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1.
Medicina UPB ; 40(2): 60-66, 13 oct. 2021.
Article in Spanish | LILACS, COLNAL | ID: biblio-1342230

ABSTRACT

El síndrome coronario agudo (SCA) es la principal causa de muerte, por esta razón, es fundamental reconocer sus características clínicas. Tradicionalmente ha sido descrito un cuadro denominado típico, consistente en dolor torácico retroesternal o en la región izquierda del tórax, explicado como una sensación de presión o pesadez, de duración superior a 20 minutos, que se puede irradiar a la extremidad superior izquierda o derecha, cuello o mandíbula, asociado a diaforesis y náuseas. Diversos grupos de pacientes como mujeres, diabéticos, ancianos y con antecedentes de falla cardiaca o accidente cerebrovascular presentan cuadros llamados atípicos, que en gran proporción no manifiestan dolor torácico. Varios estudios plantean que no hay síntomas suficientemente sensibles y específicos para ser considerados típicos en el contexto del SCA, por lo que el diagnóstico debe incluir además de la evaluación clínica, el electrocardiograma, los factores de riesgo y los biomarcadores. El uso de puntajes de riesgo como el HEART ha demostrado ser útil en este escenario.


Acute coronary syndrome (ACS) is the main cause of mortality around the world; the-refore, it is essential to recognize the clinical characteristics that increase its diagnostic suspicion. Traditionally, it has been defined as a so-called typical condition, consisting of retrosternal chest pain or pain in the left region of the thorax. It is described as a feeling of pressure or heaviness, lasting more than 20 minutes, which can radiate to the left or right upper limb, neck or jaw, and can be associated with diaphoresis and nau-sea. Various groups of patients such as women, diabetics, the elderly, and those with a history of heart failure or cerebrovascular accident, have so-called atypical clinical sets of symptoms, which in a large proportion may not present chest pain. Various studies suggest that there are not sufficiently sensitive and specific symptoms to be considered typical in the context of ACS, thus, the approach must include the electrocardiogram, risk factors and biomarkers in addition to the clinical evaluation. The use of risk scores such as the HEART has proven very useful in this scenario.


A síndrome coronariana aguda (SCA) é a principal causa de morte, por isso é fundamen-tal o reconhecimento de suas características clínicas. Tradicionalmente, é descrita uma condição dita típica, que consiste em dor torácica retroesternal ou na região esquerda do tórax, explicada como uma sensação de pressão ou peso, com duração superior a 20 minutos, que pode irradiar para a esquerda ou direita membro superior, pescoço ou mandíbula, associado a sudorese e náusea. Vários grupos de pacientes como mulheres, diabéticos, idosos e com história de insuficiência cardíaca ou acidente vascular cerebral apresentam condições atípicas, que em grande parte não manifestam dor no peito. Vários estudos sugerem que não existem sintomas suficientemente sensíveis e específicos para serem considerados típicos no contexto da SCA, de modo que o diagnóstico deve incluir, além da avaliação clínica, o eletrocardiograma, fatores de risco e biomarcadores. O uso de escores de risco, como o CORAÇÃO, tem se mostrado útil nesse cenário.


Subject(s)
Humans , Acute Coronary Syndrome , Chest Pain , Heart , Heart Failure
2.
Rev. cuba. pediatr ; 93(2): e1215, fig
Article in Spanish | LILACS, CUMED | ID: biblio-1280372

ABSTRACT

Introducción: El cierre prematuro del foramen oval o foramen oval restrictivo intraútero es una entidad clínica rara pero seria, de etiología desconocida. Puede ocasionar diversos defectos cardíacos, hipertensión pulmonar, insuficiencia cardiaca congestiva, hidrops fetal y muerte. El diagnóstico puede realizarse mediante ecocardiografía fetal, aunque en la mayoría de los casos sucede en autopsia posmortem. Objetivo: Describir un caso de hidrops fetal secundario al cierre prematuro del foramen oval intraútero. Presentación del caso: Recién nacido pretérmino de 34 semanas en el que, en ecografía y ecocardiografía prenatal se visualizó un aumento de las cavidades cardíacas asociado a cierre intrauterino de foramen oval e hidrops, hallazgos confirmados al nacimiento. Tras una prolongada estancia en unidad de cuidados intensivos neonatal y tratamiento con inotrópicos y diuréticos, se otorgó el alta hospitalaria con diagnóstico de cardiomiopatía dilatada secundaria a foramen oval restrictivo. Conclusiones: La asociación de cierre prematuro de foramen oval con hidrops fetal ha sido descripta en escasas publicaciones y es frecuente en estas la relación con muerte perinatal y con anomalías extracardíacas. En este caso se describe hidrops secundario al cierre temprano del foramen oval intraútero que condicionó a la dilatación global de cavidades cardíacas y a la disfunción ventricular severa persistentes más allá del periodo neonatal sin otras anomalías asociadas. A pesar de la severidad del compromiso cardiovascular, la evolución clínica fue favorable y permitió el egreso hospitalario. Es importante el reconocimiento temprano mediante ecografía y ecocardiografía fetal de estas entidades para guiar un diagnóstico y tratamiento oportunos(AU)


Introduction: Premature closure of the oval foramen or intrauterine restrictive oval foramen is a rare but serious clinical entity of unknown etiology. It can cause various heart defects, pulmonary hypertension, congestive heart failure, fetal hydrops and death. Diagnosis can be made by fetal echocardiography, although in most cases it occurs in postmortem autopsy. Objective: Describe the presentation of a case of fetal hydrops secondary to premature closure of the intrauterine oval foramen. Case presentation: A 34-week preterm newborn in which, in ultrasound and prenatal echocardiography, an increase in the cardiac chambers associated with intrauterine closure of oval foramen and hydrops was visualized; these findings were confirmed at birth. After a prolonged stay in the neonatal intensive care unit and treatment with inotropic and diuretic drugs, hospital discharge was granted with diagnosis of dilated cardiomyopathy secondary to restrictive oval foramen. Conclusions: The association of premature closure of oval foramen with fetal hydrops has been described in few publications and it is common in these the relation with perinatal death and extracardiac abnormalities. In this case, it is described hydrops secondary to the early closure of the intrauterine oval foramen that conditioned the overall dilation of heart chambers, and persistent severe ventricular dysfunction beyond the neonatal period without other associated abnormalities. Despite the severity of cardiovascular compromising, clinical evolution was favorable and allowed hospital discharge. Early recognition using ultrasound and fetal echocardiography of these entities is important to guide timely diagnosis and treatment(AU)


Subject(s)
Humans , Infant, Newborn , Cardiomyopathy, Dilated , Hydrops Fetalis , Intensive Care, Neonatal , Ventricular Dysfunction , Foramen Ovale , Heart
3.
Iatreia ; 34(1): 64-70, ene.-mar. 2021. graf
Article in Spanish | LILACS | ID: biblio-1154359

ABSTRACT

RESUMEN La amiloidosis AL (antes denominada amiloidosis primaria) es una entidad sistémica poco frecuente, con incidencia desconocida en el mundo, que puede llegar a presentar compromiso cardíaco en casi la mitad de los pacientes, llevando a una cardiomiopatía restrictiva por depósito de tejido amiloide. A continuación, presentamos 3 casos de pacientes que consultaron por falla cardíaca aguda y síncope, en quienes finalmente se confirmó el diagnóstico de amiloidosis AL. Al final, se realiza una breve revisión de la literatura, enfatizando en los elementos clínicos para un diagnóstico temprano.


SUMMARY AL amyloidosis (formerly called primary amyloidosis) is a rare systemic entity, with an unknown incidence in the world, which can develop heart involvement in almost half of patients, leading to restrictive cardiomyopathy by amyloid tissue deposit. We present 3 cases of patients who consulted for acute heart failure and syncope, in which the diagnosis of AL amyloidosis was finally confirmed. We conclude with a brief review of the literature, emphasizing clinical elements for an early diagnosis.


Subject(s)
Humans , Aged , Syncope , Heart Failure , Amyloid , Cardiomyopathy, Restrictive , Heart
4.
Rev. cuba. invest. bioméd ; 40(1): e846, ene.-mar. 2021. tab, graf
Article in Spanish | LILACS, CUMED | ID: biblio-1289441

ABSTRACT

Introducción: Los valores de la frecuencia cardiaca normales y anormales registrados en los equipos electrocardiográficos ambulatorios o continuos han sido caracterizados mediante nuevas metodologías diagnósticas, las cuales se han desarrollado en el contexto de la teoría de los sistemas dinámicos y la entropía. Objetivo: Evaluar la dinámica cardiaca de adultos, teniendo en cuenta su comportamiento en el contexto de la teoría de sistemas dinámicos y las proporciones de la entropía mediante un estudio ciego. Métodos: Se realizó una prueba diagnóstica mediante un estudio ciego de 500 Holter, aplicando una nueva metodología basada en las proporciones de la entropía del atractor numérico construido con los valores registrados en el Holter. Para esto, los valores máximos y mínimos de la frecuencia cardiaca para cada hora, así como el número de latidos, fueron tomados de cada Holter durante, mínimo, 18 horas. Con estos valores se generó un atractor numérico que cuantificó la probabilidad de parejas de frecuencias cardiacas consecutivas. Se evaluó cada dinámica a partir de los valores de entropía y de sus proporciones. Posteriormente, estos resultados fueron comparados con la evaluación clínica convencional estimando la sensibilidad y especificidad, así como el coeficiente Kappa. Resultados: Se encontraron diferencias entre la dinámica de casos normales y anormales, en las dinámicas cardiacas evaluadas en 18 horas, hallando valores de sensibilidad y especificidad del 100 por ciento y coeficiente Kappa de uno, respecto al diagnóstico clínico convencional. Conclusiones: Los valores de entropía y de sus proporciones permiten diferenciar cuantitativamente la normalidad de la enfermedad en la dinámica cardiaca, durante un mínimo de 18 horas(AU)


Introduction: The normal and abnormal heart rate values recorded on ambulatory or continuous electrocardiographic devices have been characterized with novel diagnostic methodologies developed in the context of dynamic systems and entropy theory. Objective: Through a blind study, evaluate the heart dynamics of adults taking into account their behavior in the context of dynamic systems theory and entropy proportions. Methods: A diagnostic test was conducted through a 500 Holter blind study, applying a novel methodology based on the entropy proportions of the numerical attractor constructed with the values registered on the Holter device. To achieve this end, maximum and minimum heart rate values for each hour, as well as the number of beats, were obtained from each Holter device for at least 18 hours. Based on these values, a numerical attractor was generated which quantified the probability of consecutive heart rate pairs. Each dynamic was evaluated in terms of entropy values and their proportions. These results were then compared with the conventional clinical evaluation, estimating the sensitivity and specificity as well as the kappa coefficient. Results: Differences were found between the dynamics of normal and abnormal cases, in the heart dynamics evaluated in 18 hours, finding sensitivity and specificity values of 100 percent and a kappa coefficient of 1, with respect to conventional clinical diagnosis. Conclusions: Entropy values and their proportions make it possible to quantitatively differentiate the normality of the disease in heart dynamics for a minimum of 18 hours(AU)


Subject(s)
Humans , Behavior , Clinical Diagnosis , Equipment and Supplies , Gender Identity , Heart , Heart Rate/physiology , Diagnostic Tests, Routine
6.
Rev. Eugenio Espejo ; 15(1): 54-65, 20210102.
Article in Spanish | LILACS | ID: biblio-1145491

ABSTRACT

El Síndrome de Eisenmenger es un desorden multisistémico caracterizado por hipertensión pulmonar con inversión o bidireccionalidad del flujo a través de una comunicación intracardiaca o aortopulmonar. Se presenta el caso de un paciente masculino de 48 años de edad con antece- dentes de Hipertensión Pulmonar e Insuficiencia Cardíaca en tratamiento, quien acude por cuadro de melenas, decaimiento e inestabilidad hemodinámica. Al examen físico se ausculta soplo sistólico ascendente en foco pulmonar, abdomen distendido con presencia de onda ascíti- ca. En los exámenes complementarios; la radiografía convencional de tórax mostró aumento de la trama vascular pulmonar, además de encontrarse alteraciones electrocardiográficas. El paciente mostró una evolución desfavorable produciéndose falla cardíaca, que dio lugar al posterior fallecimiento debido a un paro cardiorrespiratorio.


Eisenmenger Syndrome is a multisystemic disorder identified by pulmonary hypertension with reversal or bidirectional flow through intracardiac or aortopulmonary communication. The case of a 48-year-old male patient with a history of Pulmonary Hypertension and Heart Failure in treatment is presented, who comes due to mane of mane, decay, and hemodynamic instability. The physical examination auscultated systolic murmur ascending in pulmonary focus, distended abdomen with presence of ascites wave. In the complementary exams, conventional chest x-ray, increased pulmonary vascular weft, in addition to finding electrocardiographic abnormalities. The patient seemed an unfavorable evolution, producing a heart failure, which resulted in subse- quent death due to cardiorespiratory arrest.


Subject(s)
Humans , Male , Middle Aged , Syndrome , Eisenmenger Complex , Hypertension, Pulmonary , Patients , Thorax , Heart
7.
Pesqui. vet. bras ; 41: e06724, 2021. ilus
Article in English | ID: biblio-1250481

ABSTRACT

This study reported the epidemiological data and the clinical and pathological conditions of spontaneous poisoning by Ateleia glazioviana in sheep and goats in the West region of Santa Catarina. The small ruminants were located in a place where there was a large amount of young plants of A. glazioviana and showing signs of consumption. The stock of sheep was composed of 250 animals, of which 45 died. In the goat herd, there were 28 animals, and of these, 27 died, and one was sacrificed. The main clinical signs were weight loss, fatigue, slow-walk, and eventually submandibular and facial edema. Some animals were found dead, and others died suddenly after being moved. Abortions and the birth of weak lambs were also observed. In total, five sheep and one goat were necropsied. The main macroscopic lesions were associated to eccentric cardiac hypertrophy and moderate, multifocal white areas in the epicardium and myocardium. Two sheep showed marked edema in the subcutaneous tissue of the head and neck and it could be noted hydrothorax and hydroperitoneum and liver with a nutmeg-like appearance. Histological changes were relevant in the myocardium. They consisted of fibrosis and myofiber necrosis associated with macrophage infiltrate, multifocal, low and marked swelling of cardiomyocytes with loss of fibrillarystriae, and increased nuclear volume. In two sheep, there was still congenital hepatic, as well as marked centrilobular and diffuse areas.(AU)


Descrevem-se dados epidemiológicos, sinais clínicos e lesões da intoxicação espontânea por Ateleia glazioviana em ovinos e caprinos no Oeste de Santa Catarina. Os ovinos e caprinos se encontravam em um local que havia grande quantidade de A. glazioviana jovem e com sinais de consumo. O plantel de ovinos era composto por 250 animais, dos quais 45 morreram. No rebanho caprino haviam 28 animais e destes, 27 morreram e um foi sacrificado. Os principais sinais clínicos se caracterizaram por perda de peso, cansaço, caminhar lento e eventualmente edema submandibular e facial. Alguns foram encontrados mortos e outros morreram subitamente após serem movimentados. Abortos e nascimento de cordeiros fracos também foi observado. No total, cinco ovinos e um caprino foram necropsiados. As principais lesões macroscópicas foram hipertrofia excêntrica do coração e áreas brancas multifocais, moderadas, no epicárdio e miocárdio. Dois ovinos apresentaram edema acentuado no tecido subcutâneo da cabeça e pescoço, bem como hidrotórax, hidroperitôneo e fígado com aspecto de noz-moscada. As alterações histológicas foram relevantes no miocárdio e consistiram de áreas de fibrose e necrose de miofibras associada à infiltrado de macrófagos, multifocal, leve, além de tumefação acentuada de cardiomiócitos com perda das estrias fibrilares e aumento do volume nuclear. Em dois ovinos, havia ainda, congestão hepática, centrolobular, difusa.(AU)


Subject(s)
Animals , Plants/toxicity , Poisoning , Signs and Symptoms , Goats/physiology , Sheep/physiology , Heart , Heart Failure
8.
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
9.
Article in Chinese | WPRIM | ID: wpr-880438

ABSTRACT

In order to solve the problems of slow operation speed and low registration accuracy of thin plate spline (TPS) interpolation method for motion vector field in coronary computed tomography angiography (CTA), a multi-level B-spline interpolation method (MBS) with uniform grid is proposed. On the one hand, the interpolation method used local B-spline to refine the sparse mesh layer by layer in a multiscale way to improve the accuracy of registration. On the other hand, it used the splitting matrix method to interpolate the motion vector field, greatly reducing the operation time of interpolation. The experimental results show that the proposed method can be used for CTA image registration efficiently.


Subject(s)
Algorithms , Computed Tomography Angiography , Heart , Motion , Tomography, X-Ray Computed
10.
Repert. med. cir ; 30(1): 64-67, 2021. ilus.
Article in English, Spanish | LILACS, COLNAL | ID: biblio-1292233

ABSTRACT

La pseudodextrocardia se ha definido como un desplazamiento irregular del corazón y sus estructuras vasculares hacia la derecha por causas extracardiacas. Es un hallazgo ocasional en estudios imagenológicos de tórax o abdomen y varía acorde con las diferentes relaciones causales. Se presenta el caso de un paciente con una neumopatía crónica, quien a su ingreso presenta pseudodextrocardia como hallazgo incidental.


Pseudo-dextrocardia has been defined as an unusual displacement of the heart and its vascular structures to the right secondary to extracardiac causes. It is an occasional finding in thoracic or abdominal imaging studies and varies according to the various causal relationships. We report a case of pseudo-dextrocardia as an incidental finding in a patient admitted with chronic pulmonary disease.


Subject(s)
Humans , Male , Aged, 80 and over , Dextrocardia/diagnostic imaging , Heart/diagnostic imaging , Mediastinum/diagnostic imaging , Thorax , Dextrocardia
11.
ABC., imagem cardiovasc ; 34(3)2021. tab, graf
Article in Portuguese | LILACS | ID: biblio-1292025

ABSTRACT

Fundamento: A identificação precoce do dano miocárdico parece ser importante na abordagem do paciente com doença de Chagas. A ecocardiografia com strain obtida por speckle tracking e a avaliação da fibrose miocárdica por meio da ressonância magnética cardíaca podem ser métodos diagnósticos promissores nesse sentido. Objetivo: Avaliar o acometimento miocárdico especificamente na forma crônica cardíaca leve da doença de Chagas por meio do strain por speckle tracking e da fibrose miocárdica pela ressonância magnética cardíaca, além de suas correlações. Método: Estudo de corte transversal que analisou portadores da forma cardíaca crônica leve da doença de Chagas (fração de ejeção preservada) submetidos à ecocardiografia com strain por speckle tracking e à ressonância magnética cardíaca. Resultados: Foram incluídos 21 participantes (mulheres: 62%; idade: 54 ± 5 anos). A prevalência de fibrose miocárdica por meio do realce tardio miocárdico foi de 50%. O strain longitudinal global encontrava-se diminuído em 17 pacientes (81%), com mediana de 14,1% (intervalo interquartil de 12,1 a 16,3). Os valores do mapa T1 encontravam-se, em média, elevados nos portadores de doença de Chagas (993 ± 163 ms). O mapa T1 foi significativamente correlacionado com o strain longitudinal global (r= 0,634; p = 0,015). Além disso, o índice de dispersão mecânica, obtido por strain, estava aumentado (> 55 ms) em 84%, com a maior área sob a curva Característica de Operação do Receptor (área sob a curva de 0,696; intervalo de confiança de 95% de 0,412-0,981) para discriminação de fibrose pelo realce tardio miocárdico. Conclusão: O strain miocárdico e o mapa T1 se comportam como marcadores precoces do dano miocárdico na cardiopatia chagásica crônica leve. O índice de dispersão mecânica estava elevado e foi o parâmetro que melhor se correlacionou com o realce tardio miocárdico. (AU)


Background: The early identification of myocardial damage seems important in the management of patients with Chagas disease. However, it is unknown whether speckle tracking echocardiography strain and cardiac magnetic resonance imaging are promising methods for assessing myocardial involvement and fibrosis, respectively. Objective: To evaluate myocardial involvement in the mild chronic cardiac form of Chagas disease using speckle tracking strain and myocardial fibrosis by cardiac magnetic resonance and assess their correlations. Method: This cross-sectional study analyzed patients with the mild chronic cardiac form of Chagas disease (preserved ejection fraction) using speckle tracking echocardiography and cardiac magnetic resonance. Results: The study included 21 participants (women: 62%; age: 54 ± 5 years). The prevalence of myocardial fibrosis was 50% on delayed myocardial enhancement. The median global longitudinal strain was decreased (14.1%; interquartile range, 12.1­16.3%) in 17 patients (81%). The mean T1 mapping value was high in patients with Chagas disease (993 ± 163 ms). The T1 map was significantly correlated with the global longitudinal strain (r = 0.634; p = 0.015). In addition, the mechanical dispersion index obtained by strain was increased (>55 ms) by 84%, with the largest area under the receiver operating characteristic curve (area under the curve, 0.696; 95% confidence interval, 0.412­0.981) for fibrosis discrimination by delayed myocardial enhancement. Conclusion: Myocardial strain and T1 mapping are early markers of myocardial damage in mild chronic Chagas heart disease. The mechanical dispersion index was high and the most closely correlated with delayed myocardial enhancement. (AU)


Subject(s)
Humans , Male , Female , Middle Aged , Chagas Cardiomyopathy/physiopathology , Chagas Cardiomyopathy/diagnostic imaging , Heart/diagnostic imaging , Myocardium/pathology , Prognosis , Stroke Volume , Fibrosis , Magnetic Resonance Imaging , Echocardiography/methods , Linear Models , Chronic Disease , Cross-Sectional Studies , ROC Curve
12.
Autops. Case Rep ; 11: e2021246, 2021. graf
Article in English | LILACS | ID: biblio-1153187

ABSTRACT

Extranodal NK/T-cell lymphoma, nasal type (ENKTL-NT) is a rare type of Non-Hodgkin's lymphoma, which usually presents with extranodal involvement and affects the nasal/upper aerodigestive tract in the classical presentation. Herein, we report the case of a 31-year-old, previously healthy, male patient diagnosed with ENKTL-NT with the involvement of the lung parenchyma and heart. Unfortunately, due to the rapid disease progression, the diagnosis was performed only at the autopsy. The authors highlight the rare clinical presentation of this type of lymphoma, as well as the challenging anatomopathological diagnosis in necrotic samples.


Subject(s)
Humans , Male , Adult , Nose Neoplasms/pathology , Lymphoma, Extranodal NK-T-Cell/pathology , Nasal Cavity/pathology , Autopsy , Lymphoma, T-Cell , Fatal Outcome , Herpesvirus 4, Human , Disease Progression , Heart , Lung/pathology
13.
Rev. cuba. invest. bioméd ; 40(supl.1): e1506, 2021. tab, graf
Article in Spanish | LILACS, CUMED | ID: biblio-1289474

ABSTRACT

Introducción: El paracetamol es uno de los antiinflamatorios no esteroideos con efecto analgésico y antipirético más utilizados a nivel mundial. Pocos estudios se enfocan en esclarecer los mecanismos de acción a nivel cardiovascular. Objetivos: Evaluar la acción del paracetamol sobre la fuerza de contracción de anillos de aorta torácica y sobre la actividad eléctrica y contráctil de corazones aislados y perfundidos de ratas Wistar. Métodos: Se midieron los efectos del paracetamol sobre anillos de aorta de rata denudados de su endotelio vascular. Se estudiaron las acciones del fármaco sobre los corazones aislados y perfundidos de las ratas por el método de Langendorff. Se evaluó la amplitud de la fuerza de contracción cardiaca y los intervalos QT, QTc, QRS y RR del electrocardiograma. Las condiciones (control y presencia de paracetamol) fueron comparadas con una prueba t de Student para muestras pareadas (p < 0,05), previa comprobación de la normalidad de los datos. Resultados: El paracetamol no tuvo efectos sobre el músculo liso vascular de los anillos aórticos ni sobre los intervalos QT, QTc, QRS y RR del electrocardiograma bajo ninguna de las concentraciones empleadas. Por otra parte, mostró efecto inotrópico negativo estadísticamente significativo en los corazones aislados, de forma dependiente de la concentración del fármaco. La IC50 estimada para la inhibición de la fuerza de contracción cardiaca fue de 17,15 ± 5,33 µmol/L. Conclusiones: Las acciones cardiovasculares directas del paracetamol son modestas, lo cual contribuye al buen margen de seguridad para su uso en clínica, en pacientes sin enfermedad cardiovascular(AU)


Introduction: Paracetamol is among the non-steroidal anti-inflammatory, analgesic and antipyretic drugs most commonly used worldwide. Few studies have focused on clarifying its mechanisms of action on a cardiovascular level. Objectives: Evaluate the action of paracetamol on the force of contraction of thoracic aortic rings and on the electrical and contractile activity of isolated perfused Wistar rat hearts. Methods: Measurements were taken of the effects of paracetamol on rat aortic rings denuded of their vascular endothelium. Analysis was performed of the actions of the drug on the isolated perfused rat hearts using the Langendorff method. Evaluation was conducted of the amplitude of the force of cardiac contraction and of intervals QT, QTc, QRS and RR of the electrocardiogram. The conditions (control and presence of paracetamol) were compared with a paired samples Student's t-test (p < 0.05) upon verification of the normality of the data. Results: Paracetamol had no effects on the vascular smooth muscle of aortic rings or on intervals QT, QTc, QRS and RR of the electrocardiogram at none of the concentrations used. On the other hand, it displayed a statistically significant negative inotropic effect on the isolated hearts dependent on drug concentration. The IC50 estimated for inhibition of the force of cardiac contraction was 17.15 ± 5.33 µmol/L. Conclusions: The direct cardiovascular actions of paracetamol are modest, which contributes to a good safety margin for its clinical use in patients without cardiovascular disease(AU)


Subject(s)
Humans , Cardiovascular Diseases/prevention & control , Anti-Inflammatory Agents, Non-Steroidal , Heart , Acetaminophen/analysis
17.
Braz. j. med. biol. res ; 54(10): e10669, 2021. tab, graf
Article in English | LILACS | ID: biblio-1285654

ABSTRACT

Mechanisms involved in cardiac function and calcium (Ca2+) handling in obese-resistant (OR) rats are still poorly determined. We tested the hypothesis that unsaturated high-fat diet (HFD) promotes myocardial dysfunction in OR rats, which it is related to Ca2+ handling. In addition, we questioned whether exercise training (ET) becomes a therapeutic strategy. Male Wistar rats (n=80) were randomized to standard or HFD diets for 20 weeks. The rats were redistributed for the absence or presence of ET and OR: control (C; n=12), control + ET (CET; n=14), obese-resistant (OR; n=9), and obese-resistant + ET (ORET; n=10). Trained rats were subjected to aerobic training protocol with progressive intensity (55-70% of the maximum running speed) and duration (15 to 60 min/day) for 12 weeks. Nutritional, metabolic, and cardiovascular parameters were determined. Cardiac function and Ca2+ handling tests were performed in isolated left ventricle (LV) papillary muscle. OR rats showed cardiac atrophy with reduced collagen levels, but there was myocardial dysfunction. ET was efficient in improving most parameters of body composition. However, the mechanical properties and Ca2+ handling from isolated papillary muscle were similar among groups. Aerobic ET does not promote morphological and cardiac functional adaptation under the condition of OR.


Subject(s)
Animals , Male , Rats , Physical Conditioning, Animal , Obesity , Rats, Wistar , Diet, High-Fat/adverse effects , Heart
18.
Pesqui. vet. bras ; 40(12): 1002-1009, Dec. 2020. tab, ilus
Article in English | ID: biblio-1155035

ABSTRACT

Chronic kidney disease (CKD) is characterized by irreversible morphostructural lesions that can progressively evolve to chronic renal insufficiency and kidney failure. It is known that the heart and kidneys are closely related, and that communication between these organs occurs through a variety of pathways; subtle physiological changes in one of them are compensated by the other. Histopathological cardiac evaluation through routine staining presents a limitation to identify specific or discreet lesions in the cardiomyocytes. This study aimed to evaluate serum troponin levels in cats with CKD, associated with clinical and pathological findings, as well as to correlate the morphostructural cardiac lesions to determine their distribution through macroscopic and histological assessments and anti-cardiac troponin C (cTnC) immunohistochemistry (IHC). To this end, 20 cats (18 diagnosed with CKD and two controls) were selected. Anti-human cTnC IHC was conducted after necropsy and separation in eight regions of each collected heart. Heart fragments from two cats without CKD were used as controls. The anti-human cTnC antibody is useful in detecting cardiac lesions and has shown decreased expression in cardiomyocytes of cats with CKD. Serum troponin was above the reference values in 11/18 (61.11%) animals and decreased expression for the cTnC antibody was observed in individual cardiomyocytes in 9/18 (50%) animals. It was verified that the number of regions with decreased expression for the cTnC antibody in cardiomyocytes is significantly correlated with serum troponin. The anti-human cTnC antibody has been found effective in detecting cardiac lesions and has shown decreased expression in the cardiomyocytes of cats with CKD. Correlation was observed between increased serum cTnI and loss of immunoreactivity at anti-cTnC antibody IHC in cats with CKD, which proves damage to cardiomyocytes secondary to kidney disease.(AU)


A doença renal crônica (DRC) é caracterizada por lesões morfoestruturais irreversíveis, que podem evoluir progressivamente para insuficiência renal crônica e falência renal. Sabe-se que o coração e os rins mantêm estreita relação e a comunicação entre esses órgãos ocorre por uma variedade de vias; alterações fisiológicas sutis em um desses órgãos são compensadas pelo outro. A avaliação histopatológica cardíaca mediante a colorações rotineiras são limitadas para identificar lesões específicas ou discretas em cardiomiócitos. O presente trabalho teve como objetivos avaliar os níveis séricos de troponina em gatos com DRC, associados aos achados clínico-patológicos, bem como correlacionar as lesões cardíacas morfoestruturais, a fim de determinar a distribuição destas, por meio da avaliação macroscópica, histológica e imuno-histoquímica com anti-cTnC. Neste estudo foram selecionados 20 gatos (18 diagnosticados com DRC e 2 animais controle). Para a aplicação da técnica de imuno-histoquímica anti-troponina C humana, necropsias foram realizadas e cada coração coletado separadamente em 8 regiões. Fragmentos do coração de 2 gatos sem lesão cardíaca foram utilizados como controle. O anticorpo anti-TnC humano é útil na detecção de lesões cardíacas e apresentou expressão diminuída em cardiomiócitos de gatos com DRC. Em 11/18 animais (61,11%) a troponina sérica encontrava-se acima dos valores de referência e foram observadas diminuição da expressão para anticorpo-cTnC em cardiomiócitos individuais em 9/18 (50%). Notou-se que o número de regiões com diminuição da expressão para anticorpo-cTnC em cardiomiócitos está significativamente correlacionado com a troponina sérica. O anticorpo anti-TnC humano se mostrou eficaz para detectar lesões cardíacas e demonstrou diminuição da expressão nos cardiomiócitos de gatos com DRC. Houve correlação entre o aumento da CTnI sérica e perda da imunorretividade na avaliação imuno-histoquímica com anticorpo anti-TnC em gatos com DRC o que comprova danos em cardiomiócitos secundários a doença renal.(AU)


Subject(s)
Animals , Cats , Immunohistochemistry , Cats/injuries , Heart , Kidney , Kidney Diseases/diagnosis , Kidney Diseases/pathology , Troponin
20.
Arq. bras. cardiol ; 115(5): 967-970, nov. 2020. graf
Article in Portuguese | LILACS, SES-SP | ID: biblio-1142248

ABSTRACT

Resumo No presente trabalho investigou-se o efeito inotrópico do acetato de eugenil (AE), bem como sua ação sobre a corrente de Ca2+ do tipo L (ICa,L). Os experimentos de contratilidade foram realizados em átrio esquerdo isolado de cobaia exposto às concentrações crescentes da droga (1 a 5.000μM). O AE reduziu a força de contração atrial (IC50=558±24,06μM) de modo dependente de concentração. O efeito do AE sobre a ICa,L também foi avaliado em cardiomiócitos ventriculares isolados de camundongos, utilizando-se a técnica de "patch-clamp". O AE apresentou um efeito inibitório (IC50=1.337±221μM) sobre os canais de Ca2+ sensíveis à voltagem (CaV1.2). Em conclusão, o AE apesenta efeito cardiodepressor que se deve, pelo menos em parte, à diminuição da entrada de Ca2+ nos cardiomiócitos.


Subject(s)
Animals , Rodentia , Eugenol/analogs & derivatives , Heart
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