1,720,987 research outputs found
Patterns of readmission among the elderly after hepatopancreatobiliary surgery
No full textBackground: The objective of this study was to examine risk factors and outcomes of hospital readmission following complex hepatopancreatobiliary (HPB) surgery among the elderly. Methods: The Nationwide Readmissions Database was queried for patients ≥ 60 years who underwent HPB surgery during 2010–2015. Results: The incidence of 30- and 90-day readmission was similar among patients 60–74 vs. ≥75 (P > 0.05). Patients age 60–74 years with ≥2 comorbidities had an increased odds of 30-day (OR 1.13, p = 0.021) and 90-day (OR 1.13, p = 0.005) readmission. Patients ≥75 years with ≥2 comorbidities had the highest in-hospital mortality (5%) whereas patients 60–74 years with 0 or 1 comorbidity had the lowest in-hospital mortality on readmission (3%). Conclusion: Following an HPB procedure, roughly 1 in 7 elderly patients were readmitted within 30 days and 1 in 4 patients within 90 days. Elderly patients with multiple comorbidities were more likely to be readmitted at non-index hospitals
Trends in centralization of surgical care and compliance with National Cancer Center Network guidelines for resected cholangiocarcinoma
No full textBackground: A retrospective study was performed to characterize trends in centralization of care and compliance with National Comprehensive Cancer Network (NCCN) guidelines for resected cholangiocarcinoma (CCA), and their impact on overall survival (OS). Methods: Using the National Cancer Database (NCDB) 2004–2015 we identified patients undergoing resection for CCA. Receiver Operating Characteristic (ROC) analyses identified time periods and hospital volume groups for comparison. Propensity score matching provided case-mix adjusted patient cohorts. Cox hazard analysis identified risk factors for OS. Results: Among the 40,338 patients undergoing resection for CCA, the proportion of patients undergoing surgery at high volume hospitals increased over time (25%–44%, p < 0.001), while the proportion of patients undergoing surgery at low volume hospitals decreased (30%–15%, p < 0.001). Using ROC analyses, a hospital volume of 14 operations/year was the most sensitive and specific value associated with mortality. Surgery at high volume hospitals [HR] = 0.92, 95% CI: 0.88–0.97, p < 0.001) and receipt of care compliant with NCCN guidelines (HR = 0.87, 95% CI: 0.83–0.91, p < 0.001) were independently associated with improved OS. Conclusions: Both centralization of surgery for CCA to high volume hospitals and increased compliance with NCCN guidelines were associated with significant improvements in overall survival
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Index versus Non-index Readmission After Hepato-Pancreato-Biliary Surgery: Where Do Patients Go to Be Readmitted?
No full textIntroduction: The Center for Medicare and Medicaid Services (CMS) has identified readmission as an important quality metric. With an increased emphasis on regionalization of complex hepato-pancreato-biliary (HPB) surgery to high-volume centers, care of readmitted HPB patients may be fragmented if readmission occurs at a non-index hospital. We sought to define the proportion of HPB readmissions, as well as evaluate outcomes, that occur at an index versus non-index hospitals and to identify factors associated with non-index hospital readmission. Methods: The National Readmissions Database (NRD) was used to identify patients who underwent major HPB surgery between 2010 and 2015. Factors associated with readmission at 30 and 90 days at index versus non-index hospitals were analyzed. Differences in mortality and complications were analyzed among patients readmitted to index versus non-index hospitals. Results: A total of 49,080 patients underwent HPB surgery (liver n = 27,081, 55%; pancreas n = 14,787, 30%; biliary n = 7212, 15%). Overall, 6643 (14%) and 11,709 (24%) patients were readmitted within 30 and 90 days, respectively. Among all first readmissions, 18 and 21% were to a non-index hospital within the first 30 and 90 days, respectively. On multivariable analysis, factors associated with readmission to a non-index hospital included age (OR 1.19, 95% CI 1.05, 1.34), pancreatic cancer (OR 1.40, 95% CI 1.14, 1.34) and ≥ 3 comorbidities (OR 1.34, 95% CI 1.10, 1.63), while procedures on the pancreas (OR 0.69, 95% CI 0.61, 0.80), private insurance (OR 0.77, 95% CI 0.68, 0.87), initial admission at a large hospital (OR 0.77, 95% CI 0.65, 0.91), and initial admission length of stay > 7 days (OR 0.77, 95% CI 0.69, 0.86) were associated with decreased odds of a non-index hospital readmission (all p < 0.05). Patients readmitted to a non-index hospital had higher inpatient mortality (3.7 vs. 2.7%, p = 0.010). Conclusions: Roughly 1 in 5 patients were readmitted to a non-index hospital where the initial HPB operation had not taken place. Readmission to a non-index hospital was associated with higher overall in-hospital mortality. The impact of regionalization of HPB care relative to site of subsequent readmission may have important implications for patients
Synergistic Effects of Perioperative Complications on 30-Day Mortality Following Hepatopancreatic Surgery
No full textBackground: Data on the interaction effect of multiple concurrent postoperative complications relative to the risk of short-term mortality following hepatopancreatic surgery have not been reported. The objective of the current study was to define the interaction effect of postoperative complications among patients undergoing HP surgery on 30-day mortality. Methods: Using the ACS-NSQIP Procedure Targeted Participant Use Data File, patients who underwent HP surgery between 2014 and 2016 were identified. Hazard ratios (HRs) for 30-day mortality were estimated using Cox proportional hazard models. Two-way interaction effects assessing combinations of complications relative to 30-day mortality were calculated using the relative excess risk due to interaction (RERI) in separate adjusted Cox models. Results: Among 26,824 patients, 10,886 (40.5%) experienced at least one complication. Mortality was higher among patients who experienced at least one complication versus patients who did not experience a complication (3.0 vs 0.1%, p < 0.001). The most common complications were blood transfusion (16.9%, n = 4519), organ space infection (12.2%, n = 3273), and sepsis/septic shock (8.2%, n = 2205). Combinations associated with additive effect on mortality included transfusion + renal dysfunction (RERI 12.3, 95% CI 5.2–19.4), pulmonary dysfunction + renal dysfunction (RERI 60.9, 95% CI 38.6–83.3), pulmonary dysfunction + cardiovascular complication (RERI 144.1, 95% CI 89.3–199.0), and sepsis/septic shock + renal dysfunction (RERI 11.5, 95% CI 4.4–18.7). Conclusion: Both the number and specific type of complication impacted the incidence of postoperative mortality among patients undergoing HP surgery. Certain complications interacted in a synergistic manner, leading to a greater than expected increase in the risk of short-term mortality
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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