A 10-Year Analysis
نویسنده
چکیده
Background—The United Kingdom Heart Valve Registry (UKHVR) has recently completed collecting information on 52 659 heart valve replacements (in 47 718 patients) performed during the period 1986 to 1995 in the whole of the United Kingdom. Information stored in the UKHVR’s computer database was used for this study. Factors affecting the time from first prosthesis to first redo prosthesis were analyzed and provided useful predictive information. The association between prosthesis-induced local pathological processes and redo valve size was investigated. Methods and Results—This is a retrospective study of 43 301 patients (from among 47 718 in the database) undergoing single-site replacement of a diseased native mitral or aortic valve over a 10-year period from January 1986 to December 1995 in the United Kingdom. Of these patients, 1051 (2.43%) went on to have a first redo heart valve replacement. Valve survival analysis (Cox regression and Kaplan-Meier curves) was used to study the natural progression to the first redo heart valve replacement. Female sex and having a replacement at the aortic rather than the mitral position were both associated with a longer interval to the first redo operation. Regression analysis showed the size of the redo valve to be influenced by the interoperative time. This effect was more pronounced at the mitral position. Conclusions—Females and patients having an aortic valve replacement exhibit a longer interval to the first redo operation than do males and patients having mitral valve replacements, respectively. The time from the first replacement to the first redo operation significantly affects the size of the first redo valve. (Circulation. 1999;99:655-658.)
منابع مشابه
Evaluating E-commerce Efficiency in Provinces of Iran with Data Envelopment Analysis Approach
This paper presents a model for assessing the efficiency of e-commerce in the provinces of IRAN with data envelopment analysis (DEA). For this purpose, first, we assess the factors that affect to growth and use of e-commerce in Iran, then to show the efficiency of IRAN's provinces on e-commerce, data analysis model applied. Results show the average efficiency in IRAN in year 2016 compared to ye...
متن کاملSite Regression Biplot Analysis for Matching New Improved Lentil Genotypes into Target Environments
Abstract The evaluation of the yield stability of genotypes and environment is of prime concern to plant breeders. Therefore, a comprehensive analysis of the structure of the GE interaction is needed. The objective of this investigation was to evaluate the use of sites regression (SREG) GGE methodology to stratify the pe × environment (GE) interaction in lentil. Yield data of 10 genotypes of le...
متن کاملAntibiotic resistance status and its costs in hematological patients: A two-year analysis
Background: Most frequently, empirical antibiotic therapy is immediately administered for patients with febrile neutropenia (FN). In this study, its aim was to assess the antibiotic resistance status and the cost of antibacterial agents in FN patients associated with hematological malignancies. Methods: The cost of antibacterial agents used in FN episodes in patients with hematologic neoplasms ...
متن کاملAnalysis of statistics and anomalies of rainfall in Iran during the Warm period(1951-2010)
Investigating the variability of the spatial-temporal pattern of rainfall, which can lead to climate change, due to its strong impact, is of interest to various scientists. For this purpose, after receiving the daily precipitation data of 27 stations for the period of 60 years (2010-1951), its quality and the total monthly precipitation and statistics necessary for the continuation of the resea...
متن کامل