Your browser doesn't support javascript.
Mostrar: 20 | 50 | 100
Resultados 1 - 6 de 6
Mais filtros

Intervalo de ano de publicação
J Am Coll Cardiol ; 74(18): 2278-2291, 2019 Nov 05.
Artigo em Inglês | MEDLINE | ID: mdl-31672185


BACKGROUND: The assessment of coronary flow velocity reserve (CFVR) in left anterior descending coronary artery (LAD) expands the risk stratification potential of stress echocardiography (SE) based on stress-induced regional wall motion abnormalities (RWMA). OBJECTIVES: The purpose of this study was to assess the feasibility and functional correlates of CFVR. METHODS: This prospective, observational, multicenter study initially screened 3,410 patients (2,061 [60%] male; age 63 ± 11 years; ejection fraction 61 ± 9%) with known or suspected coronary artery disease and/or heart failure. All patients underwent SE (exercise, n = 1,288; vasodilator, n = 1,860; dobutamine, n = 262) based on new or worsening RWMA in 20 accredited laboratories of 8 countries. CFVR was calculated as the stress/rest ratio of diastolic peak flow velocity pulsed-Doppler assessment of LAD flow. A subset of 1,867 patients was followed up. RESULTS: The success rate for CFVR on LAD was 3,002 of 3,410 (feasibility = 88%). Reduced (≤2.0) CFVR was found in 896 of 3,002 (30%) patients. At multivariable logistic regression analysis, inducible RWMA (odds ratio [OR]: 6.5; 95% confidence interval [CI]: 4.9 to 8.5; p < 0.01), abnormal left ventricular contractile reserve (OR: 3.4; 95% CI: 2.7 to 4.2; p < 0.01), and B-lines (OR: 1.5; 95% CI: 1.1 to 1.9; p = 0.01) were associated with reduced CFVR. During a median follow-up time of 16 months, 218 events occurred. RWMA (hazard ratio: 3.8; 95% CI: 2.3 to 6.3; p < 0.001) and reduced CFVR (hazard ratio: 1.5; 95% CI: 1.1 to 2.2; p = 0.009) were independently associated with adverse outcome. CONCLUSIONS: CFVR is feasible with all SE protocols. Reduced CFVR is often accompanied by RWMA, abnormal LVCR, and pulmonary congestion during stress, and shows independent value over RWMA in predicting an adverse outcome.

Int J Cardiovasc Imaging ; 35(6): 1019-1026, 2019 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-30977036


The peak stress/rest ratio of left ventricular (LV) elastance, or LV force, is a load-independent index of left ventricular contractile reserve (LVCR) with stress echo (SE). To assess the accuracy of LVCR calculated during SE with approaches of different complexity. Two-hundred-forty patients were referred to SE for known or suspected coronary artery disease or heart failure and, of those, 200 patients, age 61 ± 15, 99 females, with interpretable volumetric SE were enrolled. All readers had passed the upstream quality control reading for regional wall motion abnormality (RWMA) and end-systolic volume (ESV) measurement. The employed stress was dipyridamole (0.84 mg, 6 min) in 86 (43%) and dobutamine (up to 40 mcg/kg/min) in 114 (57%) patients. All underwent SE with evaluation of RWMA and simultaneous LVCR assessment with stress/rest ratio of LV force (systolic blood pressure by cuff sphygmomanometer/ESV). ESV was calculated in each patient by two of three methods: biplane Simpson rule (S, in 100 patients), single plane area-length (AL, apical four-chamber area and length, in 100 patients), and Teichholz rule (T, from parasternal long axis and/or short axis view, in 200 patients). RMWA were observed in 54 patients. Success rate for ESV measurement was 76% (100/131) for S, 92% (100/109) for AL, and 100% (240/240) for T. There were 100 paired measurements (rest and stress) with S versus T, and 100 with AL versus T. The analysis time was the shortest for T (33 ± 8 s at rest, 34 ± 7 s at stress), intermediate for AL (70 ± 22 s at rest 67 ± 21 s at stress), and the longest for S (136 ± 24 at rest 129 ± 27 s at stress, p < 0.05 vs. T and AL). ESV absolute values were moderately correlated: T versus S (r rest = 0.746, p < 0.01, n = 100; r stress = 0.794, p < 0.01, n = 100); T vs. AL (r = 0.603 p < 0.01, n = 100, at rest and r = 0.820 p < 0.01 n = 100 at peak stress). LVCR values were tightly correlated independently of the method employed: T versus S (r = 0.899, p < 0.01, n = 100), and T versus AL (r = 0.845, p < 0.01, n = 100). LVCR can be accurately determined with all three methods used to extract the raw values of ESV necessary to generate the calculation of Force. Although S is known to be more precise in determining absolute ESV values, the relative (rest-stress) changes can be assessed, with comparable accuracy, with simpler and more feasible T and AL methods, characterized by higher success rate, shorter imaging and analysis time.

Doença da Artéria Coronariana/diagnóstico por imagem , Ecocardiografia sob Estresse/métodos , Insuficiência Cardíaca/diagnóstico por imagem , Volume Sistólico , Função Ventricular Esquerda , Agonistas de Receptores Adrenérgicos beta 1/administração & dosagem , Idoso , Doença da Artéria Coronariana/fisiopatologia , Dipiridamol/administração & dosagem , Dobutamina/administração & dosagem , Estudos de Viabilidade , Feminino , Insuficiência Cardíaca/fisiopatologia , Humanos , Itália , Masculino , Pessoa de Meia-Idade , Valor Preditivo dos Testes , Estudos Prospectivos , Reprodutibilidade dos Testes , Sístole , Vasodilatadores/administração & dosagem
Cardiovasc Ultrasound ; 16(1): 20, 2018 Sep 25.
Artigo em Inglês | MEDLINE | ID: mdl-30249305


BACKGROUND: The effectiveness trial "Stress echo (SE) 2020" evaluates novel applications of SE in and beyond coronary artery disease. The core protocol also includes 4-site simplified scan of B-lines by lung ultrasound, useful to assess pulmonary congestion. PURPOSE: To provide web-based upstream quality control and harmonization of B-lines reading criteria. METHODS: 60 readers (all previously accredited for regional wall motion, 53 B-lines naive) from 52 centers of 16 countries of SE 2020 network read a set of 20 lung ultrasound video-clips selected by the Pisa lab serving as reference standard, after taking an obligatory web-based learning 2-h module ( ). Each test clip was scored for B-lines from 0 (black lung, A-lines, no B-lines) to 10 (white lung, coalescing B-lines). The diagnostic gold standard was the concordant assessment of two experienced readers of the Pisa lab. The answer of the reader was considered correct if concordant with reference standard reading ±1 (for instance, reference standard reading of 5 B-lines; correct answer 4, 5, or 6). The a priori determined pass threshold was 18/20 (≥ 90%) with R value (intra-class correlation coefficient) between reference standard and recruiting center) > 0.90. Inter-observer agreement was assessed with intra-class correlation coefficient statistics. RESULTS: All 60 readers were successfully accredited: 26 (43%) on first, 24 (40%) on second, and 10 (17%) on third attempt. The average diagnostic accuracy of the 60 accredited readers was 95%, with R value of 0.95 compared to reference standard reading. The 53 B-lines naive scored similarly to the 7 B-lines expert on first attempt (90 versus 95%, p = NS). Compared to the step-1 of quality control for regional wall motion abnormalities, the mean reading time per attempt was shorter (17 ± 3 vs 29 ± 12 min, p < .01), the first attempt success rate was higher (43 vs 28%, p < 0.01), and the drop-out of readers smaller (0 vs 28%, p < .01). CONCLUSIONS: Web-based learning is highly effective for teaching and harmonizing B-lines reading. Echocardiographers without previous experience with B-lines learn quickly.

Ecocardiografia sob Estresse/normas , Pulmão/diagnóstico por imagem , Edema Pulmonar/diagnóstico , Controle de Qualidade , Feminino , Humanos , Internet , Masculino , Pessoa de Meia-Idade
Int J Cardiol ; 249: 479-485, 2017 Dec 15.
Artigo em Inglês | MEDLINE | ID: mdl-28986062


BACKGROUND: The trial "Stress Echo (SE) 2020" evaluates novel applications of SE beyond coronary artery disease. The aim of the study was control quality and harmonize reading criteria. METHODS: One reader from 78 centers of the SE 2020 network asked for credentials to read a set of 20 SE video-clips selected by the core lab. All aspiring centers met the pre-requisite of high-volume and the years of experience in SE ranged from 5 to 31years (mean value 18years). The diagnostic gold standard was a reading by the core lab. The a priori determined pass threshold was 18/20 (≥90%). RESULTS: Of the initial 78 who started, 57 completed the first attempt: individual readers' score on first attempt ranged from 07/20 to 20/20 (accuracy from 35% to 100%, mean 78.7±13%) and 44 readers passed it. There was a very poor correlation between years of experience and the reader's score on first attempt (r=-0.161, p=0.231). Of the 13 readers who failed the first attempt, 12 took it again after the web-based session and their accuracy improved (74% vs. 96%, p<0.001). The kappa inter-observer agreement before and after web-based training was 0.59 on first attempt and rose to 0.91 on the last attempt. CONCLUSIONS: In SE reading, the volume of activity or years of experience is not synonymous with diagnostic quality. Qualitative analysis and operator-dependence can become a limiting weakness in clinical practice, in the absence of strict pathways of learning, credentialing and audit.

Cardiologistas/normas , Competência Clínica/normas , Doença das Coronárias/diagnóstico por imagem , Ecocardiografia sob Estresse/normas , Controle de Qualidade , Doença das Coronárias/epidemiologia , Ecocardiografia sob Estresse/métodos , Humanos , Internacionalidade , Reprodutibilidade dos Testes
Cardiovasc Ultrasound ; 15(1): 3, 2017 Jan 18.
Artigo em Inglês | MEDLINE | ID: mdl-28100277


BACKGROUND: Stress echocardiography (SE) has an established role in evidence-based guidelines, but recently its breadth and variety of applications have extended well beyond coronary artery disease (CAD). We lack a prospective research study of SE applications, in and beyond CAD, also considering a variety of signs in addition to regional wall motion abnormalities. METHODS: In a prospective, multicenter, international, observational study design, > 100 certified high-volume SE labs (initially from Italy, Brazil, Hungary, and Serbia) will be networked with an organized system of clinical, laboratory and imaging data collection at the time of physical or pharmacological SE, with structured follow-up information. The study is endorsed by the Italian Society of Cardiovascular Echography and organized in 10 subprojects focusing on: contractile reserve for prediction of cardiac resynchronization or medical therapy response; stress B-lines in heart failure; hypertrophic cardiomyopathy; heart failure with preserved ejection fraction; mitral regurgitation after either transcatheter or surgical aortic valve replacement; outdoor SE in extreme physiology; right ventricular contractile reserve in repaired Tetralogy of Fallot; suspected or initial pulmonary arterial hypertension; coronary flow velocity, left ventricular elastance reserve and B-lines in known or suspected CAD; identification of subclinical familial disease in genotype-positive, phenotype- negative healthy relatives of inherited disease (such as hypertrophic cardiomyopathy). RESULTS: We expect to recruit about 10,000 patients over a 5-year period (2016-2020), with sample sizes ranging from 5,000 for coronary flow velocity/ left ventricular elastance/ B-lines in CAD to around 250 for hypertrophic cardiomyopathy or repaired Tetralogy of Fallot. This data-base will allow to investigate technical questions such as feasibility and reproducibility of various SE parameters and to assess their prognostic value in different clinical scenarios. CONCLUSIONS: The study will create the cultural, informatic and scientific infrastructure connecting high-volume, accredited SE labs, sharing common criteria of indication, execution, reporting and image storage of SE to obtain original safety, feasibility, and outcome data in evidence-poor diagnostic fields, also outside the established core application of SE in CAD based on regional wall motion abnormalities. The study will standardize procedures, validate emerging signs, and integrate the new information with established knowledge, helping to build a next-generation SE lab without inner walls.

Cardiomiopatias/diagnóstico , Ecocardiografia sob Estresse/métodos , Ventrículos do Coração/diagnóstico por imagem , Isquemia Miocárdica/diagnóstico , Idoso , Cardiomiopatias/fisiopatologia , Feminino , Ventrículos do Coração/fisiopatologia , Humanos , Masculino , Pessoa de Meia-Idade , Isquemia Miocárdica/fisiopatologia , Estudos Prospectivos , Reprodutibilidade dos Testes
Sci. med ; 14(2): 176-181, 2004.
Artigo em Português | LILACS | ID: lil-445318


O objetivo deste artigo é fazer uma breve revisão dos aspectos clínicos e, mais especificamente, dos dados disponíveis na literatura sobre tratamento farmacológico da insuficiência cardíaca diastólica, abordando desfechos de morbidade e mortalidade. O método utilizado foi à revisão não sistemática de artigos publicados em periódicos disponíveis no Medline na última década, bem como revisões do próprio autor, não selecionando o tipo de publicação, mas priorizando as que enfocam dados sobre insuficiência cardíaca diastólica e seu tratamento medicamentoso de agentes como beta-bloqueadores, bloqueadores do canal do cálcio, inibidores da enzima de conversão da angiotensiva e antagonistas da angiotensiva II. Não são muitos os estudos com desenho adequado sobre tratamento da insuficiência cardíaca diastólica. Nesta publicação, os dados selecionados revelam melhorias em desfechos substitutivos como índices diastólicos, de hipertrofia de ventrículo esquerdo ou tolerância ao exercício. Entretanto, não foi verificado melhora consistente em mortalidade em nenhum dos estudos disponíveis.

Humanos , Feminino , Masculino , Diástole/fisiologia , Ecocardiografia Doppler , Insuficiência Cardíaca , Disfunção Ventricular Esquerda