Guía de práctica clínica mexicana para el diagnóstico y tratamiento de las dislipidemias y enfermedad cardiovascular aterosclerótica

ANTECEDENTES

Las enfermedades cardiovasculares son la principal causa mundial de mortalidad y México no es la excepción. Los datos epidemiológicos obtenidos en 1990 mostraron que los padecimientos cardiovasculares representaron el 19.8% de todas las causas de muerte en nuestro país; esta cifra se incrementó de manera significativa a un 25.5% para 2015. Diversas encuestas nacionales sugieren que más del 60% de la población adulta tiene al menos un factor de riesgo para padecer enfermedades cardiovasculares (obesidad o sobrepeso, hipertensión, tabaquismo, diabetes, dislipidemias). Por otro lado, datos de la Organización Panamericana de la Salud han relacionado el proceso de aterosclerosis como la primer causa de muerte prematura, reduciendo la expectativa de vida de manera sensible, lo que tiene una enorme repercusión social.

OBJETIVO

Este documento constituye la guía de práctica clínica (GPC) elaborada por iniciativa de la Sociedad Mexicana de Cardiología en colaboración con la Sociedad Mexicana de Nutrición y Endocrinología, A.C., Asociación Nacional de Cardiólogos de México, A.C., Asociación Mexicana para la Prevención de la Aterosclerosis y sus Complicaciones, A.C., Comité Normativo Nacional de Medicina General, A.C., Colegio Nacional de Medicina Geriátrica, A.C., Colegio de Medicina Interna de México, A.C., Sociedad Mexicana de Angiología y Cirugía Vascular y Endovenosa, A.C., Instituto Mexicano de Investigaciones Nefrológicas, A.C. y la Academia Mexicana de Neurología, A.C.; con el apoyo metodológico de la Agencia Iberoamericana de Desarrollo y Evaluación de Tecnologías en Salud, con la finalidad de establecer recomendaciones basadas en la mejor evidencia disponible y consensuadas por un grupo interdisciplinario de expertos. El objetivo de este documento es el de brindar recomendaciones basadas en evidencia para ayudar a los tomadores de decisión en el diagnóstico y tratamiento de las dislipidemias en nuestro país.

MATERIAL Y MÉTODOS

Este documento cumple con estándares internacionales de calidad, como los descritos por el Instituto de Medicina de EE.UU., el Instituto de Excelencia Clínica de Gran Bretaña, la Red Colegiada para el Desarrollo de Guías de Escocia y la Red Internacional de Guías de Práctica Clínica. Se integró un grupo multidisciplinario de expertos clínicos y metodólogos con experiencia en revisiones sistemáticas de la literatura y el desarrollo de guías de práctica clínica. Se consensuó un documento de alcances, se establecieron las preguntas clínicas relevantes, se identificó de manera exhaustiva la mejor evidencia disponible evaluada críticamente en revisiones sistemáticas de la literatura y se desarrollaron las recomendaciones clínicas. Se utilizó la metodología de Panel Delphi modificado para lograr un nivel de consenso adecuado en cada una de las recomendaciones contenidas en esta GPC.

RESULTADOS

Se consensuaron 23 preguntas clínicas que dieron origen a sus respectivas recomendaciones clínicas.

CONCLUSIONES

Esperamos que este documento contribuya a la mejor toma de decisiones clínicas y se convierta en un punto de referencia para los clínicos y pacientes en el manejo de las dislipidemias y esto contribuya a disminuir la morbilidad y mortalidad derivada de los eventos cardiovasculares ateroscleróticos en nuestro país.

BACKGROUND

Cardiovascular diseases are the leading cause of mortality worldwide and Mexico is no exception. The epidemiological data obtained in 1990 showed that cardiovascular diseases represented 19.8% of all causes of death in our country. This figure increased significantly to 25.5% for 2015. Some national surveys suggest that more than 60% of the adult population has at least one risk factor for cardiovascular disease (obesity or overweight, hypertension, smoking, diabetes, dyslipidemias). On the other hand, data from the Pan American Health Organization have linked the process of atherosclerosis as the first cause of premature death, significantly reducing life expectancy, which has enormous social repercussions.

OBJECTIVE

This document constitutes the Clinical Practice Guide (CPG) prepared at the initiative of the Mexican Society of Cardiology in collaboration with the Mexican Society of Nutrition and Endocrinology, AC, National Association of Cardiologists of Mexico, AC, Mexican Association for the Prevention of Atherosclerosis and its Complications, AC, National Normative Committee of General Medicine, AC, National College of Geriatric Medicine, AC, College of Internal Medicine of Mexico, AC, Mexican Society of Angiology and Vascular and Endovenous Surgery, AC, Mexican Institute of Research Nephrological, AC and the Mexican Academy of Neurology, A.C.; with the methodological support of the Ibero-American Agency for the Development and Evaluation of Health Technologies, in order to establish recommendations based on the best available evidence and agreed upon by an interdisciplinary group of experts. The objective of this document is to provide evidence-based recommendations to help decision makers in the diagnosis and treatment of dyslipidemias in our country.

MATERIAL AND METHODS

This document complies with international quality standards, such as those described by the Institute of Medicine of the USA, the Institute of Clinical Excellence of Great Britain, the Scottish Intercollegiate Guideline Network and the Guidelines International Network. A multidisciplinary group of clinical experts and methodologists with experience in systematic reviews of the literature and the development of clinical practice guidelines was formed. A scope document was agreed upon, relevant clinical questions were established, the best available evidence critically evaluated in systematic literature reviews was exhaustively identified, and clinical recommendations were developed. The modified Delphi Panel methodology was used to achieve an adequate level of consensus in each of the recommendations contained in this CPG.

RESULTS

23 clinical questions were agreed upon which gave rise to their respective clinical recommendations.

CONCLUSIONS

We consider that this document contributes to better clinical decision-making and becomes a point of reference for clinicians and patients in the management of dyslipidemias and this contributes to reducing the morbidity and mortality derived from atherosclerotic cardiovascular events in our country.

Relationship between protein-energy wasting in adults with chronic hemodialysis and the response to treatment with erythropoietin

BACKGROUND

It is known that one of the leading causes of morbidity in chronic kidney disease (CKD) is the anemic syndrome. Although the pathogenic mechanisms of anemia are multiple, erythropoietin deficiency appears as the dominant factor. Patients in hemodialysis (HD) have a high prevalence of protein energy wasting (PEW) that may explains the poor response to Erythropoietin (EPO).

METHODS

Retrospective cohort study of patients on HD from January to December 2014. The participants were classified according to a diagnostic of PEW using the "Malnutrition Inflammation Score" (MIS) and bioimpedance analysis (BIA) measurement of body composition at the start of erythropoietin therapy and after 3 months of follow up. We performed descriptive statistics and analyzed the differences between groups with and without PEW considering their responsiveness. In addition, we calculated the relative risk of EPO resistance, considering p value < 0.05 as statistically significant.

RESULTS

Sixty-one patients ended the follow up. Both groups were similar in basal hemoglobin, hematocrit and other hematopoiesis markers (p = NS). Patients without PEW have a decrease risk for poor response to treatment with EPO (RR = 0.562 [95% CI, 0.329-0.961-]) than those with PEW. Finally, hemoglobin concentrations were evaluated at baseline and every four weeks until week 12, finding a statistically significant improvement only in patients without PEW according MIS (p < 0.05).

CONCLUSIONS

PEW is an incremental predictor of poor responsiveness to EPO in HD patients, thus, it is important to consider correcting malnutrition or wasting for a favorable response to treatment with EPO.

[Acceso vascular en apoyo renal agudo]

El acceso vascular es el primer eslabón para la terapia de apoyo extracorpórea renal. A diferencia de la terapia de reemplazo renal para pacientes con enfermedad renal crónica donde la fístula arteriovenosa es la primera opción, seguida del catéter tunelizado, en pacientes con lesión renal aguda el acceso vascular de elección es el catéter temporal. El presente estudio constituye una revisión narrativa de resumen de los estudios que analizan la elección, colocación y cuidados del acceso vascular temporal para apoyo renal agudo. En pacientes que cuentan con fístula arteriovenosa preexistente, su punción en pacientes con inestabilidad hemodinámica conlleva riesgos y no puede ser recomendada. El uso del catéter tunelizado de primera intención implica una destreza, tiempo y costos que limitan igualmente su recomendación. El cambio de catéteres por guía metálica ha mostrado ser un método seguro en ausencia de infección del catéter a retirar. El acceso femoral ha mostrado no ser inferior al acceso yugular derecho, mientras el acceso yugular izquierdo reduce la vida del circuito y debe ser considerado como cuarta opción después del yugular derecho, el femoral derecho y el femoral izquierdo. La longitud del acceso debe evaluarse de acuerdo con el sitio de inserción, mientras que los catéteres de 20 cm suelen ser adecuados para punción de la yugular derecha, la yugular izquierda suele requerir 25 cm para su llegada a la aurícula derecha. Por su parte, el acceso femoral incrementa su desempeño con longitudes de 25 a 35 cm. La punción yugular posterior baja derecha es considerada una técnica de abordaje sencilla, segura y que permite una aproximación de hasta 5 cm más caudal hacia la aurícula derecha. La interacción entre catéteres centrales debe ser anticipada o evaluada ante el riesgo de aspiración de infusiones por el circuito extracorpóreo. En el cuidado del catéter, la aplicación de heparina 1,000 U/ml reduce el riesgo de sangrado al sellar los puertos comparada con heparina 5,000 U/ml. Por último, se presenta información sobre la elección de dispositivos de cobertura, el método de fijación, los materiales de recubrimiento de catéteres y el empleo de antibióticos, incluyendo las posturas de las guías del Kidney Dialysis Improving Global Outcomes (KDIGO) y la European Renal Best Practice (ERBP), además de la información disponible en el consenso del Acute Dialysis Quality Initiative, revisiones sistemáticas, metaanálisis y ensayos clínicos controlados.

Vascular access is the first link for renal extracorporeal support therapy. Unlike renal replacement therapy for patients with end-stage renal disease where the arteriovenous fistula is the first option, followed by the tunneled catheter, in patients with acute kidney injury a temporary catheter is the first choice. The present article constitutes a narrative review summarizing the studies that analyze the choice, placement and care of temporary vascular access for acute renal support. In patients who have a pre-existing arteriovenous fistula, their puncture in patients with hemodynamic instability carries risks and cannot be recommended. The use of tunneled catheter as first option implies a complex, time-consuming procedure with higher cost that also limits its recommendation. The change of catheters by metal guide has shown to be a safe method in the absence of infection. Femoral access has been shown not to be inferior to right jugular access, while left jugular access reduces the life of the circuit and should be considered as a fourth option after right jugular, right femoral and left femoral sites. The length of the access should be evaluated according to the insertion site, while 20 cm catheters are usually suitable for right jugular puncture, the left jugular usually requires 25 cm for achieving the position inside the right atrium. On the other hand, the femoral access increases its performance with lengths of 25-35 cm. The low posterior jugular approach is considered a simple, safe technique that allows up to 5 cm further towards the right atrium. The interaction between central catheters must be anticipated or evaluated because of the risk of aspiration of infusions by the extracorporeal circuit. The use of heparin 1000 U/ml for sealing the ports reduces the risk of bleeding compared to heparin 5000 U/ml. The reasoning on the evolution of catheters in structural coating materials, the decision on using a suture, the differences among dressings or securement devices, and the controversy over the use of antibiotics for sealing ports and for dressings are also discussed. The review includes the positions of the guidelines by the Kidney Dialysis Improving Global Outcomes and the European Renal Best Practice, in addition to the information available mainly on the consensus of the acute dialysis quality initiative, systematic reviews, meta-analysis and controlled clinical trials.

Purity and stability of online-prepared hemodiafiltration fluid after storage

BACKGROUND/AIMS

Previous studies have suggested that online hemodiafiltration (OL-HDF) fluid can be used as dialysate for continuous renal replacement therapies, and thus HDF costs can be reduced. The aims of this study were to determine the purity of OL-HDF fluid and to verify the stability of the electrolyte composition and acid-base balance during its storage.

METHODS

OL-HDF fluid was collected in 70 individual bags and stored for up to 7 days. The following tests were performed daily in 10 bags: natural visible precipitation (macrocrystallization), sample collection for chemical analysis and fluid culture, limulus amebocyte lysate endotoxin test, standard culture of NALGENE® filters after passing of the fluid, and molecular analysis of bacterial DNA.

RESULTS

The values of pH and pCO(2) showed a significant change starting at 24 h (p < 0.001); after 72 h, their values were beyond the measurable range. Coefficient of variation for pCO(2) was as high as 25.7%. Electrolyte composition (Na(+), K(+), Cl(-), Ca(2+) and glucose) showed a statistically significant difference over time (p < 0.05); however, their coefficients of variation were low (1.7, 1.4, 0.6, 2.3 and 0.9%, respectively), which might not be considered clinically significant. Negative results were obtained at all points by fluid and filter cultures, endotoxin test and molecular analysis. No macrocrystallization was observed at any time point.

CONCLUSIONS

We demonstrate the microbiological purity of OL-HDF fluid stored for up to 7 days. The electrolyte composition was stable, except for a relevant change in pCO(2) and consequently in pH (first noted at 24 h), emphasizing the need to reassess the acid-base balance in multilayer plastic bags in future studies.