Análisis crítico de un antimicrobiano sub-óptimo, de frecuente sobre-utilización e inadecuada dosificación: vancomicina / Critical review of a suboptimal antibiotic, frequently overused and inappropriately dosed: vancomycin

Resumen Introducción: Vancomicina, terapia estándar para enterococos y estafilococos resistentes a β-lactámicos tradicionales (Staphylococcus aureus [SARM] y Staphylococcus coagulasa negativa), tiene extenso uso empírico en infecciones nosocomiales. Farmacológicamente débil, de estrecho margen terapéutico y farmacocinética poco predecible, es un fármaco sub-estándar según criterios contemporáneos. Tiene excesivo uso, por sobrediagnóstico de infecciones bacterianas y, en infecciones genuinas, por sobre-estimación etiológica de patógenos β-lactámico-resistentes. Últimamente han surgido nuevas amenazas a su efectividad: peores desenlaces en infecciones por SARM con CIM en rango alto de sensibilidad y resistencia de enterococos. Hay frecuente administración inadecuada en: dosis e intervalos, ausencia de dosis de carga inicial, falta de monitoreo con concentraciones plasmáticas, inadecuada dosificación en presencia de insuficiencia renal o diálisis e, importantemente, mantención de uso en ausencia de clara documentación de su necesidad. Nuevos fármacos anti-estafilocócicos no han permitido un reemplazo generalizado de vancomicina por lo que ésta mantiene un importante rol en la medicina contemporánea. Conclusiones: Una comprensión de las fortalezas y debilidades del fármaco, así como de la cambiante epidemiología y propiedades microbiológicas de los patógenos relevantes, al igual que un uso prudente y selectivo, permitirán optimizar su uso y mantener su rol terapéutico en la medicina actual y futura.

Background: Vancomycin, standard parenteral therapy for Gram positive cocci resistant to traditional beta-lactam antibiotics (Staphylococcus aureus and coagulase negative staphylococci [CNS]) and Enterococcus spp, frequent agents of nosocomial infections, is extensively used empirically in that setting. However, its pharmacological weakness, narrow therapeutic margin and poorly predictable pharmacokinetics, make it a suboptimal drug according to contemporary criteria. Vancomycin is over utilized due to both, overestimation of bacterial infections and, in genuine cases, overestimation of the etiological role of these resistant cocci, either nosocomially or community acquired. New threats narrow further its therapeutic role: poorer outcomes in infections with higher vancomycin MIC and resistance by enterococci. It is frequently given at inappropriate dosage and intervals, failing to: give loading dose when recommended, measure blood levels, adjust dosing to changing renal function and continued use when not necessary. Newer anti staphylococcal drugs haven't replaced completely the role of vancomycin, which maintains its usefulness in contemporary medicine. Conclusion: Understanding the strengths and weaknesses of vancomycin, current epidemiology and microbiology of infections for which it may be indicated, as well as the proper administration and monitoring, together with a prudent and selective indication will allow to preserve its present and future utility in the changing medical scenario.

Cambios en las prescripciones y el consumo de antimicrobianos, luego de la implementación de recomendaciones de uso: experiencia en un hospital universitario / Changes in prescriptions and antibiotic consumption after the implementation of recommendations for use: experience in a university hospital

Resumen Introduccion: Actualmente cerca de la mitad de las prescripciones de antimicrobianos son inadecuadas, lo que aumenta la resistencia bacteriana. Tanto cefalosporinas como fluoroquinolonas se asocian con este fenomeno: aumento de bacterias productoras de β-lactamasas e infecciones por Clostridioides difficile, por lo que las agencias reguladoras buscan racionalizar su uso. Objetivo: Evaluar el efecto de recomendaciones para el uso adecuado de antimicrobianos en la proporcion de prescripciones inadecuadas de ceftriaxona y fluoroquinolonas. Metodologia: Se desarrollo un estudio de antes y despues, prospectivo e intervencional, que comparo la calidad y la cantidad de uso de ceftriaxona y fluoroquinolonas antes y despues de la implementacion de recomendaciones de uso para tratamientos de enfermedades infecciosas adquiridas en la comunidad. Los parametros medidos fueron: proporcion de prescripciones inadecuadas y DDD. Los datos se analizaron por medio del test de χ2, correccion de Fisher y test de Student. Resultados: Se evaluaron 206 pacientes, observandose una disminucion de 35% en las prescripciones inadecuadas, una reduccion del consumo de ceftriaxona y levofloxacina y un aumento significativo de la utilizacion de ampicilina/sulbactam. Conclusiones: La implementacion de recomendaciones de uso basadas en evidencia cientifica y susceptibilidad local, permitieron disminuir la proporcion de prescripciones inadecuadas y reducir el consumo de ceftriaxona y fluoroquinolonas.

Background: Nowadays about half of antibiotic prescriptions are inadequate, increasing bacterial resistance. Both cephalosporins and fluoroquinolones are associated with this phenomenon: increase of β-lactamase producing bacteria and Clostridioides difficile infections, which is why regulatory agencies seek to rationalize their use. Aim: To evaluate the effect of use recommendations on the proportion of inadequate prescriptions of ceftriaxone and fluoroquinolones. Methods: A prospective and interventional study was developed, comparing the quality and quantity of use of ceftriaxone and fluoroquinolones before and after the implementation of use recommendations for treatments of infectious diseases acquired at the community. The outcomes were: proportion of inadequate prescriptions and defined daily dose (DDD). Data were analyzed using the Chi-square test, Fisher's correction and Student's test. Results: A total of 206 patients were evaluated, a 35% decrease in inadequate prescriptions, a decline in the consumption of ceftriaxone and levofloxacin, and a significant increase in the use of ampicillin/ sulbactam was observed. Conclusions: The implementation of use recommendations based on scientific evidence and local susceptibility allowed to reduce the proportion of inadequate prescriptions and to reduce de consumption of ceftriaxone and fluoroquinolones.

Uso irracional e resistência a antimicrobianos em hospitais / Irrational use of antimicrobials and resistance in hospitals

Os antimicrobianos são uma das classes de medicamentos mais prescritas em todo o mundo. São utilizados para inibir ou combater o crescimento de determinados microrganismos, mas quando são indicados sem necessidade ou com imprecisão, facilitam o desenvolvimento da resistência bacteriana. Atualmente, os antimicrobianos estão entre os fármacos mais prescritos em hospitais, e uma das consequências mais importantes do uso indiscriminado é a resistência bacteriana. Visando contribuir com medidas que facilitem o controle do problema, este trabalho teve como objetivo, analisar o uso racional de antimicrobianos e a resistência bacteriana em hospitais, através de estudo bibliográfico. As causas que levam a não efetividade de tratamento com antimicrobiano se deve a diversos fatores como, prescrição inadequada, erro na dose, posologia e/ou tempo de tratamento, escolha inapropriada, entre outros. Medidas preventivas devem ser tomadas, como conscientização dos prescritores, determinação de protocolos e cursos de atualização, bem como uma maior fiscalização dos órgãos competentes e comissões atuante nesta área como a CCIH.

Antimicrobials are one of the most widely prescribed drug classes in the world. They are used to inhibit or combat the growth of some microorganisms, but if prescribed unnecessarily or inaccurately, they can help develop bacterial resistance. Currently, antimicrobials are among the most prescribed drugs in hospitals, and one of the most important consequences of its indiscriminate use is bacterial resistance. This paper aimed to analyze the rational use of antimicrobials and the bacterial resistance in hospitals by carrying out a bibliographic review. There are several factors that lead to non-effective antimicrobial treatments, among them unsuitable prescribing, dosage, treatment time, inappropriate choice of drugs. Preventive measures should be taken, such as awareness of prescribers, definition of protocols and refresher courses, as well as greater oversight of relevant bodies and committees acting in this area such as CCIH.

Uso racional de antimicrobianos en el departamento de medicina interna de un hospital universitario: resultados de una experiencia piloto / Rational use of antibiotics in the department of internal medicine from a university hospital: results of a pilot experience

Introduction: The programs of rational use of antibiotics are designed to optimize antimicrobial therapy and minimize the emergence of bacterial resistance. In order to optimize the use of antibiotics we implemented an educational program based on the application of a checklist criteria for the rational use of these drugs. Method: We performed a cohort study unpaired in the Department of Internal Medicine, during three months. We compared a prospective cohort (A) which used a checklist, with a retrospective cohort (B) in wich prescription was based on usual clinical practice. Results: We included 227 prescriptions of antibiotics. In cohort A compared to B, there was a higher proportion of switch to oral antibiotics agents and adjustment of the antimicrobial therapy to the susceptibility in the antibiogram and reduced use of associated antibiotics. Total antibiotic consumption was 117.7 DDD/100 bed-days (Defined Daily Doses). Consumption in cohorts A and B was 46.1 DDD/100 bed-days and 71.6 DDD/100 bed-days (reduction, 35.6%). There was also a reduction in consumption of ceftriaxone, ceftazidime, quinolones, vancomycin and carbapenems. Costs were reduced by 55%. There was no difference in the average hospital stay. Conclusions: The implementation of an educational strategy based on a checklist allowed the optimum use of antibiotics.

Introducción: Los programas de uso racional de antimicrobianos tienen la finalidad de optimizar la terapia antimicrobiana y minimizar la aparición de resistencia bacteriana. Con el objetivo de optimizar el uso de antimicrobianos se implementó un programa educativo basado en la aplicación de una lista de verificación (check list) conteniendo criterios establecidos de uso racional de estos fármacos. Método: Se realizó un estudio de cohortes no pareadas en el Departamento de Medicina Interna, durante tres meses. Se comparó una cohorte prospectiva (A) en que se aplicó la lista de verificación, con una cohorte retrospectiva (B) con prescripción de acuerdo a la práctica clínica habitual. Resultados: Se incluyeron 227 prescripciones de antimicrobianos. En la cohorte A, hubo mayor proporción de paso a vía oral y adecuación del antimicrobiano al antibiograma y menor uso de asociación de antimicrobianos, con respecto a la cohorte B. El consumo total de antimicrobianos fue de 117,7 DDD/100 días-cama (Dosis Diaria Definida). El consumo en las cohortes A y B fue de 46,1 DDD/100 días-cama y 71,6 DDD/100 días-cama respectivamente (reducción de un 35,6%). También hubo una reducción en el consumo de ceftriaxona, ceftazidima, quinolonas, vancomicina y carbapenem. Los costos se redujeron en 55%. No hubo diferencias en la estadía media hospitalaria. Conclusiones: La aplicación de una estrategia educativa basada en una lista de verificación permitió optimizar el uso de antimicrobianos.