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1.
Open Heart ; 7(1): e001199, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32153792

RESUMO

Objectives: The physiological determinants of left ventricular (LV) mechanical dispersion (MD) are not fully explored. We aimed to investigate the impact of afterload reduction and changes in ventricular conduction on LV MD after transcatheter aortic valve implantation (TAVI). Methods: Patients with severe aortic stenosis (AS) were examined in a prospective, repeated measures observational cohort study before and after an uncomplicated transfemoral TAVI in a single tertiary centre. LV MD was assessed by speckle tracking echocardiography. Valvulo-arterial impedance (ZVA) was used as a measure of global afterload. Results: We included 140 consecutive patients (83±8 years old, 49% women, logistic EuroSCORE 16±10) with severe AS (valve area 0.7±0.2 cm2, mean transvalvular gradient 54±18 mm Hg) and a relatively preserved LV ejection fraction (52%±11%). After TAVI, we observed favourable changes in transvalvular gradients and ZVA in all patients. Compared with baseline, postprocedural MD was significantly lower in 108 patients with unchanged ventricular conduction (55±17 ms vs 51±17 ms, p=0.02) and higher in 28 patients with TAVI-induced left bundle branch block (51±13 ms vs 62±19 ms, p≤0.001). During 22±9 months observation, 22 patients died. Postprocedural MD was associated with mortality in a univariate Cox regression model (HR=1.24 (1.01-1.52), p<0.04, per 10 ms increase). Conclusions: Isolated afterload reduction was associated with reduction of MD, while concomitant impairment of ventricular conduction resulted in a more pronounced MD after TAVI, indicating that loading conditions and conduction should be considered when evaluating MD. A pronounced postprocedural LV MD was associated with mortality.


Assuntos
Potenciais de Ação , Estenose da Valva Aórtica/cirurgia , Valva Aórtica/cirurgia , Bloqueio de Ramo/etiologia , Frequência Cardíaca , Substituição da Valva Aórtica Transcateter/efeitos adversos , Disfunção Ventricular Esquerda/etiologia , Função Ventricular Esquerda , Idoso , Idoso de 80 Anos ou mais , Valva Aórtica/diagnóstico por imagem , Valva Aórtica/fisiopatologia , Estenose da Valva Aórtica/diagnóstico por imagem , Estenose da Valva Aórtica/mortalidade , Estenose da Valva Aórtica/fisiopatologia , Bloqueio de Ramo/diagnóstico , Bloqueio de Ramo/mortalidade , Bloqueio de Ramo/fisiopatologia , Ecocardiografia , Eletrocardiografia , Feminino , Próteses Valvulares Cardíacas , Humanos , Masculino , Estudos Prospectivos , Fatores de Risco , Índice de Gravidade de Doença , Fatores de Tempo , Substituição da Valva Aórtica Transcateter/instrumentação , Substituição da Valva Aórtica Transcateter/mortalidade , Resultado do Tratamento , Disfunção Ventricular Esquerda/diagnóstico por imagem , Disfunção Ventricular Esquerda/mortalidade , Disfunção Ventricular Esquerda/fisiopatologia
2.
Am Heart J ; 221: 125-135, 2020 03.
Artigo em Inglês | MEDLINE | ID: mdl-31986289

RESUMO

BACKGROUND: The rate-limiting step in STEMI diagnosis often is the availability of a 12-lead electrocardiogram (ECG) and its interpretation. The potential may exist to speed the availability of 12-lead ECG information by using commonly available mobile technologies. We sought to test whether combining serial smartphone single-lead ECGs to create a virtual 12-lead ECG can accurately diagnose STEMI. METHODS: Consenting patients presenting with symptoms consistent with a possible STEMI had contemporaneous standard 12-lead and smartphone '12-lead equivalent' ECG (produced by electronically combining serial single-lead ECGs) recordings obtained. Matched ECGs were evaluated qualitatively and quantitatively by a panel of blinded readers and classified as STEMI/STEMI equivalent (LBBB), Not-STEMI, or uninterpretable. Interpretable ECG pairs were graded as showing good, fair, or poor correlation. RESULTS: Two hundred four subjects (age = 60 years, males = 57%, STEMI activation = 45%) were enrolled from 5 international sites. Smartphone ECG quality was graded as good in 151 (74.0%), fair in 32 (15.7%), poor in 8 (3.9%), and uninterpretable in 13 (6.4%). A STEMI/STEMI equivalent diagnosis was identified by standard 12-lead ECG in 57/204 (27.9%) recordings. For all interpretable pairs of smartphone ECGs compared with standard ECGs (n = 190), the sensitivity, specificity, and positive and negative predictive values for STEMI/STEMI equivalent by smartphone were 0.89, 0.84, 0.70 and 0.95, respectively. CONCLUSIONS: A '12-lead equivalent' ECG obtained from multiple serial single-lead ECGs from a smartphone can identify STEMI with good correlation to a standard 12-lead ECG. This technology holds promise to improve outcomes in STEMI by enhancing the reach and speed of diagnosis and thereby early treatment.


Assuntos
Eletrocardiografia/métodos , Infarto do Miocárdio com Supradesnível do Segmento ST/diagnóstico , Smartphone , Adulto , Idoso , Idoso de 80 Anos ou mais , Bloqueio de Ramo/diagnóstico , Eletrocardiografia/instrumentação , Estudos de Viabilidade , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Sensibilidade e Especificidade , Adulto Jovem
3.
Isr Med Assoc J ; 12(21): 790-795, 2019 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-31814341

RESUMO

BACKGROUND: Patients with right bundle branch block (RBBB) prior to transcatheter aortic valve implantation (TAVI) are at high risk for immediate post-procedural heart block and long-term mortality when discharged without a pacemaker. OBJECTIVES: To test whether prophylactic permanent pacemaker implantation (PPI) is beneficial. METHODS: Of 795 consecutive patients who underwent TAVI, 90 patients had baseline RBBB. We compared characteristics and outcomes of the prophylactic PPI with post-TAVI PPI. Need for pacing was defined as  greater than 1% ventricular pacing. RESULTS: Forty patients with RBBB received a prophylactic PPI (group 1), and in 50 the decision was based on standard post-procedural indications (group 2). There were no significant differences in clinical baseline characteristics. One patient developed a tamponade after a PPI post-TAVI. A trend toward shorter hospitalization duration in group 1 patients was observed (P = 0.06). On long-term follow-up of 848 ± 56 days, no differences were found in overall survival (P = 0.77), the composite event-free survival of both mortality and hospitalizations (P = 0.66), or mortality and syncope (P = 0.65). On multivariate analysis, independent predictors of the need for pacing included baseline PR interval increase of 10ms (odds ratio [OR] 1.21 per 10 ms increment 95% confidence interval [95%CI] 1.02-1.44, P = 0.028), and the use of new generation valves (OR 3.92, 95%CI 1.23-12.46, P = 0.023). CONCLUSIONS: In patients with baseline pre-TAVI RBBB, no outcome differences were found with prophylactic PPI. On multivariate analysis, predictors of the need for pacing included baseline long PR interval, and the use of newer generation valves.


Assuntos
Bloqueio de Ramo , Estimulação Cardíaca Artificial , Complicações Pós-Operatórias , Cuidados Pré-Operatórios/métodos , Substituição da Valva Aórtica Transcateter , Idoso , Idoso de 80 Anos ou mais , Estenose da Valva Aórtica/epidemiologia , Estenose da Valva Aórtica/cirurgia , Bloqueio de Ramo/diagnóstico , Bloqueio de Ramo/terapia , Estimulação Cardíaca Artificial/métodos , Estimulação Cardíaca Artificial/estatística & dados numéricos , Feminino , Humanos , Israel/epidemiologia , Tempo de Internação/estatística & dados numéricos , Masculino , Mortalidade , Avaliação de Processos e Resultados em Cuidados de Saúde , Marca-Passo Artificial , Complicações Pós-Operatórias/mortalidade , Complicações Pós-Operatórias/prevenção & controle , Utilização de Procedimentos e Técnicas/estatística & dados numéricos , Substituição da Valva Aórtica Transcateter/efeitos adversos , Substituição da Valva Aórtica Transcateter/métodos
6.
Int Heart J ; 60(5): 1196-1200, 2019 Sep 27.
Artigo em Inglês | MEDLINE | ID: mdl-31484862

RESUMO

Malignant arrhythmia is a fast cardiac arrhythmia that can lead to a hemodynamic abnormality within a short time, most of which is ventricular tachycardia or ventricular fibrillation (VF), which should be managed in time. Both organic and nonorganic cardiac diseases have the potential to cause malignant arrhythmia. We report a noteworthy case of malignant arrhythmia in a teenager during exercise. Transthoracic echocardiography, cardiac magnetic resonance (CMR), electrophysiological study, magnetic resonance imaging of the brain, electroencephalography, chest X-ray, and blood tests were all normal. Twelve-lead electrocardiography showed incomplete right bundle branch block (IRBBB). Two heterozygous missense variants of the desmocollin-2 gene (DSC2, c.G2446A/p.V816M) and desmoplakin gene (DSP, c.G3620A/p.R1207K) were detected in the peripheral blood of this teenager and his father by genetic testing, which encoded a desmosomal protein that was related to arrhythmogenic right ventricular cardiomyopathy (ARVC). In these two rare variants, DSC2 V816M has been reported but uncertain significance, whereas DSP R1207K is never reported. Therefore, the two site variants in DSC2 and DSP genes are likely to become a new research focus for diagnosis and treatment of ARVC in the future. Meanwhile, this report emphasizes that, in addition to a standard set of laboratory tests and examinations, genetic testing may be useful for analyzing the causes of malignant arrhythmia.


Assuntos
Arritmias Cardíacas/etiologia , Bloqueio de Ramo/genética , Desmocolinas/genética , Eletrocardiografia/métodos , Predisposição Genética para Doença , Adolescente , Arritmias Cardíacas/diagnóstico , Arritmias Cardíacas/genética , Bloqueio de Ramo/complicações , Bloqueio de Ramo/diagnóstico , Ecocardiografia/métodos , Testes Genéticos/métodos , Humanos , Masculino , Linhagem , Prognóstico , Doenças Raras , Medição de Risco , Índice de Gravidade de Doença
7.
Medicine (Baltimore) ; 98(32): e16642, 2019 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-31393361

RESUMO

RATIONALE: Tachycardia-induced cardiomyopathy (TIC) is defined as systolic and/or diastolic dysfunction of the left ventricle resulting from prolonged elevated heart rates, completely reversible upon control of the arrhythmia. Atrioventricular reentrant tachycardia (AVRT) is one of the most frequent causes of TIC. In its incessant form, it is unlikely to be controlled by pharmacological treatment, catheter ablation being the principal therapeutic option. The coexistence of left bundle branch block (LBBB) in patients with AVRT may cause difficulties in the early diagnosis and management of tachycardia because of the wide complex morphology, making it harder to localize the accessory pathway (AP). PATIENT CONCERNS: A 60-year-old woman, presented incessant episodes of palpitations and shortness of breath due to a LBBB tachycardia leading to hemodynamic instability. DIAGNOSIS: The patient had a wide QRS tachycardia, with LBBB morphology and a heart rate of 160/minute. Echocardiography showed global hypokinesia with 25% left ventricular ejection fraction (LVEF). Considering the patient's clinical picture, TIC was suspected. INTERVENTIONS: The electrophysiological study revealed a left lateral accessory pathway. Catheter ablation was successfully performed at the level of the lateral mitral ring. OUTCOMES: One week after the ablation the patient had no signs of heart failure and the LVEF normalized to 55%. During 6-months follow-up the patient presented no more episodes of tachycardia or heart failure and the LVEF remained normal. LESSONS: AVRT is rarely associated with intrinsic LBBB, being a potential cause of TIC. In these patients, it is unlikely to control the arrhythmia pharmacologically, catheter ablation being the best therapeutic option. The variation of QRS complex duration between LBBB pattern in SR and AVRT could be useful for early diagnosis of an ipsilateral AP on surface ECG.


Assuntos
Bloqueio de Ramo/cirurgia , Ablação por Cateter/métodos , Taquicardia por Reentrada no Nó Atrioventricular/cirurgia , Bloqueio de Ramo/complicações , Bloqueio de Ramo/diagnóstico , Cardiomiopatias/diagnóstico , Cardiomiopatias/etiologia , Ecocardiografia , Eletrocardiografia , Frequência Cardíaca , Humanos , Masculino , Pessoa de Meia-Idade , Volume Sistólico , Taquicardia por Reentrada no Nó Atrioventricular/complicações
8.
BMJ Case Rep ; 12(8)2019 Aug 20.
Artigo em Inglês | MEDLINE | ID: mdl-31434668

RESUMO

We present the case of a 65-year-old woman who was referred urgently from primary care with worsening breathlessness for 3 weeks, associated with tachycardia and left bundle branch block (LBBB). She had a background of type 2 diabetes, asthma and hypertension. Initial ECG revealed atrial fibrillation with the fast ventricular rate on the background of LBBB. ECHO findings were consistent with systolic impairment. Initial testing including checking thyroid function test revealed hyperthyroidism. It became evident that this patient had thyrotoxic cardiomyopathy. Early advice from the endocrine team was sought and the patient was treated with a combination of carbimazole and ivabradine. After a hospital stay, she made a remarkable recovery.


Assuntos
Bloqueio de Ramo/diagnóstico , Cardiomiopatias/diagnóstico , Anti-Hipertensivos/uso terapêutico , Bisoprolol/uso terapêutico , Bloqueio de Ramo/tratamento farmacológico , Bloqueio de Ramo/fisiopatologia , Carbimazol/uso terapêutico , Cardiomiopatias/tratamento farmacológico , Cardiomiopatias/fisiopatologia , Diabetes Mellitus Tipo 2 , Dispneia , Eletrocardiografia , Feminino , Humanos , Pessoa de Meia-Idade , Taquicardia , Resultado do Tratamento
9.
Arch Cardiol Mex ; 89(1): 20-25, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31448761

RESUMO

A new or presumably new left bundle branch block along with ischemic symptoms has traditionally been considered an electrocardiographic equivalent of ST-segment elevation myocardial infarction, which should be brought to emergent reperfusion. However, several criteria have been proposed for its definition, but none has reached out an optimal diagnostic yield. Below we detail these criteria, their main problems and the advantages they have shown.


Assuntos
Bloqueio de Ramo/diagnóstico , Eletrocardiografia , Infarto do Miocárdio com Supradesnível do Segmento ST/diagnóstico , Diagnóstico Diferencial , Humanos
10.
Am J Emerg Med ; 37(10): 1992.e1-1992.e3, 2019 10.
Artigo em Inglês | MEDLINE | ID: mdl-31387810

RESUMO

Emergency department presentations of syncope can vary from benign to life-threatening etiologies. Older patients are at increased risk of cardiac causes of syncope. Ventricular standstill is a rare phenomenon that can manifest as syncope and must be correctly identified and promptly treated to prevent sudden cardiac arrest. We report the case of a 70-year old man with dizziness and convulsive syncope whose initial ECG showed a right bundle branch block, but then developed ventricular standstill and intermittent high-grade AV block while still in the ED. He was transferred to the ICU and underwent pacemaker implantation. A high index of suspicion for dysrhythmias should be maintained for any patient presenting to the ED with high-risk syncope.


Assuntos
Arritmias Cardíacas/diagnóstico , Bloqueio de Ramo/diagnóstico , Serviços Médicos de Emergência , Síncope/etiologia , Idoso , Arritmias Cardíacas/complicações , Arritmias Cardíacas/fisiopatologia , Bloqueio de Ramo/complicações , Bloqueio de Ramo/fisiopatologia , Eletrocardiografia , Humanos , Masculino , Marca-Passo Artificial , Síncope/diagnóstico por imagem , Síncope/fisiopatologia , Resultado do Tratamento
12.
Eur J Gen Pract ; 25(3): 109-115, 2019 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-31339387

RESUMO

Background: Right bundle branch block (RBBB) is among the most common electrocardiographic abnormalities. Objectives: To establish the prevalence and incidence of RBBB in the general population without cardiovascular events (CVE) and whether RBBB increases cardiovascular morbidity and mortality compared with patients with a normal electrocardiogram (ECG). Methods: A historical study of two cohorts including 2981 patients from 29 primary health centres without baseline CVE. Cox (for CVE) and logistic (for cardiovascular factors) regression was used to assess their association with RBBB. Results: Of the patients (58% women; mean age 65.9), 92.2% had a normal ECG, 4.6% incomplete RBBB (iRBBB) and 3.2% complete RBBB (cRBBB). Mean follow-up was five years. Factors associated with appearance of cRBBB were male sex (HR = 3.8; 95%CI: 2.4-6.1) and age (HR = 1.05 per year; 95%CI: 1.03-1.08). In a univariate analysis, cRBBB was associated with an increase in all-cause mortality but only bifascicular block (BFB) was significant after adjusting for confounders. cRBBB tended to increase CVE but the results were not statistically significant. Presence of iRBBB was not associated with adverse outcomes. Patients with iRBBB who progressed to cRBBB showed a higher incidence of heart failure and chronic kidney disease. Conclusion: In this general population cohort with no CV disease, 8% had RBBB, with a higher prevalence among men and elderly patients. Although all-cause mortality and CVE tended to increase in the presence of cRBBB, only BFB showed a statistically significant association with cRBBB. Patients with iRBBB who progressed to cRBBB had a higher incidence of CVE. We detected no effect of iRBBB on morbidity and mortality.


Assuntos
Bloqueio de Ramo/epidemiologia , Doenças Cardiovasculares/epidemiologia , Eletrocardiografia , Fatores Etários , Idoso , Bloqueio de Ramo/diagnóstico , Estudos de Coortes , Progressão da Doença , Feminino , Seguimentos , Insuficiência Cardíaca/epidemiologia , Humanos , Incidência , Masculino , Prevalência , Insuficiência Renal Crônica/epidemiologia , Fatores Sexuais
13.
BMJ Case Rep ; 12(7)2019 Jul 01.
Artigo em Inglês | MEDLINE | ID: mdl-31266761

RESUMO

A non-invasive fetal ECG was performed on a 36-year-old pregnant woman at 24+6 weeks of gestation as part of ongoing clinical research. A paediatric cardiologist suspected an incomplete bundle branch block based on the averaged ECGs from the recording. The characteristic terminal R' wave was present in multiple leads of the fetal ECGs. A fetal anomaly scan had been performed at 20 weeks of gestation and showed no abnormalities. An incomplete right bundle branch block was confirmed on an ECG recorded at the age of 2 years. This case shows the possibility of novel non-invasive fetal ECG technology as an adjunct to the diagnosis of fetal cardiac anomalies in the future.


Assuntos
Bloqueio de Ramo/diagnóstico , Eletrocardiografia/métodos , Diagnóstico Pré-Natal/métodos , Adulto , Bloqueio de Ramo/fisiopatologia , Diagnóstico Diferencial , Feminino , Humanos , Recém-Nascido , Masculino , Gravidez
14.
J Am Coll Cardiol ; 73(24): 3082-3099, 2019 06 25.
Artigo em Inglês | MEDLINE | ID: mdl-31221257

RESUMO

BACKGROUND: The benefits of cardiac resynchronization therapy (CRT) in patients with non-left bundle branch block (LBBB) conduction abnormality have not been fully explored. OBJECTIVES: This study sought to evaluate clinical outcomes among Medicare-aged patients with nonspecific intraventricular conduction delay (NICD) versus right bundle branch block (RBBB) in patients eligible for implantation with a CRT with defibrillator (CRT-D). METHODS: Using the National Cardiovascular Data Registry implantable cardioverter-defibrillator (ICD) registry data between 2010 and 2013, the authors compared outcomes in CRT-eligible patients implanted with CRT-D versus ICD-only therapy among patients with NICD and RBBB. Also, among all CRT-D-implanted patients, the authors compared outcomes in those with NICD versus RBBB. Survival curves and multivariable adjusted hazard ratios (HRs) were used to assess outcomes including hospitalization and death. RESULTS: In 11,505 non-LBBB CRT-eligible patients, after multivariable adjustment, among patients with RBBB, CRT-D was not associated with better outcomes, compared with ICD alone, regardless of QRS duration. Among patients with NICD and a QRS ≥150 ms, CRT-D was associated with decreased mortality at 3 years compared with ICD alone (HR: 0.602; 95% confidence interval [CI]: 0.416 to 0.871; p = 0.0071). Among 5,954 CRT-D-implanted patients, after multivariable adjustment NICD compared with RBBB was associated with lower mortality at 3 years in those with a QRS duration of ≥150 ms (HR: 0.757; 95% CI: 0.625 to 0.917; p = 0.0044). CONCLUSIONS: Among non-LBBB CRT-D-eligible patients, CRT-D implantation was associated with better outcomes compared with ICD alone specifically in NICD patients with a QRS duration of ≥150 ms. Careful patient selection should be considered for CRT-D implantation in patients with non-LBBB conduction.


Assuntos
Bloqueio de Ramo , Doença do Sistema de Condução Cardíaco , Terapia de Ressincronização Cardíaca , Desfibriladores Implantáveis/estatística & dados numéricos , Ventrículos do Coração/fisiopatologia , Idoso , Bloqueio de Ramo/diagnóstico , Bloqueio de Ramo/epidemiologia , Bloqueio de Ramo/fisiopatologia , Bloqueio de Ramo/terapia , Doença do Sistema de Condução Cardíaco/diagnóstico , Doença do Sistema de Condução Cardíaco/epidemiologia , Doença do Sistema de Condução Cardíaco/fisiopatologia , Doença do Sistema de Condução Cardíaco/terapia , Terapia de Ressincronização Cardíaca/efeitos adversos , Terapia de Ressincronização Cardíaca/métodos , Terapia de Ressincronização Cardíaca/estatística & dados numéricos , Cardioversão Elétrica/instrumentação , Cardioversão Elétrica/métodos , Eletrocardiografia/métodos , Feminino , Humanos , Masculino , Medicare/estatística & dados numéricos , Avaliação de Processos e Resultados em Cuidados de Saúde , Seleção de Pacientes , Sistema de Registros , Estados Unidos/epidemiologia
15.
BMC Fam Pract ; 20(1): 58, 2019 05 06.
Artigo em Inglês | MEDLINE | ID: mdl-31060516

RESUMO

BACKGROUND: Right bundle branch block is one of the most common electrocardiographic abnormalities. Most cases of right bundle branch block are detected in asymptomatic patients in primary care, so a correct interpretation of electrocardiograms (ECGs) at this level is necessary. The objective of this research is to determine the degree of concordance in the diagnosis of incomplete and complete right bundle branch block between four primary care researchers and a cardiologist. METHODS: The research design is a retrospective cohort study of patients over 18 years of ages of patients over 18 years of ages who underwent an ECG for any reason and were diagnosed with right bundle branch block by their physician. The physicians participating, 4 primary care researchers and a cardiologist were specialized in interpreting electrocardiographic records. The diagnosis of incomplete and complete right bundle branch block was recorded and other secondary variables were analysed. In case of diagnostic discordance between the researchers, the ECGs were reviewed by an expert cardiologist, who interpreted them, established the diagnosis and analysed the possible causes for the discrepancy. RESULTS: We studied 160 patients diagnosed with right bundle branch block by their general practise. The patients had a mean age of 64.8 years and 54% of them were men. The concordance in the diagnosis of incomplete right bundle branch block showed a Fleiss' kappa index (k) of 0.71 among the five researchers and of 0.85 among only the primary care researchers. The k for complete right bundle branch block was 0.93 among the five researchers and 0.96 among only the primary care researchers. CONCLUSION: The interobserver agreement in the diagnosis of right bundle branch block performed by physicians specialized in ECG interpretation (primary care physicians and a cardiologist) was very good. The variability was greater for the diagnosis of incomplete right bundle branch block.


Assuntos
Bloqueio de Ramo/diagnóstico , Cardiologistas , Eletrocardiografia , Médicos de Atenção Primária , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Variações Dependentes do Observador , Estudos Retrospectivos , Adulto Jovem
17.
Cardiovasc Ultrasound ; 17(1): 10, 2019 May 21.
Artigo em Inglês | MEDLINE | ID: mdl-31113440

RESUMO

BACKGROUND: The association of a Classical left bundle branch block (LBBB) contraction pattern and better outcome after cardiac resynchronization therapy (CRT) has only been studied using vendor-specific software for echocardiographic speckle-tracked longitudinal strain analysis. The purpose of this study was to assess whether a Classical LBBB contraction pattern on longitudinal strain analysis using vendor-independent software is associated with clinical outcome in CRT recipients with LBBB. METHODS: This was a retrospective cohort study including CRT recipients with LBBB, heart failure, and left ventricular (LV) ejection fraction ≤35%. Speckle-tracked echocardiographic longitudinal strain analysis was performed retrospectively on echocardiograms using vendor-independent software. The presence of a Classical LBBB contraction pattern was determined by consensus of two readers. The primary end point was a composite of time to death, heart transplantation or LV assist device implantation. Secondary outcome was ≥15% reduction in LV end-systolic volume. Intra- and inter-reader agreement of the longitudinal strain contraction pattern was assessed by calculating Cohen's κ. RESULTS: Of 283 included patients, 113 (40%) were women, mean age was 66 ± 11 years, and 136 (48%) had ischemic heart disease. A Classical LBBB contraction pattern was present in 196 (69%). The unadjusted hazard ratio for reaching the primary end point was 1.93 (95% confidence interval, 1.36-2.76, p < 0.001) when comparing patients without to patients with a Classical LBBB contraction pattern. Adjusted for ischemic heart disease and QRS duration < 150 milliseconds the hazard ratio was 1.65 (95% confidence interval, 1.12-2.43, p = 0.01). Of the 123 (43%) patients with a follow-up echocardiogram, 64 of 85 (75%) of patients with a Classical LBBB contraction pattern compared to 13 of 38 (34%) without, had ≥15% reduction in LV end-systolic volume (p < 0.001). Cohen's κ were 0.86 (95% confidence interval, 0.71-1.00) and 0.42 (95% confidence interval, 0.30-0.54) for intra- and inter-reader agreement, respectively. CONCLUSION: Using vendor-independent strain software, a Classical LBBB contraction pattern is associated with better outcome in CRT recipients with LBBB, but inter-reader agreement for the classification of contraction pattern is only moderate.


Assuntos
Bloqueio de Ramo/fisiopatologia , Terapia de Ressincronização Cardíaca/métodos , Comércio , Ecocardiografia/métodos , Ventrículos do Coração/diagnóstico por imagem , Contração Miocárdica/fisiologia , Função Ventricular Esquerda/fisiologia , Idoso , Bloqueio de Ramo/diagnóstico , Bloqueio de Ramo/terapia , Eletrocardiografia , Feminino , Seguimentos , Ventrículos do Coração/fisiopatologia , Humanos , Interpretação de Imagem Assistida por Computador , Masculino , Estudos Retrospectivos , Software , Volume Sistólico/fisiologia
19.
Ter Arkh ; 91(4): 83-89, 2019 May 16.
Artigo em Inglês | MEDLINE | ID: mdl-31094481

RESUMO

AIM: To evaluate standard 12-lead ECG indices for the differential diagnosis of wide QRS tachycardias with right bundle branch block (RBBB) pattern. MATERIALS AND METHODS: Study analyses the 244 ECG indices in 111 patients (79 males and 32 females, age 53±17 years) with RBBB tachycardias, who underwent electrophysiological studies. First step includes retrospective analysis of QRS characteristics in 20 patients with ventricular tachycardias (VT), 24 pts with aberrant supraventricular tachycardias (SVT+RBBB) and 14 pts with antidromic SVTs (WPW). ROC- and multifactorial analyses were performed to develop diagnostic ECG algorithms. The prognostic accuracy of the algorithms was subsequently evaluated on a prospective group of patients with RBBB tachycardias (n=53). RESULTS: ECG criteria of RBBB VTs were: 1) the presence Q-wave in lead II, 2) the duration interval R(peak)-S(end) >100 ms in lead V5. ECG criteria for antidromic SVTs with RBBB were: 1) the duration of the R wave in lead I ≥80 ms, 2) the absence of split (M-sharp) R-waves in lead V2, 3) the absence notch in ascending S wave in lead aVL. The accuracy of the algorhythm for diagnostic of VTs with RBBB was 83% (sensitivity 100%, specificity 73%). The accuracy of the algorhythm for diagnostic of antidromic SVTs with RBBB was 91% (sensitivity 85%, specificity 96%). CONCLUSION: The proposed algorithms are based on new ECG criteria for the differential diagnosis of wide QRS complexes tachycardias with RBBB pattern, unlike the previous algorithms.


Assuntos
Bloqueio de Ramo/diagnóstico , Eletrocardiografia/métodos , Taquicardia/diagnóstico , Adulto , Idoso , Bloqueio de Ramo/fisiopatologia , Diagnóstico Diferencial , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Prospectivos , Estudos Retrospectivos , Taquicardia/fisiopatologia
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