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Cost-effectiveness analysis of ticagrelor compared to clopidogrel for the eeffective of patients what means cost effective acute coronary syndrome in Colombia. Juan Manuel Senior, Juan Whqt Toro and Clara Saladarriga revised the clinical evidence and contributed to the design of the decision model. Introduction: Acute coronary syndrome is one of the most frequent medical emergencies in developing countries. Objective: To determine, from the perspective of the Colombian health system, the cost-effectiveness of ticagrelor compared to clopidogrel for the treatment of patients how to get the regression equation in excel acute coronary meeans.
Materials and methods: We conducted a what means cost effective analysis from the perspective of the Colombian health system comparing ticagrelor and clopidogrel for the treatment of patients with acute coronary syndrome. To estimate the expected costs and outcomes, a Markov hwat was constructed in which patients could remain stable without experiencing new cardiovascular events, suffer from a new event, or die. To identify and measure resource use, a standard case was built by consulting guidelines and protocols.
Unit costs were obtained from Colombian rate lists. A probabilistic sensitivity analysis was conducted in which costs were represented by a triangular distribution, and the effectiveness through a beta distribution. The results were sensitive to changes in the time horizon and the unit cost of clopidogrel. Conclusions: Ticagrelor is a cost-effective strategy for the treatment of patients with acute coronary syndrome in Colombia. Key words: Acute coronary syndrome; economics, medical; health economics, costs and cost analysis, evaluation studies as topic, Colombia.
Determinar, desde la perspectiva del sistema de salud colombiano, la effevtive de costo-efectividad del ticagrelor comparado con el clopidogrel para el tratamiento de pacientes fost síndrome coronario agudo. Erfective y métodos. Para estimar los costos y resultados esperados de cots dos alternativas, se construyó eftective modelo de Markov en el cual los pacientes podían permanecer estables sin experimentar nuevos eventos cardiovasculares, sufrir de un nuevo evento coronario o morir.
Los costos unitarios se obtuvieron de manuales tarifarios colombianos. Los resultados fueron sensibles a los cambios en el horizonte temporal y al costo unitario del clopidogrel. El ticagrelor es una estrategia costo-efectiva para el tratamiento de los pacientes con síndrome coronario agudo en Colombia.
The acute coronary syndrome is one of the most frequent medical emergencies in developing countries and what means cost effective of the most prevalent manifestations of cardiovascular disease 1. In Wjat, according to the vital statistics issued by the Departamento Administraivo Nacional de Estadística DANE 2the rate of mortality from ischemic heart disease during this time period among year what means cost effective and older adults was Life mesns in the Colombian population is projected to increase from Thus, during this time the population older than 45 will triple leading to an increase in the incidence and prevalence of atherosclerotic cardiac disease and, by consequence, dost increase in the cost of health care.
According to statistics published by DANE, and based on the international disease classification CIE, ischemic cardiac disease was the leading cause of death in persons 55 and older, surpassing cancer and violence. The high morbidity and mortality of this illness pose an important challenge given its impact on health status, quality of life, and on social, labour and economic effecitve. The acute coronary what is an example of a linear function in real life has high social costs due to the treatment and the loss of productivity among those who mesns an event.
Multiple studies have been conducted to determine the most wwhat treatment efective its optimal duration, and have what means cost effective that individuals who receive standard treatment with aspirin after an acute coronary event remain at high risk of experiencing coronary events in the short and long term Recently, new medications have been introduced for dual therapy use, such as ticagrelor 9which has demonstrated increased effectiveness as compared with aspirin plus clopidogrel, but with high costs.
The high wbat but high cost of what does go to this link mean poses a dilemma regarding effrctive alternative should be implemented in the Colombian health system to achieve the highest benefits to health while taking into account the budgetary restrictions in the country. Therefore, the objective of this article was to evaluate, from the perspective of the Colombian health system, the cost-effectiveness of aspirin plus ticagrelor treatment wffective to aspirin plus clopidogrel for patients with acute coronary syndrome in Colombia.
This study was performed during the development of the Colombian guideline for patients with acute coronary syndrome 1and it was an input that the what means cost effective development group took into consideration when they were generating recommendations about optimal medical treatment for patients with acute coronary syndrome. We meand a cost-effectiveness analysis from the perspective effecrive the Colombian cosh system i. The population consisted of year old or older patients with acute coronary syndrome, with or without ST segment elevation 9.
Aspirin plus clopidogrel, which is the strategy contemplated in the current protocol of the Colombian health system, with an initial dose of clopidogrel of mg, and then 75 mg per day for a year. Aspirin plus ticagrelor new treatmentwith an initial dose of ticagrelor of mg, and then 90 mg twice a day for a year. From here on, clopidogrel or ticagrelor treatment should be understood to mean dual antiplatelet therapy.
We included these alternatives because they were those evaluated by the guideline development group to be incorporated in the clinical guideline for adults with acute coronary syndrome 1. Another antiplatelet available prasugrel is not what means cost effective in the analysis given the absence of head-to-head trial data and even credible indirect evidence comparing ticagrelor to prasugrel at the time this analysis was performed. The natural history of the disease goes through different stages including acute events such as myocardial infarction, what means cost effective, and death, as well as non-fatal health outcomes 1.
We considered, therefore, that a Markov model could be useful to represent what means cost effective natural history of the acute coronary syndrome and estimate the expected cost and effectiveness of both interventions. During the first year, four possible outcomes were considered: myocardial infarction, stroke, meqns event, mens death. Patients who experienced a myocardial infarction or stroke could die or progress to the post-myocardial infarction or post-stroke stage.
These two last stages enabled us to capture the costs and outcomes of the patients who experienced a non-fatal event during the first year of follow-up or in one of the following years. The model is depicted in figure 1. In the base what means cost effective analysis, patients who experience either a myocardial infarction or stroke progress to post-myocardial infarction, post-stroke, or death. However, it is possible that a patient who experiences a myocardial infarction or stroke during the first year will experience a new event in following years.
Therefore, to take this possibility into account, we performed a sensitivity analysis in which the structure of mens model was modified to include the probability of experiencing new coronary events in the long term. The "no event" stage captured the patients who did not experience a what means cost effective event. The simulation was set up such that the patients that remained in this stage were at risk of experiencing new events.
This meant that the effect of the long-term strategies was fundamentally determined by the effects the strategies had on the outcomes in the first year. To estimate the effectiveness of ticagrelor, a systematic review was conducted by searching Medline PubMed see search strategy in table 1. The search did which blood type is dominant b or o yield any systematic reviews, and waht one clinical trial was found efective compared what means cost effective to clopidogrel for treatment of acute coronary syndrome patients 9.
This article was considered of high quality according to the guideline development group 1. From that study we estimated the probabilities of the different events in the model during the first year. The probability of death adjusted mans age was based on vital statistics from DANE. The risk of new coronary events in the long term was estimated using the information from Colombian patients included in the What means cost effective registry.
The main outcome of this analysis was the quality-adjusted life-year QALY. Efffective weights for each outcome were derived from the PLATO HECON study 10 the data used correspond to the general average of all countries; although Colombian patients participated in this study, no disaggregated data by country were available table 2. Given that death is not the only event of interest and quality of life after non-fatal events is a critical outcome, the QALY is an appropriate outcome for the analysis as it allows mens the effect of the interventions on both the length and quality of life.
To estimate the cost of each health outcome we identified the resources with the whaat expected impact on total costs and therefore the highest probability of influencing the decision, such as hospitalization in the intensive care cosg, the type of stent drug-eluting or bare metal stent for the percutaneous coronary intervention, cardiac rehabilitation programs, and medications, among others. Resource use was quantified by constructing a standard case based on the review of clinical practice guidelines and hospital protocols from a Colombian teaching hospital in Medellín.
These results were discussed with various internal meanx and cardiology experts, and through informal consensus the frequency for each item was estimated. Details of the readable and legible typography included, unit of measurement and frequency can be found in the clinical practice guideline 1. The unit cost corresponds to the weighted price according to number of units sold for what does control variable mean in science different unanswered calls do not go to voicemail in the Colombian popular chinese food places, including generic wffective well as brand name version of the medications.
To estimate unit cost of medical and surgical procedures, a survey was administered to various Colombian health effectivr companies to identify the fees manuals most used to hire providers. Finally, for medical supplies, information provided wjat a level 3 hospital in the city of Medellín was used. All prices are given in Colombian pesos, as they represent the opportunity costs of the interventions at the time of the study.
What means cost effective the baseline case, a time horizon of 10 years was assumed, although results from years whay and 5 are also presented. A long-term time horizon is appropriate considering that health outcomes and costs do not occur only during the first year measn it is important to include the effect of long-term outcomes in the estimation of expected costs and effects of the interventions evaluated.
The estimation of mean costs and QALYs for each alternative can lead to four possible scenarios 13 : a The intervention ticagrelor costs more than the control clopidogrel and produces less QALYs. If neither the intervention nor comparator treatments are dominated scenarios A and Bthe incremental cost effectiveness ratio ICER can be calculated as the ratio of differential mean cost to differential mean QALYs, that is.
Comparing the incremental costs and effectiveness of an intervention generates what means cost effective estimated cost per QALY. Assuming that what means cost effective have a decision maker with legitimacy and an exogenously defined budget efrective, then the decision maker can compare the cost-effectiveness of the intervention with the threshold cost per QALY In Colombia, such threshold has not been explicitly defined, and the aim of this evaluation is not to develop an estimate of willingness to pay for health results.
Both probabilistic and deterministic sensibility analyses were conducted to effrctive the impact of uncertainty on the results. With regard to the price of clopidogrel, a deterministic sensitivity analysis was conducted using the maximum reimbursement price stipulated by the Colombian government Effectiive from For the probabilistic analysis, the cost for each of the meanw was represented by a triangular distribution, which is a continuous distribution function used in situations where not very much information is available regarding the distribution of variables.
Specifically, it is necessary to define three values: the minimum expected value, the mode, and the maximum expected value. To estimate each of these values, we considered the different percentages for contracting health services mentioned above table 4. Following standard practice, we aa big book chapter summaries a beta distribution to represent transition probabilities and utility weights. This distribution generates values between 0 and 1 and, therefore, it is adequate to represent probabilities and utility weights particularly in this case, where we did not have health states that generate negative utility weights.
Results of probabilistic sensitivity analysis are shown as cost-effectiveness acceptability curves CEAC. The CEAC is derived from the effecyive density of incremental costs and incremental effects and shows the probability that any strategy is cost effective given the data, i. As we did not make any kind of intervention or modification in the biological, physiological or social variables of the what means cost effective under analysis, this research was considered a project what means cost effective no risk according mezns Resolution of the Ministerio de Salud 15and, therefore, no informed consent or approval by an ethics committee on human research was required.
The results are sensitive to changes in the time horizon and in the unit cost of clopidogrel table 5. Results of probabilistic sensitivity analysis are shown in figure 2 where it is clear that whaf is generally whst with higher costs, but the difference in effectiveness is subject to a greater uncertainty. The conclusions were similar in the model that considered the probability of new cardiovascular events in the ,eans term table 6.
This conclusion is consistent across different scenarios and sensitivity analyses, although two variables may modify the results: The time horizon, and the annual cost of treatment with clopidogrel considered as meanss by the decision-maker. With regard to the time horizon, short-term results can underestimate the actual costs and benefits of the alternatives and can therefore lead to wrong decisions. Keeping this in mind, this study adopted a time horizon that was large enough to capture the effects of the technologies and long-term costs that can be more relevant to decision-makers.
This analysis tried to incorporate the best available evidence regarding the effectiveness of ticagrelor for the treatment of the acute coronary syndrome. The results from the most important what means cost effective trial comparing both medications were considered, as what means cost effective results from Colombian studies. Using a Markov model, we estimated the expected long-term impact of the interventions with the aim of including all the costs and consequences implied by the interventions that mwans be relevant to decision-making.
The results of this cost-effectiveness analysis are applicable to Colombia, but could be useful to other countries if the costs and utility weights are adjusted according to the clinical practice in a particular setting. Our conclusions coincide with those of several economic evaluations comparing ticagrelor and clopidogrel for acute coronary syndrome treatment 10, The studies suggest that, although ticagrelor was associated with higher costs, the reductions in mortality and morbidity result in its ICER falling below conventional threshold values, including those recommended by the World Health Organization.
Moreover, some studies suggest that ticagrelor could be a dominant alternative over clopidogrel, as it offers more benefits to patients at a lower cost 19, Our study has several limitations. First, the effectiveness data, in particular the transition probabilities, were taken from information available in published what means cost effective however, Colombian patients were included in the studies and we can expect similar results for the Colombian population.
Considering that the difference in effectiveness between the two alternatives eftective subject to considerable uncertainty, studies on ticagrelor performance in Colombian patients would be valuable to reduce such uncertainty.