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Background The long-term prevalence and risk factors for post-acute COVID-19 sequelae (PASC) are not well described and may have important implications for unvaccinated populations and policy makers. Objective To assess health status, persistent symptoms, and effort tolerance approximately 1 year after COVID-19 infection Design Retrospective observational cohort study using surveys and clinical data Participants Survey respondents who were survivors of acute COVID-19 infection requiring Emergency Department presentation or hospitalization between March 3 and May 15, 2020. Main Measure(s) Self-reported health status, persistent symptoms, and effort tolerance Key Results The 530 respondents (median time between hospital presentation and survey 332 days [IQR 325–344]) had mean age 59.2±16.3 years, 44.5% were female and 70.8% were non-White. Of these, 41.5% reported worse health compared to a year prior, 44.2% reported persistent symptoms, 36.2% reported limitations in lifting/carrying groceries, 35.5% reported limitations climbing one flight of stairs, 38.1% reported limitations bending/kneeling/stooping, and 22.1% reported limitations walking one block. Even those without high-risk comorbid conditions and those seen only in the Emergency Department (but not hospitalized) experienced significant deterioration in health, persistent symptoms, and limitations in effort tolerance. Women (adjusted relative risk ratio [aRRR] 1.26, 95% CI 1.01–1.56), those requiring mechanical ventilation (aRRR 1.48, 1.02–2.14), and people with HIV (aRRR 1.75, 1.14–2.69) were significantly more likely to report persistent symptoms. Age and other risk factors for more severe COVID-19 illness were not associated with increased risk of PASC. Conclusions PASC may be extraordinarily common 1 year after COVID-19, and these symptoms are sufficiently severe to impact the daily exercise tolerance of patients. PASC symptoms are broadly distributed, are not limited to one specific patient group, and appear to be unrelated to age. These data have implications for vaccine hesitant individuals, policy makers, and physicians managing the emerging longer-term yet unknown impact of the COVID-19 pandemic. Supplementary Information The online version contains supplementary material available at 10.1007/s11606-021-07379-z.

Rheumatoid nodules are the most common extra-articular presentations of rheumatoid arthritis. Although rheumatoid nodules can develop anywhere in the body, they develop most commonly in the subcutaneous region, where they are easily exposed to repetitive trauma or pressure. However, an infrascapular presentation has not yet been reported. We report a case of giant bilateral rheumatoid nodules that developed in the infrascapular area, complicating its distinction from elastofibroma dorsi on radiological examination.

Retrospective comparison.To determine whether a previously developed MRI-derived BMD scoring system can differentiate between healthy and osteoporotic vertebrae and to validate this scoring system against quantitative computed tomography measurements.Bone mineral density is an important pre-operative consideration in spine surgery. Techniques to measure BMD are subject to falsely elevated values in the setting of spondylosis (DEXA) or require significant exposure to radiation (QCT). Previous studies have shown that MRI may be utilized to measure bone quality using changes in the bone marrow signal observed on T1-weighted MRIs.Retrospective study of patients who underwent operative lumbar procedures at a single tertiary institution between 2016 and 2021 (n=61). Vertebral bone quality (VBQ) scores were measured by dividing the median signal intensities of L1-L4 by the SI of CSF on noncontrast T1W MRI. Demographic data, comorbidities, VBQ scores, and QCT-derived T-scores and BMD of the lumbar spine were compared between healthy (T-score ≥-1; n=21), osteopenic (-2.5T-score-1; n=21), and osteoporotic (T-score ≤-2.5; n=19) cohorts using ANOVA with post-hoc Tukey test. Linear regression and receiver operating characteristic curve analyses were performed to assess the predictive value of VBQ scores. Pearson correlation test was used to evaluate the association between VBQ scores and QCT-derived measurements.VBQ differentiated between healthy and osteoporotic groups (P=0.009). ROC curve analysis revealed that a greater VBQ score was associated with presence of osteoporosis (AUC=0.754, P=0.006). Cutoff VBQ for osteoporosis was 2.6 (Youden index 0.484; sensitivity: 58%; specificity: 90%). VBQ scores weakly correlated with QCT-derived BMD (P=0.03, r=-0.27) and T-scores (P=0.04, r=-0.26).This study attempted to further validate a previously developed MRI-based BMD scoring system against QCT-derived measurements. VBQ score was found to be a significant predictor of osteoporosis and could differentiate between healthy and osteoporotic vertebrae.

Students’ cost perceptions have been associated with lower retention and academic performance in science, technology, engineering, and mathematics (STEM). Guided by expectancy-value theory, we exam...

College students do not study in isolated environments; rather, they encounter obstacles as they complete academic tasks. Using a qualitative approach, the present study explored the distractions a...

Digital distractions are an important and prevalent aspect of college students' lives. Using a self-regulated learning perspective, this chapter provides an in-depth understanding of students' digital distractions in academic settings and highlights how college instructors can empower their students to manage digital distractions and self-regulate their own learning. In particular, the chapter discusses both the causes and consequences of engaging in digital distractions with a focus on the impact of multitasking. In addition, the chapter argues that students' engagement in digital distractions is closely connected to their motivation and emotions. This chapter highlights how college students can regulate their digital distractions throughout the learning process during each phase of self-regulated learning. Finally, the chapter reviews the ways college instructors can support students' management of distractions through their instructional approaches.

To evaluate the image quality and lesion detectability of lower-dose CT (LDCT) of the abdomen and pelvis obtained using a deep learning image reconstruction (DLIR) algorithm compared with those of standard-dose CT (SDCT) images.This retrospective study included 123 patients (mean age ± standard deviation, 63 ± 11 years; male:female, 70:53) who underwent contrast-enhanced abdominopelvic LDCT between May and August 2020 and had prior SDCT obtained using the same CT scanner within a year. LDCT images were reconstructed with hybrid iterative reconstruction (h-IR) and DLIR at medium and high strengths (DLIR-M and DLIR-H), while SDCT images were reconstructed with h-IR. For quantitative image quality analysis, image noise, signal-to-noise ratio, and contrast-to-noise ratio were measured in the liver, muscle, and aorta. Among the three different LDCT reconstruction algorithms, the one showing the smallest difference in quantitative parameters from those of SDCT images was selected for qualitative image quality analysis and lesion detectability evaluation. For qualitative analysis, overall image quality, image noise, image sharpness, image texture, and lesion conspicuity were graded using a 5-point scale by two radiologists. Observer performance in focal liver lesion detection was evaluated by comparing the jackknife free-response receiver operating characteristic figures-of-merit (FOM).LDCT (35.1% dose reduction compared with SDCT) images obtained using DLIR-M showed similar quantitative measures to those of SDCT with h-IR images. All qualitative parameters of LDCT with DLIR-M images but image texture were similar to or significantly better than those of SDCT with h-IR images. The lesion detectability on LDCT with DLIR-M images was not significantly different from that of SDCT with h-IR images (reader-averaged FOM, 0.887 vs. 0.874, respectively;Overall image quality and detectability of focal liver lesions is preserved in contrast-enhanced abdominopelvic LDCT obtained with DLIR-M relative to those in SDCT with h-IR.

The purpose of this study was to develop and establish evidence supporting the validity of a brief scale designed to assess college students' regulation of motivation. This scale, titled the Brief Regulation of Motivation Scale, is more manageable to administer and intuitive to interpret compared to previous lengthy multidimensional scales. With a sample of 396 college students, multiple sources of validity evidence were examined. Exploratory and confirmatory analyses supported two separate factors subsequently titled regulation of motivation and willpower. The patterns of correlations between the two factors and critical aspects of self-regulated learning (e.g., motivation, learning strategies) were consistent with theoretical expectations. Only the regulation of motivation factor successfully predicted students' reported use of cognitive and metacognitive strategies and their procrastination. Overall, we found stronger support for the validity of regulation of motivation scale, by itself, as an indicator of students' general tendency to self-regulate their motivation.

Much attention has been given to investigating specific self-regulatory processes within a single goal context, yet little is known about how students manage to pursue multiple goals. We adopted a multi-method approach to examine the content of college students’ (N = 365) multiple goals, interrelations of goals in a goal network, and the role of self-regulatory processes during multiple goal pursuit. First, using thematic coding of qualitative data, we identified different types of academic, social, and well-being goals that students pursue within a particular college course. Second, using data visualization, we illustrated how these goals are dynamically connected to each other within a goal network. Finally, using mediation analysis of quantitative data, we found that students’ perceptions of the interrelations of goals were associated with academic, social, and well-being outcomes, either directly or indirectly through the use of motivational regulation strategies.

Purpose The purpose of this study is to investigate dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) and plasma cytokines and angiogenic factors (CAFs) as pharmacodynamic and prognostic biomarkers of bevacizumab monotherapy in colorectal cancer with liver metastasis (CRCLM). Materials and methods From July 2011 to March 2012, 28 patients with histologically confirmed CRCLM received bevacizumab monotherapy followed by combined FOLFOX therapy. The mean age of the patients was 57 years (range, 30 to 77 years). DCE-MRI (Ktransand IAUC60) was performed at baseline, first follow-up (3 days after bevacizumab monotherapy), and second follow-up (3 days after combined therapy). CAF levels (vascular endothelial growth factor [VEGF], placental growth factor [PlGF], and interleukin-8) were assessed on the same days. Progression-free survival (PFS) time distributions were summarized using the Kaplan-Meier method and compared using log-rank tests. Results The median PFS period was 11.2 months. Ktrans, IAUC60, VEGF, and PlGF values on the first follow-up day were significantly different compared with baseline values. No differences were observed on the second follow-up day. A > 40% decrease in Ktrans from baseline to first follow-up was associated with a longer PFS (hazard ratio, 0.349; 95% confidence interval, 0.133 to 0.912; p=0.032). Changes in CAFs did not show correlation with PFS time. Conclusion DCE-MRI parameters and CAFs are pharmacodynamic biomarkers of bevacizumab for CRCLM. In our study, change in Ktrans at 3 days after bevacizumab monotherapy was a favorable prognostic factor; however, the value of CAFs as a prognostic biomarker was not found.

The assumption that students can actively regulate multiple aspects of the learning process is foundational among many prominent conceptual models of self-regulated learning. However, empirical evidence does not yet clearly support the distinction between regulation of cognition, motivation, behavior, and context. This study (N = 273) focused on providing initial evidence on the distinction between cognitive, motivational, behavioral, and contextual aspects of college students' self-regulated learning and their unique roles in an integrated model with motivational antecedents and behavioral outcomes. Our findings demonstrate that students' reported use of regulatory strategies associated with motivation, cognition, behavior, and context are empirically distinct but closely related factors that each reflects a more general tendency for students to regulate their own learning. Our findings also indicate that the regulatory strategies associated with each of the four areas of self-regulated learning differentially associate with motivational antecedents and behavioral outcomes.

To investigate the effectiveness of qualitative diffusion-weighted imaging (DWI), subtraction of unenhanced from arterial phase images, and hepatobiliary phase (HBP) images in estimating the histopathological grade of hepatocellular carcinoma (HCC). We retrospectively reviewed gadoxetic acid–enhanced magnetic resonance images of 175 patients with 201 surgically resected HCCs. The signal intensity and its relationship with histopathological grade were assessed for each sequence and a combination of sequences. There was a tendency towards higher grades in tumours showing restricted diffusion on DWI (P

To evaluate the effect of neoadjuvant combined chemotherapy and radiation therapy (CCRT) on preoperative accuracy of multidetector computed tomography (CT) for resectability and tumor staging in patients with pancreatic head cancer.This retrospective study received institutional review board approval and was exempted from informed consent requirements. From May 2002 to March 2007, 38 patients with pancreatic head adenocarcinoma underwent multidetector CT before surgery. Of these, 12 patients received neoadjuvant CCRT. Imaging findings were evaluated for tumor resectability and tumor staging. Surgical and pathologic results were used as the reference standard. The accuracy of resectability and individual components of each T category were compared between the patients with neoadjuvant CCRT and without it by using the chi(2) test or Fisher exact test. A P of less than .05 was considered as significant.The accuracy in determining resectability was 83% (10 of 12) in patients who had received neoadjuvant CCRT and 81% (21 of 26) in patients who had not, without significant difference (P.05). Of 32 patients who underwent pancreaticoduodenectomy, histopathologic tumor staging was reported for T1 (n = 2), T2 (n = 1), and T3 (n = 9) lesions in patents with neoadjuvant CCRT (n = 12), and for T3 in all patients without neoadjuvant CCRT (n = 20). T-staging accuracy was 67% (eight of 12) with neoadjuvant CCRT and 95% (19 of 20) without it, with a significant difference (P = .0185).Neoadjuvant CCRT reduces the accuracy of tumor restaging after treatment of pancreatic head cancer, but this effect is not so great as to affect the determination of resectability.

Objective To determine whether quantitative perfusion parameters of dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) correlate with immunohistochemical markers of angiogenesis in rectal cancer. Materials and methods Preoperative DCE-MRI was performed in 63 patients with rectal adenocarcinoma. Transendothelial volume transfer (K(trans) ) and fractional volume of the extravascular-extracellular space (Ve) were measured by Interactive Data Language software in rectal cancer. After surgery, microvessel density (MVD) and vascular endothelial growth factor (VEGF) expression scores were determined using immunohistochemical staining of rectal cancer specimens. Perfusion parameters (K(trans) , Ve) of DCE-MRI in rectal cancer were found to be correlated with MVD and VEGF expression scores by Spearman's rank coefficient analysis. T stage and N stage (negative or positive) were correlated with perfusion parameters and MVD. Results Significant correlation was not found between any DCE-MRI perfusion parameters and MVD (rs = -0.056 and p = 0.662 for K(trans) ; rs = -0.103 and p = 0.416 for Ve), or between any DCE-MRI perfusion parameters and the VEGF expression score (rs = -0.042, p = 0.741 for K(trans) ; r = 0.086, p = 0.497 for Ve) in rectal cancer. TN stage showed no significant correlation with perfusion parameters or MVD (p > 0.05 for all). Conclusion DCE-MRI perfusion parameters, K(trans) and Ve, correlated poorly with MVD and VEGF expression scores in rectal cancer, suggesting that these parameters do not simply denote static histological vascular properties.

Our retrospective study compared Response Evaluation Criteria in Solid Tumors (RECIST) version 1.1 with modified CT criteria to determine their respective utilities as a prognostic indicator. Using both sets of criteria, we compared treatment responses of patients with colorectal liver metastases treated with bevacizumab-containing chemotherapy with those of patients treated with chemotherapy alone.Fifty-nine patients who received bevacizumab-containing chemotherapy (n=30, group 1) or chemotherapy alone (n=29, group 2) for the treatment of colorectal carcinoma underwent contrast-enhanced CT before treatment and 2 months after treatment. Two radiologists determined changes in tumor size and density between the pretreatment and 2-month follow-up CT images. RECIST 1.1 assesses responses on the basis of changes in tumor size, and the modified CT criteria assesses responses on the basis of changes in tumor density and size. Responses were correlated with time to tumor progression by log rank test.According to RECIST 1.1, nine of 30 patients (30%) in group 1 and 12 of 29 patients (41%) in group 2 were good responders. According to the modified CT criteria, 23 of 30 patients in group 1 (77%) and 23 of 29 patients in group 2 (79%) were good responders. As assessed by the modified CT criteria, good responders in both groups had significantly longer time to tumor progression than poor responders (p0.05). As assessed by RECIST 1.1, good responders in group 1 had significantly longer time to tumor progression than poor responders (p=0.0154), but there was no difference in group 2.Evaluating treatment response with tumor size and density changes on CT was a better predictor of time to tumor progression than changes in tumor size alone in both groups.

To compare the diagnostic accuracy of gadoxetate disodium-enhanced magnetic resonance imaging (EOB-MRI) on a 3-T system and integrated contrast-enhanced F-fluorodeoxyglucose positron emission tomography/computed tomography (CE-PET/CT) for the detection of hepatic metastases from colorectal cancers.: The approval from the institutional review board was obtained, and the requirement for informed consent was waived. We retrospectively evaluated 135 metastases in 68 patients (37 men, 31 women; mean age: 68 years; age range: 37-82 years) who underwent both EOB-MRI and CE-PET/CT. A total of 103 metastases were confirmed during surgery and 32 were confirmed by imaging findings during follow-up. The images were independently reviewed by 2 observers. The diagnostic accuracies of EOB-MRI and CE-PET/CT were determined by calculating the areas under each reader-specific receiver operating characteristic curve (Az). Patient-based lesion sensitivity and specificity were compared using the McNemar test.: The mean area under the Az on EOB-MRI versus CE-PET/CT was 0.94 versus 0.81 for all lesions (P0.001), 0.92 versus 0.60 for lesions ≤1 cm in size (P0.001), and 0.88 versus 0.96 for lesions1 cm (P = 0.098), respectively. The sensitivity, specificity, positive predictive values, and negative predictive value on a patient basis were 100%, 71%, 97%, and 100% for EOB-MRI and 93%, 71%, 97%, and 57% for CE-PET/CT, respectively.: EOB-MRI using a 3-T system is more accurate than CE-PET/CT, especially for the detection of small (≤1.0 cm) lesions. Patient-based analysis revealed that EOB-MRI has a higher sensitivity and negative predictive value than CE-PET/CT.

Purpose: To retrospectively compare the diagnostic accuracy for the detection of colorectal liver metastases between gadoxetic acid-enhanced MRI (EOB-MRI) and diffusion-weighted imaging (DWI) on 3.0 Tesla (T) system, and then to determine whether a combination of the two techniques may improve the diagnostic performance. Materials and Methods: Forty-seven patients underwent MR imaging at 3.0T, including DWI (DWI set) and dynamic and hepatobiliary phase EOB-MRI (EOB set) for the preoperative evaluation of colorectal liver metastases. All suspicious metastases were confirmed by hepatic surgery. Two blinded readers independently reviewed three different image sets, which consisted of DWI set, EOB set, and combined set. The accuracy was assessed by the area (Az) under the alternative-free response receiver operating characteristic curve, and the sensitivity and positive predictive value (PPV) were calculated. Results: We found a total of 78 confirmed colorectal liver metastases in 42 of 47 patients. Each reader noted higher diagnostic accuracy of combined set of EOB-MRI and DWI than DWI set and EOB set, without statistical significance. Regardless of the size of colorectal liver metastasis, each reader detected significantly more metastases on combined set than on DWI set, and PPV was significantly higher with DWI set than with EOB set or with combined set for one reader. Conclusion: EOB-MRI was more useful for the detection of colorectal liver metastases, while DWI was more useful for their characterization. The combination of EOB-MRI and DWI showed significantly higher accuracy and sensitivity for the preoperative detection of small colorectal liver metastases than DWI. J. Magn. Reson. Imaging 2011;. © 2011 Wiley-Liss, Inc.

Objective: To evaluate the clinical usefulness of positive oral contrast computed tomography (CT) for the detection of leakage and its relationship with the immediate postoperative outcome after gastrectomy for gastric cancer. Methods: A total of 210 patients with a clinical suspicion of leakage after gastrectomy for gastric cancer underwent a positive oral contrast CT. Two radiologists retrospectively reviewed the CT images, recorded the presence of extraluminal contrast leakage, and graded the amount of leaked contrast. The rate of postoperative intervention treatment, the length of postoperative hospital stay, and mortality rates were correlated with the presence and grades of leakage. Matching accuracy between CT and other diagnostic studies in detection of leakage was also evaluated. Results: There were 162 patients without extraluminal contrast leakage (77.1%), 13 with grade 1 leakage (6.2%), 19 with grade 2 (9.0%), and 16 with grade 3 (7.6%). Postoperative intervention rate, hospital stay, and mortality were significantly higher in patients with extraluminal contrast than those in patients without extraluminal contrast (P < 0.05). Postoperative hospital stays increased as the leakage grades increased (P = 0.0008). The matching accuracy between CT and other studies was 82.1% (n = 32/39). Conclusions: Positive oral contrast CT can be a reliable tool for diagnosing postoperative leakage that requires further intervention after gastrectomy in gastric cancer patients, and the immediate postoperative outcome may be related with the grade of leaked contrast on CT.

The liver is an extranodal organ that is frequently invaded by lymphomas, with most cases involving secondary lymphomas (1). The image findings of hepatic lymphoma have been reported as variable, ranging from single or multiple nodules to diffuse infiltrates (1, 2). It is known that hepatic lymphomas show low signal intensity on T1 weighted images, high signal intensity on T2 weighted images, and low signal intensity on hepatobiliary phase image, using hepatocyte-specific contrast agents (3, 4). Here, we report an atypical case of hepatic lymphoma showing iso-signal intensity on hepatobiliary phase of contrast-enhanced MRI using gadoxetic acid (Gd-EOB-DTPA, Primovist; Bayer Schering Pharma, Berlin, Germany).

As a result of recent developments in imaging modalities and wide spread routine medical checkups and screening, more incidental liver lesions are found frequently on US these days. When incidental liver lesions are found on US, physicians have to make a decision whether to just follow up or to undergo additional imaging studies for lesion characterization. In order to choose the next appropriate imaging modality, the diagnostic accuracy of each imaging study needs to be considered. Therefore, we tried to compare the accuracy of contrast-enhanced multidetector CT (MDCT) and Gd-EOB-DTPA-enhanced MRI for characterization of incidental liver masses. We included 127 incidentally found focal liver lesions (94 benign and 33 malignant) from 80 patients (M∶F = 45∶35) without primary extrahepatic malignancy or chronic liver disease. Two radiologists independently reviewed Gd-EOB-DTPA-enhanced MRI and MDCT. The proportion of confident interpretations for differentiation of benign and malignant lesions and for the specific diagnosis of diseases were compared. The proportion of confident interpretations for the differentiation of benign and malignant lesions was significantly higher with EOB-MRI(94.5%-97.6%) than with MDCT (74.0%-92.9%). In terms of specific diagnosis, sensitivity and accuracy were significantly higher with EOB-MRI than with MDCT for the diagnosis of focal nodular hyperplasia (FNH) and focal eosinophilic infiltration. The diagnoses of the remaining diseases were comparable between EOB-MRI and MDCT. Hence, our results suggested that Gd-EOB-MRI may provide a higher proportion of confident interpretations than MDCT, especially for the diagnosis of incidentally found FNH and focal eosinophilic infiltration.