Diferencia esperada de progenie para peso al destete en selección de vaquillas mestizas en Manabí / Expected progeny difference for the weaning weight in crossbred heifers selection in Manabí

RESUMEN Objetivo. Determinar la diferencia esperada de la progenie (DEP) para el peso al destete ajustado a 205 días (PD) en hembras Brahman mestizas nacidas en el año 2016 como criterio de selección de futuras reproductoras. Materiales y métodos. Se analizaron 3467 registros generados entre 1983 y 2016 en la hacienda Napo (San Vicente, Manabí, Ecuador). El modelo estadístico y animal incluyó el efecto aleatorio del padre y como efectos fijos: composición racial, sexo y año de nacimiento. El análisis de la varianza fue realizado mediante el procedimiento GLM del paquete estadístico SAS. Los componentes de la varianza entre y dentro de padre para calcular la heredabilidad (h2) del PD y los valores de cría, se utilizó el software MTDFRELM, a través del sistema de evaluación del Mejor Predictor Lineal Insesgado (BLUP). Resultados. Para las 349 hembras nacidas en 2016 se encontró un promedio para PD de 173.67±34.23 kg. Se halló diferencia altamente significativa (p<0.01) para los efectos aleatorios y fijos, h2 para PD de 0.13 ± 0.04 y las DEP variaron entre -6.13 y +5.58 kg con rango entre los valores de cría de 11.71 kg y una exactitud entre 0.50 y 0.72. Conclusión. La baja h2 encontrada para PD manifiesta la alta influencia de los factores no genéticos, sin embargo las hembras con mayor valor DEP pueden mejorar el desempeno en este parámetro; se hace necesario identificar el mejor cruce racial que se adapte a la explotación con el fin de obtener crías con alto rendimiento en el PD.

ABSTRACT Objective. Determine the progeny difference expected (DEP) for the weaning weight adjusted to 205 days (PD) in crossbreed Brahman females born in 2016 as selection criteria for future breeders. Materials and methods. It is analyzed 3467 records generated between 1983 and 2016 in the Napo farm (San Vicente, Manabí, Ecuador). The statistical model included the random effect of the father and as fixed effects: breed composition, sex and year of birth. The variance analysis was performed using the GLM procedure of the SAS statistical package. The components of the variance between and within the father to calculate the heritability (h2) of the PD and the breeding values, the MTDFRELM software was used, applying the animal model, through the evaluation system of the Best Linear Unbiased Predictor (BLUP). Results. It was found that the PD average for the 349 females born in 2016 was 173.67±34.23 kg. A highly significant difference (p<0.01) was found for the random and fixed effects. The h2 for PD was 0.13±0.04. The DEP fluctuated between -6.13 and +5.58 kg with a range between the breeding values of 11.71 kg and an accuracy between 0.50 and 0.72. Conclusion. The low h2 found for PD shows the high influence of non-genetic factors; it is necessary to identify the best crossbreed that adapts to the livestock in order to obtain high performance products in the PD.

Severe aortic stenosis patients with preserved ejection fraction according to flow and gradient classification: Prevalence and outcomes.

BACKGROUND: Clinicians often encounter patients with apparently discordant echocardiographic findings, severe aortic stenosis (SAS) defined by aortic valve area (AVA) despite a low mean gradient. A new classification according to flow state and pressure gradient has been proposed. We sought to assess the prevalence, characteristics and outcomes of patients with asymptomatic SAS with preserved left-ventricular ejection fraction (LVEF) according to flow and gradient. METHODS AND RESULTS: In total 442 patients with SAS (AVAi<0.6 cm2/m2) and LVEF ≥50% (mean age 80+11years, 54,5% female) were included. Patients were classified according to flow state (≥ or <35ml/m2) and mean pressure gradient (≥ or <40mmHg): Low Flow/Low Gradient (LF/LG): 21.3%(n=94); Normal Flow/Low Gradient (NF/LG): 32.1%(n=142); Low Flow/High Gradient (LF/HG): 6.8%(n=30); Normal Flow/High Gradient (NF/HG): 39,8%(n=176). Mean follow-up time was 20.5months (SD=10.3). Primary combined endpoint was cardiovascular mortality and hospital admission for SAS related symptom, secondary endpoint was aortic valve replacement (AVR), comparing HG group to LF/LG group. During follow-up 17 (18%) of LF/LG patients and 21 (10.2%) of HG patients met the primary endpoint. A lower free of event survival (cardiovascular mortality and hospital admission) was observed in patients with LF/LG AS (Breslow, p=0.002). Significant differences were noted between groups with a lower AVR free survival in the LF/LG group compared to HG groups (Breslow, p=0.002). CONCLUSIONS: Our study confirms the high prevalence and worse prognosis of LF/LG SAS. Clinicians must be aware of this entity to ensure appropriate patient management.

True morphology of mitral regurgitant flow assessed by three-dimensional transesophageal echocardiography.

INTRODUCTION: Quantification of mitral regurgitation (MR) by two-dimensional (2D) transthoracic echocardiography (TTE) is based on the analysis of the proximal flow convergence (PFC) and the "vena contracta" (VC). This method assumes geometries and can be misleading. In contrast, three-dimensional (3D) echocardiography directly measures flow volumes and does not assume geometries, which allows for more accurate MR evaluation. AIMS: To report the 3D transesophageal echocardiography (3DTEE) feasibility for MR quantification and evaluate its concordance with 2D echo. METHODS: Twenty-seven consecutive patients undergoing 2D and 3DTEE for presurgical MR evaluation were studied prospectively. MR quantification was performed by classical 2D methods based on PFC. Diameters of the VC in orthogonal planes by 3DTEE were estimated, establishing the VC sphericity index as well as VC area (VCA) by direct planimetry. In case of multiple jets, we calculated the sum of the VCA. RESULTS: MR assessment by 3DTEE was feasible. An adequate concordance between VC measurements by 2D methods (TTE and TEE) was observed; however, there was a poor correlation when compared with 3DTEE. The sphericity index of the VC was: 2.08 (±0. 72), reflecting a noncircular VC. CONCLUSIONS: 3DTEE is a feasible method for the assessment of the MR true morphology, allowing a better quantification of MR without assuming any geometry. This method revealed the presence of multiple jets, potentially improving MR evaluation and leading to changes in medical decision when compared to 2D echo assessment.

Miocardiopatía arritmogénica del ventrículo derecho: Breve revisión de la literatura a propósito de un caso / Arrhythmogenic right ventricular cardiomyopathy: Case report and a brief literature review

Hombre de 51 años admitido en el hospital por presentar palpitaciones y mareos de 2 h de evolución. El electrocardiograma demostró taquicardia regular de QRS ancho y frecuencia cardíaca de 250 lpm, con eje superior y morfología de bloqueo completo de rama izquierda sin descompensación hemodinámica. Se administraron dosis de carga y mantenimiento con amiodarona, revirtiendo a ritmo sinusal. El estudio electrofisiológico demostró el origen ventricular de la taquicardia y su inducibilidad. En la angiografía coronaria no se observaron lesiones significativas en los vasos epicárdicos. Se realizó un ecocardiograma Doppler que presentó cavidades con diámetros y función sistólica y diastólica dentro de los parámetros normales. Ante la sospecha de enfermedad estructural miocárdica se llevó a cabo una resonancia magnética cardíaca contrastada con realce tardío que demostró alteración estructural del ventrículo derecho con incremento de la trabeculación e infiltración fibrograsa parietal y deterioro moderado de su función sistólica, y deterioro leve de la función sistólica del ventrículo izquierdo, lo cual permitió realizar el diagnóstico de miocardiopatía arritmogénica del ventrículo derecho por presentar 2 criterios mayores. Se decidió implantar un cardiodesfibrilador automático, para prevenir la muerte súbita. El paciente evolucionó de manera favorable y fue dado de alta.

A 51-year-old man was admitted to this hospital because of palpitations and a feeling of dizziness for a period of 2h. The electrocardiogram revealed a regular wide-QRS complex tachycardia at a rate of 250 beats per minute, with superior axis and left bundle branch block morphology without hemodynamically decompensation, the patient was cardioverted to sinus rhythm after the administration of a loading and maintenance dose of amiodarone. The elechtrophysiological study showed the ventricular origin of the arrhythmia. In order to diagnose the etiology of the ventricular tachycardia we performed a coronary arteriography that showed normal epicardial vessels, thus ruling out coronary disease. Doppler echocardiography revea- led systolic and diastolic functions of both left and right ventricles within normal parameters, and normal diameters as well. A cardiac magnetic resonance with late enhancement was done, showing structural abnormalities of the right ventricle wall with moderate impairment of the ejection fraction, and a mild dysfunction of the left ventricle. The diagnosis of arrhythmogenic right ventricular cardiomyopathy was performed as 2 major Task Force criteria were met. We implanted an automatic cardioverter defibrillator as a prophylactic measure. The patient was discharged without complications.

[Arrhythmogenic right ventricular cardiomyopathy. Case report and a brief literature review]. / Miocardiopatía arritmogénica del ventrículo derecho. Breve revisión de la literatura a propósito de un caso.

A 51-year-old man was admitted to this hospital because of palpitations and a feeling of dizziness for a period of 2h. The electrocardiogram revealed a regular wide-QRS complex tachycardia at a rate of 250 beats per minute, with superior axis and left bundle branch block morphology without hemodynamically decompensation, the patient was cardioverted to sinus rhythm after the administration of a loading and maintenance dose of amiodarone. The elechtrophysiological study showed the ventricular origin of the arrhythmia. In order to diagnose the etiology of the ventricular tachycardia we performed a coronary arteriography that showed normal epicardial vessels, thus ruling out coronary disease. Doppler echocardiography revealed systolic and diastolic functions of both left and right ventricles within normal parameters, and normal diameters as well. A cardiac magnetic resonance with late enhancement was done, showing structural abnormalities of the right ventricle wall with moderate impairment of the ejection fraction, and a mild dysfunction of the left ventricle. The diagnosis of arrhythmogenic right ventricular cardiomyopathy was performed as 2 major Task Force criteria were met. We implanted an automatic cardioverter defibrillator as a prophylactic measure. The patient was discharged without complications.

Mejoría de la capacidad funcional tras tratamiento con levotiroxina en pacientes con insuficiencia cardíaca crónica e hipotiroidismo subclínico / Improvement in functional capacity after levothyroxine treatment in patients with chronic heart failure and subclinical hypothyroidism

OBJETIVO: Evaluar si el tratamiento con levotiroxina mejora la capacidad funcional en pacientes con insuficiencia cardíaca crónica clase funcional i-iii de la New York Heart Association e hipotiroidismo subclínico. MÉTODOS: Se incluyeron 163 pacientes ambulatorios con insuficiencia cardíaca crónica estable y con un mínimo de seguimiento de 6 meses. Se realizó un examen clínico y se solicitaron pruebas de laboratorio que incluyeron hormonas tiroideas, ecocardiograma con doppler, ventriculografía radioisotópica y un estudio Holter. La capacidad funcional se evaluó por medio de una caminata de 6min. Se detectaron los pacientes con hipotiroidismo subclínico que recibieron tratamiento sustitutivo y, una vez con valores normales de tirotropina (TSH), se les realizó una nueva caminata de 6min. Se registraron los metros recorridos en cada prueba y se analizó la diferencia de los metros caminados en cada paciente. RESULTADOS: Observamos una prevalencia de hipotiroidismo subclínico del 13% en pacientes con insuficiencia cardíaca. Mientras se encontraban hipotiroideos, los metros recorridos fueron de 292 ± 63, y una vez alcanzados valores normales de TSH, de 350 ± 76. La diferencia en metros fue de 58 ± 11 (p < 0,011). Los pacientes con valores normales de TSH no mostraron diferencias significativas entre las 2 pruebas. CONCLUSIONES: Los pacientes con insuficiencia cardíaca crónica e hipotiroidismo subclínico, una vez eutiroideos, mejoraron de forma significativa su rendimiento físico

AIM: To assess whether levothyroxine treatment improves functional capacity in patients with chronic heart failure (New York Heart Association class i-iii) and subclinical hypothyroidism. METHODS: One hundred and sixty-three outpatients with stable chronic heart failure followed up for at least 6 months were enrolled. A physical examination was performed, and laboratory tests including thyroid hormone levels, Doppler echocardiogram, radionuclide ventriculography, and Holter monitoring were requested. Functional capacity was assessed by of the 6-min walk test. Patients with subclinical hypothyroidism were detected and, after undergoing the s6-min walk test, were given replacement therapy. When they reached normal thyrotropin (TSH) levels, the 6-min walk test was performed again. The distance walked in both tests was recorded, and the difference in meters covered by each patient was analyzed. RESULTS: Prevalence of subclinical hypothyroidism in patients with heart failure was 13%. These patients walked 292 ± 63 m while they were hypothyroid and 350 ± 76m when TSH levels returned to normal, a difference of 58 ± 11 m (P < .011). Patients with normal baseline TSH levels showed no significant difference between the 2 6-min walk tests. CONCLUSIONS: Patients with chronic heart failure and subclinical hypothyroidism significantly improved their physical performance when normal TSH levels were reached

[Improvement in functional capacity after levothyroxine treatment in patients with chronic heart failure and subclinical hypothyroidism]. / Mejoría de la capacidad funcional tras tratamiento con levotiroxina en pacientes con insuficiencia cardíaca crónica e hipotiroidismo subclínico.

AIM: To assess whether levothyroxine treatment improves functional capacity in patients with chronic heart failure (New York Heart Association class i-iii) and subclinical hypothyroidism. METHODS: One hundred and sixty-three outpatients with stable chronic heart failure followed up for at least 6 months were enrolled. A physical examination was performed, and laboratory tests including thyroid hormone levels, Doppler echocardiogram, radionuclide ventriculography, and Holter monitoring were requested. Functional capacity was assessed by of the 6-min walk test. Patients with subclinical hypothyroidism were detected and, after undergoing the s6-min walk test, were given replacement therapy. When they reached normal thyrotropin (TSH) levels, the 6-min walk test was performed again. The distance walked in both tests was recorded, and the difference in meters covered by each patient was analyzed. RESULTS: Prevalence of subclinical hypothyroidism in patients with heart failure was 13%. These patients walked 292±63m while they were hypothyroid and 350±76m when TSH levels returned to normal, a difference of 58±11m (P<.011). Patients with normal baseline TSH levels showed no significant difference between the 2 6-min walk tests. CONCLUSIONS: Patients with chronic heart failure and subclinical hypothyroidism significantly improved their physical performance when normal TSH levels were reached.

[QTc interval prolongation and polymorphic ventricular tachycardia related to subarachnoid hemorrhage]. / Intervalo QTc prolongado y taquicardia ventricular polimórfica ligada a hemorragia subaracnoidea.

A 55-yr-old woman was taken to the hospital after recovering from a presyncopal episode. The electrocardiogram showed sinus bradycardia with QTc interval of 840 msec. Few minutes later, the patient developed a polymorphic ventricular tachycardia and subsequent cardiac arrest requiring cardiopulmonary resuscitation. A week later she presented with severe headache, seizures and decerebrate movements. Cranial computed tomography scan showed subarachnoid hemorrhage with intracranial hypertension requiring decompressive craniectomy. On the follow- up the electrocardiograms always showed prolonged QTc interval, without any new arrhythmic event. The patient's clinical course was unfavorable and required maximum dose of vasoactive drugs. She died 13 days after admission.

Intervalo QTc prolongado y taquicardia ventricular polimórfica ligada a hemorragia subaracnoidea / QTc interval prolongation and polymorphic ventricular tachycardia related to subarachnoid hemorrhage

Mujer de 55 años trasladada al hospital luego de recuperarse de un episodio presincopal. El electrocardiograma mostró bradicardia sinusal con intervalo QT corregido de 840 mseg. Pocos minutos después la paciente presenta episodio de taquicardia ventricular polimórfica y posterior paro cardiorrespiratorio que requirió maniobras de reanimación cardiopulmonar avanzada que fueron efectivas. A la semana presentó cefalea intensa y convulsiones con movimientos de descerebración. La tomografía axial computarizada de cerebro mostró hemorragia subaracnoidea con hipertensión intracraneal que requirió craniectomía descompresiva. Durante la internación todos los electrocardiogramas evidenciaron el QT corregido prolongado, pero la paciente no presentó un nuevo evento arrítmico. La paciente evolucionó desfavorablemente requiriendo fármacos vasoactivos en dosis máximas. Falleció a los 13 días de su admisión.

A 55-yr-old woman was taken to the hospital after recovering from a presyncopal episode. The electrocardiogram showed sinus bradycardia with QTc interval of 840 msec. Few minutes later, the patient developed a polymorphic ventricular tachycardia and subsequent cardiac arrest requiring cardiopulmonary resuscitation. A week later she presented with severe headache, seizures and decerebrate movements. Cranial computed tomography scan showed subarachnoid hemorrhage with intracranial hypertension requiring decompressive craniectomy. On the follow- up the electrocardiograms always showed prolonged QTc interval, without any new arrhythmic event. The patient's clinical course was unfavorable and required maximum dose of vasoactive drugs. She died 13 days after admission.

Revisando el concepto de desarrollo sostenible en el discurso social / Reviewing the concept of sustainable development in social discourse

Esta investigación surge con un afán prospectivo sobre lo que las personas entienden por Desarrollo Sostenible con el objetivo de conocer cuáles son las dimensiones que subyacen al concepto y ver en qué medida éstas son moduladas tanto por la ideología política como por la forma de relacionarse con la Naturaleza. Para ello se hace un análisis de contenido de 132 definiciones de Desarrollo Sostenible. En ellas se observan 10 dimensiones entre las que destacan "desarrollo" y "la Naturaleza y medio ambiente". En las entrevistadas, se detecta una pérdida de contenidos con respecto a la definición de la Comisión Mundial del Medio Ambiente y del Desarrollo (CMMAD), lo que sugiere que existen dificultades a la hora de precisar en el proceso de comunicación, qué se entiende por este concepto. La posición ante la Naturaleza modula la forma de entender este concepto, no así la ideología política que se atribuyen las participantes (AU)

This study originated as an investigation into what people mean by Sustainable Development. It attempted to discover the dimensions underlying the concept and to find out how these are modified by political beliefs or by ways of relating to nature. To achieve this aim, a content analysis was carried out to analyse 132 definitions of Sustainable Development. Within these definitions, 10 dimensions were observed, among which «development» and «nature and the environment» stood out. The study showed that there was a loss of elements among the interviewees with regard to the WCED definition. This suggests that there are communication problems, which affect the expression of what exactly is meant by the concept. Attitudes towards nature affect the way in which this concept is understood, and not the political beliefs of the participants (AU)