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Master's Dissertation
DOI
https://doi.org/10.11606/D.98.2022.tde-10072023-145450
Document
Author
Full name
Stephanie Macedo Andrade
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2022
Supervisor
Committee
Bihan, David Costa de Souza Le (President)
Armaganijan, Luciana Vidal
Vieira, Marcelo Luiz Campos
Fischer, Cláudio Henrique
Title in Portuguese
Análise da função atrial esquerda em pacientes com insuficiência mitral funcional associada à miocardiopatia dilatada
Keywords in Portuguese
Cardiomiopatia Dilatada
Ecocardiografia
Função do Átrio Esquerdo
Insuficiência da Valva Mitral
Abstract in Portuguese
Objetivos: A insuficiência mitral (IM) funcional está associada à miocardiopatia dilatada (MCD), à insuficiência cardíaca (IC) e à piora da função atrial esquerda (FAE). O objetivo desse estudo foi avaliar a relação entre a piora da FAE e da dispersão mecânica atrial, avaliadas por ecocardiografia por speckle tracking, com o prognóstico em uma população com MCD e IM funcional. Métodos e resultados: Trata-se de uma coorte retrospectiva, que incluiu 214 pacientes do Instituto Dante Pazzanese de Cardiologia com MCD, sendo 46 sem IM e 168 com IM discreta, moderada ou grave, que foram seguidos por 4,77 ± 4,03 anos. A análise da dispersão mecânica atrial foi realizada pela técnica de strain por speckle tracking e a FAE por esta técnica e por variação volumétrica. Os desfechos foram mortalidade, transplante cardíaco e internações por IC. A fração de esvaziamento atrial ativa (FEAA) associou-se significativamente à mortalidade, principalmente quando abaixo de 17,8% [HR 0,941, (95%CI) (0,897-0,987); p= 0,013] e à sobrevida livre de transplante [HR 0,945 (95%CI) (0,903-0,988); p= 0,014]. A IM funcional [HR 4,373 (95%CI) (1,032-18,523); p=0,045], o strain de contração do AE [HR 0,847 (95%CI) (0,749-0,958); p= 0,008] e a dispersão mecânica atrial acima de 19,1%, [HR 1,033 (95%CI) (1,013-1,054); p= 0,001] foram preditores independentes de internações por IC. O diabetes insulino-dependente [HR 2,581 (95%CI) (0,998-6,673); p= 0,050] e a dispersão [HR 1,027 (95%CI) (1,007-1,048); p= 0,010] associaram-se à sobrevida livre de eventos cardiovasculares maiores. Conclusão: Em uma população com MCD e IM funcional, a FAE e a dispersão mecânica atrial, avaliadas por speckle tracking e variação volumétrica atrial, apresentaram correlação significativa com desfechos cardiovasculares maiores.
Title in English
Left atrial function analysis in patients with functional mitral regurgitation associated with dilated cardiomyopathy
Keywords in English
Atrial Function
Cardiomyopathy
Dilated
Echocardiography
Left
Mitral Valve Insufficiency
Abstract in English
Aims: Functional mitral regurgitation (FMR) is associated with dilated cardiomyopathy (DCM), heart failure (HF) and worsening left atrial function (LAF). The aim of this study was to assess the correlation between worsening LAF and atrial mechanical dispersion (AMD), assessed by speckle tracking echocardiography (STE), with prognosis in a population with DCM and FMI. Methods and results: This study is a retrospective cohort that included 214 patients from the Instituto Dante Pazzanese de Cardiologia with DCM, 46 without FMR and 168 with mild, moderate or severe FMR followed for 4.77 ± 4.03 years. The AMD analysis was performed using the strain technique by EST and the LAF was measured by means of EST and volumetric variation. Outcomes were mortality, heart transplantation (HT) and hospitalizations for HF. Atrial active emptying fraction (AAEF) was significantly associated with mortality, especially when below 17.8% [Hazard Ratio (HR) 0.941, 95% confidence interval (95%CI) (0.897-0.987), p 0.013] and HT-free survival [HR 0.945 (95%CI) (0.903-0.988), p 0.014]. The FMR [HR 4.373 (95%CI) (1.032-18.523), p 0.045], the LA contraction strain [HR 0.847 (95%CI) (0.749-0.958), p 0.008] and the AMD when above 19,1% [HR 1,033 (95%CI) (1.013-1.054), p 0.001] were independent predictors of hospitalizations for HF. Diabetes with insulin use [HR 2.581 (95%CI) (0.998-6.673), p 0.050] and AMD [HR 1,027 (95%CI) (1.007-1.048), p 0.010] were associated with cardiovascular event-free survival. Conclusion: In a population with DCM and FMR, LAF and AMD, assessed by means of EST and atrial volumetric variation were significantly associated with major cardiovascular outcomes.
 
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Publishing Date
2023-10-06
 
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