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Tan PY, Huo M, Zhou XH, Zhao BL. Development and validation of a nomogram for predicting the risk of nursing home-acquired pneumonia. Eur Rev Med Pharmacol Sci 2022; 26:8276-8288. [PMID: 36459011 DOI: 10.26355/eurrev_202211_30360] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
OBJECTIVE Nursing home-acquired pneumonia (NHAP) is one of the most frequent infections in nursing homes, with a difficult diagnosis, poor prognosis, and high mortality. The present study was performed to develop and validate a nomogram to predict the risk of NHAP in nursing homes. MATERIALS AND METHODS Based on a literature review and clinician's recommendations, we identified and collected the possible factors affecting the occurrence of NHAP. Based on the above factors, a retrospective observational study of 620 nursing home residents' medical records was performed from September 2016 to September 2021. Significant risk factors for NHAP were identified by univariate and multivariate analysis successively. A nomogram was constructed based on the binary logistic regression models to visualize the prediction model. The model's performance was determined by the concordance index (C-index), and the prediction accuracy was evaluated using a calibration curve. Clinical effectiveness was evaluated by decision curve analysis (DCA). RESULTS Finally, 12 independent risk factors were identified and assembled into the nomogram. The nomogram had a C-index of 0.958 (95% confidence interval: 0.943-0.972). The area under the receiver operating characteristic curve (AUC-ROC) value of the nomogram was 0.958 (p<0.05), and the calibration plot showed good goodness of fit. The decision curve analysis and clinical impact curve showed good clinical usefulness of the nomogram. CONCLUSIONS A nomogram for the early prediction of NHAP, which is easy for nurses to perform in nursing homes, was successfully constructed and validated, and it had a good predictive performance.
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Affiliation(s)
- P-Y Tan
- School of Nursing Dalian University, Dalian, Liaoning Province, China.
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2
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Shanker M, Foley H, Crowley S, Thomson E, Bradhurst C, Huo M, Atkinson V, Foote M, Pinkham M. PD-0079 Volumetric responses with stereotactic radiosurgery and immunotherapy in melanoma brain metastases. Radiother Oncol 2022. [DOI: 10.1016/s0167-8140(22)02749-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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3
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Liu CH, Huo M, Qin HH, Zhao BL. Critical prognostic factors for poststroke dysphagia: a meta-analysis. Eur Rev Med Pharmacol Sci 2022; 26:610-622. [PMID: 35113437 DOI: 10.26355/eurrev_202201_27888] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
OBJECTIVE Poststroke dysphagia (PSD) is one of the most significant problems after stroke. The prognosis of dysphagia is closely related to the outcomes of stroke. This meta-analysis aimed at identifying and evaluating critical predictors of prognosis for PSD. MATERIALS AND METHODS Electronic databases were searched for relevant case-control and cohort studies in which the prognostic factors of PSD were reported. The methodological quality of the studies was assessed using the Newcastle-Ottawa Scale. Review Manager 5.3 was used to calculate odds ratios (OR) and their 95% confidence intervals (CI) of the included factors and to perform heterogeneity and sensitivity analyses. Stata 15.1 was used to evaluate publication bias. RESULTS Eighteen of 3132 total studies were finally included in this meta-analysis. Ten predictors of PSD were identified, including 2 protective factors and 8 risk factors. Early intervention (OR=0.75, 95% CI=0.61-0.93) and an MRS (modified Rankin scale) score of 0 before onset (OR=0.58, 95% CI=0.47-0.71) were related to a better prognosis of PSD. The risk factors ranked by pooled OR values were aspiration (OR=7.64, 95% CI=5.94-9.82), brainstem injury (OR=4.82, 95% CI=3.01-7.72), severity of stroke (OR= 3.06, 95% CI=1.69-5.53), bihemispheric injury (OR=3.0, 95% CI=1.67-5.40), older age (OR=1.75, 95% CI=1.50-2.04), malnutrition (OR=1.36, 95% CI=1.22-1.53), severe dysphagia on admission (OR=1.16, 95% CI=1.03-1.29), and reduced level of consciousness (OR=1.03, 95% CI=1.00-1.07). CONCLUSIONS Prognostic factors for a good outcome of PSD included early intervention and an MRS score of 0 before onset. Aspiration, brainstem injury, severe stroke and bihemispheric injury are the four most significant predictors of poor prognosis in PSD. Identifying these prognostic factors should help clinicians to better detect patients at risk and provide effective interventions for PSD.
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Affiliation(s)
- C H Liu
- Department of Clinical Nursing, Jiamusi College, Heilongjiang University of Chinese Medicine, Jiamusi, Heilongjiang, P.R. China.
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4
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Gallo J, Garimall S, Shanker M, Castelli J, Watkins T, Olson S, Huo M, Foote MC, Pinkham MB. Outcomes Following Hypofractionated Stereotactic Radiotherapy to the Cavity After Surgery for Melanoma Brain Metastases. Clin Oncol (R Coll Radiol) 2021; 34:179-186. [PMID: 34642065 DOI: 10.1016/j.clon.2021.09.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2021] [Revised: 09/05/2021] [Accepted: 09/21/2021] [Indexed: 11/18/2022]
Abstract
AIMS Hypofractionated stereotactic radiotherapy (HSRT) to the cavity after surgical resection of brain metastases improves local control. Most reported cohorts include few patients with melanoma, a population known to have high rates of recurrence and neurological death. We aimed to assess outcomes in patients with melanoma brain metastases who received HSRT after surgery at two Australian institutions. MATERIALS AND METHODS A retrospective analysis was carried out including patients treated between January 2012 and May 2020. HSRT was recommended for patients with melanoma brain metastases at high risk of local recurrence after surgery. Treatment was delivered using appropriately commissioned linear accelerators. Routine follow-up included surveillance magnetic resonance imaging brain every 3 months for at least 2 years. Primary outcomes were overall survival, local control, incidence of radiological radionecrosis and symptomatic radionecrosis. RESULTS There were 63 cavities identified in 57 patients. The most common HSRT dose prescriptions were 24 Gy in three fractions and 27.5 Gy in five fractions. The median follow-up was 32 months in survivors. Local control was 90% at 1 year, 83% at 2 years and 76% at 3 years. Subtotal brain metastases resection (hazard ratio 12.5; 95% confidence interval 1.4-111; P = 0.0238) was associated with more local recurrence. Overall survival was 64% at 1 year, 45% at 2 years and 40% at 3 years. There were 10 radiological radionecrosis events (16% of cavities) during the study period, with 5% at 1 year and 8% at 2 years after HSRT. The median time to onset of radiological radionecrosis was 21 months (range 6-56). Of these events, three became symptomatic (5%) during the study period at a median time to onset of 26 months (range 21-32). CONCLUSION Cavity HSRT is associated with high rates of local control in patients with melanoma brain metastases. Subtotal resection strongly predicts for local recurrence after HSRT. Symptomatic radionecrosis occurred in 5% of cavities but increased to 8% of longer-term survivors.
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Affiliation(s)
- J Gallo
- Department of Radiation Oncology, Princess Alexandra Hospital, Woolloongabba, Queensland, Australia; Faculty of Medicine, University of Queensland, Brisbane, Queensland, Australia.
| | - S Garimall
- Faculty of Medicine, University of Queensland, Brisbane, Queensland, Australia
| | - M Shanker
- Department of Radiation Oncology, Princess Alexandra Hospital, Woolloongabba, Queensland, Australia; Faculty of Medicine, University of Queensland, Brisbane, Queensland, Australia; Princess Alexandra Hospital Research Foundation, Woolloongabba, Queensland, Australia
| | - J Castelli
- Icon Cancer Centre, Greenslopes Private Hospital, Greenslopes, Queensland, Australia
| | - T Watkins
- Department of Radiation Oncology, Princess Alexandra Hospital, Woolloongabba, Queensland, Australia
| | - S Olson
- Department of Radiation Oncology, Princess Alexandra Hospital, Woolloongabba, Queensland, Australia
| | - M Huo
- Department of Radiation Oncology, Princess Alexandra Hospital, Woolloongabba, Queensland, Australia; Faculty of Medicine, University of Queensland, Brisbane, Queensland, Australia
| | - M C Foote
- Department of Radiation Oncology, Princess Alexandra Hospital, Woolloongabba, Queensland, Australia; Faculty of Medicine, University of Queensland, Brisbane, Queensland, Australia; Icon Cancer Centre, Greenslopes Private Hospital, Greenslopes, Queensland, Australia
| | - M B Pinkham
- Department of Radiation Oncology, Princess Alexandra Hospital, Woolloongabba, Queensland, Australia; Faculty of Medicine, University of Queensland, Brisbane, Queensland, Australia; Icon Cancer Centre, Greenslopes Private Hospital, Greenslopes, Queensland, Australia
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5
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Shanker M, Foley H, Crowley S, Thompson E, Bradhurst C, Huo M, Atkinson V, Foote M, Pinkham M. Quantitative Volumetric Tumor Response And Toxicity Outcomes In Patients Treated With Combination Stereotactic Radiosurgery (SRS) And Immunotherapy For Melanoma Brain Metastases. Int J Radiat Oncol Biol Phys 2020. [DOI: 10.1016/j.ijrobp.2020.07.062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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6
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Huo M, Shultz D, Laperriere N, Hodaie M, Cusimano M, Gentili F, Payne D, Berlin A, Schwartz M, Millar B, Zadeh G, Coolens C, Tsang D. PO-0855: Radiation-induced meningiomas: outcomes following stereotactic radiosurgery. Radiother Oncol 2020. [DOI: 10.1016/s0167-8140(21)00872-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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7
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Huo M, Morley L, Dawson L, Bissonnette J, Helou J, Giuliani M, Berlin A, Shultz D, Hosni A, Shessel A, Barry A. PO-1757: Peer Review in Stereotactic Body Radiotherapy: The Impact of Case Volume. Radiother Oncol 2020. [DOI: 10.1016/s0167-8140(21)01775-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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8
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Xie Y, Song T, Huo M, Zhang Y, Zhang YY, Ma ZH, Wang N, Zhang JP, Chu L. Fasudil alleviates hepatic fibrosis in type 1 diabetic rats: involvement of the inflammation and RhoA/ROCK pathway. Eur Rev Med Pharmacol Sci 2019; 22:5665-5677. [PMID: 30229844 DOI: 10.26355/eurrev_201809_15834] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
OBJECTIVE Rho-associated kinases (ROCKs) are recognized to be involved in many pathophysiological processes caused by hyperglycemia. We performed experiments to evaluate the effects of fasudil, the Rho/ROCK inhibitor, on preventing hepatic fibrosis in type 1 diabetic rats and to elucidate the underlying mechanisms. MATERIALS AND METHODS Sprague-Dawley (SD) rats were randomly divided into five groups: normal control (NC), untreated diabetic (DM), low-dose fasudil-treated (L-Fas), high-dose fasudil-treated (H-Fas) and captopril-treated (Cap) groups. Streptozotocin was injected to establish the diabetes model. Alanine aminotransferase (ALT), aspartate aminotransferase (AST) and inflammatory factors such as tumor necrosis factor-α (TNF-α) and interleukin-6 (IL-6), were analyzed. Hematoxylin and eosin (HE) and Masson's trichrome staining were used for histological observations. The expression of transforming growth factor-β (TGF-β1), metalloproteinase-9 (MMP-9)/tissue inhibitor of metalloproteinase-1 (TIMP-1), collagen type Iα (Coll α1), nuclear factor-kappa B (NF-κB) and ROCK-1 were measured to investigate the mechanisms involved in fibrosis. RESULTS The DM group exhibited hepatic fibrosis with remarkable liver damage and inflammation reaction by the activation of the NF-κB pathway. Treatment with fasudil or captopril suppressed not only the inflammation reaction but also the accumulation of the extracellular matrix due to the downregulation of TGF-β1 and MMP-9/TIMP-1, which induces the amelioration of the liver fibrosis with diabetes. Furthermore, fasudil significantly attenuated the activation of ROCK-1 and NF-κB in the livers of diabetic rats. CONCLUSIONS These results suggest that fasudil exert anti-inflammation actions and markedly decrease the accumulation of extracellular matrix. Fasudil is a good candidate agent for treating hepatic fibrosis in diabetes.
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Affiliation(s)
- Y Xie
- Department of Pharmacology, Hebei Medical University, Shijiazhuang, China.
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9
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Graham J, Huo M, Birditt K, Charles S, Fingerman K. INTERPERSONAL TENSIONS AND PAIN AMONG OLDER ADULTS: THE MEDIATING ROLE OF NEGATIVE MOOD. Innov Aging 2018. [DOI: 10.1093/geroni/igy031.3568] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- J Graham
- The University of Texas at Austin
| | - M Huo
- The University of Texas at Austin
| | | | - S Charles
- The University of California, Irvine
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10
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Huo M, Fingerman K. EMOTIONS AND SOCIAL TIES IN LATE LIFE: NEW FINDINGS FROM THE DAILY EXPERIENCES AND WELL-BEING STUDY. Innov Aging 2018. [DOI: 10.1093/geroni/igy023.3186] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- M Huo
- The University of Texas at Austin, Austin, Texas
| | - K Fingerman
- The University of Texas at Austin, Austin, Texas
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11
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Beaulieu C, Kim K, Huo M, Zarit S, Fingerman K. ADULT GRANDCHILD SUPPORT PROVIDED TO GRANDPARENTS. Innov Aging 2018. [DOI: 10.1093/geroni/igy023.1062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
| | - K Kim
- University of Massachusetts Boston
| | - M Huo
- The University of Texas at Austin
| | - S Zarit
- Pennsylvania State University
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12
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Fingerman K, Huo M. SOCIAL INTEGRATION IN DAILY LIFE: A PROXY FOR PHYSICAL ACTIVITY. Innov Aging 2018. [DOI: 10.1093/geroni/igy023.3187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- K Fingerman
- The University of Texas at Austin, Austin, Texas, United States
| | - M Huo
- The University of Texas at Austin, Austin, TX, USA
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13
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Huo M, Graham JL, Fingerman K. DOES GENDER MATTER? EMPATHY AND OLDER ADULTS’ HELPING BEHAVIORS IN A DAILY CONTEXT. Innov Aging 2018. [DOI: 10.1093/geroni/igy023.1264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- M Huo
- Human Development and Family Science, University of Texas-Austin, Austin, Texas, United States
| | - J L Graham
- Human Development and Family Sciences, University of Texas-Austin, Austin, TX, USA
| | - K Fingerman
- Human Development and Family Sciences, University of Texas-Austin, Austin, TX, USA
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Abstract
Summary
Objectives:
In this paper, we present a unified electrodynamic heart model that permits simulations of the body surface potentials generated by the heart in motion. The inclusion of motion in the heart model significantly improves the accuracy of the simulated body surface potentials and therefore also the 12-lead ECG.
Methods:
The key step is to construct an electromechanical heart model. The cardiac excitation propagation is simulated by an electrical heart model, and the resulting cardiac active forces are used to calculate the ventricular wall motion based on a mechanical model. The source-field point relative position changes during heart systole and diastole. These can be obtained, and then used to calculate body surface ECG based on the electrical heart-torso model.
Results:
An electromechanical biventricular heart model is constructed and a standard 12-lead ECG is simulated. Compared with a simulated ECG based on the static electrical heart model, the simulated ECG based on the dynamic heart model is more accordant with a clinically recorded ECG, especially for the ST segment and T wave of a V1-V6 lead ECG. For slight-degree myocardial ischemia ECG simulation, the ST segment and T wave changes can be observed from the simulated ECG based on a dynamic heart model, while the ST segment and T wave of simulated ECG based on a static heart model is almost unchanged when compared with a normal ECG.
Conclusions:
This study confirms the importance of the mechanical factor in the ECG simulation. The dynamic heart model could provide more accurate ECG simulation, especially for myocardial ischemia or infarction simulation, since the main ECG changes occur at the ST segment and T wave, which correspond with cardiac systole and diastole phases.
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Huo M, Gorayski P, Poulsen M, Thompson K, Pinkham M. Evidence-based Peer Review for Radiation Therapy – Updated Review of the Literature with a Focus on Tumour Subsite and Treatment Modality. Clin Oncol (R Coll Radiol) 2017; 29:680-688. [DOI: 10.1016/j.clon.2017.04.038] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2016] [Revised: 03/30/2017] [Accepted: 04/06/2017] [Indexed: 12/16/2022]
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Huo M, Kim K, Zarit S, Fingerman K. DOES CLOSENESS MATTER?: PARENTS’ EXPERIENCES WITH CHILDREN SUFFERING PROBLEMS AND DAILY WELL-BEING. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.1863] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- M. Huo
- University of Texas at Austin, Austin, Texas,
| | - K. Kim
- University of Massachusetts Boston, Boston, Massachusetts,
| | - S. Zarit
- The Pennsylvania State University, University Park, Pennsylvania
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17
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Fingerman K, Huo M, Kim K, Birditt K. GENERATIONAL DIFFERENCES IN PERCEPTIONS OF SUPPORT EXCHANGES. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.2200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- K.L. Fingerman
- Human Development, The University of Texas at Austin, Austin, Texas,
| | - M. Huo
- Human Development, The University of Texas at Austin, Austin, Texas,
| | - K. Kim
- University of Massachusetts, Boston, Massachusetts
| | - K. Birditt
- University of Michigan, Ann Arbor, Michigan,
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Graham J, Huo M, Kim K, Birditt K, Zarit S, Fingerman K. MIDLIFE ADULTS’ SUPPORT TO PARENTS AND CHILDREN: IMPLICATIONS FOR DIURNAL CORTISOL RHYTHMS. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.5145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- J. Graham
- University of Texas-Austin, Austin, Texas,
| | - M. Huo
- University of Texas-Austin, Austin, Texas,
| | - K. Kim
- University of Massachusetts-Boston, Boston, Massachusetts,
| | - K. Birditt
- University of Michigan, Ann Arbor, Michigan,
| | - S. Zarit
- Pennsylvania State University, State College, Pennsylvania
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Soromou LW, Zhang Y, Cui Y, Wei M, Chen N, Yang X, Huo M, Baldé A, Guan S, Deng X, Wang D. Subinhibitory concentrations of pinocembrin exert anti-Staphylococcus aureus activity by reducing α-toxin expression. J Appl Microbiol 2013; 115:41-9. [PMID: 23594163 DOI: 10.1111/jam.12221] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2013] [Revised: 03/13/2013] [Accepted: 03/20/2013] [Indexed: 11/29/2022]
Abstract
AIMS Natural products have been used as potentially important sources of novel antibacterials in combating pathogenic Staphylococcus aureus isolates, a major problem around the world. In this study, we aimed to investigate the antibacterial effects of pinocembrin (PNCB) against Staph. aureus pneumonia in a murine model and its influence on the production of Staph. aureus α-haemolysin (Hla). METHODS AND RESULTS The in vitro activities of PNCB on α-haemolysin production were determined using haemolysis, Western blot and real-time RT-PCR assays. The viability and cytotoxicity assays were performed to evaluate the influence of PNCB on α-toxin-mediated injury of human alveolar epithelial cells. Moreover, through histopathologic analysis, we further determined the in vivo effects of PNCB on Staph. aureus pneumonia in a mouse model. In vitro, PNCB at low concentrations exhibited inhibitory activity against α-haemolysin production and attenuated α-haemolysin-mediated cell injury. Furthermore, the in vivo findings demonstrated that PNCB protected mice from Staph. aureus pneumonia. CONCLUSIONS We have provided new evidence of the effects of PNCB, which suggest that PNCB attenuated α-haemolysin-mediated cell injury and protected mice from Staph. aureus pneumonia. SIGNIFICANCE AND IMPACT OF THE STUDY The findings indicate that PNCB may be used as a basis for anti-Staphylococcus agent.
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Affiliation(s)
- L W Soromou
- Key Laboratory of Zoonosis, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, China
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Shi W, Zhao J, Yuan X, Wang S, Wang X, Huo M. Effects of Brønsted and Lewis Acidities on Catalytic Activity of Heteropolyacids in Transesterification and Esterification Reactions. Chem Eng Technol 2011. [DOI: 10.1002/ceat.201100206] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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21
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Locke S, Huo M. Post-treatment analgesia in chronic lower limb tendinopathies: Is there a difference between clinical responses following radial shockwave treatment and stretching? J Sci Med Sport 2011. [DOI: 10.1016/j.jsams.2011.11.094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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22
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Xia L, Huo M, Liu F, He B, Crozier S. Motion analysis of right ventricular wall based on an electromechanical biventricular model. Conf Proc IEEE Eng Med Biol Soc 2007; 2004:898-901. [PMID: 17271823 DOI: 10.1109/iembs.2004.1403304] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Based on our previously developed electrical heart model, an electromechanical biventricular model, which couples the electrical property and mechanical property of the heart, was constructed and the right ventricular wall motion and deformation was simulated using this model. The model was developed on the basis of composite material theory and finite element method. The excitation propagation was simulated by electrical heart model, and the resultant active forces were used to study the ventricular wall motion during systole. The simulation results show that: (1) The right ventricular free wall moves towards the septum, and at the same time, the base and middle of free wall move towards the apex, which reduce the volume of right ventricle; (2) The minimum principle strain (E3) is largest at the apex, then at the middle of free wall, and its direction is in the approximate direction of epicardial muscle fibers. These results are in good accordance with solutions obtained from MR tagging images. It suggests that such electromechanical biventricular model can be used to assess the mechanical function of two ventricles.
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Affiliation(s)
- L Xia
- Dept. of Biomed. Eng., Zhejiang Univ., Hangzhou, China
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23
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Xia L, Huo M, Wei Q, Liu F, Crozier S. Electrodynamic heart model construction and ECG simulation. Methods Inf Med 2006; 45:564-73. [PMID: 17019512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
OBJECTIVES In this paper, we present a unified electrodynamic heart model that permits simulations of the body surface potentials generated by the heart in motion. The inclusion of motion in the heart model significantly improves the accuracy of the simulated body surface potentials and therefore also the 12-lead ECG. METHODS The key step is to construct an electromechanical heart model. The cardiac excitation propagation is simulated by an electrical heart model, and the resulting cardiac active forces are used to calculate the ventricular wall motion based on a mechanical model. The source-field point relative position changes during heart systole and diastole. These can be obtained, and then used to calculate body surface ECG based on the electrical heart-torso model. RESULTS An electromechanical biventricular heart model is constructed and a standard 12-lead ECG is simulated. Compared with a simulated ECG based on the static electrical heart model, the simulated ECG based on the dynamic heart model is more accordant with a clinically recorded ECG, especially for the ST segment and T wave of a V1-V6 lead ECG. For slight-degree myocardial ischemia ECG simulation, the ST segment and T wave changes can be observed from the simulated ECG based on a dynamic heart model, while the ST segment and T wave of simulated ECG based on a static heart model is almost unchanged when compared with a normal ECG. CONCLUSIONS This study confirms the importance of the mechanical factor in the ECG simulation. The dynamic heart model could provide more accurate ECG simulation, especially for myocardial ischemia or infarction simulation, since the main ECG changes occur at the ST segment and T wave, which correspond with cardiac systole and diastole phases.
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Affiliation(s)
- L Xia
- Department of Biomedical Engineering, Zhejiang University, Hangzhou 310027, China.
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24
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Nicol K, Shan G, Huo M, Michael F, Polus M. Validation of a new hydraulic cushioning element for shoes. J Biomech 1994. [DOI: 10.1016/0021-9290(94)91019-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Shan G, Huo M. A low-cost measuring method for body shape. J Biomech 1994. [DOI: 10.1016/0021-9290(94)91249-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Huo M, Shan G. Analysis of backward pedalling utilising 2-component measuring pedals. J Biomech 1994. [DOI: 10.1016/0021-9290(94)90987-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Buly RL, Huo M, Root L, Binzer T, Wilson PD. Total hip arthroplasty in cerebral palsy. Long-term follow-up results. Clin Orthop Relat Res 1993:148-53. [PMID: 8222418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Patients with cerebral palsy frequently develop coxarthrosis after acquired hip dislocation or dysplasia. Nineteen total hip arthroplasties (THA) were performed in 18 patients with cerebral palsy and end-stage hip degeneration. The average age at arthroplasty was 30 years (range, 16-52 years). All components were cemented, and four hips required bone graft augmentation of the deficient acetabulum. Spica casts were used in 16 of 18 patients to minimize the incidence of dislocation and trochanteric nonunion. The average follow-up time was ten years (range, three to 17 years). Seventeen of 18 patients (94%) had pain relief and improved function after arthroplasty. One stem loosened at three years, and one acetabular component loosened at 15 years. One stem and one acetabular component were revised for malposition. Survivorship analysis was 95% at ten years for loosening and 86% with removal for any reason. Total hip arthroplasty can provide long-term relief and improved function in cerebral palsy patients with severe coxarthrosis.
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Affiliation(s)
- R L Buly
- Hospital for Special Surgery, New York, New York
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