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1.
Article in Chinese | WPRIM | ID: wpr-879279

ABSTRACT

This study aims to explore the intraventricular pressure difference (IVPD) within left ventricle in patients with paroxysmal atrial fibrillation (PAF) by using the relative pressure imaging (RPI) of vector flow mapping (VFM). Twenty patients with paroxysmal atrial fibrillation (PAF) and thirty control subjects were enrolled in the study. Systolic and diastolic IVPD derived from VFM within left ventricle and conventional echocardiographic parameters were analyzed. It was found that the B-A IVPD of left ventricle in PAF patients showed the same pattern as controls-single peak and single valley during systole and double peaks and double valleys during diastole. Basal IVPD was the main component of base to apex IVPD (B-A IVPD). The isovolumetric systolic IVPD was associated with early systolic IVPD, early systolic IVPD was associated with late systolic IVPD, and late systolic IVPD was associated with isovolumic diastolic IVPD (all


Subject(s)
Atrial Fibrillation/diagnostic imaging , Diastole , Heart Ventricles , Humans , Ventricular Function, Left , Ventricular Pressure
2.
Article in Chinese | WPRIM | ID: wpr-879259

ABSTRACT

Auscultation of heart sounds is an important method for the diagnosis of heart conditions. For most people, the audible component of heart sound are the first heart sound (S1) and the second heart sound (S2). Different diseases usually generate murmurs at different stages in a cardiac cycle. Segmenting the heart sounds precisely is the prerequisite for diagnosis. S1 and S2 emerges at the beginning of systole and diastole, respectively. Locating S1 and S2 accurately is beneficial for the segmentation of heart sounds. This paper proposed a method to classify the S1 and S2 based on their properties, and did not take use of the duration of systole and diastole. S1 and S2 in the training dataset were transformed to spectra by short-time Fourier transform and be feed to the two-stream convolutional neural network. The classification accuracy of the test dataset was as high as 91.135%. The highest sensitivity and specificity were 91.156% and 92.074%, respectively. Extracting the features of the input signals artificially can be avoid with the method proposed in this article. The calculation is not complicated, which makes this method effective for distinguishing S1 and S2 in real time.


Subject(s)
Diastole , Heart , Heart Sounds , Neural Networks, Computer , Rivers
3.
Rev. Assoc. Med. Bras. (1992) ; 66(12): 1750-1756, Dec. 2020. graf
Article in English | LILACS, SES-SP | ID: biblio-1143664

ABSTRACT

SUMMARY Cardiovascular diseases are important causes of morbidity and mortality in the course of chronic kidney disease (CKD). Diastolic dysfunction (DD) may progress with the clinical manifestation of heart failure, known as heart failure with preserved ejection fraction, a condition that precedes systolic dysfunction. The early identification of DD by echocardiography at the point-of-care before the appearance of symptoms and signs of pulmonary congestion and the implementation of appropriate treatment can improve the prognosis of CKD. This review article briefly addresses DD in kidney disease and presents a practical approach to the echocardiographic diagnosis of DD at the point of care.


SUMÁRIO As doenças cardiovasculares são causa importante de morbidade e mortalidade no curso da doença renal crônica (DRC). A disfunção diastólica (DD) pode evoluir com insuficiência cardíaca manifesta clinicamente, denominada insuficiência cardíaca com fração de ejeção preservada, e precede a disfunção sistólica. A identificação precoce da DD pela ecocardiografia "point of care", antes do aparecimento dos sintomas e sinais de congestão pulmonar, e a implementação de tratamento adequado podem melhorar o prognóstico da DRC. Este artigo de revisão aborda brevemente a DD na doença renal e apresenta uma abordagem prática para o diagnóstico ecocardiográfico da DD à beira do leito


Subject(s)
Humans , Ventricular Dysfunction, Left/diagnostic imaging , Heart Failure/therapy , Heart Failure/diagnostic imaging , Stroke Volume , Point-of-Care Systems , Diastole , Nephrologists
5.
Arq. bras. cardiol ; 114(2): 284-292, Feb. 2020. tab, graf
Article in English | LILACS | ID: biblio-1088875

ABSTRACT

Abstract Background: Diastolic dysfunction, commonly evaluated by echocardiography, is an important early finding in many cardiomyopathies. Cardiac magnetic resonance (CMR) often requires specialized sequences that extends the test time. Recently, feature-tracking imaging has been made available, but still requires expensive software and lacks clinical validation. Objective: To assess diastolic function in patients with aortic valve disease (AVD) and compare it with normal controls by evaluating left ventricular (LV) longitudinal displacement by CMR. Methods: We compared 26 AVD patients with 19 normal controls. Diastolic function was evaluated as LV longitudinal displacement in 4-chamber view cine-CMR images using steady state free precession (SSFP) sequence during the entire cardiac cycle with temporal resolution < 50 ms. The resulting plot of atrioventricular junction (AVJ) position versus time generated variables of AVJ motion. Significance level of p < 0.05 was used. Results: Maximum longitudinal displacement (0.12 vs. 0.17 cm), maximum velocity during early diastole (MVED, 0.6 vs. 1.4s-1), slope of the best-fit line of displacement in diastasis (VDS, 0.22 vs. 0.03s-1), and VDS/MVED ratio (0.35 vs. 0.02) were significantly reduced in AVD patients compared with controls, respectively. Aortic regurgitation showed significantly worse longitudinal LV shortening compared with aortic stenosis. Higher LV mass indicated worse diastolic dysfunction. Conclusions: A simple linear measurement detected significant differences on LV diastolic function between AVD patients and controls. LV mass was the only independent predictor of diastolic dysfunction in these patients. This method can help in the evaluation of diastolic dysfunction, improving cardiomyopathy detection by CMR, without prolonging exam time or depending on expensive software.


Resumo Fundamentos: A disfunção diastólica, comumente avaliada por ecocardiografia, é um importante achado precoce na maioria das cardiomiopatias. A ressonância magnética cardíaca (RMC) frequentemente requer sequências específicas que prolongam o tempo de exame. Recentemente, métodos de imagens com monitoramento de dados (feature-tracking) foram desenvolvidos, mas ainda requerem softwares caros e carecem de validação clínica. Objetivos: Avaliar a função diastólica em pacientes com doença valvar aórtica (DVA) e compará-la a controles normais pela medida do deslocamento longitudinal do ventrículo esquerdo (VE) por RMC. Métodos: Nós comparamos 26 pacientes com DVA com 19 controles normais. A função diastólica foi avaliada como uma medida do deslocamento longitudinal do VE nas imagens de cine-RMC no plano quatro câmaras usando a sequência steady state free precession (SSFP) durante todo o ciclo cardíaco com resolução temporal < 50 ms. O gráfico resultante da posição da junção atrioventricular versus tempo gerou variáveis de movimento da junção atrioventricular. Utilizamos nível de significância de p < 0,005. Resultados: Deslocamento longitudinal máximo (0,12 vs. 0,17 cm), velocidade máxima em início de diástole (0,6 vs. 1,4s-1), velocidade máxima na diástase (0,22 vs. 0,03s-1) e a razão entre a velocidade máxima na diástase e a velocidade máxima em diástole inicial (0,35 vs. 0,02) foram significativamente menores nos pacientes com DVA em comparação aos controles normais, respectivamente. Pacientes com insuficiência aórtica apresentaram medidas de encurtamento longitudinal do VE significativamente piores em comparação aqueles com estenose aórtica. O aumento da massa ventricular esquerda indicou pior disfunção diastólica. Conclusões: Esta simples medida linear detectou diferenças significativas na função diastólica do VE entre pacientes com DVA e controles normais. A massa ventricular esquerda foi o único preditor independente de disfunção diastólica nesses pacientes. Este método pode auxiliar na avaliação da disfunção diastólica, melhorando a detecção de cardiomiopatias por RMC sem prolongar o tempo de exame ou depender de caros softwares.


Subject(s)
Humans , Male , Female , Adult , Middle Aged , Aged , Aortic Valve Insufficiency/physiopathology , Aortic Valve Stenosis/physiopathology , Ventricular Dysfunction, Left/physiopathology , Diastole/physiology , Aortic Valve Insufficiency/diagnostic imaging , Aortic Valve Stenosis/diagnostic imaging , Reference Values , Atrioventricular Node/physiopathology , Atrioventricular Node/diagnostic imaging , Time Factors , Bundle of His/physiopathology , Bundle of His/diagnostic imaging , Case-Control Studies , Linear Models , Retrospective Studies , Ventricular Function, Left/physiology , Ventricular Dysfunction, Left/diagnostic imaging , Statistics, Nonparametric , Magnetic Resonance Imaging, Cine/methods
8.
Clinics ; 75: e2428, 2020. tab, graf
Article in English | LILACS | ID: biblio-1142784

ABSTRACT

OBJECTIVES: The aim of this study was to analyze mitral annulus (MA) dynamics using cardiac magnetic resonance (CMR) in patients with degenerative mitral insufficiency who underwent mitral valve repair (MVR). METHODS: Mitral valve imaging was performed by CMR in twenty-nine patients with degenerative mitral insufficiency who underwent MVR between July 2014 and August 2016, with quadrangular resection of the posterior leaflet without ring annuloplasty. They were prospectively followed up from the preoperative period up to 2 years postoperatively. RESULTS: We observed a significant reduction in all measurements of the MA after surgery. The mean systolic circumference of the MA was reduced from 13.28±1.95 cm to 11.50±1.59 cm, and the diastolic circumference was reduced from 12.51±2.01 cm to 10.66±2.09 cm in the immediate postoperative period, measures that remained stable 2 years after MVR (p<0.001). The mean maximum area of the MA was significantly reduced from 14.34±4.03 to 10.45±3.17 cm2 when comparing the immediate postoperative period and the 2 year follow-up (p<0.001). The same occurred with the mean minimum area of the MA, which was reduced from 12.53±3.68 cm2 to 9.23±2.84 cm2 in the same period, and this reduction was greater in the antero-posterior diameter than in the mid-lateral diameter. The mobility of the MA was preserved after surgery, ranging between 19.6% and 25.7% at 2-year follow-up. CONCLUSION: We observed a significant reduction in the MA size after MVR, with preservation of the MA mobility at the 2-year follow-up.


Subject(s)
Humans , Heart Valve Prosthesis Implantation , Mitral Valve Insufficiency/surgery , Mitral Valve Insufficiency/diagnostic imaging , Magnetic Resonance Spectroscopy , Follow-Up Studies , Treatment Outcome , Diastole , Mitral Valve/surgery , Mitral Valve/diagnostic imaging
10.
Arq. bras. cardiol ; 113(6): 1084-1089, Dec. 2019. tab, graf
Article in English | LILACS | ID: biblio-1055075

ABSTRACT

Abstract Background: Obstructive sleep apnea (OSA) is a chronic progressive disorder with high mortality and morbidity rate, associated with cardiovascular diseases (CVD), especially heart failure (HF). The pathophysiological changes related to OSA can directly affect the diastolic function of the left ventricle. Objectives: To assess the association of the risk of OSA, evaluated by the Berlin Questionnaire (BQ), and echocardiographic (ECHO) parameters related to diastolic dysfunction in individuals without HF assisted in primary care. Methods: A cross-sectional study that included 354 individuals (51% women) aged 45 years or older. All individuals selected were submitted to an evaluation that included the following procedures: consultation, filling out the BQ, clinical examination, laboratory examination and transthoracic Doppler echocardiography (TDE). Continuous data are presented as medians and interquartile intervals, and categoric variables in absolute and relative frequencies. The variables associated with risk of OSA and at the 0.05 level integrated the gamma regression models with a log link function. A value of p < 0.05 was considered an indicator of statistical significance. Exclusion criteria were presence of HF, to fill out the BQ and patients with hypertension and obesity not classified as high risk for OSA by other criteria. All individuals were evaluated on a single day with the following procedures: medical appointment, BQ, laboratory tests and ECHO. Results: Of the 354 individuals assessed, 63% were classified as having high risk for OSA. The patients with high risk for OSA present significantly abnormal diastolic function parameters. High risk for OSA confirmed positive and statistically significant association, after adjustments, with indicators of diastolic function, such as indexed left atrium volume LAV-i (p = 0.02); E'/A' (p < 0.01), A (p = 0.02), E/A (p < 0.01). Conclusion: Our data show that patients at high risk for OSA present worsened diastolic function parameters measured by TDE.


Resumo Fundamento: A apneia obstrutiva do sono (AOS) é um transtorno crônico, progressivo, com alta morbimortalidade e associado às doenças cardiovasculares (DCV), entre elas a insuficiência cardíaca (IC). As alterações fisiopatológicas relacionadas com a AOS podem impactar diretamente a função diastólica do ventrículo esquerdo. Objetivo: Estimar a associação entre risco de AOS, avaliada pelo Questionário de Berlim (QB), e parâmetros do ecocardiograma, relacionados com a função diastólica, em indivíduos sem IC na atenção primária. Métodos: Estudo transversal que incluiu 354 indivíduos (51% mulheres) com idade igual ou superior a 45 anos. Todos os indivíduos selecionados foram submetidos a uma avaliação que constou dos seguintes procedimentos: consulta, preenchimento do QB e exame clínico, realização de exames laboratoriais e ecocardiograma Doppler transtorácico (EDT). Os dados contínuos são apresentados em medianas e intervalos interquartílicos e os categóricos em frequências absolutas e relativas. As variáveis que apresentaram associação ao risco de AOS em nível de 0,05 integraram os modelos de regressão gama com função de ligação log link. Análise bruta: Um valor de p < 0,05 foi considerado como indicador de significância estatística. Resultados: Dos 354 indivíduos analisados, 63% foram classificados como tendo alto risco para AOS. Os pacientes com alto risco para AOS apresentam alterações significativas dos parâmetros que avaliam a função diastólica. Alto risco para AOS confirmou sua associação positiva e estatisticamente significativa, após ajuste, a indicadores de disfunção diastólica - VAE-i (p = 0,02); E'/A' (p < 0,01); A (p = 0,02); E/A (p < 0,01). Conclusão: Nossos dados mostram que pacientes com alto risco de AOS apresentam piora dos parâmetros de função diastólica medidos pelo EDT.


Subject(s)
Humans , Male , Female , Middle Aged , Aged , Aged, 80 and over , Ventricular Dysfunction, Left/etiology , Sleep Apnea, Obstructive/complications , Echocardiography, Doppler , Cross-Sectional Studies , Surveys and Questionnaires , Risk Factors , Polysomnography , Ventricular Dysfunction, Left/diagnostic imaging , Diastole/physiology , Hypertension/complications
12.
Rev. bras. cir. cardiovasc ; 34(4): 451-457, July-Aug. 2019. tab, graf
Article in English | LILACS | ID: biblio-1020508

ABSTRACT

Abstract Objective: To evaluate the aortic wall elasticity using the maximal rate of systolic distension (MRSD) and maximal rate of diastolic recoil (MRDR) and their correlation with the aortic size index (ASI). Methods: Forty-eight patients with thoracic aortic aneurysm were enrolled in this study. A standard magnetic resonance imaging (MRI) protocol was used to calculate MRSD and MRDR. Both MRSD and MRDR were expressed as percentile of maximal area/10-3 sec. ASI (maximal aortic diameter/body surface area) was calculated. A correlation between MRSD, MRDR, ASI, and the patient's age was performed using regression plot. Results: A significant correlation between MRSD (t=-4,36; r2=0.29; P≤0.0001), MRDR (t=3.92; r2=0.25; P=0.0003), and ASI (25±4.33 mm/m2; range 15,48-35,14 mm/m2) is observed. As ASI increases, aortic MRSD and MRDR decrease. Such inverse correlation between MRSD, MRDR, and ASI indicates increased stiffness of the ascending aorta. A significant correlation between the patient's age and the decrease in MRSD and MRDR is observed. Conclusion: MRSD and MRDR are significantly correlated with ASI and the patient's age. They seem to describe properly the increasing stiffness of aortas. These two new indexes provide a promising, accessible, and reproducible approach to evaluate the biomechanical property of the aorta.


Subject(s)
Humans , Male , Female , Adult , Middle Aged , Aged , Aorta/physiopathology , Magnetic Resonance Imaging , Aortic Aneurysm, Thoracic/diagnostic imaging , Aneurysm, Dissecting/diagnostic imaging , Systole/physiology , Diastole/physiology , Dilatation, Pathologic , Elasticity
13.
Rev. salud pública Parag ; 9(1): [P57-P64], jun. 2019.
Article in Spanish | LILACS, BDNPAR | ID: biblio-1047032

ABSTRACT

Introducción: La dilatación de la aurícula izquierda (AI) se considera un marcador ecocardiográfico para la remodelación auricular y la fibrilación auricular. Por ende, hemos investigado la correlación entre la dilatación de la AI con las alteraciones hemodinámicas del ventrículo izquierdo en pacientes con hipertensión arterial. Objetivo: Determinar la relación existente entre la hipertensión arterial y la dilatación auricular izquierda. Así mismo determinar las características epidemiológicas de la población en estudio y las diferencias ecocardiográficas entre pacientes hipertensos y pacientes sin HTA. Metodología: En este estudio observacional y prospectivo hemos investigado las variaciones electrocardiográficas, mediciones ecocardiográficas y Holter ECG de 24 hs en pacientes hipertensos que acuden a un hospital terciario desde marzo a septiembre del 2018 en forma ambulatoria y a internados en el Hospital de Clínicas. Resultados: Se estudiaron 104 pacientes, 65 hipertensos conocidos y 39 no hipertensos como grupo control. El diámetro de la AI tuvo una media de 37±8 en pacientes hipertensos, mientras que en pacientes no hipertensos la media fue de 34±5 (p=0,03). Se encontró una asociación significativa entre hipertensión y aumento del diámetro de la AI (p=0,04 OR: 2,6 IC 0,88­7,7). En los pacientes hipertensos se observó una asociación significativa entre la aurícula izquierda dilatada y la fracción de eyección disminuida (p= 0,01 OR: 4,66 IC: 1,28­16,98). Además, una asociación significativa entre la AI dilatada y el diámetro diastólico aumentado del ventrículo izquierdo (VI) (p= 0,0004 OR: 8,75 IC 2,18­35,01). Se observó una asociación significativa entre la presencia de una AI dilatada y el diámetro sistólico del VI aumentado en hipertensos (p= 0,006 OR: 5,74 IC 1,5­21,91). Conclusiones: Hubo una relación significativa entre la hipertensión arterial y la dilatación de la aurícula izquierda. Los pacientes hipertensos con una dilatación de la AI tuvieron un aumento significativo de los diámetros sistólicos y diastólicos del ventrículo izquierdo, así como una disminución significativa de la funcionalidad sistólica del ventrículo izquierdo. Por ende, los pacientes hipertensos que tienen una dilatación de la aurícula izquierda presentaron además alteraciones hemodinámicas asociadas del ventrículo izquierdo. Palabras clave: Dilatación de la aurícula izquierda; Hipertensión arterial; Fracción de eyección del VI. Diámetro sistólico y diastólico del VI.


Introduction: Dilation of the left atrium (LA) is considered an echocardiographic marker for atrial remodeling and atrial fibrillation. Therefore, we have investigated the correlation between dilatation of the IA with hemodynamic alterations of the left ventricle in patients with arterial hypertension. Objetive: Determine the relationship between arterial hypertension and left atrial dilatation. The same epidemiological characteristics of the study population and the echocardiographic differences between hypertensive patients and patients without HTN. Methodology: In this observational and prospective study we have investigated electrocardiographic variations, echocardiographic measurements and Holter ECG of 24 hours in hypertensive patients who attend a tertiary hospital from March 2018 to September 2018 as outpatients and inpatients. Results: 104 patients were studied, 65 known hypertensive patients and, 39 non-hypertensive as control group. The diameter of the AI had a mean of 37 ± 8 in hypertensive patients, while in non-hypertensive patients the mean was 34 ± 5 (p = 0.03). A significant association was found between hypertension and increased diameter of the LA (p = 0.04 OR: 2.6 CI 0.88-7.7). In hypertensive patients, a significant association was observed between the dilated left atrium and the decreased ejection fraction (p = 0.01 OR: 4.66 CI: 1.28- 16.98). In addition, a significant association between dilated LA and the increased diastolic diameter of the LV (p = 0.0004 OR: 8.75 IC 2.18-35.01). A significant association was observed between the presence of dilated IA and the left ventricular systolic diameter increased in hypertensive patients (p = 0.006 OR: 5.74 CI 1.5-21.91). Conclusion: There was a significant relationship between arterial hypertension and dilatation of the left atrium. Hypertensive patients with dilatation of the IA had a significant increase in systolic and diastolic diameters of the left ventricle, as well as a significant decrease in systolic functionality of the left ventricle. Therefore, hypertensive patients who have dilation of the left atrium also had associated hemodynamic alterations of the left ventricle. Key words: Dilation of the left atrium; Arterial hypertension; LV ejection fraction. Systolic and diastolicdiameter of the LV.


Subject(s)
Humans , Male , Female , Atrial Function, Left , Hypertension , Systole , Diastole
14.
Korean Circulation Journal ; : 238-248, 2019.
Article in English | WPRIM | ID: wpr-738779

ABSTRACT

BACKGROUND AND OBJECTIVES: Beta-blockers are indicated in patients with heart failure (HF) with reduced ejection fraction. However, their efficacy in patients with HF with preserved ejection fraction (HFpEF) is uncertain. We investigated the hypothesis that beta-blockers are associated with reduced adverse events in patients with HFpEF. METHODS: The Korea Acute Heart Failure (KorAHF) is a prospective observational multicentre cohort study. The 5,625 patients hospitalized for acute HF syndrome in 10 tertiary university hospitals across the country have been consecutively enrolled between March 2011 and February 2014. Of these patients, 2,152 patients with HFpEF (ejection fraction ≥40%) were investigated. The primary outcome was all-cause mortality according to beta-blocker use. RESULTS: During a median follow-up duration of 807 days, 702 patients died. In Cox proportional hazards model beta-blocker use was associated with a 14% reduced all-cause death (hazard ratio [HR], 0.86; 95% confidence interval [CI], 0.75–0.98), but not with reduce rehospitalization (HR, 1.03; 95% CI, 0.85–1.27). In the propensity-score matched population, beta-blockers were also associated with reduced all-cause death (HR, 0.80; 95% CI, 0.69–0.94) but not with reduced rehospitalization (HR, 1.08; 95% CI, 0.87–1.33). CONCLUSIONS: In Korean patients with HFpEF, use of beta-blockers is associated with reduced all-cause death but not with reduced rehospitalization.


Subject(s)
Cohort Studies , Diastole , Follow-Up Studies , Heart Failure , Heart , Hospitals, University , Humans , Korea , Mortality , Proportional Hazards Models , Prospective Studies
15.
Article in English | WPRIM | ID: wpr-758946

ABSTRACT

Unenhanced echocardiography (UE), commonly used in veterinary practice, is limited by left ventricular (LV) foreshortening and observer dependency. Contrast echocardiography (CE) was used to compare two-dimensional (2D) LV measurements made using UE and 256-row multi-detector computed tomography (MDCT) as a reference standard. Seven healthy beagle dogs were evaluated in this study. Measurements obtained using CE, including LV wall thickness, internal diameter, and longitudinal and transverse length, were significantly greater than those obtained using UE. Measurements of LV internal dimension in diastole (LVIDd) and systole (LVIDs) were significantly larger with CE compared UE. Regardless of the cardiac cycle, LV longitudinal (LVLd and LVLs) and transverse diameter (LVTDd and LVTDs) measurements were significantly different with CE and approximated values from MDCT. Among automatically calculated parameters, LV end-systolic volume and the relative wall thickness were significantly different between UE and CE. In CE, the correlation coefficients of 4 major parameters (r = 0.87 in LVIDd; 0.91 in LVIDs; 0.87 in LVLd; and 0.81 in LVLs) showed higher values compared to the UE (r = 0.68 in LVIDd, 0.71 in LVIDs, 0.69 in LVLd, and 0.35 in LVLs). Inter-observer agreement was highest for MDCT and higher for CE than UE. In conclusion, CE is more accurate and reproducible than UE in assessing 2D LV measurements and can overcome the limitations of UE including LV foreshortening and high observer dependency.


Subject(s)
Animals , Diastole , Dogs , Echocardiography , Multidetector Computed Tomography , Systole
16.
Article in English | WPRIM | ID: wpr-758920

ABSTRACT

This study aimed to assess the effects of dehydration on echocardiographic indices in healthy cats: specifically, it aimed to assess the effects of volume depletion on diastolic function. Nine experimental cats were subjected to both a dehydration and placebo protocol separated by a 21-day washout period. Echocardiography was performed at baseline and on completion of each protocol. Results were compared between the two protocols. Volume depletion was induced by intravenous administration of furosemide. Volume depletion showed a significant association with increased interventricular septal and left ventricular free wall thickness at end-diastole, decreased left ventricular internal diameter at end-diastole, and left atrial diameter at end-systole. The peak early (E) and late (A) diastolic filling velocities, and the peak early diastolic velocities (E′) were significantly decreased by dehydration. Volume depletion did not affect peak longitudinal strain rate during early diastole, E/A, or E/E′. Volume depletion significantly affected the echocardiographic diastolic indices and conventional echocardiographic parameters in healthy cats.


Subject(s)
Administration, Intravenous , Animals , Cats , Dehydration , Diastole , Echocardiography , Furosemide , Hypertrophy
17.
Article in English | WPRIM | ID: wpr-764361

ABSTRACT

BACKGROUND AND PURPOSE: The clinical implications of echocardiography findings for long-term outcomes in atrial fibrillation (AF)-related stroke patients are unknown. METHODS: This was a substudy of the Korean ATrial fibrillaTion EvaluatioN regisTry in Ischemic strOke patieNts (K-ATTENTION), which is a multicenter-based cohort comprising prospective stroke registries from 11 tertiary centers. Stroke survivors who underwent two-dimensional transthoracic echocardiography during hospitalization were enrolled. Echocardiography markers included the left-ventricle (LV) ejection fraction (LVEF), the left atrium diameter, and the ratio of the peak transmitral filling velocity to the mean mitral annular velocity during early diastole (E/e′ ratio). LVEF was categorized into normal (≥55%), mildly decreased (>40% and <55%), and severely decreased (≤40%). The E/e′ ratio associated with the LV filling pressure was categorized into normal (<8), borderline (≥8 and <15), and elevated (≥15). Kaplan-Meier and Cox regression analyses were performed for recurrent stroke, major adverse cardiac events, and all-cause death. RESULTS: This study finally included 1,947 patients. Over a median follow-up of 1.65 years (interquartile range, 0.42–2.87 years), the rates of recurrent stroke, major adverse cardiac events, and all-cause death were 35.1, 10.8, and 69.6 cases per 1,000 person-years, respectively. Multivariable analyses demonstrated that severely decreased LVEF was associated with a higher risks of major adverse cardiac events [hazard ratio (HR), 3.91; 95% confidence interval (CI), 1.58–9.69] and all-cause death (HR, 1.95; 95% CI, 1.23–3.10). The multivariable fractional polynomial plot indicated that recurrent stroke might be associated with a lower LVEF. CONCLUSIONS: Severe LV systolic dysfunction could be a determinant of long-term outcomes in AF-related stroke.


Subject(s)
Atrial Fibrillation , Cohort Studies , Diastole , Echocardiography , Follow-Up Studies , Heart Atria , Hospitalization , Humans , Prospective Studies , Registries , Stroke , Survivors
19.
Arch. endocrinol. metab. (Online) ; 62(4): 392-398, July-Aug. 2018. tab
Article in English | LILACS | ID: biblio-950084

ABSTRACT

ABSTRACT Objective: Treatment of subclinical hypothyroidism (ScH), especially the mild form of ScH, is controversial because thyroid hormones influence cardiac function. We investigate left ventricular systolic and diastolic function in ScH and evaluate the effect of 5-month levothyroxine treatment. Subjects and methods: Fifty-four patients with newly diagnosed mild ScH (4.2 <TSH < 10.0 mU/L) and 30 euthyroid subjects matched by age were analysed. Laboratory analyses and an echocardiography study were done at the first visit and after 5 months in euthyroid stage in patients with ScH. Results: Compared to healthy controls, patients with ScH had a lower E/A ratio (1.03 ± 0.29 vs. 1.26 ± 0.36, p < 0.01), higher E/e' sep. ratio (762 ± 2.29 vs. 6.04 ± 1.64, p < 0.01), higher myocardial performance index (MPI) (0.47 ± 0.08 vs. 0.43 ± 0.07, p < 0.05), lower global longitudinal strain (GLS) (-19.5 ± 2.3 vs. −20.9 ± 1.7%, p < 0.05), and lower S wave derived by tissue Doppler imaging (0.077 ± 0.013 vs. 0.092 ± 0.011 m/s, p < 0.01). Levothyroxine treatment in patients with ScH contributed to higher EF (62.9 ± 3.9 vs. 61.6 ± 4.4%, p < 0.05), lower E/e' sep. ratio (6.60 ± 2.06 vs. 762 ± 2.29, p < 0.01), lower MPI (0.43 ± 0.07 vs. 0.47 ± 0.08%, p < 0.01), and improved GLS (-20.07 ± 2.7 vs. −19.55 ± 2.3%, p < 0.05) compared to values in ScH patients at baseline. Furthermore, in all study populations (ScH patients before and after levothyroxine therapy and controls), TSH levels significantly negatively correlated with EF (r = −0.15, p < 0.05), E/A (r = −0.14, p < 0.05), GLS (r = −0.26, p < 0.001), and S/TDI (r = −0.22, p < 0.01) and positively correlated with E/e' sep. (r = 0.14, p < 0.05). Conclusion: Patients with subclinical hypothyroidism versus healthy individuals had subtle changes in certain parameters that indicate involvement of systolic and diastolic function of the left ventricle. Although the values of the parameters were in normal range, they were significantly different compared to ScH and the control group at baseline, as well as to the ScH groups before and after treatment.The results of our study suggest that patients with ScH must be followed up during treatment to assess improvement of the disease. Some of the echocardiography obtained parameters were reversible after levothyroxine therapy.


Subject(s)
Humans , Male , Female , Adult , Middle Aged , Systole/drug effects , Thyroxine/pharmacology , Ventricular Function, Left/drug effects , Diastole/drug effects , Hypothyroidism/drug therapy , Systole/physiology , Thyroxine/administration & dosage , Thyroxine/blood , Thyroxine/therapeutic use , Triiodothyronine/blood , Thyrotropin/blood , Case-Control Studies , Prospective Studies , Echocardiography, Doppler, Pulsed , Diastole/physiology , Heart Ventricles/physiopathology , Heart Ventricles/diagnostic imaging
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