Predictors of Mortality Up to 1 Year After Emergency Major Abdominal Surgery in Older Adults

ackground The number of older patients who undergo emergent major abdominal procedures is expected to increase yet little is known about mortality beyond 30 days after surgery. Objective Identify factors associated with mortality among older patients at 30, 180 and 365 days after emergency major abdominal surgery. Design A retrospective study of the Health and Retirement Study (HRS) linked to Medicare Claims from 2000-2010. Setting N/A Participants Medicare beneficiaries > 65.5 years enrolled in the Health and Retirement Study (HRS) from 2000-2010, with at least one urgent/emergent major abdominal surgery and a core interview from the HRS within 3 years prior to surgery. Main Outcomes and Measures Survival analysis was used to describe all-cause mortality at 30, 180 and 365 days after surgery. Complementary log-log regression was used to identify patient characteristics and postoperative events associated with worse survival. Results 400 patients had one of the urgent/emergent surgeries of interest. Of these 24% were > 85 years; 50% had coronary artery disease, 48% had cancer, and 33% had congestive heart failure; and 37% experienced a postoperative complication. Postoperative mortality was 20%, 31% and 34% at 30, 180 days and 365 days. Among those > 85 years, 50% were dead one year after surgery. After multivariate adjustment including postoperative complications, dementia (Hazard ratio (HR) 2.02, 95%CI 1.24-3.31), hospitalization within 6 months before surgery (HR 1.63, 95% CI 1.12-2.28) and complications (HR 3.45, 95%CI (2.32-5.13) were independently associated with worse one-year survival. Conclusion Overall mortality is high up to one year after surgery in many older patients undergoing emergency major abdominal surgery. The occurrence of a complication is the clinical factor most strongly associated with worse survival

Factors Associated with Racial Differences in Deaths among Nursing Home Residents with COVID-19 Infection in the US

Importance: It is important to understand differences in coronavirus disease 2019 (COVID-19) deaths by nursing home racial composition and the potential reasons for these differences so that limited resources can be distributed equitably.Objective: To describe differences in the number of COVID-19 deaths by nursing home racial composition and examine the factors associated with these differences.Design, Setting, and Participants: This cross-sectional study of 13 312 nursing homes in the US used the Nursing Home COVID-19 Public File from the Centers for Medicare and Medicaid Services, which contains COVID-19 cases and deaths among nursing home residents as self-reported by nursing homes beginning between January 1, 2020, and May 24, 2020, and ending on September 13, 2020. Data were analyzed from July 28 to December 18, 2020. Exposures: Confirmed or suspected COVID-19 infection. Confirmed cases were defined as COVID-19 infection confirmed by a diagnostic laboratory test. Suspected cases were defined as signs and/or symptoms of COVID-19 infection or patient-specific transmission-based precautions for COVID-19 infection.Main Outcomes and Measures: Deaths associated with COVID-19 among nursing home residents. Death counts were compared by nursing home racial composition, which was measured as the proportion of White residents.Results: Among 13312 nursing homes included in the study, the overall mean (SD) age of residents was 79.5 (6.7) years. A total of 51606 COVID-19-associated deaths among residents were reported, with a mean (SD) of 3.9 (8.0) deaths per facility. The mean (SD) number of deaths in nursing homes with the lowest proportion of White residents (quintile 1) vs nursing homes with the highest proportions of White residents (quintile 5) were 5.6 (9.2) and 1.7 (4.8), respectively. Facilities in quintile 1 experienced a mean (SE) of 3.9 (0.2) more deaths than those in quintile 5, representing a 3.3-fold higher number of deaths in quintile 1 compared with quintile 5. Adjustment for the number of certified beds reduced the mean (SE) difference between these 2 nursing home groups to 2.2 (0.2) deaths. Controlling for case mix measures and other nursing home characteristics did not modify this association. Adjustment for county-level COVID-19 prevalence further reduced the mean (SE) difference to 1.0 (0.2) death.Conclusions and Relevance: In this study, nursing homes with the highest proportions of non-White residents experienced COVID-19 death counts that were 3.3-fold higher than those of facilities with the highest proportions of White residents. These differences were associated with factors such as larger nursing home size and higher infection burden in counties in which nursing homes with high proportions of non-White residents were located. Focusing limited available resources on facilities with high proportions of non-White residents is needed to support nursing homes during potential future outbreaks.</p

Micropallet arrays for the capture, isolation and culture of circulating tumor cells from whole blood of mice engrafted with primary human pancreatic adenocarcinoma

Circulating tumor cells (CTCs) are important biomarkers of cancer progression and metastatic potential. The rarity of CTCs in peripheral blood has driven the development of technologies to isolate these tumor cells with high specificity; however, there are limited techniques available for isolating target CTCs following enumeration. A strategy is described to capture and isolate viable tumor cells from whole blood using an array of releasable microstructures termed micropallets. Specific capture of nucleated cells or cells expressing epithelial cell adhesion molecules (EpCAM) was achieved by functionalizing micropallet surfaces with either fibronectin, Matrigel or anti-EpCAM antibody. Surface grafting of poly(acrylic acid) followed by covalent binding of protein A/G enabled efficient capture of EpCAM antibody on the micropallet surface. MCF-7 cells, a human breast adenocarcinoma, were retained on the array surface with 90 ± 8% efficiency when using an anti-EpCAM-coated array. To demonstrate the efficiency of tumor cell retention on micropallet arrays in the presence of blood, MCF-7 cells were mixed into whole blood and added to small arrays (71 mm(2)) coated with fibronectin, Matrigel or anti-EpCAM. These approaches achieved MCF-7 cell capture from ≤10 μL of whole blood with efficiencies greater than 85%. Furthermore, MCF-7 cells intermixed with 1 mL blood and loaded onto large arrays (7171 mm(2)) were captured with high efficiencies (≥97%), could be isolated from the array by a laser-based approach and were demonstrated to yield a high rate of colony formation (≥85%) after removal from the array. Clinical utility of this technology was shown through the capture, isolation and successful culture of CTCs from the blood of mice engrafted with primary human pancreatic tumors. Direct capture and isolation of living tumor cells from blood followed by analysis or culture will be a valuable tool for cancer cell characterization

Reproducibility Project: Psychology

Reproducibility is a defining feature of science, but the extent to which it characterizes current research is unknown. We conducted replications of 100 experimental and correlational studies published in three psychology journals using high-powered designs and original materials when available

Data from: Estimating the reproducibility of psychological science

This record contains the underlying research data for the publication "Estimating the reproducibility of psychological science" and the full-text is available from: https://ink.library.smu.edu.sg/lkcsb_research/5257Reproducibility is a defining feature of science, but the extent to which it characterizes current research is unknown. We conducted replications of 100 experimental and correlational studies published in three psychology journals using high-powered designs and original materials when available. Replication effects were half the magnitude of original effects, representing a substantial decline. Ninety-seven percent of original studies had statistically significant results. Thirty-six percent of replications had statistically significant results; 47% of original effect sizes were in the 95% confidence interval of the replication effect size; 39% of effects were subjectively rated to have replicated the original result; and if no bias in original results is assumed, combining original and replication results left 68% with statistically significant effects. Correlational tests suggest that replication success was better predicted by the strength of original evidence than by characteristics of the original and replication teams