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1.
Eur Heart J Qual Care Clin Outcomes ; 10(1): 66-76, 2024 Jan 12.
Article in English | MEDLINE | ID: mdl-36972621

ABSTRACT

BACKGROUND AND AIMS: The Tracking Outcomes and Practice in Pediatric Pulmonary Hypertension (TOPP) registry is a global network established to gain insights into the disease course and long-term outcomes of paediatric pulmonary arterial hypertension (PAH). Previously published cohorts in paediatric PAH are obscured by survival bias due to the inclusion of both prevalent (previously diagnosed) and incident (newly diagnosed) patients. The current study aims to describe long-term outcome and its predictors in paediatric PAH, exclusively of newly diagnosed patients. METHODS AND RESULTS: Five hundred thirty-one children with confirmed pulmonary hypertension, aged ≥3 months and <18 years, were enrolled in the real-world TOPP registry at 33 centres in 20 countries, from 2008 to 2015. Of these, 242 children with newly diagnosed PAH with at least one follow-up visit were included in the current outcome analyses. During long-term follow-up, 42 (17.4%) children died, 9 (3.7%) underwent lung transplantation, 3 (1.2%) atrial septostomy, and 9 (3.7%) Potts shunt palliation (event rates: 6.2, 1.3, 0.4, and 1.4 events per 100 person-years, respectively). One-, three-, and five-year survival free from adverse outcome was 83.9%, 75.2%, and 71.8%, respectively.Overall, children with open (unrepaired or residual) cardiac shunts had the best survival rates. Younger age, worse World Health Organization functional class, and higher pulmonary vascular resistance index were identified as independent predictors of long-term adverse outcome. Younger age, higher mean right atrial pressure, and lower systemic venous oxygen saturation were specifically identified as independent predictors of early adverse outcome (within 12 months after enrolment). CONCLUSION: This comprehensive analysis of survival from time of diagnosis in a large exclusive cohort of children newly diagnosed with PAH describes current-era outcome and its predictors.


Subject(s)
Hypertension, Pulmonary , Pulmonary Arterial Hypertension , Child , Humans , Infant , Pulmonary Arterial Hypertension/diagnosis , Pulmonary Arterial Hypertension/epidemiology , Hypertension, Pulmonary/diagnosis , Hypertension, Pulmonary/epidemiology , Familial Primary Pulmonary Hypertension , Disease Progression , Registries
2.
PLOS Digit Health ; 2(9): e0000324, 2023 Sep.
Article in English | MEDLINE | ID: mdl-37695769

ABSTRACT

Cardiac auscultation is an accessible diagnostic screening tool that can help to identify patients with heart murmurs, who may need follow-up diagnostic screening and treatment for abnormal cardiac function. However, experts are needed to interpret the heart sounds, limiting the accessibility of cardiac auscultation in resource-constrained environments. Therefore, the George B. Moody PhysioNet Challenge 2022 invited teams to develop algorithmic approaches for detecting heart murmurs and abnormal cardiac function from phonocardiogram (PCG) recordings of heart sounds. For the Challenge, we sourced 5272 PCG recordings from 1452 primarily pediatric patients in rural Brazil, and we invited teams to implement diagnostic screening algorithms for detecting heart murmurs and abnormal cardiac function from the recordings. We required the participants to submit the complete training and inference code for their algorithms, improving the transparency, reproducibility, and utility of their work. We also devised an evaluation metric that considered the costs of screening, diagnosis, misdiagnosis, and treatment, allowing us to investigate the benefits of algorithmic diagnostic screening and facilitate the development of more clinically relevant algorithms. We received 779 algorithms from 87 teams during the Challenge, resulting in 53 working codebases for detecting heart murmurs and abnormal cardiac function from PCG recordings. These algorithms represent a diversity of approaches from both academia and industry, including methods that use more traditional machine learning techniques with engineered clinical and statistical features as well as methods that rely primarily on deep learning models to discover informative features. The use of heart sound recordings for identifying heart murmurs and abnormal cardiac function allowed us to explore the potential of algorithmic approaches for providing more accessible diagnostic screening in resource-constrained environments. The submission of working, open-source algorithms and the use of novel evaluation metrics supported the reproducibility, generalizability, and clinical relevance of the research from the Challenge.

3.
Cardiol Young ; 33(8): 1277-1287, 2023 Aug.
Article in English | MEDLINE | ID: mdl-37615116

ABSTRACT

The Eighth World Congress of Pediatric Cardiology and Cardiac Surgery (WCPCCS) will be held in Washington DC, USA, from Saturday, 26 August, 2023 to Friday, 1 September, 2023, inclusive. The Eighth World Congress of Pediatric Cardiology and Cardiac Surgery will be the largest and most comprehensive scientific meeting dedicated to paediatric and congenital cardiac care ever held. At the time of the writing of this manuscript, The Eighth World Congress of Pediatric Cardiology and Cardiac Surgery has 5,037 registered attendees (and rising) from 117 countries, a truly diverse and international faculty of over 925 individuals from 89 countries, over 2,000 individual abstracts and poster presenters from 101 countries, and a Best Abstract Competition featuring 153 oral abstracts from 34 countries. For information about the Eighth World Congress of Pediatric Cardiology and Cardiac Surgery, please visit the following website: [www.WCPCCS2023.org]. The purpose of this manuscript is to review the activities related to global health and advocacy that will occur at the Eighth World Congress of Pediatric Cardiology and Cardiac Surgery.Acknowledging the need for urgent change, we wanted to take the opportunity to bring a common voice to the global community and issue the Washington DC WCPCCS Call to Action on Addressing the Global Burden of Pediatric and Congenital Heart Diseases. A copy of this Washington DC WCPCCS Call to Action is provided in the Appendix of this manuscript. This Washington DC WCPCCS Call to Action is an initiative aimed at increasing awareness of the global burden, promoting the development of sustainable care systems, and improving access to high quality and equitable healthcare for children with heart disease as well as adults with congenital heart disease worldwide.


Subject(s)
Cardiac Surgical Procedures , Cardiology , Heart Diseases , Adult , Child , Humans
4.
Cardiol Young ; 32(2): 185-197, 2022 Feb.
Article in English | MEDLINE | ID: mdl-33843546

ABSTRACT

Despite enormous strides in our field with respect to patient care, there has been surprisingly limited dialogue on how to train and educate the next generation of congenital cardiologists. This paper reviews the current status of training and evolving developments in medical education pertinent to congenital cardiology. The adoption of competency-based medical education has been lauded as a robust framework for contemporary medical education over the last two decades. However, inconsistencies in frameworks across different jurisdictions remain, and bridging gaps between competency frameworks and clinical practice has proved challenging. Entrustable professional activities have been proposed as a solution, but integration of such activities into busy clinical cardiology practices will present its own challenges. Consequently, this pivot towards a more structured approach to medical education necessitates the widespread availability of appropriately trained medical educationalists, a development that will better inform curriculum development, instructional design, and assessment. Differentiation between superficial and deep learning, the vital role of rich formative feedback and coaching, should guide our trainees to become self-regulated learners, capable of critical reasoning yet retaining an awareness of uncertainty and ambiguity. Furthermore, disruptive innovations such as "technology enhanced learning" may be leveraged to improve education, especially for trainees from low- and middle-income countries. Each of these initiatives will require resources, widespread advocacy and raised awareness, and publication of supporting data, and so it is especially gratifying that Cardiology in the Young has fostered a progressive approach, agreeing to publish one or two articles in each journal issue in this domain.


Subject(s)
COVID-19 , Cardiologists , Cardiology , Education, Medical , Cardiology/education , Curriculum , Humans , SARS-CoV-2
5.
IEEE J Biomed Health Inform ; 26(6): 2524-2535, 2022 06.
Article in English | MEDLINE | ID: mdl-34932490

ABSTRACT

Cardiac auscultation is one of the most cost-effective techniques used to detect and identify many heart conditions. Computer-assisted decision systems based on auscultation can support physicians in their decisions. Unfortunately, the application of such systems in clinical trials is still minimal since most of them only aim to detect the presence of extra or abnormal waves in the phonocardiogram signal, i.e., only a binary ground truth variable (normal vs abnormal) is provided. This is mainly due to the lack of large publicly available datasets, where a more detailed description of such abnormal waves (e.g., cardiac murmurs) exists. To pave the way to more effective research on healthcare recommendation systems based on auscultation, our team has prepared the currently largest pediatric heart sound dataset. A total of 5282 recordings have been collected from the four main auscultation locations of 1568 patients, in the process, 215780 heart sounds have been manually annotated. Furthermore, and for the first time, each cardiac murmur has been manually annotated by an expert annotator according to its timing, shape, pitch, grading, and quality. In addition, the auscultation locations where the murmur is present were identified as well as the auscultation location where the murmur is detected more intensively. Such detailed description for a relatively large number of heart sounds may pave the way for new machine learning algorithms with a real-world application for the detection and analysis of murmur waves for diagnostic purposes.


Subject(s)
Heart Murmurs , Heart Sounds , Algorithms , Auscultation , Child , Heart Auscultation/methods , Heart Murmurs/diagnosis , Humans
6.
Int. j. cardiovasc. sci. (Impr.) ; 34(5): 523-530, Sept.-Oct. 2021. tab, graf
Article in English | LILACS | ID: biblio-1340048

ABSTRACT

Abstract Background: Fontan circulation can be associated with significant morbidity, especially Protein-Losing Enteropathy (PLE). Echocardiographic parameters can provide valuable diagnostic information about a patient's risk of developing PLE after Fontan surgery. Objectives: To describe echocardiographic/ultrasonographic parameters associated with PLE in patients after Fontan surgery through a systematic review with meta-analysis. Methods: A literature search was performed in electronic databases to identify relevant studies about echocardiographic parameters and PLE prediction in children after Fontan surgery. The search terms used were: "echocardiography", "ultrasonography", "Fontan," and "protein-losing enteropathy". A p < 0.05 was considered statistically significant. Results: A total of 653 abstracts were obtained from electronic databases and bibliographic references. From these, six articles met criteria to be included in the qualitative analysis and three in the quantitative (meta-analysis). The resistance index in the superior mesenteric artery was described in three studies, and the quantitative analysis showed statistical significance (p < 0.001). Other echocardiographic and ultrasonographic parameters were also described, albeit in single studies not allowing a meta-analysis. Conclusion: This systematic review with meta-analysis identified echocardiographic and ultrasonographic parameters related to PLE in patients with Fontan physiology. Vascular ultrasonography seems to play a prominent role in this aspect, but additional studies are needed to increase the degree of evidence.


Subject(s)
Humans , Male , Female , Protein-Losing Enteropathies/diagnostic imaging , Fontan Procedure/methods , Echocardiography/methods , Ultrasonography/methods , Fontan Procedure/adverse effects
9.
Mol Biol Rep ; 47(11): 8545-8552, 2020 Nov.
Article in English | MEDLINE | ID: mdl-33063148

ABSTRACT

The NOS3 gene polymorphisms T-786C, G894T and VNTR 4b/a are associated with a predisposition to the development of Metabolic Syndrome (MetS). The NOS3 gene contributes to a normal pregnancy and fetal development. According to their birthweight, newborns can be classified as: small (SGA), adequate (AGA) or large (LGA) for gestational age. The SGA and LGA present a higher risk of developing disorders related to MetS, both during childhood and adulthood. Therefore, the aim of this work is to relate the incidence of G894T, T-786C and VNTR 4b/a on SGA and LGA newborns and their mothers. 204 blood samples were collected from mothers (102) and the umbilical cords of 102 newborns (SGA = 12; AGA = 47; LGA = 43). The genotyping was performed through PCR-RFLP to evaluate presence of the G894T, T-786C and VNTR 4b/a polymorphisms. A significant difference was found between the groups of newborns in the genotypic frequency of T-786C, but without Hardy-Weinberg equilibrium. The VNTR 4b/a and the G894T polymorphisms showed no significance between the groups. The haplotype analysis showed that the SGA newborns presented the higher frequency of 4aGT (9.8%) and of the 4aTT combination (25.4%), while LGA newborns presented the higher frequency of the 4bTT haplotype (23%). Only the SGA newborns and their mothers presented the 4aTC haplotype. In conclusion, the NOS3 polymorphisms do not appear to be a factor to inadequate birth weight. However, the G894T and VNTR 4b/a polymorphisms, and the haplotype 4aTC, seem to influence the occurrence of SGA.


Subject(s)
Birth Weight/genetics , Minisatellite Repeats/genetics , Nitric Oxide Synthase Type III/genetics , Polymorphism, Single Nucleotide , Adult , Alleles , Female , Gene Frequency , Genotype , Gestational Age , Haplotypes , Humans , Infant, Newborn , Male , Metabolic Syndrome/genetics , Risk Factors
10.
Oxid Med Cell Longev ; 2020: 4850697, 2020.
Article in English | MEDLINE | ID: mdl-32273944

ABSTRACT

BACKGROUND: Cardiomyopathies remain among the leading causes of death worldwide, despite all efforts and important advances in the development of cardiovascular therapeutics, demonstrating the need for new solutions. Herein, we describe the effects of the redox-active therapeutic Mn(III) meso-tetrakis(N-ethylpyridinium-2-yl)porphyrin, AEOL10113, BMX-010 (MnTE-2-PyP5+), on rat heart as an entry to new strategies to circumvent cardiomyopathies. METHODS: Wistar rats weighing 250-300 g were used in both in vitro and in vivo experiments, to analyze intracellular Ca2+ dynamics, L-type Ca2+ currents, Ca2+ spark frequency, intracellular reactive oxygen species (ROS) levels, and cardiomyocyte and cardiac contractility, in control and MnTE-2-PyP5+-treated cells, hearts, or animals. Cells and hearts were treated with 20 µM MnTE-2-PyP5+ and animals with 1 mg/kg, i.p. daily. Additionally, we performed electrocardiographic and echocardiographic analysis. RESULTS: Using isolated rat cardiomyocytes, we observed that MnTE-2-PyP5+ reduced intracellular Ca2+ transient amplitude, without altering cell contractility. Whereas MnTE-2-PyP5+ did not alter basal ROS levels, it was efficient in modulating cardiomyocyte redox state under stress conditions; MnTE-2-PyP5+ reduced Ca2+ spark frequency and increased sarcoplasmic reticulum (SR) Ca2+ load. Accordingly, analysis of isolated perfused rat hearts showed that MnTE-2-PyP5+ preserves cardiac function, increases SR Ca2+ load, and reduces arrhythmia index, indicating an antiarrhythmic effect. In vivo experiments showed that MnTE-2-PyP5+ treatment increased Ca2+ transient, preserved cardiac ejection fraction, and reduced arrhythmia index and duration. MnTE-2-PyP5+ was effective both to prevent and to treat cardiac arrhythmias. CONCLUSION: MnTE-2-PyP5+ prevents and treats cardiac arrhythmias in rats. In contrast to most antiarrhythmic drugs, MnTE-2-PyP5+ preserves cardiac contractile function, arising, thus, as a prospective therapeutic for improvement of cardiac arrhythmia treatment.


Subject(s)
Arrhythmias, Cardiac/drug therapy , Arrhythmias, Cardiac/prevention & control , Cardiovascular System/drug effects , Metalloporphyrins/therapeutic use , Oxidation-Reduction/drug effects , Animals , Male , Rats , Rats, Wistar
11.
Telemed J E Health ; 26(12): 1449-1454, 2020 12.
Article in English | MEDLINE | ID: mdl-32212988

ABSTRACT

Background: Congenital heart disease (CHD) affects 1% of all newborns and is a major public health problem. Most children with CHD benefit from early diagnosis to optimize management. However, in many places there are no specialized professionals to do so. Introduction: A screening method for CHD was developed between two states in Northeast Brazil. It was based upon the performance of an echocardiogram by local pediatricians with support of pediatric cardiologists through telemedicine. Objective: To determine if the continuous performance of examinations together with online supervision increased the level of understanding of the pediatricians about the echocardiograms. Methods: Pediatricians received online support to perform echocardiograms for 7 years (2012-2018). Although the project aimed to teach them to acquire images and send to the cardiologists for analysis and interpretation, they were encouraged to describe their own diagnostic impressions. The level of agreement between pediatricians and cardiologists was calculated. Results: A large number (n = 3,951) echocardiograms was analyzed. From them, 2,818 were classified as abnormal, inconclusive, or normal by both the pediatricians and the cardiologists. The 7-year analysis demonstrated an overall agreement of 63.7%. As for the final diagnosis, it was possible to compare 1,457 echocardiograms. The combined analysis of the 7 years demonstrated agreement in 62.2%. Discussion: The screening of CHD under online support led to more in-depth learning of echocardiography by the pediatricians. This approach potentialized the accuracy of the screening through the years. Conclusion: By enrolling in a telemedicine-based screening program, the pediatricians' degree of understanding of echocardiography increased considerably.


Subject(s)
Heart Defects, Congenital , Telemedicine , Brazil , Child , Echocardiography , Heart Defects, Congenital/diagnostic imaging , Humans , Infant, Newborn , Pediatricians
13.
Arq. bras. cardiol ; 112(6): 713-714, Jun. 2019. graf, tab
Article in English, Portuguese | Sec. Est. Saúde SP, SESSP-IDPCPROD, Sec. Est. Saúde SP | ID: biblio-1022838

ABSTRACT

O objetivo primordial desse documento é estimular a melhoria das condições de saúde das mulheres brasileiras, com foco na doença cardiovascular (DCV). A DCV é responsável por 17,5 milhões de mortes prematuras/ano no mundo, com previsão de aumento para 23 milhões em 2030. As DCV são responsáveis por um terço de todas as mortes no Brasil, com semelhança entre homens e mulheres após a menopausa. Esses dados revestem-se de maior importância quando consideramos que 80% das mortes prematura. (AU)


Subject(s)
Humans , Female , Women , Cardiovascular Diseases/mortality , Cardiovascular Diseases/epidemiology
14.
IEEE J Biomed Health Inform ; 23(1): 305-313, 2019 01.
Article in English | MEDLINE | ID: mdl-29994568

ABSTRACT

Rheumatic heart disease can result from repeated episodes of acute rheumatic fever, which damages the heart valves and reduces their functionality. Early manifestations of heart valve damage are visible in echocardiography in the form of valve thickening, shape changing and mobility reduction. The quantification of these features is important for a precise diagnosis and it is the main motivation for this work. The first step to make this quantification is to accurately identify and track the anterior mitral leaflet throughout the cardiac cycle. An accurate segmentation and tracking with minimum user interaction is still an open problem in literature due to low image quality, speckle noise, signal dropout and nonrigid deformations. In this work, we propose a novel approach for the identification of the anterior mitral valve leaflet in all frames. The method requires a single user-specified point on the posterior wall of the aorta as input, in the first frame. The echocardiography videos are converted into a new image space, the Virtual M-mode, which samples the original echocardiography image over automatically estimated scanning lines. This new image space not only provides the motion pattern of the posterior wall of the aorta, the anterior wall of the aorta and the posterior wall of the left atrium, but also provides the location of the structures in each frame. The location information is then used to initialize the localized active contours, followed by segmenting the anterior mitral leaflet. Results shown that the new image space has robustly identified the anterior mitral valve leaflet, without any failure. The median modified Hausdorff distance error of the proposed method was 2.3 mm, with a recall of 0.94.


Subject(s)
Echocardiography/methods , Image Interpretation, Computer-Assisted/methods , Mitral Valve/diagnostic imaging , Adult , Child , Female , Heart Valve Diseases/diagnostic imaging , Humans , Pregnancy
15.
Trans R Soc Trop Med Hyg ; 113(2): 65-73, 2019 02 01.
Article in English | MEDLINE | ID: mdl-30412231

ABSTRACT

Background: Repellent use during pregnancy was strongly recommended after uncovering Zika virus (ZIKV) involvement with congenital malformations. In this context, Pernambuco, Brazil played a key role since it was the epicentre for the main studies suggesting ZIKV teratogenicity and one of Brazil's most affected states during the 2014-2016 epidemics. Thus we aimed to identify possible associations between social determinants of health and repellent use in pregnancy during the ZIKV outbreak in Pernambuco. Methods: We conducted a cross-sectional study (July-December 2016) with 539 pregnant women residing in Pernambuco and estimated the associations by prevalence ratio and multivariable logistic regression. Results: Repellents were associated with pregnant women ≥30 y; graduates, employed, health professionals, private health system users and with a monthly income per person greater than two minimum wages. Women whose domiciles favour mosquitoes (ground-floor houses, intermittent water supply from general distribution or water trucks and for ≤6 d/week, cesspools/open wastewater, indoor household water storage) were less likely to use repellents. There was no association for peridomiciles. Conclusions: Repellents were not associated with ZIKV in most vulnerable pregnant women, despite all the general recommendations made during the Pernambuco epidemic. This study observed a demand for public policies focused on health, education and sanitation problems related to deprived social groups along with their co-responsibility rather than focusing on individual attitudes against mosquitoes.


Subject(s)
Insect Repellents/administration & dosage , Pregnant Women/psychology , Zika Virus Infection/epidemiology , Zika Virus Infection/prevention & control , Administration, Topical , Adult , Age Factors , Brazil/epidemiology , Cross-Sectional Studies , Female , Humans , Pregnancy , Prevalence , Social Determinants of Health , Socioeconomic Factors
16.
Rev. bras. educ. méd ; 42(4): 103-108, out.-dez. 2018. graf
Article in Portuguese | LILACS | ID: biblio-977549

ABSTRACT

RESUMO INTRODUÇÃO A anatomia e a fisiologia do coração humano há muito tempo despertam curiosidade, dada a complexidade da morfologia cardíaca, a sua importância para a manutenção da vida e seu grande valor simbólico. O entendimento da fisiologia cardíaca e sua representação nas diversas modalidades artísticas têm ajudado até hoje na formação de profissionais de saúde que trabalham com cardiologia e também na comunicação com familiares. Este artigo apresenta a experiência de um especializando em um serviço de referência no ensino de cardiologia pediátrica, na construção de modelos de corações normais e patológicos em massa de modelar e massa de biscuit, e as implicações no processo de ensino-aprendizagem do grupo de preceptores e residentes da instituição. RELATO DE EXPERIÊNCIA Um residente do primeiro ano de cardiologia pediátrica, sem treinamento ou experiência prévia com artes plásticas, foi estimulado pela preceptoria do programa a moldar corações normais e com cardiopatias congênitas para fins de aprendizado da anatomia interna e externa do órgão. Os materiais utilizados foram massa de modelar e massa de biscuit. RESULTADOS Dez peças foram produzidas ao longo de um ano de especialização, com melhora progressiva nos aspectos artísticos e anatômicos. Entre os modelos patológicos, foram produzidas peças representativas de tetralogia de Fallot, transposição dos grandes vasos, persistência do canal arterial e comunicação interventricular. CONCLUSÃO A experiência proporcionou três efeitos positivos constatados pela equipe: maior entendimento da anatomia cardíaca normal e patológica por parte do especializando envolvido, o qual se refletiu, por exemplo, em melhor compreensão de imagens médicas, como ecocardiografia, tomografia computadorizada e ressonância magnética cardíacas, maior aproximação dos residentes do programa com as artes plásticas em uma especialidade que sempre teve uma relação muito estreita com o desenho e a escultura, e produção de modelos em três dimensões de estruturas normais e patológicas que podem ser usadas em aulas e encontros científicos para discussão da disciplina.


ABSTRACT INTRODUCTION The anatomy and physiology of the human heart has long captivated the curiosity of human beings, due to its complexity, its importance for maintaining life, and its great symbolic value. The understanding of cardiac physiology and its representations in different art forms has assisted in the training of health professionals, particularly those working in cardiology, as well as communication with families.This article presents the experience of a pediatric cardiology resident using modeling clays to build normal and abnormal heart models, and discusses the implications of this practice in the teaching-learning process among staff and trainees of the institution. CASE REPORT A first year paediatric cardiology resident, with no previous training or experience in the plastic arts, was encouraged by Head of Department to mould hearts with normal anatomy and with congenital heart disease for the purpose of teaching the internal and external anatomy of the organ. The materials used were plasticine and cold porcelain clay. RESULTS Ten anatomical pieces were produced over a one-year period, with progressive improvements in artistic and anatomical aspects. Among the pathological models, there were pieces demonstrating the tetralogy of Fallot, transposition of the great vessels, patent ductus arteriosus, and ventricular septal defect. CONCLUSION The experience lead to three positive effects noted by the medical team: a better understanding of normal and abnormal cardiac anatomy by the residents, evidenced by their rapid improvement in interpreting medical images such as echocardiography, computerized tomography and nuclear magnetic resonance images; greater access of residents to the plastic arts, in a medical specialty that has always benefited from close proximity with drawings and sculpture; and the production of very low-cost 3D models of normal and abnormal cardiac anatomy that can be used for lectures, clinical-surgical and scientific meetings, and teaching future students.

17.
Annu Int Conf IEEE Eng Med Biol Soc ; 2018: 3120-3123, 2018 Jul.
Article in English | MEDLINE | ID: mdl-30441055

ABSTRACT

Rheumatic heart disease is responsible for the heart valve damage, caused by repeated episodes of rheumatic fever. The disease commonly inflames and scars the mitral valve of the heart, resulting in thicker, less mobile leaflets, with associated decrease in cardiac efficiency. It is important to measure and quantity the early manifestations of this disease, including variations of the thickness, shape and mobility of the leaflets. These manifestations are visible in an echocardiographic screening process. The first step towards the defined objective is to segment the anterior mitral leaflet throughout the cardiac cycle, enabling the future automatic quantification of mentioned clinical parameters. In this work, a new algorithm for the segmentation of the whole region of the anterior mitral leaflet in the virtual M-mode space is proposed. The algorithm requires a single initialization point on the posterior wall of the aorta, in the first frame of the video. A junction point is then computed, showing the location where the two leaflets connect. This junction point helps to automatically redefine the range of virtual M-mode images required to completely segment the region of the anterior mitral leaflet. The segmented anterior mitral leaflet region in the virtual M-mode space is transferred back to regular image space and its shape refined using localized active contours. Results suggest the suitability of the proposed algorithm for the segmentation of anterior mitral leaflet with a median Dice Similarity Coefficient of 0.63, and with median precision and recall of 58% and 73% respectively.


Subject(s)
Mitral Valve Insufficiency , Mitral Valve Prolapse , Algorithms , Echocardiography , Humans , Mitral Valve
18.
Annu Int Conf IEEE Eng Med Biol Soc ; 2018: 3582-3585, 2018 Jul.
Article in English | MEDLINE | ID: mdl-30441152

ABSTRACT

Rheumatic heart disease is the serious consequence of repeated episodes of acute rheumatic fever. It is the major cause of heart valve damage resulting in morbidity and mortality. Its early detection is considered vital to control the disease's progression. The key manifestations that are visible in the early stages of this disease are changes in the thickness, shape and mobility of the mitral valve leaflets. Echocardiography based screening is sensitive enough to identify these changes in early stages of the disease. In this work, an automatic approach is proposed to measure, quantify and analyze the thickness of the anterior mitral leaflet, in an echocardiographic video. The shape of the anterior mitral leaflet is simplified via morphological skeletonization and spline modelling to get the central line of the leaflet. To analyze the overall thickness from the tip to its base, the anterior mitral leaflet is divided into four quartiles. In ach quartile the thickness is measured as the length of the line segment resulting from the intersection of the contour with the normal direction of the central point of each quartile. Finally, the thickness is analyzed by measuring the variance per quartile, divided by leaflet position (open, straight and closed). The comparison between the normal and pathological leaflets are also presented, exhibiting statistical significant differences in all quartiles, especially near the tip of the leaflet.


Subject(s)
Lymphatic Vessels , Echocardiography , Humans , Mitral Valve , Mitral Valve Insufficiency
20.
Am J Hypertens ; 31(9): 1059-1065, 2018 08 03.
Article in English | MEDLINE | ID: mdl-29452343

ABSTRACT

Background: High blood pressure (BP) is usually underdiagnosed in children and adolescents, particularly due to its complex diagnosis process. This study describes novel height-based equations for the detection of BP disorders (BP > 90th percentile) and compares the accuracy of this approach with previously described screening methods to identify BP disorders. Methods: Height-based equations were built using the 90th percentile values for systolic and diastolic BP and respective height values from the current guideline of high-BP management in children. This guideline was also used as the gold standard method for identification of BP disorders. The equations were tested in Brazilian (n = 2,936) and American (n = 6,541) populations of children with 8-13 years old. Results: The obtained equations were 70 + 0.3 × height (in cm) for systolic BP and 35 + 0.25 × height (in cm) for diastolic BP. The new equations presented sensitivity and negative predictive value of near 100% and specificity > 91% and showed higher specificity and positive predictive value when compared with other screening tools. Importantly, height-based equations had greater agreement (kappa coefficient = 0.75-0.81) with the gold standard method than the other methods (kappa coefficient = 0.53-0.73). Further analysis showed that alternative height-based equations designed to identify hypertension (BP ≥ 95th percentile) also showed superior performance (kappa coefficient = 0.89-0.92) compared with other screening methods (kappa coefficient = 0.43-0.85). Conclusions: These findings suggest that the use of height-based equations may be a simple and feasible approach to improve the detection of high BP in the pediatric population.


Subject(s)
Blood Pressure , Body Height , Hypertension/diagnosis , Models, Biological , Adolescent , Age Factors , Brazil , Child , Female , Humans , Hypertension/physiopathology , Male , Nutrition Surveys , Predictive Value of Tests , Reproducibility of Results , Retrospective Studies , United States
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