{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,24]],"date-time":"2026-07-24T17:06:27Z","timestamp":1784912787675,"version":"3.55.0"},"reference-count":16,"publisher":"Sociedade Brasileira de Cardiologia","issue":"6","license":[{"start":{"date-parts":[[2026,1,1]],"date-time":"2026-01-01T00:00:00Z","timestamp":1767225600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,1,1]],"date-time":"2026-01-01T00:00:00Z","timestamp":1767225600000},"content-version":"am","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,1,1]],"date-time":"2026-01-01T00:00:00Z","timestamp":1767225600000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Arq. Bras. Cardiol."],"abstract":"<jats:p>Resumo  Fundamento: O seio coron\u00e1rio (SC) desempenha um papel fundamental na drenagem venosa card\u00edaca e est\u00e1 anatomicamente adjacente \u00e0 regi\u00e3o nodal atrioventricular. Embora o aumento estrutural do SC j\u00e1 tenha sido descrito em pacientes com taquicardia por reentrada nodal atrioventricular (TRNAV), o fluxo do seio coron\u00e1rio (FSC) avaliado por ecocardiografia transtor\u00e1cica (ETT) ainda n\u00e3o havia sido investigado nessa popula\u00e7\u00e3o.  Objetivo: Avaliar a rela\u00e7\u00e3o entre TRNAV e FSC.  M\u00e9todos: Este estudo retrospectivo, de centro \u00fanico, incluiu 35 pacientes com TRNAV submetidos \u00e0 abla\u00e7\u00e3o bem-sucedida da via lenta e 34 controles saud\u00e1veis pareados por idade e sexo. Todos os participantes realizaram ecocardiografia transtor\u00e1cica abrangente. O di\u00e2metro do \u00f3stio do SC, o di\u00e2metro do SC e o FSC foram medidos por Doppler pulsado. O FSC foi calculado utilizando par\u00e2metros geom\u00e9tricos e derivados do Doppler. Valores de p &lt; 0.05 foram considerados estatisticamente significativos.  Resultados: Os par\u00e2metros globais de fun\u00e7\u00e3o sist\u00f3lica e diast\u00f3lica dos ventr\u00edculos esquerdo e direito foram semelhantes entre os grupos. Pacientes com TRNAV apresentaram di\u00e2metros significativamente maiores do \u00f3stio do SC e do SC em compara\u00e7\u00e3o aos controles (ambos p&lt;0.001). Apesar desse aumento, o FSC foi significativamente reduzido no grupo TRNAV (460.8 \u00b1 83.3 vs. 523.8 \u00b1 90.1 mL\/min, p=0.004), acompanhado por um menor integral velocidade-tempo do SC. Notavelmente, o FSC indexado \u00e0 massa ventricular esquerda tamb\u00e9m permaneceu significativamente menor nos pacientes com TRNAV, indicando que a redu\u00e7\u00e3o do fluxo foi independente da massa mioc\u00e1rdica.  Conclus\u00e3o: Pacientes com TRNAV apresentam um perfil hemodin\u00e2mico distinto do SC, caracterizado por aumento estrutural do SC e redu\u00e7\u00e3o do FSC avaliado por ecocardiografia transtor\u00e1cica. Esses achados sugerem altera\u00e7\u00f5es na hemodin\u00e2mica venosa coron\u00e1ria na TRNAV e fornecem novos insights fisiopatol\u00f3gicos por meio de uma modalidade de imagem n\u00e3o invasiva.<\/jats:p>","DOI":"10.36660\/abc.20250891","type":"journal-article","created":{"date-parts":[[2026,7,24]],"date-time":"2026-07-24T16:37:55Z","timestamp":1784911075000},"source":"Crossref","is-referenced-by-count":0,"title":["Avalia\u00e7\u00e3o do Fluxo e das Dimens\u00f5es do Seio Coron\u00e1rio por Ecocardiografia Transtor\u00e1cica em Pacientes com Taquicardia por Reentrada Nodal Atrioventricular"],"prefix":"10.36660","volume":"123","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6849-8894","authenticated-orcid":false,"given":"Ali","family":"Duygu","sequence":"first","affiliation":[{"name":"Bandirma Onyedi Eylul Universitesi,  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