JPJosé Cristian Plaza-Plaza

José Cristian Plaza-Plaza

*This is an algorithmically generated author record based on publicly available information.

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Previous Organizations / Institutes

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José Cristian Plaza-Plaza has a total of 45 co-authors. Here are the top co-authors by number of shared publications:


Latest Publications

  • Open Access

    Uso de plantas medicinales por adultos mayores en Centros de Atención Primaria de una Comuna de la Región Metropolitana de Chile

    by Raquel Bridi, Roberto Ebensperger, Paulette Trittini, Felipe Maturana, José Cristian Plaza-Plaza

    La implementación del uso de Fitoterapia en el sector público de salud está en línea con el preconizado por la OMS de realizar acciones encaminadas a la legitimación de las medicinas tradicionales y de las prácticas integradoras y complementarias5, demostrando que el uso de plantas medicinales es una alternativa terapéutica valiosa para la APS, dada su eficacia, bajo costo, facilidad de obtención y compatibilidad cultural con las personas6. Por otro lado, se debe considerar que los usuarios adultos mayores poseen una mayor vulnerabilidad a la ocurrencia de efectos adversos e interacciones medicamentosas7–9. Una encuesta realizada en el año 2000 en Latinoamérica informó que el 80% de la población adulto mayor recibe 3 o más medicamentos y el 90% recibe al menos uno10. En relación al uso de plantas medicinales prevalece la noción de que las plantas medicinales no presentan riesgos para la salud, sin embargo, muchas especies vegetales tienen descripción de interacciones potenciales con fármacos convencionales y/o cambios fisiopatológicos que pueden ser perjudiciales en el contexto de polifarmacia y enfermedades comunes en los adultos mayores11,12.


  • Open Access

    BC Clinical impact of medication reviews with follow‐up in cardiovascular older patients in primary care: A cluster‐randomized controlled trial

    by Francisco Martínez‐Mardones, Shalom I. Benrimoj, Antonio Ahumada‐Canale, Jose C. Plaza‐Plaza, Victoria Garcia‐Cardenas

    Aims: Cardiovascular diseases (CVD) are the primary cause of death in Chile. Pharmacist‐led medication review with follow‐up (MRF) has improved CVD risk factors control in Europe and North America. However, their healthcare systems differ from Chile's, precluding generalizability. This trial aimed to determine the effect of MRF on CVD risk factor control among older patients with polypharmacy attending public primary care centres in Chile.Methods: A cluster‐randomized controlled trial was conducted in 24 centres. Patients older than 65 years with moderate‐to‐high CVD risk, five or more medications, hypertension, type 2 diabetes or dyslipidaemia, received MRF in addition to usual care or usual care alone for 12 months. Primary outcome measures were clinical goal achievement for hypertension, type 2 diabetes and dyslipidaemia, as well as medication adherence, medication number and CVD risk score. Adjusted generalized estimating equations were used, with odds ratios (ORs) for binary measures and mean differences for continuous measures.Results: In total, 324 patients from 12 centres (174 MRF group, 150 usual care group, six centres each) received four pharmacist visits. Significant improvements were found for goal achievement in hypertension (OR 4.37, 95% confidence interval [CI] 2.54 to 7.51, P = .001), LDL cholesterol (OR 3.67, 95% CI 2.13 to 6.33, P = .001), type 2 diabetes (OR 6.97, 95% CI 3.69 to 13.2, P = .001), medication adherence (OR 6.60, 95% CI 1.36 to 31.9, P = .022), medications number (−0.86, 95% CI −1.14 to −0.58, P < .001) and CVD risk score (−2.27, 95% CI −2.84 to −1.69, P < .001).Conclusion: Pharmacist‐led medication review with follow‐up improved cardiovascular disease risk factor control and medication adherence. This study supports pharmacists' inclusion in primary care teams.


  • Medication review with follow-up for cardiovascular outcomes: a trial based cost–utility analysis

    by Antonio Ahumada-Canale, Constanza Vargas, Carlos Balmaceda, Francisco Martinez-Mardones, José Cristian Plaza-Plaza, Shalom Benrimoj, Victoria Garcia-Cardenas

    Aim: To assess the trial-based cost–effectiveness of medication review with follow-up compared with usual care in primary care. Materials & methods: A cluster randomized controlled trial included patients if they were independent older adults, receiving five or more prescriptions, with moderate or high cardiovascular risk. Costs were estimated from the public healthcare sector perspective, and health benefits were measured as quality-adjusted life years. Both of which were used to calculate the incremental cost–effectiveness ratio. Results: Twelve centers completed the study, six (146 patients) in the intervention group and six (145 patients) in the control group. The base-case analysis showed an incremental cost–effectiveness ratio of US$ (2019) 434.4/quality-adjusted life year (95% CI 64.20–996.03). Conclusion: The intervention was cost-effective in the public primary care setting.


  • Open Access

    Primary health care pharmacists and vision for community pharmacy and pharmacists in Chile

    by Francisco Martinez-Mardones, Antonio Ahumada-Canale, Loreto Gonzalez-Machuca, Jose C. Plaza-Plaza

    Pharmacy Practice is a free full-text journal with a scope on the practice of pharmacy. Pharmacy Practice covers pharmaceutical care, social pharmacy, pharmacy education, process and outcome research, health promotion and education, health informatics, pharmacoepidemiology


  • Open Access

    Primary health care pharmacists and vision for community pharmacy and pharmacists in Chile

    by Francisco Martinez-Mardones, Antonio Ahumada-Canale, Loreto Gonzalez-Machuca, Jose C. Plaza-Plaza

    The Chilean healthcare system is composed of public and private sectors, with most of the higher-income population being covered privately. Primary healthcare in the public system is provided in more than 2,500 public primary care centers of different sizes with assigned populations within territories. Private insurance companies have their own healthcare networks or buy services from individual health providers. Patients from the public system receive most medications free of charge in primary care pharmacies embedded in each care center. Private patients must purchase their medicines from community pharmacies. Some government policies subsidize part of the cost of medications, but original medicines remain as the most expensive of Latin America. Three chain pharmacies have more than 90% of the market share, and these pharmacies have negative public perception because of price collusion court sentences. A non-profit, municipal pharmacy model was developed but has limited implementation. Most privately owned independent and chain community pharmacies do not provide pharmaceutical services as there is no remuneration or cover by insurers. The limited number of publicly owned Municipal pharmacies could implement pharmaceutical services in community settings as they are non-profit establishments and have full-time pharmacists but are not resourced for these services. A limited number of pharmaceutical services are almost exclusively provided in public primary care, including medication reviews, pharmaceutical education, home visits and pharmacovigilance services, but several barriers to their implementation remain. A risk-based multimorbidity care model was implemented in 2020 for public primary care with additional employment of part-time pharmacists to provide services. We believe that this model will help pharmacists to optimize their time by prioritizing the much-needed clinical tasks. We propose within this multimorbidity care model that the more time-consuming services are provided to higher risk patients. Pharmacy prescribing i.e. amending or approving changes in medications in primary care for chronic conditions could also be useful for the health system, but pharmacists would require additional training. The landscape for pharmaceutical services for primary care in Chile is promising, but the integration with community pharmacies will not be possible until they are funded by public and private insurance, and the public perception of these establishments is improved.

  • Open Access

    Systematic Review and Meta‐Analysis of Medication Reviews Conducted by Pharmacists on Cardiovascular Diseases Risk Factors in Ambulatory Care

    by Francisco Martínez‐Mardones, Fernando Fernandez‐Llimos, Shalom I. Benrimoj, Antonio Ahumada‐Canale, José Cristian Plaza‐Plaza, Fernanda S. Tonin, Victoria Garcia‐Cardenas

    Background: Pharmacists‐led medication reviews ( MRs ) are claimed to be effective for the control of cardiovascular diseases; however, the evidence in the literature is conflicting. The main objective of this meta‐analysis was to analyze the impact of pharmacist‐led MRs on cardiovascular disease risk factors overall and in different ambulatory settings while exploring the effects of different components of MRs . Methods and Results: Searches were conducted in PubMed, Web of Science, Embase, the Cumulative Index to Nursing and Allied Health Literature, and the Cochrane Library Central Register of Controlled Trials database. Randomized and cluster randomized controlled trials of pharmacist‐led MRs compared with usual care were included. Settings were community pharmacies and ambulatory clinics. The classification used for MRs was the Pharmaceutical Care Network Europe as basic (type 1), intermediate (type 2), and advanced (type 3). Meta‐analyses in therapeutic goals used odds ratios to standardize the effect of each study, and for continuous data (eg, systolic blood pressure) raw differences were calculated using baseline and final values, with 95% CI s. Prediction intervals were calculated to account for heterogeneity. Sensitivity analyses were conducted to test the robustness of results. Meta‐analyses included 69 studies with a total of 11 644 patients. Sample demographic characteristics were similar between studies. MRs increased control of hypertension (odds ratio, 2.73; 95% prediction interval, 1.05–7.08), type 2 diabetes mellitus (odds ratio, 3.11; 95% prediction interval, 1.17–5.88), and high cholesterol (odds ratio, 1.91; 95% prediction interval, 1.05–3.46). In ambulatory clinics, MRs produced significant effects in control of diabetes mellitus and cholesterol. For community pharmacies, systolic blood pressure and low‐density lipoprotein values decreased significantly. Advanced MRs had larger effects than intermediate MRs in diabetes mellitus and dyslipidemia outcomes. Most intervention components had no significant effect on clinical outcomes and were often poorly described. CIs were significant in all analyses but prediction intervals were not in continuous clinical outcomes, with high heterogeneity present. Conclusions: Intermediate and advanced MRs provided by pharmacists may improve control of blood pressure, cholesterol, and type 2 diabetes mellitus, as statistically significant prediction intervals were found. However, most continuous clinical outcomes failed to achieve statistical significance, with high heterogeneity present, although positive trends and effect sizes were found. Studies should use a standardized method for MRs to diminish sources of these heterogeneities.


  • Economic evaluations of pharmacist-led medication review in outpatients with hypertension, type 2 diabetes mellitus, and dyslipidaemia: a systematic review

    by Antonio Ahumada-Canale, Camila Quirland, Francisco J. Martinez-Mardones, José Cristian Plaza-Plaza, Shalom Benrimoj, Victoria Garcia-Cardenas

    To evaluate the health economics evidence based on randomized controlled trials of pharmacist-led medication review in pharmacotherapy managed cardiovascular disease risk factors, specifically, hypertension, type-2 diabetes mellitus and dyslipidaemia in ambulatory settings and to provide recommendations for future evaluations.


  • Risk factors of early adverse drug reactions with phenytoin: A prospective inpatient cohort

    by Reinaldo Uribe-San-Martín, Ethel Ciampi, Wilhelm Uslar, Silvana Villagra, Jose Plaza, Jaime Godoy, Patricio Mellado


  • Open Access

    Pharmacokinetic Assessment of Vancomycin Loading Dose in Critically Ill Patients

    by Osvaldo Álvarez, Jose Cristian Plaza-Plaza, Manuel Ramirez, Alexis Peralta, Cristián A. Amador, Roberto Amador

    The vancomycin loading dose (LD) of 25 to 30 mg/kg is a frequently practiced strategy to achieve effective concentrations from the first-treatment dose. However, considering only the body weight for dosing might be inadequate in critically ill patients due to pharmacokinetics changes. We sought to assess achieving optimal trough serum levels of vancomycin and AUC 0–24 /MIC in the first 24 h of treatment by using an LD based on population pharmacokinetic parameters of critically ill patients. We performed a concurrent cohort study over 22 months of patients with severe sepsis who received intravenous vancomycin. The patients were treated with three different strategies to initiate vancomycin: without an LD (group A), with an LD of 25 to 30 mg/kg (group B), and with an LD based on population pharmacokinetic parameters of the critically ill patient (group C). An optimal trough serum concentration was achieved in 5, 9, and 83% of patients in groups A, B, and C, respectively. The number of patients that reached optimal AUC 0–24 was 2 of 18 (11%), 5 of 11 (46%), and 11 of 12 (92%) in groups A, B, and C, respectively. The statistical analysis for both parameters revealed significant differences in group C with respect to other groups. The administration of the LD calculated from population pharmacokinetic parameters from the beginning of therapy is a more efficient strategy to obtain adequate trough serum concentrations and AUC 0–24 /MIC in critical patients.


  • Genetic and clinical biomarkers of tocilizumab response in patients with rheumatoid arthritis

    by Mar Maldonado-Montoro, Marisa Cañadas-Garre, Alfonso González-Utrilla, José Cristian Plaza-Plaza, Miguel Ÿngel Calleja-Hernández