Evaluación del Compromiso Cardiovascular en niños en diálisis mediante el Índice de Masa Ventricular Izquierdo / Left Ventricular Mass Index and Cardiovascular Compromise in children on dialysis

INTRODUCCIÓN: Existe una estrecha relación entre enfermedad renal crónica (ERC) y enfermedad cardiovascular. Una de sus manifestaciones clínicas es la hipertrofia de ventrículo izquierdo (HVI), expresada como Indice de Masa Ventricular Izquierda (IMVI, gr/m27). En pacientes portadores de ERC con retraso de creci miento, el cálculo de IMVI debería ajustarse corrigiendo la edad para la talla. OBJETIVO: Comparar el IMVI corregido por edad para la talla, con el valor calculado por edad cronológica en niños con ERC en diálisis. PACIENTES Y MÉTODO: Estudio de corte transversal. Se analizan ecocardiografías de pacientes portadores de ERC en diálisis entre 1-18 años, enero de 2016 a julio 2017. Se evalúa IMVI ajustando el valor expresado a gr/m27 al percentil para la edad cronológica del niño, y luego se ajusta el valor a la edad corregida por la talla. Se usa estadística descriptiva y estudio de concordancia para las evaluacio nes de IMVI calculado por edad cronológica y para edad corregida por talla. RESULTADOS: Se incluyeron 26 pacientes, 75 ecocardiogramas. Un 56% presentó HVI usando IMVI calculado por edad cronoló gica vs un 46,6% al corregir la edad para la talla. Al comparar los grupos de percentiles de IMVI-edad cronológica vs IMVI ajustado a la edad para la talla real, se observó que el 18,6% de la muestra cambia de grupo de percentil, el 100% de ellos a un grupo de percentil inferior. La concordancia evaluada en base a coeficiente Kappa fue de 0,72 (concordancia perfecta > 0,8), confirmando diferencias al ajustar el IMVI para la edad corregida por la talla. CONCLUSIÓN: El cálculo de IMVI por edad cronológica so breestima el compromiso cardiovascular en niños con ERC que característicamente tienen un retraso de talla. Los resultados sugieren que el cálculo de IMVI ajustado a la edad corregida por talla otorga mayor precisión al diagnóstico de hipertrofia ventricular izquierda en este grupo de pacientes.

INTRODUCTION: There is a close relationship between chronic kidney disease (CKD) and cardiovascular disease. One of its clinical manifestations is left ventricular hypertrophy (LVH), expressed as Left Ventricular Mass Index (LVMI gr/m27). In CKD patients with growth retardation, the LVMI calculation should be adjusted by correcting age for length/height. OBJECTIVE: To compare the age-corrected LVMI for length/height with the value calculated by chronological age in CKD children on dialysis. PATIENTS AND METHOD: Cross-sectional study. We analyzed echocardiographies of CKD children on dialysis aged between 1 and 18, from January 2016 to July 2017. LVMI was evaluated by adjusting the value expressed in gr/m27 to the percentile for the chronological child's age, and then the value was adjusted to the age-corrected length/height. We used descriptive statistics and concordance study for LVMI assessments calculating by chronological age and for age-corrected length/height. RESULTS: 26 patients were included and 75 echocardiograms. 56% had left ventricular hypertrophy using chronological age versus 46.6% age-corrected LVMI for length/height. When comparing the percentile groups of LVMI-chronological age vs. age-adjusted LVMI for actual length/height, it was observed that 18.6% of the sample changed percentile groups, 100% of them to a lower percentile group. The agreement evaluated based on the Kappa coefficient was 0.72 (perfect agreement > 0.8), confirming differences when adjusting the LVMI for age-corrected length/height. CONCLUSION: Calculating LVMI by chro nological age overestimates the cardiovascular involvement in children with CKD who are charac teristically stunted. The results suggest that the age-adjusted, length/height-corrected calculation of LVMI gives greater accuracy to the diagnosis of left ventricular hypertrophy in this group of patients.

Compromiso cardiovascular en pacientes pediátricos en diálisis peritoneal crónica / Cardiovascular disease in pediatric patients under chronic peritoneal dialysis

La diálisis peritoneal (DP) es la terapia de reemplazo renal más usada en niños portadores de enfermedad renal crónica terminal. La enfermedad cardiovascular es la principal causa de mortalidad en estos pacientes. OBJETIVO: Caracterizar pacientes pediátricos en DP crónica desde el punto de vista cardiovascular. PACIENTES Y MÉTODO: Estudio de corte transversal en pacientes en DP, estables según criterios DOQI. Se registraron variables epidemiológicas, dialíticas, bioquímicas y cardiovasculares. Se evaluó hipertrofia ventricular izquierda (HVI) por ecocardiografía. El índice de masa ventricular izquierda (IMVI) se calculó por índice talla/edad (g/m2.7). Se consideró HVI > 38,6 g/m2.7, y severa HVI > 51 g/m2.7. Se analizaron las variables continuas mediante ANOVA, y categóricas por χ2 o método exacto de Fisher. Se analizaron los datos en STATA 11.0. RESULTADOS: Se incluyeron 21 pacientes, 11 varones, edad 9,2 ± 3,5 años. El diagnóstico más frecuente fue displasia renal (52%). El KtV residual promedio fue de 0,8, y peritoneal 1,9. En la ecocardiografía, un 52% presentó HVI, un 91% de ellos en rango severo. Se demostró una relación significativa entre ultrafiltración y presión arterial sistólica, y entre IMVI y hemoglobina (p < 0,05). CONCLUSIONES: En este estudio reportamos una incidencia de HVI mayor al 50%, en su mayoría grado severo, lo cual evidencia el importante compromiso cardiovascular en estos pacientes. La hipertensión arterial y falla de ultrafiltración destacan como importantes factores relacionados a la hipertrofia ventricular izquierda.

Peritoneal dialysis (PD) is the most common renal replacement therapy used in pediatric patients with end stage renal disease. This population has a mortality rate 1,000 times greater compare to pediatric population, mainly due to cardiovascular causes. OBJECTIVE: To characterize pediatric patients on chronic PD in relation to dialysis and cardiovascular outcome. PATIENTS AND METHODS: Cross sectional study. Patients in stable PD according to DOQI criteria were selected. Epidemiological, dialytic, biochemical and cardiovascular variables were registered. Left Ventricular Mass Index (LVMI) was calculated by height/age (g/m2.7). Left Ventricular Hypertrophy (LVH) was diagnosed with > 38.6 g/m2.7, severe LVH > 51 g/m2.7. Data were analyzed using STATA 11.0. continuous variables using ANOVA test and categorical variables were analyzed using χ2 test or Fisher's exact test. RESULTS: 21 patients, 11 males. Mean age 9.2 ± 3.52 years. The most frequent diagnosis was renal dysplasia (52%). Residual and Peritoneal KtV were 0.8 and 1.9 respectively. Fifty-two percent of patients showed LVH, 91% in severe range. A significant relationship between ultrafiltration/m2 and systolic blood pressure was depicted. Also a significant relationship between left ventricular mass index and hemoglobin (p < 0.05) was founded. CONCLUSIONS: The majority of the population showed left ventricular hypertrophy -particularly severe LVH-, which confirms an increased CV risk in this population. Blood pressure and loss of ultrafiltration were founded to be correlated to LVH.

Comportamento do índice de massa do ventrículo esquerdo de pacientes em diálise no decorrer de 17 anos / Left ventricular mass behaviour in hemodialysis patients during 17 years

ResumoIntrodução:A hipertrofia ventricular esquerda (HVE) é alteração frequente em pacientes de diálise e imprime prognóstico sombrio. Não se conhece qual a tendência secular dessa alteração cardíaca em nossos pacientes.Objetivo:Avaliar o comportamento da HVE, pelo índice de massa do ventrículo esquerdo (IMVE), no decorrer de 17 anos em pacientes de um centro universitário de diálise, bem como verificar as possíveis causas desse comportamento.Métodos:Foi realizado um estudo longitudinal retrospectivo que avaliou, por meio de ecocardiografia, o IMVE em pacientes submetidos à hemodiálise em nosso Serviço de Diálise durante o período de 17 anos, de 1993 a 2010. Foram incluídos 250 exames de pacientes com doença renal crônica estágio V-D com idade superior a 18 anos que foram submetidos à avaliação ecocardiográfica de rotina.Resultados:Notou-se redução do IMVE à medida que os anos avançavam. Essa redução correlacionou-se à diminuição da pressão arterial e à elevação da hemoglobina. Em análise múltipla, a massa ventricular esquerda associou-se apenas à pressão arterial.Conclusão:A porcentagem de pacientes com HVE sofreu redução significante no decorrer de 17 anos em nossa Unidade de Diálise. O fator associado a essa redução foi a diminuição da pressão arterial.

AbstractIntroduction:Ventricular hypertrophy is frequent in dialysis patients and is associated with an ominous prognosis. It is not knowledge if this ventricular change is growing or decreasing in hemodialysis patients.Objective:To assess left ventricular hypertrophy behaviour during 17 years in patients of a university dialysis center, as well as to verify the possible causes of this behavior.Methods:There was performed a retrospective longitudinal study that evaluated the echocardiographic left ventricular mass in hemodialysis patients in our dialysis facility over 17 years. Examinations of 250 patients aged 18 years or more who underwent routine echocardiography were included.Results:There was a progressive reduction of ventricular mass over studied period. This reduction was associated with blood pressure reduction. In multivariate analysis, ventricular mass was associated with blood pressure and hemoglobin.Conclusion:Left ventricular hypertrophy underwent significant reduction over 17 years in our hemodialysis patients. The factors associated with this reduction that could be identified in the current study were the progressive reduction of blood pressure and hemoglobin increase.

Screening for Fabry Disease in Left Ventricular Hypertrophy: Documentation of a Novel Mutation / Rastreio de Doença de Fabry na Hipertrofia Ventricular Esquerda: Documentação de uma Nova Mutação

AbstractBackground:Fabry disease is a lysosomal storage disease caused by enzyme α-galactosidase A deficiency as a result of mutations in the GLA gene. Cardiac involvement is characterized by progressive left ventricular hypertrophy.Objective:To estimate the prevalence of Fabry disease in a population with left ventricular hypertrophy.Methods:The patients were assessed for the presence of left ventricular hypertrophy defined as a left ventricular mass index ≥ 96 g/m2 for women or ≥ 116 g/m2 for men. Severe aortic stenosis and arterial hypertension with mild left ventricular hypertrophy were exclusion criteria. All patients included were assessed for enzyme α-galactosidase A activity using dry spot testing. Genetic study was performed whenever the enzyme activity was decreased.Results:A total of 47 patients with a mean left ventricular mass index of 141.1 g/m2 (± 28.5; 99.2 to 228.5 g/m2] were included. Most of the patients were females (51.1%). Nine (19.1%) showed decreased α-galactosidase A activity, but only one positive genetic test − [GLA] c.785G>T; p.W262L (exon 5), a mutation not previously described in the literature. This clinical investigation was able to establish the association between the mutation and the clinical presentation.Conclusion:In a population of patients with left ventricular hypertrophy, we documented a Fabry disease prevalence of 2.1%. This novel case was defined in the sequence of a mutation of unknown meaning in the GLA gene with further pathogenicity study. Thus, this study permitted the definition of a novel causal mutation for Fabry disease - [GLA] c.785G>T; p.W262L (exon 5).

ResumoFundamento:A doença de Fabry é uma doença lisossomal de sobrecarga provocada pela deficiência da enzima α-galactosidase A como resultado de mutações no gene GLA. O envolvimento cardíaco carateriza-se por hipertrofia ventricular esquerda progressiva.Objetivo:Estimar a prevalência da doença de Fabry numa população com hipertrofia ventricular esquerda.Métodos:Os doentes foram avaliados para a presença de hipertrofia ventricular esquerda definida por massa do ventrículo esquerdo indexada como ≥ 96 g/m2 para mulheres ou ≥ 116 g/m2 para homens. Estenose aórtica severa e hipertensão arterial, com hipertrofia ventricular esquerda discreta, foram critério de exclusão. Todos os doentes incluídos foram avaliados para a atividade da enzima α-galactosidase A com testes de gota seca. No caso de atividade enzimática diminuída, realizava-se estudo genético.Resultados:Foram incluídos 47 doentes com uma média de massa indexada de 141,1 g/m2 (± 28,5; 99,2 a 228,5 g/m2]. A maioria (51,1%) dos doentes era do sexo feminino. Nove deles (19,1%) tinham diminuição da atividade da α-galactosidase A, mas apenas um teste genético foi positivo − [GLA] c.785G>T; p.W262L (éxon 5), uma mutação não descrita na literatura. O trabalho de investigação clínica permitiu estabelecer uma associação entre a mutação e a apresentação clínica.Conclusão:Em uma população de doentes com hipertrofia ventricular esquerda, documentamos uma prevalência de doença de Fabry de 2,1%. O novo caso foi definido na sequência de uma mutação de significado indeterminado no gene GLA com posterior estudo de patogenicidade. Este estudo permitiu, assim, definir uma nova mutação causal para doença de Fabry - [GLA] c.785G>T; p.W262L (éxon 5).

Genetic variations of b-MYH7 in Venezuelan patients with hypertrophic cardiomyopathy / Variaciones genéticas en el gen MYH7 en pacientes venezolanos con miocardiopatía hipertrófica

Hypertrophic cardiomyopathy (HCM) is a cardiac disease, characterized by marked hypertrophy and genetic variability. HCM has been associated with sarcomere protein mutations, being cardiac b-myosin (coded by the MYH7 gene) and myosin binding protein C (coded by the MYBPC3 gene) the most frequently affected proteins. As in Venezuela only the clinical analysis are performed in HCM patients, we decided to search for genetic variations in the MYH7 gene. Coding regions, including the junction exon-intron of the MYH7 gene, were studied in 58 HCM patients, whose samples were collected at the ASCARDIO Hospital (Barquisimeto, Lara state, Venezuela) and 106 control subjects from the ASCARDIO Hospital and the IVIC (Barquisimeto Lara state and Miranda, Venezuela, respectively). The blood samples were analyzed by genomic DNA isolation, followed by polymerase chain reaction and sequence analysis. The screening of the MYH7 gene revealed eight already reported polymorphic variants, as well as two intronic variations in these HCM patients. Neither any missense mutations nor other pathological mutations in the MYH7 gene were found in the HCM patients.

La miocardiopatía hipertrófica (MH) es una enfermedad cardiaca primaria, caracterizada por una marcada hipertrofia y variabilidad genética. MH ha sido asociada con mutaciones en las proteínas del sarcómero, siendo la beta miosina cardiaca, codificada por el gen MYH7 y la proteína de unión a miosina C, codificada por el gen MYBPC3, las principalmente afectadas. En Venezuela únicamente se realiza el diagnóstico clínico de MH, por lo cual el objetivo principal de este trabajo fue realizar el análisis genético en los pacientes, iniciando con el gen MYH7. Para ello, se estudió la región codificante, incluyendo la región de unión exón-intron del gen MYH7 en 58 pacientes provenientes de ASCARDIO (Barquisimeto, estado Lara) y 106 controles provenientes de ASCARDIO e IVIC (estados Lara y Miranda, Venezuela). Se colectaron las muestras de sangre para el aislamiento del ADN genómico, se realizó la técnica de PCR, seguido del análisis de secuencias para la detección de mutaciones en pacientes y controles. Se encontraron 8 polimorfismos previamente reportados, y 2 variaciones intrónicas. No se encontraron mutaciones que involucraran un cambio de aminoácido en ninguno de los exones del gen MYH7 de la beta miosina cardiaca.

Prevalencia de hipertrofia ventricular izquierda en pacientes diabéticos / Prevalence of left ventricular hypertrophy in diabetic patients

Con el objetivo de establecer la prevalencia de hipertrofia ventricular izquierda (HVI) en pacientes con diabetes mellitus tipo 2 (DM), se realizó un estudio transversal en estos pacientes, estableciendo sus características antropométricas, presión arterial y control metabólico. Para evaluar la presencia de HVI se empleó ecocardiografía transtorácica. El estudio incluyó 91 pacientes, en los cuales la prevalencia de HVI fue de 63,7%, siendo más frecuente en mujeres que en varones (p=0,001). Adicionalmente, se encontró un 46,2% de pacientes con disfunción diastólica del ventrículo izquierdo. Se concluye que existe una importante prevalencia de HVI en pacientes diabéticos sin antecedentes de causas definidas de hipertrofia. No se encontró relación con sexo, control metabólico, IMC y tiempo de diagnóstico.

In order to establish the prevalence of left ventricular hypertrophy (LVH) in patients with type 2 diabetes mellitus, (DM) a cross-sectional study was conducted in these patients studying their anthropometric characteristics, blood pressure and metabolic control. To evaluate the presence of LVH, a trans-thoracic echocardiogram was used. The study included 91 patients, finding a 63.7% prevalence of HVI, with women being more affected than men (p=0.001). Additionally, 46.2% of patients were found to have diastolic dysfunction of the left ventricle. We conclude that there is an important prevalence of LVH in diabetic patients without defined causes of hypertrophy. There was no association with sex, metabolic control, BMI and time of diagnosis.

Frecuencia y factores de riesgo de la hipertrofia ventricular izquierda como marcador de daño cardiovascular en el trasplante renal / Frequency and risk factors of the left ventricular hypertrophy like scoreboard of cardiovascular damage in renal transplant

Introducción: las complicaciones cardiovasculares son frecuentes y constituyen la principal causa de muerte en los pacientes con trasplantes renales, su alta incidencia está dada por múltiples factores de riesgo. Objetivos: determinar la frecuencia de la hipertrofia del ventrículo izquierdo como marcador de daño cardiovascular, y los factores de riesgo que facilitarían su aparición. Métodos: se hizo un estudio prospectivo, de corte transversal y de tipo casos y controles, a 70 enfermos con trasplantes renales a los cuales se les realizó un ecocardiograma convencional para determinar la presencia o no de hipertrofia del ventrículo izquierdo y se relacionó, mediante un estudio univariado y multivariado (regresión logística), con factores de riesgo cardiovascular. Resultados: las afecciones cardiovasculares constituyeron la segunda causa de pérdida de los pacientes en este estudio (33,1 porciento), La hipertrofia del ventrículo izquierdo se encontró en 45 (64 porciento) de los enfermos pesquisados. La dislipemia, el uso de la ciclosporina A y la disfunción del injerto, fueron las complicaciones que constituyeron, tanto en el estudio univariado como multivariado (factor independiente), p < 0,05, condicionales que favorecieron la existencia de hipertrofia del ventrículo izquierdo, aseveraciones estas que constituyen las conclusiones de la investigación...

Introduction: the cardiovascular complications are frequent and are the leading cause of death in patients underwent renal transplantation and its high incidence is due to multiple risk factors. Objectives: to determine the frequency of the left ventricle hypertrophy as a marker of cardiovascular damage and the risk factors leading to its appearance. Methods: a case-control, cross-sectional and prospective study was conducted in 70 patients with renal transplantations and underwent a conventional echocardiogram to determine the presence or not of left ventricle hypertrophy and it was related to cardiovascular risk factors by means of a univariate and multivariate study (logistic regression) with cardiovascular risk factors. Results: the cardiovascular affections were the second cause of loss of patients in present study (33,1 porciento). The left ventricle hypertrophy was found in the 45 (64 porceinto) of screened patients. The dyslipidemia, the use of A cyclosporine and the graft dysfunction, were the complications in the univariate and the multivariate study (independent factor) , p < 0,05, the conditional favoring the existence of left ventricle hypertrophy, assertions that are the research conclusions...

Carotid intima media thickness, left ventricular hypertrophy and weekly averaged blood pressure in hemodialysis patients

Undoubtedly, cardiovascular complications are the leading cause of mortality and morbidity in haemodialysis [HD] patients, and hypertension plays an important role in development of cardiovascular disorders in them. The present study evaluated the weekly averaged blood pressure with its relation to carotid intima media thickness and left ventricular mass index in HD patients. The study included 112 HD patients [85 males and 27 females]. We used daily home blood pressure [HBP] monitoring to record a total of 20 points of BP over a period of 1 week, including measurements of the wake-up and night BPs; in addition to the BP recorded before and after each HD session that occurred three times a week. The average of 20 BP measurements was defined as the weekly averaged blood pressure [WAB]. Also, the relationship between WAB and left ventricular hypertrophy [LVH] or carotid intima media thickness and carotid intima media thickness and left ventricular hypertrophy were evaluated. The results showed that systolic WAB [144.26 +/- 7.39 mmHg] and diastolic WAB [75.84 +/- 5.15 mmHg] were almost consistent with the wake-up BP on the day after the midweek dialysis session [R2=0.628 and 0.684, respectively]. The WAB showed significant positive correlations with the left ventricular mass index [LVMI] [R=0.387, P<0.0003] and carotid intima media thickness [R=0.226, P<0.0034], whereas the predialysis systolic BP showed a significant positive correlation with the CIMT and non-significant correlation with LVMI. There was a significant positive correlation between CIMT and LVMI

Population-specific left ventricular hypertrophy in three groups from the northeastern region of India.

Background. People living in the hills are continuously exposed to strenuous physical activity for their day-to-day work. Besides hypertension, left ventricular hypertrophy in different populations may be related to continuous physical activity. Methods. Electrocardiogram, blood pressure and sociodemographic information of 12 252 subjects >30 years of age from three different population groups living in Mizoram (hilly) and Assam (plain) were recorded. Of them, 8058 were from Mizoram and 3180 and 1014 were indigenous Assamese and tea garden workers of Assam. Results. Among the subjects from Mizoram the percentage of smokers (41.9%), mean (SD) BMI (21.9 [3.8]) and waist– hip ratio (0.87 [0.02]) were significantly higher than in those from other groups. Tea garden workers had a higher mean systolic blood pressure (145.2 [25.7]) and diastolic blood pressure (87.6 [13.6]). The prevalence of left ventricular hypertrophy was highest among tea garden workers (16.5%) followed by people from Mizoram (3.7%) and the indigenous Assamese (2%) people. In spite of a significantly higher prevalence of hypertension among the indigenous Assamese community than among those from Mizoram, left ventricular hypertrophy was found to be lower in the former. Conclusion. High prevalence of left ventricular hypertrophy among tea garden workers was possibly related to a higher prevalence of hypertension but the higher prevalence of left ventricular hypertrophy among people from Mizoram might be related to more physical activity.

Prevalencia del intervalo QT prolongado en diferentes patrones electrocardiográficos: estudio por teleelectrocardiografía / Increased Q-T interval in different electrocardiographic patterns: a remote recording electrocardiographic study

Introducción: El intervalo QT prolongado ha sido identificado como factor de riesgo de arritmias ventriculares incluso en personas aparentemente sanas. El objetivo de este estudio fue establecer la prevalencia de QTc prolongado en electrocardiogramas normales, con bloqueo completo de rama (BCR) y con crecimiento de ventrículo izquierdo (HVI). Métodos y Resultados: Se consideró como prolongado un valor > 440 mseg, en cada una de 4 derivaciones: D1, aVL, V5 y V6, consensuado por dos observadores. El grupo 1 estuvo formado por 8.459 trazados normales: de ellos un 84 por ciento tenían un QTc normal y un 16 por ciento tenían un QTc prolongado. El grupo 2 consistió en 2.647 trazados con bloqueo completo de rama, 532 trazados con bloqueo completo de rama izquierda (BCRI) y 2.115 con bloqueo completo de rama derecha (BCRD). De los BCRI un 51,5 por ciento de los trazados tenían QTc prolongado, lo cual observamos sólo en un 25 por ciento de los trazados con BCRD. El grupo 3 estuvo conformado por 2.503 trazados con HVI, 377 por criterio de voltaje (grupo 3a), 1.083 por criterio de voltaje y alteración de repolarización (grupo 3b) y 1.043 HVI sólo por criterio de alteración de repolarización (grupo 3c). Un 28 por ciento de las HVI por criterio de voltaje (grupo 3a) y un 29 por ciento de HVI por alteración de repolarización (grupo 3c) tenían un QTc prolongado. De las HVI por voltaje y alteración de repolarización (grupo 3b) un 42 por ciento tenían QTc prolongado. De las HVI con QTc largo, un 7.6 por ciento tenían QTc > 500 mseg. Al desglosar las HVI por grupos el grupo 3a tenía 4,7 por ciento de los trazados con QTc largo > 500 mseg, el grupo 3b un 7,9 por ciento y el grupo 3c, un 8.3 por ciento. Conclusiones: Se concluye la alta prevalencia de QTc prolongado incluso en ECG con morfología normal, pero especialmente en BCRI y en HVI por voltaje más alteraciones de repolarización. La prolongación de QTc en BCR no mostró correlación con la ...

Background. Increased Q-T interval has been identified as a risk factor for ventricular arrhythmia including normal subjects. Aim. To establish the prevalence of an increased QTc in normal electrocardiograms (N) an in those with complete bundle branch block (RBBB or LBBB) or left ventricular hypertrophy (L VH). Method. D1, aVL, V5 and V6 leads were analyzed; a > 440ms QTC agreed upon by 2 observers was considered prolonged. Results: an increased QTc was observed in 16 percent> of 8459 N subjects, 51.5 percent> of subjects with LBBB and 25 percent of those with RBBB. Among subjects with LVH, 28 percent of those with voltage only criteria for LVH and 29 percent of those with ST-T changes but no voltage criteria had increased QTc. In contrast, 42 percent> of patients with LVH exhibiting both diagnostic criteria had increased QTc. In 7.6 percent> of LVH subjects with increased QTc, this interval was >500ms, which broke down as follows: LVH by voltage criteria alone 4.7 percent>, ST-T changes alone 7.9 percent > and LVH with both voltage and ST-T criteria 8.3 percent>. In patients with complete bundle branch block, the duration of the QRS interval was not related to QTc. Conclusion. A prolonged QTc is a frequent finding in normal ECGs, much more so in subjects with LVH associated to voltage and ST-T criteria. The prognostic impact of a prolonged QTc in patients with complete bundle branch block deserves further study.

Clinical determinants of increased left ventricular mass on echocardiogram in medically treated Afro-Caribbean hypertensive patients / Determinantes clínicas del aumento de la masa ventricular izquierda en los ecocardiogramas de pacientes hipertensos afro-caribeños bajo tratamiento médico

Increased left ventricular mass (LVM) on echocardiogram is an independent risk factor for cardiac complications from hypertension. It is associated with a four-fold increase in untoward cardiac events when present. Data were reviewed for 100 treated hypertensive Afro-Caribbean patients, aged 29 to 65 years, recruited from village health clinics. Age, gender, height, weight, systolic and diastolic blood pressure, echocardiogram (ECHO) and drug history were recorded for each patient. The best single predictor of increased LVM was blood pressure with systolic (163 vs 152 mmHg, p < 0.01) and diastolic blood pressure (105 vs 98, p < 0.01) being significantly higher in patients with increased LVM. Systolic blood pressure over 150 mmHg was associated with increased LVM in 64% vs 44% below 150 mmHg (p < 0.10). Diastolic blood pressure over 95 mmHg was associated with increased LVM in 63% vs 36% below 95 mmHg (p < 0.02). BMI showed a trend (31.1 vs 29.7 kg/m², p < 0.20) toward higher values in patients with increased LVM. BMI above 28 kg/m² was associated with increased LVM in 61% vs 44% below that value (p < 0.15). Females more than males had increased LVM (61% vs 44%, p = 0.30) possibly due to higher BMI (31 vs 29.4 kg/m²) and higher systolic blood pressure (160 vs 155 mmHg). Age (48.3 vs 46.5 years, p = 0.30) and years of hypertension (8.6 vs 7.3 years, p = 0.33) were not significantly different between the two groups. Drug treatment was reported in 90% (69% mono-therapy, 27% > one drug, 4% > 2 drugs) and no drug was associated with significant difference in LVM compared to others. Only 15% of treated hypertensive patients had systolic blood pressure below 140 mmHg and 8% had diastolic blood pressure below 90 mmHg. The major determinant of increased LVM in this group of Afro-Caribbean hypertensive patients appears to be poorly controlled hypertension with obesity being a possible contributing factor.

El aumento de la masa ventricular izquierda (MVI) en los ecocardiogramas es un factor de riesgo independiente en las complicaciones cardíacas de la hipertensión. Se haya asociado con el aumento cuádruple en eventos cardíacos adversos cuando está presente. Se revisaron datos de 100 pacientes afro-caribeños hipertensos, de 29 a 65 años de edad, reclutados de clínicas de salud de diferentes pueblos. Para cada paciente, se registró la edad, el género, la altura, el peso, la presión sanguínea sistólica y diastólica, los ecocardiogramas (ECHO), y la historia de los medicamentos. El mejor predictor simple del aumento de la MVI fue la presión sanguínea, siendo la presión sanguínea sistólica (163 versus 152 mmHg, p < 0.01) y la diastólica (105 versus 98, p < 0.01) significativamente más alta en los pacientes con MVI aumentada. La presión sanguínea sistólica por encima de los 250 mmHg estuvo asociada con el aumento de la MVI en 64% versus 44% por debajo de los 150 mmHg (p < 0.10). La presión sanguínea diastólica por encima de 95 mmHg estuvo asociada con el aumento de MVI en 63% versus 36% por debajo de 95 mmHg (p < 0.02). El IMC mostró una tendencia (31.1 versus 29.7 kg/m², p < 0.20) hacia valores más altos en pacientes con aumento de MVI. El IMC por encima de 28 kg/m² estuvo asociado con el aumento de MVI en 61% versus 44% por debajo del valor (p < 0.15). El aumento de la MVI había sido mayor en las hembras que en los varones (61% versus 44%, p = 0.30), debido posiblemente a un IMC más alto (31 versus 29.4 kg/m²) y a una presión sanguínea sistólica más elevada (160 versus 155 mmHg). La edad (48.3 versus 46.5 años, p = 0.30) y los años de hipertensión (8.6 versus 7.3 años, p = 0.33) no mostraron diferencias significativas entre los dos grupos. El tratamiento con medicamento fue reportado en 90% (69% monoterapia, 27% > un medicamento, 4% > 2 medicamentos) y no se asoció ningún medicamento a diferencias significativas en la MVI en comparación con los otros. Sólo el 15% de los pacientes hipertensos tratados tuvo presión sanguínea sistólica por debajo 140 mmHg y 8% tuvo presión diastólica por debajo de 90 mmHg. Se halló que el determinante mayor del aumento de la MVI en este grupo de pacientes hipertensos afrocaribeños, es la hipertensión controlada pobremente, siendo la obesidad uno de los factores contribuyentes posibles.

Correlation of anemia, secondary hyperparathyroidism with left ventricular hypertrophy in Chronic Kidney Disease patients.

AIMS: To demonstrate the correlation of anemia and intact parathormone with left ventricular hypertrophy in a cohort of Chronic Kidney Disease (CKD) patients in a tertiary care centre. METHODS: A cross-sectional study was done over 2 years on 230 renal failure patients (160 males, 70 females), aged 15-75 years, who had elevated serum creatinine and reduced GFR. The patients were assessed based on clinical history and a number of laboratory parameters including serum creatinine, calcium, iPTH level, Hb, Hct, GFR and LVMI. Settings : Patients were seen as inpatients and outpatients in a tertiary care centre. RESULTS : In CKD stages I, II and III, 51% of the patients had anemia Hb<11gm/dl), 16%of the patients had elevated iPTH, 79% of male patients and 71% of female patients had LVH. In Stage IV CKD, 55% of the patients had anemia, 25% of the patients had elevated iPTH, 74% of male patients and 100% of female patients had LVH. In stage V CKD, 76% of the patients had anemia, 31% of the patients had elevated iPTH, 77% of male patients and 96% of female patients had LVH. In all five stages, 78% of male patients and 71% of female patients with elevated iPTH had LVH, 81% of male patients and 90% of female patients with anemia had LVH. Systemic hypertension was present in 69% of the patients. CONCLUSION: Anemia is widely prevalent in our cohort of CKD patients. Severity of anemia is correlated to LVH and secondary hyperparathyroidism in these patients.

Left ventricular hypertrophy and LV geometry in chronic dialysis children and adolescents.

Data from USRDS and Thai Renal Replacement Therapy revealed cardiovascular disease is a common cause of death in ESRD patients. Left ventricular hypertrophy (LVH) is one of the risk factors however there are few studies about this in chronic dialysis children. In the present study, the authors retrospectively reviewed the prevalence of LVH and variable parameters correlated with LVMI in chronic dialysis patients in Phramongkutklao Hospital. Eleven hemodialysis and three peritoneal dialysis patients, aged 12.1 +/- 5 years, were included. LVH was diagnosed by calculating LVMI from echocardiographic study. Clinical and laboratory data were reviewed to compare parameters between LVH and without LVH groups. Prevalence of LVH was 57%. In the LVH group, 7 patients had eccentric LVH and 1 patient had concentric LVH. LVH patients had significantly high systolic BP (SBP), diastolic BP (DBP), index of SBP and index of DBP. Blood pressure also had positive correlation and patients age had negative correlation with LVMI. In conclusion, high blood pressure is associated with left ventricular hypertrophy. Serial echocardiography and long term follow up should be done in this patient group to prevent cardiovascular morbidity and mortality.

Hipertensão arterial e hipertrofia ventricular esquerda em diabetes mellitus tipo 2 / Arterial hypertension and left ventricular hypertrophy in type 2 diabetes mellitus

Para avaliar a prevalência de hipertensão arterial sistêmica (HAS) e da hipertrofia ventricular esquerda (HVE), bem como a associação entre ambas, em pacientes com diabetes mellitus tipo 2 (DM2), foram estudados 204 pacientes atendidos no Hospital Universitário Alcides Carneiro (HUAC) da Universidade Federal de Campina Grande – PB. Os pacientes apresentavam uma média de idade de 58,0±11,4 anos, sendo 64,2 por cento (n=131/204) do gênero feminino. A HAS esteve presente em 66,7 por cento (n=136/204) da amostra estudada, sendo mais freqüente nas mulheres (69,5 por cento), nos indivíduos dogrupo racial branco e ex-tabagistas. Observou-se uma associação estatisticamente significante entre HAS e a idade (p<0,0001), o tempo de evolução do diabetes (p<0,015), o tabagismo (p<0,009) e o aumento da circunferência abdominal (p<0,008). A HVE esteve presente em 11,3 por cento (23/204) dos pacientes, quando diagnosticada por critérios eletrocardiográficos. O ecocardiograma (ECO), realizado em 23 por cento (47/204) dos pacientes, mostrou uma prevalência de HVE de 76,6 por cento (36/47) e, apesar de ocorrer mais em hipertensos (85,2 por cento) que nos não-hipertensos (65,0 por cento), ao se avaliar a relação entre HAS e HVE, observou-se não existir associação estatisticamente significante entre essas variáveis, na amostra estudada (p>0,19). Concluiu-se que a prevalência de HAS foi de 66,7 por cento, na população estudada, relacionandose à idade, ao tempo de evolução do diabetes, ao tabagismo e ao aumento da circunferência abdominal. A HVE mostrou também uma elevada prevalência (76,6 por cento) quando avaliada utilizando-se o ECO, porém não relacionada de forma estatisticamente significante à HAS.

Complicações da hipertensão arterial em homens e mulheres atendidos em um ambulatório de referência / Complications of hypertension in men and women seen in a referral outpatient care unit

OBJETIVO: Avaliar se o sexo se associa à hipertrofia ventricular esquerda, ao acidente vascular cerebral e à insuficiência renal em hipertensos atendidos em ambulatório de referência. MÉTODOS: Dados de 622 hipertensos, admitidos com diagnóstico de hipertrofia ventricular esquerda baseado no eletrocardiograma, de insuficiência renal, na creatinina > 1,4 mg/dl, e de acidente vascular cerebral em história pregressa e exame físico. Regressão logística foi utilizada para estimar odds ratio da associação entre sexo e lesão de órgãos-alvo da hipertensão, ajustadas para raça, idade e sua duração. RESULTADOS: A média das idades foi 48,4±13,8 anos, 74,1 por cento eram mulheres, 84,9 por cento mulatos ou negros. Quase a metade dos homens e mais de 40 por cento das mulheres apresentavam pelo menos um evento definido com lesão órgão-alvo. Insuficiência renal foi maior nos homens, OR ajustada (ORa) = 2,73; (p=0,002). Nos pacientes brancos, a freqüência de acidente vascular cerebral foi significantemente (p=0,017) maior nos homens (4/33) do que nas mulheres (0/56) e, na análise para idade > 49 anos, a prevalência de hipertrofia ventricular esquerda foi significantemente maior em homens, ORa = 1,99; (p=0,024). CONCLUSAO: Os dados obtidos sugerem maior prevalência de insuficiência renal em homens do que em mulheres, de acidente vascular cerebral em homens brancos do que em mulheres brancas, e de hipertrofia ventricular esquerda em homens do que em mulheres com idade > 49 anos.

Raça e lesão de órgãos-alvo da hipertensão arterial em pacientes atendidos em um ambulatório universitário de referência na cidade de Salvador / Race and hypertensive target-organ damage in patients from an university-affiliated outpatient care referral clinic in the city of Salvador

OBJETIVO: Avaliar se a raça do paciente estaria associada à presença de hipertrofia ventricular esquerda, acidente vascular cerebral e insuficiência renal crônica em hipertensos atendidos em ambulatório de referência em Salvador-BA. MÉTODOS: Analisados dados de 622 pacientes com o primeiro atendimento em ambulatório de hipertensão, entre 1982 e 1986, e identificados os com história prévia ou seqüela de acidente vascular cerebral, hipertrofia ventricular esquerda ou insuficiência renal (creatinina sérica > 1,4 mg/dL). Modelos de regressão logística foram utilizados para estimar odds ratio (OR) da associação entre raça (mulatos ou negros vs brancos) e lesão de órgãos-alvo de hipertensão, ajustadas para sexo e idade. RESULTADOS: A média de idade dos pacientes foi 53,8±14,3 anos, 74,1 por cento mulheres. Quanto à raça, 15,1 por cento eram brancos, 65,9 por cento mulatos e 19,0 por cento negros. Acidente vascular cerebral foi significantemente mais freqüente em negros ou mulatos do que em brancos (odds ratio ajustada (ORa)=3,44; intervalo de confiança (IC) 95 por cento=1,23-9,67). Quanto às associações envolvendo raça com os eventos hipertrofia ventricular esquerda e insuficiência renal as ORa não foram estatisticamente significantes, mas foram consistentes com maior prevalência de hipertrofia ventricular esquerda e insuficiência renal em negros e mulatos. CONCLUSAO: Negros e mulatos hipertensos têm maior risco de lesão de órgão alvo do que brancos, com diferença racial maior para acidente vascular cerebral não fatal. Deve ser avaliada se diferenças raciais em mortalidade relacionada a complicações da hipertensão influenciam as associações observadas entre raça e lesão de órgãos-alvo.

La hipertrofia ventricular izquierda (HVI) en hipertensión arterial (HTA) / Left ventricular hipertrophy in hypertension

La hipertrofia ventricular izquierda (HVI) en la hipertensión arterial es un proceso compensatorio de adaptación al estrés parietal aumentado que, sin embargo, genera cardiopatía. Se revisa la prevalencia de esta patología, aspectos moleculares que genera la hipertrofia, cómo se diagnostica y cuáles son sus determinantes. También se expone el concepto de hipertrofia ventricular izquierda inapropiada y cómo es la función ventricular en el corazón HVI, su pronóstico y el fenómeno de regresión de ella, considerando medidas no farmacológicas y farmacológicas. Finalmente se explica cómo está la reserva coronaria en esta patología.

The prevalence of left ventricular hypertrophy and associated factors in a Thai population.

Electrocardiographic left ventricular hypertrophy (LVH) has been a bad prognostic factor for cardiovascular morbidity and mortality. However the prevalence and prognostic value of LVH are varied among nationalities and populations. Several factors have been shown to associate with LVH. Some factors are treatable such as hypertension. We prospectively studied the prevalence of LVH and associated factors in selected group of Thai population. The study population was 1,606 Shinawatra employees who were 30 year old or more. The prevalence of LVH was 13 per cent (210) among study population. Hypertension, lower body weight and male sex were significantly associated factors. In the subjects with LVH, the prevalence of hypertension was 25.6 per cent, male ratio was 5:1 and mean body weight was 57.7 kg, compare to 9.8 per cent prevalence of hypertension, 2:1 female ratio and mean body weight was 62.3 kg in the group without LVH.

Echocardiographically detected left ventricular hypertrophy: prevalence and risk factors in Thai elderly men and women.

OBJECTIVE: To find the prevalence of and risk factors associated with echocardiographically determined left ventricular hypertrophy (LVH) in the general Thai elderly men and women. BACKGROUND: The prevalence of LVH and risk factors is not at present available for precise assessment of the seriousness in the general Thai population. The prevalence of LVH may be influenced by race, obesity, age, sex and hypertension. Their effects on left ventricular mass (LVM) have not been defined in the general Thai population. METHOD: A cohort of 157 subjects 60 years of age and over was studied. LVM was calculated using the modification of the ASE cube formula. Criteria for LVH were based on various LVM indexation using the published conventional partition values. Univariate and multivariate analyses with various variables were studied. RESULT: M-mode echocardiographic studies of adequate quality were obtained in 125 (80%) of 157 participants. Prevalence of LVH depended on the different types of indexation. LVH defined by 1) unindexes LVM (> or = 259g in men (M), > or = 166 g in women (F)) was 35(28%); 2) defined by LVM/BSA (> or = 131 g/m2 in M, > or = 100g/m2 in F) 63 (50%); 3) (> or = 117 g/m2 in M, > or = 104 g/m2 in F) 68 (54%); 4) (> or = 125 g/m2 in both M and F) 43 (34%); 5) defined by LVM/ height (> or = 143 g/m in M and > or = 102 g/m in F) 49 (39%); 6) (> or = 126 g/m in M and > or = 105 g/m in F) 52 (42%); 7) defined by LVM/height2.7 (> or = 51 g/m2.7 in both M and F) 62 (50%); 8) (> or = 50 g/m2.7 in M, > or = 47 g/m2.7 in F) 77 (62%). The following variables independently predicted LVM in descending order of statistical significance: BW, BMI, SBP, PP, height were the most significant (p < 0.01), whereas, DBP and gender made smaller contributions and age showed no correlation. In multivariate analysis only BW and PP showed significant correlation with LVM in the total population. CONCLUSION: LVH is a common echocardiographic finding in Thai elderly (28-62%). Body weight and PP are major risk factors. These findings support weight reduction and PP control for prevention or regression of this condition. Indexing for BSA (LVM/BSA >117 g/m2 in M, > or = 104 g/m2 in F) reduces LVH variability in underweight, normal weight and overweight subgroups as well as sexes.