Identification of potential clinically significant drug interactions in HIV-infected patients: a comprehensive therapeutic approach.

OBJECTIVES: The aim of the study was to determine the prevalence of potential clinically significant drug interactions (CSDIs) in HIV-positive individuals and to identify associated risk factors. METHODS: A cross-sectional study was conducted including all HIV-infected out-patients attending the Pharmacy Service of a regional reference hospital in Murcia, south-eastern Spain. The complete treatment was screened for possible CSDIs using the Spanish College of Pharmacists' online software resource, bot. Additionally, the severity level of the CSDIs involving antiretroviral (ARV) drugs was compared with that established in the specific antiretroviral database InteraccionesHIV.com. Multivariate logistic regression was used to identify associated risk factors. RESULTS: Two hundred and sixty-eight patients were included in the study. A total of 292 potential drug interactions were identified, of which 102 (34.9%) were CSDIs, of which 52.9% involved ARV drugs. Seven therapeutic drug classes were involved in 75% of CSDIs (protease inhibitors, benzodiazepines, nonsteroidal anti-inflammatory drugs, nonnucleoside reverse transcriptase inhibitors, corticosteroids, antithrombotics and proton pump inhibitors). Factors independently associated with CSDIs were treatment with more than five drugs [odds ratio (OR) 15.1; 95% confidence interval (CI) 6.3-36.2], and treatment with a protease inhibitor (OR 5.3; 95% CI 2.4-11.74). CONCLUSIONS: The findings of this study suggest that the prevalence of clinically relevant drug-drug interactions is high in HIV-infected patients, and could represent a major health problem. Awareness, recognition and management of drug interactions are important in optimizing the pharmaceutical care of HIV-infected patients and helping to prevent adverse events and/or loss of efficacy of the drugs administered.

[Risk prescription associated to treatment at home of the elderly patient when admitted to the hospital]. / Prescripciones de riesgo asociadas al tratamiento domiciliario del paciente anciano al ingreso hospitalario.

OBJECTIVE: To determine the prevalence, the incidence of error, and the potential harm associated to particular prescriptions identified as a risk for medication error in the home treatment of elderly patients admitted to the hospital, as well as factors associated to their occurrence. MATERIAL AND METHODS: Cross-sectional, descriptive study. Patients aged 65 years and older, being admitted to the hospital from the emergency department in the last quarter of 2009. The SPSS software version 15.0 was used for the statistical analysis. RESULTS: 324 patients were included in the study. 1,176 (47%) prescriptions were identified as risk prescriptions in 91% of the patients. The most relevant risk prescription was prescription of high-risk medications (51.5% patients) that accounted for an error incidence of 88/100 patients with high-risk medications, being severe in 68 patients. Factors associated to the occurrence of moderate/high risk error due to risk prescriptions were suffering from a chronic respiratory illness, diabetes or polymedication. CONCLUSIONS: Actions aimed at decreasing the errors due to high risk medications should be prioritized.

Objetivo: Determinar la prevalencia, la incidencia de error y el daño potencial asociado a determinadas prescripciones señaladas como de riesgo de error de medicación en el tratamiento domiciliario de pacientes ancianos que ingresan en el hospital, así como los factores asociados a su aparición. Material y métodos: Estudio transversal descriptivo. Se incluyeron los pacientes de edad igual o mayor a 65 años que ingresaron en el hospital desde el servicio de urgencias durante el último trimestre de 2009.Para el análisis estadístico se utilizó el programa SPSSv15.0. Resultados: Se incluyeron en el estudio 324 pacientes. Se identificaron 1176 (47%) prescripciones de riesgo en el 91% de los pacientes. La prescripción de riesgo más relevante fue la prescripción de medicamentos de alto riesgo (51.5% pacientes) que presentó una incidencia de error de 88/100 pacientes con medicamentos de alto riesgo, de los cuales en 68 pacientes fue grave. Los factores asociados a la presencia de error grave/moderado ocasionado por prescripciones de riesgo fueron tener enfermedad respiratoria crónica o diabetes y la polimedicación. Conclusiones: Se deben priorizar actuaciones dirigidas a disminuir errores por medicamentos de alto riesgo.

[Analysis of the drug interactions associated to domiciliary drug therapy in elderly hospitalized patients]. / Análisis de las interacciones medicamentosas asociadas a la farmacoterapia domiciliaria en pacientes ancianos hospitalizados.

OBJECTIVE: To determine the prevalence of potentially relevant drug-drug interactions associated with chronic treatment of elderly patients over 64-years of age on hospital admission and the factors associated with an increased presence of these. SUBJECTS AND METHODS: Cross-sectional observational study in a hospital referral area. All patients aged 65 or over admitted to the hospital in the last three months in 2009 were included. Based on the drug database of the General Council of Colleges of Pharmacy (BOT), drug-drug interactions and their potential clinical relevance were identified. To identify the variables associated with a higher prevalence of drug-drug interactions, analyses of correlation and of univariable linear regression and uni-and multivariable logistic regression analyses were performed using the SPSS, version 15.0. RESULTS: We analyzed the drug prescription data of 382 patients, whose mean age was 7.7 years. A total of 45.3% of patients had comorbidities and 78.8% had taken 5 or more drugs. We identified 272 clinically relevant drug-drug interactions that involved 159 patients (41.6%). Seven pharmacological groups accounted for 80.6% of the drug-drug interactions. The variables that had a statistically significant association to a higher prevalence of relevant interactions were polypharmacy, respiratory insufficiency, and treatment with proton-pump inhibitors, vitamin K antagonists, diuretics or anti-platelet drugs. CONCLUSIONS: A high prevalence of relevant drug-drug interactions was found in elderly hospitalized patients. Our findings suggest that prevention strategies should be implemented to avoid their associated adverse events, especially in high risk populations.

[Nutritional assessment at the time of hospital-admission: study initiation among different methodologies]. / Valoración nutricional al ingreso hospitalario: iniciación al estudio entre distintas metodologías.

BACKGROUND AND OBJECTIVES: The elevated prevalence figures of hyponutrition in hospitalized patients--near 40%--is an issue of concern. This allows deducing that early identification of malnourished, or at risk for hyponutrition, patients by means of effective nutritional assessment methods may represent an essential tool for nutritional planning. The aim of this study was applying to a same group of patients different nutritional assessment methods (objective and subjective) at the time of hospital admission in order to assess the degree of effectiveness for its clinical application. SETTING, PATIENTS AND INTERVENTIONS: A prospective randomized study is designed, in which 50 admitted patients of our hospital are included between October 1st and December 31st of 2004, 9 of them being rejected for laboratory errors. During the first 3 days of hospital staying, anthropometrics (weight, height, arm circumference, and tricipital fold measure), biochemistry (full blood count, albumin, pre-albumin, retinol-bound protein, transferrin, and cholesterol), two nutritional assessment questionnaires (Global Subjective Assessment (GSA) and Mini Nutritional Assessment (MNA). RESULTS: Thechi-squared2 test has been applied to compare the results obtained from the different objective methods, separately and globally, with the MNA and GSA questionnaires, establishing the following anthropometrical comparisons: anthropometrics/MNA, Biochemistry/MNA, Chang/MNA, anthropometrics/GSA, Biochemistry/GSA, Chang/GSA, and MNA/GSA. Statistical significance has been set at p < 0.05. Statistical analysis has been done with the SPSS v.11 software. We have not observed a statistical significance between any of the three objective parameters studied: biochemistry, anthropometrics and immunology separately considered in the two nutritional assessment questionnaires. However, the significance is positive when we relate the results obtained by the Chang method, which comprises the three types of objective parameters, with those from the MNA and GSA. A statistical significance was also reached when relating both subjective methods between each other: MNA and GSA. CONCLUSIONS: Both the GSA and MNA represent a good indicator to determine high-risk patients for developing complications attributable to hyponutrition. We can attribute them a predictive power similar to that of objective data considered as a whole.