clinical benefits of fish consumption for the cardiovascular system. These effects are attributed to the increased amounts of polyunsaturated fatty acids in these foods. However, the concentrations of fatty acids may vary according to region. OBJECTIVE:The goal of this stud...
journal_title:Arquivos brasileiros de cardiologia
pub_type: 杂志文章
doi:10.5935/abc.20140176
更新日期:2015-02-01 00:00:00
abstract:BACKGROUND:The determination of the prevalence of electrocardiographic alterations in the older age strata of the Brazilian population represents important information with clinical and epidemiological purpose. OBJECTIVE:To verify the prevalence rates of atrial fibrillation, enlarged Q/QS waves (Minnesota code 1.1-1.2...
journal_title:Arquivos brasileiros de cardiologia
pub_type: 杂志文章
doi:10.1590/s0066-782x2009001200015
更新日期:2009-12-01 00:00:00
abstract:BACKGROUND:Sudden death is the leading cause of death in Chagas disease (CD), even in patients with preserved ejection fraction (EF), suggesting that destabilizing factors of the arrhythmogenic substrate (autonomic modulation) contribute to its occurrence. OBJECTIVE:To determine baroreflex sensitivity (BRS) in patient...
journal_title:Arquivos brasileiros de cardiologia
pub_type: 杂志文章
doi:10.5935/abc.20140066
更新日期:2014-06-01 00:00:00
abstract::Due to the increasing use of the cardiac magnetic resonance (CMR) method and the frequent implementation of such method in new services, we describe herein, in a step-by-step format, the acquisition techniques that are necessary for a complete cardiac approach, of the main anatomical planes of the heart used by CMR. ...
journal_title:Arquivos brasileiros de cardiologia
pub_type: 杂志文章,评审
doi:10.1590/s0066-782x2010001600014
更新日期:2010-12-01 00:00:00
abstract::Blood pressure (BP)-lowering therapy improves left ventricular (LV) parameters of hypertensive target-organ damage in stage II hypertension, but whether there is a drug-class difference in echocardiographic parameters in stage I hypertension patients is less often studied. In the PREVER treatment study, where individu...
journal_title:Arquivos brasileiros de cardiologia
pub_type: 杂志文章,多中心研究,随机对照试验
doi:10.5935/abc.20180249
更新日期:2019-01-01 00:00:00
abstract:OBJECTIVE:To evaluate the anti-hypertensive effect of verapamil COER-24 180/240 mg in a single dose at bedtime as single therapy in mild to moderate hypertensives. METHODS:A multicentric, open, placebo controlled study of 81 hypertensive patients older than 20 years-old followed to 8 weeks. Blood pressure was measured...
journal_title:Arquivos brasileiros de cardiologia
pub_type: 临床试验,杂志文章,多中心研究
doi:10.1590/s0066-782x2000000300009
更新日期:2000-03-01 00:00:00