Tag: pubmed

Med Phys. 2021 Aug 9. doi: 10.1002/mp.15149. Online ahead of print.

ABSTRACT

PURPOSE: PET attenuation correction (AC) in PET/MR scanners constitutes a critical and barely explored issue in spinal cord investigation, mainly due to the limitations in accounting for highly attenuating bone structures which surround the spinal canal. Our study aims at evaluating the clinical suitability of MR-driven AC (MRAC) for ¹⁸ F-FDG-PET in spinal cord.

METHODS: Thirty-six patients, undergoing PET/CT and PET/MR in the same session for oncological examination, were retrospectively analyzed. For each patient, raw PET data from PET/MR scanner were reconstructed with 4- and 5-class MRAC maps, generated by hybrid PET/MR system (PET_MRAC4 and PET_MRAC5, respectively), and an AC map derived from CT data after a custom co-registration pipeline (PET_rCTAC), which served as reference. Mean PET standardized uptake values (SUV_m ) were extracted from the three reconstructed PET images by regions of interest (ROIs) identified on T2-weighted MRI, in the spinal cord, lumbar cerebrospinal fluid (CSF), and vertebral marrow at 5 levels (C2, C5, T6, T12, and L3). SUV_m values from PET_MRAC4 and PET_MRAC5 were compared with each other and with the reference by means of paired t-test, and correlated using Pearson’s correlation (r) to assess their consistency. Cohen’s d was calculated to assess the magnitude of differences between PET images.

RESULTS: SUV_m values from PET_MRAC4 were lower than those from PET_MRAC5 in almost all analyzed ROIs, with a mean difference ranging from 0.03 to 0.26 (statistically significant in the vertebral marrow at C2 and C5, spinal cord at T6 and T2, and CSF at L3). This was also confirmed by the effect size, with highest values at low spinal levels (d = 0.45 at T12 in spinal cord, d = 0.95 at L3 in CSF). SUV_m values from PET_MRAC4 and PET_MRAC5 showed a very good correlation (0.81 < r < 0.97, p < 0.05) in all spinal ROIs. Underestimation of SUV_m between PET_MRAC4 and PET_rCTAC was observed at each level, with a mean difference ranging from 0.02 to 0.32 (statistically significant in the vertebral marrow at C2 and T6, and CSF at L3). Although also PET_MRAC5 underestimates PET_rCTAC (mean difference ranging from 0.02 to 0.3), an overall decrease in effect size could be observed for PET_MRAC5, mainly at lower spinal levels (T12, L3). SUV_m from both PET_MRAC4 and PET_MRAC5 methods showed r value from good to very good with respect to PET_rCTAC (0.67 < r < 0.9 and 0.73 < r < 0.94, p < 0.05, respectively).

CONCLUSIONS: Our results showed that neglecting bones in AC can underestimate the FDG uptake measurement of the spinal cord. The inclusion of bones in MRAC is far from negligible and improves the AC in spinal cord, mainly at low spinal levels. Therefore, care must be taken in the spinal canal region and the use of AC map reconstruction methods accounting for bone structures could be beneficial. This article is protected by copyright. All rights reserved.

PMID:34369590 | DOI:10.1002/mp.15149

J Cell Physiol. 2021 Aug 9. doi: 10.1002/jcp.30551. Online ahead of print.

ABSTRACT

Elevated plasma levels of plasminogen activator inhibitor-1 (PAI-1) are documented in patients with sepsis and levels positively correlate with disease severity and mortality. Our previous work demonstrated that visceral adipose tissues (VAT) are a major source of PAI-1, especially in the aged (murine endotoxemia), that circulating PAI-1 protein levels match the trajectory of PAI-1 transcript levels in VAT (clinical sepsis), and that PAI-1 in both VAT and plasma are positively associated with acute kidney injury (AKI) in septic patients. In the current study utilizing preclinical sepsis models, PAI-1 tissue distribution was examined and cellular sources, as well as mechanisms mediating PAI-1 induction in VAT, were identified. In aged mice with sepsis, PAI-1 gene expression was significantly higher in VAT than in other major organs. VAT PAI-1 gene expression correlated with PAI-1 protein levels in both VAT and plasma. Moreover, VAT and plasma levels of PAI-1 were positively associated with AKI markers, modeling our previous clinical data. Using explant cultures of VAT, we determined that PAI-1 is secreted robustly in response to recombinant transforming growth factor β (TGFβ) and tumor necrosis factor α (TNFα) treatment; however, neutralization was effective only for TNFα indicating that TGFβ is not an endogenous modulator of PAI-1. Within VAT, TNFα was localized to neutrophils and macrophages. PAI-1 protein levels were fourfold higher in stromal vascular fraction (SVF) cells compared with mature adipocytes, and among SVF cells, both immune and nonimmune compartments expressed PAI-1 in a similar fashion. PAI-1 was localized predominantly to macrophages within the immune compartment and preadipocytes and endothelial cells within the nonimmune compartment. Collectively, these results indicate that induction and secretion of PAI-1 from VAT is facilitated by a complex interaction among immune and nonimmune cells. As circulating PAI-1 contributes to AKI in sepsis, understanding PAI-1 regulation in VAT could yield novel strategies for reducing systemic consequences of PAI-1 overproduction.

PMID:34369600 | DOI:10.1002/jcp.30551

J Card Surg. 2021 Aug 9. doi: 10.1111/jocs.15888. Online ahead of print.

ABSTRACT

PURPOSE: Extracorporeal membrane oxygenation (ECMO) is a refractory treatment for acute respiratory distress syndrome (ARDS) due to influenza and severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2, also referred to as coronavirus disease 2019 [COVID-19]). We conducted this study to compare the outcomes of influenza patients treated with veno-venous-ECMO (VV-ECMO) to COVID-19 patients treated with VV-ECMO, during the first wave of COVID-19.

METHODS: Patients in our institution with ARDS due to COVID-19 or influenza who were placed on ECMO between August 1, 2010 and September 15, 2020 were included in this comparative, retrospective study. To improve homogeneity, only VV-ECMO patients were analyzed. The clinical characteristics and outcomes were extracted and analyzed.

RESULTS: A total of 28 COVID-19 patients and 17 influenza patients were identified and included. ECMO survival rates were 68% (19/28) in COVID-19 patients and 94% (16/17) in influenza patients (p = .04). Thirty days survival rates after ECMO decannulation were 54% (15/28) in COVID-19 patients and 76% (13/17) in influenza patients (p = .13). COVID-19 patients spent a longer time on ECMO compared to flu patients (21 vs. 12 days; p = .025), and more COVID-19 patients (26/28 vs. 2/17) were on immunomodulatory therapy before ECMO initiation (p < .001). COVID-19 patients had higher rates of new infections during ECMO (50% vs. 18%; p = .03) and bacterial pneumonia (36% vs. 6%; p = .024).

CONCLUSIONS: COVID-19 patients who were treated in our institution with VV-ECMO had statistically lower ECMO survival rates than influenza patients. It is possible that COVID-19 immunomodulation therapies may increase the risk of other superimposed infections.

PMID:34369601 | DOI:10.1111/jocs.15888

Brief Funct Genomics. 2021 Aug 9:elab034. doi: 10.1093/bfgp/elab034. Online ahead of print.

ABSTRACT

We propose the hierarchical Projective Adaptive Resonance Theory (PART) algorithm for classification of gene expression data. This algorithm is realized by combing transposed quasi-supervised PART and unsupervised PART. We develop the corresponding validation statistics for each process and compare it with other clustering algorithms in a case study of tuberculosis (TB). First, we use sample-based transposed quasi-supervised PART to obtain optimal clustering results of samples distinguished by time post-infection and the representative genes for each cluster including up-regulated, down-regulated and stable genes. The up- and down-regulated genes show more than 90% similarity to the result derived from Linear Models for Microarray Data and are verified by weighted k-nearest neighbor model on TB projection. Second, we use gene-based unsupervised PART algorithm to cluster these representative genes where functional enrichment analysis is conducted in each cluster. We further confirm the main immune response of human macrophage-like THP-1 cells against TB within 2 days is type I interferon-mediated innate immunity. This study demonstrates how hierarchical PART algorithm analyzes microarray data. The sample-based quasi-supervised PART extracts representative genes and narrows down the shortlist of disease-relevant genes and gene-based unsupervised PART classifies representative genes that help to interpret immune response against TB.

PMID:34369558 | DOI:10.1093/bfgp/elab034

East Mediterr Health J. 2021 Jul 29;27(7):656-664. doi: 10.26719/2021.27.7.656.

ABSTRACT

BACKGROUND: Efforts to reduce inappropriate hospital stay, including alternatives such as homecare, are important to improve patient care and reduce health care costs.

AIMS: This study evaluated inappropriate hospital stay in Shiraz, Islamic Republic of Iran and the extent to which these stays were due to lack of homecare services and others factors needed for homecare.

METHODS: This cross-sectional study was conducted between January 2018 and September 2019 at two public hospitals in Shiraz. All adult patients hospitalized in these two hospitals in the study period were included, except patients in mental care wards. Appropriateness of patients’ hospital stay was assessed on a daily basis using the Iranian version of the Appropriateness Evaluation Protocol. The chi-squared test was used to assess association between need for homecare and patient characteristics.

RESULTS: Of 6458 hospitalization days assessed (for 1954 patients), 710 (11.0%) days were inappropriate. The greatest proportion of causes of inappropriate stay were physician-related (32.9%). Of the 710 inappropriate hospitalization days, 231 were due to lack of homecare services. Most patients who were inappropriately hospitalized because of lack of homecare services were insured through Salamat insurance (64.0%). A statistically significant relationship was found between the need for homecare services and the type of health insurance (P = 0.01). Of the patients admitted to hospital because of lack of homecare services, 36.8% had endocrine diseases, especially diabetes, and 21.8% needed oxygen services.

CONCLUSION: Institutionalizing home health care in the Iranian health system could encourage more home health care referral and reduce inappropriate hospitalization, especially for diabetes.

PMID:34369579 | DOI:10.26719/2021.27.7.656

J Neurol Phys Ther. 2021 Aug 6. doi: 10.1097/NPT.0000000000000368. Online ahead of print.

ABSTRACT

BACKGROUND AND PURPOSE: Falls are a major health concern after stroke. Spatial and temporal gait asymmetry and variability can contribute to instability and increased fall risk in persons with stroke (PwS). We aimed to quantify gait spatiotemporal symmetry and variability parameters in PwS undergoing rehabilitation in the subacute stage of the disease, by comparison to healthy participants, and to examine the associations between these parameters and patients’ reactive and proactive balance capacity.

METHODS: Twenty-two PwS and 12 healthy adults walked over a computerized treadmill system at their self-selected walking speed. Symmetry and variability of gait parameters (step length, swing time, and stance time) as well as upper extremity and lower extremity angular range of motion in the sagittal plane were extracted. In addition, the Berg Balance Scale (BBS) and the fall threshold in response to sudden surface translations at increasing intensities were assessed.

RESULTS: PwS demonstrated significantly higher asymmetry in all gait parameters in comparison to controls. Also, PwS demonstrated increased stance time variability in comparison to healthy controls and increased swing time variability in the paretic lower extremity. Significant negative associations were found between fall threshold and stance time asymmetry in PwS (r = -0.48, P = 0.022), between the BBS and swing time asymmetry (r = -0.50, P = 0.018), and between the BBS and stance time variability of the paretic lower extremity (r = -0.56, P = 0.006).

DISCUSSION AND CONCLUSIONS: Findings highlight the importance of gait temporal symmetry and variability measures for dynamic balance control after stroke. These parameters should be considered when assessing gait recovery and safety in PwS.Video Abstract available for more insight from the authors (see the Supplementary Video, available at: http://links.lww.com/JNPT/A355).

PMID:34369447 | DOI:10.1097/NPT.0000000000000368

J Craniofac Surg. 2021 Aug 6. doi: 10.1097/SCS.0000000000008077. Online ahead of print.

ABSTRACT

We aimed to recommend an efficient algorithm to detect the presence of specific pathologies of the lacrimal sac (LS). The charts of 296 patients who had undergone LS biopsy were reviewed retrospectively. The age, gender, history, examination and radiological findings, sac appearance, and pathology results of the patients were recorded. The power of our data to predict the presence of potential specific pathology was identified by regression analysis. After the causality evaluation of the statistical results, an algorithm was created to differentiate specific LS pathologies from chronic dacryocystitis. Our algorithm was mainly formed by deciding on radiological examination and biopsy according to the risk scoring created by the examination findings. A specific LS pathology was observed in 11 (3.7%) patients. When we applied the recommended algorithm to cases with a suspicion of specific pathology and/or found to have a specific pathology, 36.4% of the patients would not require radiological examination and 29.6% of them would not require a biopsy. On the other hand, 80% of the frozen biopsies had been conducted on cases without a specific pathology. Managing the cases according to our algorithm would mean that frozen biopsy would be recommended in only 1 (12.5%) case without a specific pathology. Besides, the detection of cases with a specific pathology would not be prevented and the necessary diagnostic procedures would continue to be performed. Specific LS pathologies can be detected adequately, whereas decreasing unnecessary examinations and procedures in cases without a specific pathology by using our algorithm.

PMID:34369466 | DOI:10.1097/SCS.0000000000008077

Demography. 2021 Aug 9:9420322. doi: 10.1215/00703370-9420322. Online ahead of print.

ABSTRACT

The literature suggests a positive link between homeownership and the transition to parenthood. However, in recent decades, couples’ preference for becoming homeowners before having their first child has been undermined by rising housing unaffordability and housing uncertainty. An archetypal example is Britain, where homeownership rates among young adults have fallen substantially as a result of low wages, unemployment, reductions in the availability of mortgage credit, and rising house prices. This situation has produced a housing crisis. Using longitudinal data from the British Household Panel Survey (1991-2008) and the United Kingdom Household Longitudinal Study (2009-2016), we apply multilevel, discrete-time event-history techniques to a sample of women aged 18-42. We investigate whether and how the link between homeownership and entering parenthood has changed in Britain in recent decades. Our findings reveal that in comparison with the 1990s, the likelihood of becoming a parent has declined among homeowners, whereas childbearing rates among private renters have remained stable. Thus, owner-occupiers and private renters have become more similar in terms of their likelihood of entering parenthood. Overall, our findings question the classical micro-level assumption of a positive link between homeownership and transition to parenthood, at least among Britain’s “Generation Rent.” These findings are subsequently interpreted in terms of increased housing uncertainty.

PMID:34369553 | DOI:10.1215/00703370-9420322

J Hosp Palliat Nurs. 2021 Aug 4. doi: 10.1097/NJH.0000000000000778. Online ahead of print.

ABSTRACT

Chronic obstructive pulmonary disease (COPD) is a progressive, life-limiting illness. Despite significant symptom burden, access to advance care planning (ACP) and palliative care are limited. Early initiation of ACP enables patients to articulate the values that underpin the decisions they would make if, in the future, they are unable to speak for themselves. Nurses constitute the majority of health care workforce and are well placed to initiate these discussions. This study explored knowledge, attitudes, and practice regarding ACP for patients with COPD among Australian and New Zealand respiratory nurses. A cross-sectional online survey tested knowledge about ACP and canvassed attitudes about current practice. Data were analyzed using descriptive statistics and content analysis of text data. The 112 participating respiratory nurses had substantial knowledge and positive attitudes regarding ACP in COPD; however, they lacked confidence and clarity regarding their role. Despite advances in end-of-life care provision for chronic disease, well-established barriers remained (inadequate training, fear of distressing patients, and time), and discussion triggers were still linked to acute deterioration, diagnosis of severe disease, and patient initiation. Better articulating the role of the respiratory nurse in ACP and building capacity and confidence within this workforce may improve ACP access for people living with COPD.

PMID:34369423 | DOI:10.1097/NJH.0000000000000778

J Neurosci Nurs. 2021 Aug 6. doi: 10.1097/JNN.0000000000000608. Online ahead of print.

ABSTRACT

BACKGROUND: The sexuality of people with spinal cord injury (SCI) is a subject often neglected by healthcare professionals because of their lack of knowledge or understanding of how to proceed in this context. Different teaching strategies can be used to fill this knowledge gap, such as clinical simulation and peer-assisted learning. This study evaluates the effects of an educational intervention on nursing students’ knowledge acquisition about the sexuality of individuals with SCI and on the students’ self-confidence and satisfaction with the experience. METHODS: Quasi-experimental, pretest-posttest design was conducted with nursing students (N = 54). The intervention was the application by a senior-level nursing student of 2 scenarios of high-fidelity clinical simulation. The primary outcome was the knowledge about the sexuality of people with SCI. The secondary outcome was the satisfaction and self-confidence in learning. We performed descriptive and inferential statistics and built multiple linear regression models. RESULTS: The effect of the intervention on knowledge acquisition ranged from the mean of 1.26 in the pretest to 3.10 in the posttest. The means in the scores of satisfaction and self-confidence were considered excellent and correlated with knowledge acquisition. Previous attendance of a class on SCI positively interfered in the scale of knowledge acquisition. CONCLUSION: We verified an effect size ranging from medium to large magnitude for knowledge acquisition, and great satisfaction and self-confidence in learning through the use of simulated experience and peer-assisted learning.

PMID:34369432 | DOI:10.1097/JNN.0000000000000608