Dr. Michael  Stevenson  Phd image

Dr. Michael Stevenson Phd

11550 Indian Hills Rd Suite 291
Mission Hills CA 91345
818 610-0996
Medical School: Other - Unknown
Accepts Medicare: No
Participates In eRX: No
Participates In PQRS: No
Participates In EHR: No
License #: PSY6915
NPI: 1780793810
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A Cross-Sectional Study Demonstrating Increased Serum Amyloid A Related Inflammation in High-Density Lipoproteins from Subjects with Type 1 Diabetes Mellitus and How This Association Was Augmented by Poor Glycaemic Control. - Journal of diabetes research
Inflammatory atherosclerosis is increased in subjects with type 1 diabetes mellitus (T1DM). Normally high-density lipoproteins (HDL) protect against atherosclerosis; however, in the presence of serum amyloid-A- (SAA-) related inflammation this property may be reduced. Fasting blood was obtained from fifty subjects with T1DM, together with fifty age, gender and BMI matched control subjects. HDL was subfractionated into HDL2 and HDL3 by rapid ultracentrifugation. Serum-hsCRP and serum-, HDL2-, and HDL3-SAA were measured by ELISAs. Compared to control subjects, SAA was increased in T1DM subjects, nonsignificantly in serum (P = 0.088), and significantly in HDL2(P = 0.003) and HDL3(P = 0.005). When the T1DM group were separated according to mean HbA1c (8.34%), serum-SAA and HDL3-SAA levels were higher in the T1DM subjects with HbA1c ≥ 8.34%, compared to when HbA1c was <8.34% (P < 0.05). Furthermore, regression analysis illustrated, that for every 1%-unit increase in HbA1c, SAA increased by 20% and 23% in HDL2 and HDL3, respectively, independent of BMI. HsCRP did not differ between groups (P > 0.05). This cross-sectional study demonstrated increased SAA-related inflammation in subjects with T1DM that was augmented by poor glycaemic control. We suggest that SAA is a useful inflammatory biomarker in T1DM, which may contribute to their increased atherosclerosis risk.
Neurology assessment by objective structured video examination (OSVE). - The clinical teacher
The ability to carry out a neurological examination and make an appropriate differential diagnosis is one of the mainstays of our final Bachelor of Medicine (MB) exam; however, with the introduction of objective structured clinical examinations (OSCEs) it has become impossible to arrange for adequate numbers of suitable real patients to participate in the exam.It is vital that newly qualified doctors can perform a basic neurological examination, interpret the physical signs and formulate a differential diagnosis. It is vital that newly qualified doctors can perform a basic neurological examination INNOVATION: Since 2010 we have introduced an objective structured video examination (OSVE) of a neurological examination of a real patient as part of our final MB OSCE exam. The students view clips of parts of the examination process. They answer questions on the signs that are demonstrated and formulate a differential diagnosis.This type of station is logistically a lot easier to organise than a large number of real patients at different examination sites. The featured patients have clearly demonstrated signs and, as every student sees the same patient, are perfectly standardised. It is highly acceptable to examiners and performed well as an assessment tool. There are, however, certain drawbacks in that we are not examining the student's examination technique or their interaction with the patient. Also, certain signs, in particular the assessment of muscle tone and power, are more difficult for a student to estimate in this situation.© 2015 John Wiley & Sons Ltd.
Stabilization of Cu(i) for binding and calorimetric measurements in aqueous solution. - Dalton transactions (Cambridge, England : 2003)
Conditions have been developed for the comproportionation reaction of Cu(2+) and copper metal to prepare aqueous solutions of Cu(+) that are stabilized from disproportionation by MeCN and other Cu(+)-stabilizing ligands. These solutions were then used in ITC measurements to quantify the thermodynamics of formation of a set of Cu(+) complexes (Cu(I)(MeCN)3(+), Cu(I)Me6Trien(+), Cu(I)(BCA)2(3-), Cu(I)(BCS)2(3-)), which have stabilities ranging over 15 orders of magnitude, for their use in binding and calorimetric measurements of Cu(+) interaction with proteins and other biological macromolecules. These complexes were then used to determine the stability and thermodynamics of formation of a 1 : 1 complex of Cu(+) with the biologically important tri-peptide glutathione, GSH. These results identify Me6Trien as an attractive Cu(+)-stabilizing ligand for calorimetric experiments, and suggest that caution should be used with MeCN to stabilize Cu(+) due to its potential for participating in unquantifiable ternary interactions.
A randomized clinical trial of ascorbic acid in open abdominal aortic aneurysm repair. - Intensive care medicine experimental
Open AAA repair is associated with ischaemia-reperfusion injury where systemic inflammation and endothelial dysfunction can lead to multiple organ injury including acute lung injury. Oxidative stress plays a role that may be inhibited by ascorbic acid.A double blind, allocation concealed, randomized placebo-controlled trial was performed to test the hypothesis that a single bolus dose (2g) of intra-operative parenteral ascorbic acid would attenuate biomarkers of ischaemia-reperfusion injury in patients undergoing elective open AAA repair.Thirty one patients completed the study; 18 received placebo and 13 ascorbic acid. Groups were comparable demographically. Open AAA repair caused an increase in urinary Albumin:Creatinine Ratio (ACR) as well as plasma IL-6 and IL-8. There was a decrease in exhaled breath pH and oxygenation. Lipid hydroperoxides were significantly higher in the ascorbic acid group following open AAA repair. There were no other differences between the ascorbic acid or placebo groups up to 4 hours after removal of the aortic clamping.Open AAA repair caused an increase in markers of systemic endothelial damage and systemic inflammation. Administration of 2g parenteral ascorbic acid did not attenuate this response and with higher levels of lipid hydroperoxides post-operatively a pro-oxidant effect could not be excluded.ISRCTN27369400.
To assess the effect of anti-vascular endothelial growth factor treatment on visual acuity outcome in patients with neovascular age-related macular degeneration presenting with very low vision.Retrospective analysis of electronic patient care record of 420 eyes treated with ranibizumab between March 2010 and June 2013. The authors classified the extracted sample into 3 categories based on the initial best-corrected visual acuity (BCVA) as measured on the Early Treatment Diabetic Retinopathy Study charts: 0 to 35 letters, 36 to 69 letters, and ≥70 letters. Best BCVA achieved in Year 1, and average BCVA over 36 months was computed. The neovascular lesion type, area of lesion, the presence or absence of hemorrhage, retinal pigment epithelium tear, and atrophy were systematically graded as was extent of fibrosis on a categorical scale of 0 to 4. Regression analysis was performed with the best BCVA achieved in Year 1 as the outcome variable and initial BCVA, person, and lesion characteristics as explanatory variables.The mean change in BCVA from the initial visit to the best-attained BCVA during Year 1 was highly statistically significant with an improvement of 9.95 letters. The improvement from initial BCVA to average BCVA over 36 months was 4.01 letters. Regression analysis identified atrophy and fibrosis as predictors of best BCVA, with the model having an r of 0.71.Our study supports the use of anti-vascular endothelial growth factor agents even in eyes with low visual acuity particularly when fibrosis and atrophy are absent and suggests algorithms to predict outcome for combinations of visual acuity and lesion characteristics across the full visual acuity range.
Primary intracranial Ewing's sarcoma with unusual features. - International journal of clinical and experimental pathology
Pediatric primary "small round blue cell" tumors in the CNS represent several entities, some more common than others. Ewing sarcoma/peripheral primitive neuroectodermal tumor (ES/pPNET) is rare and must be distinguished from other tumors such as medulloblastoma [1, 2], atypical rhabdoid/teratoid tumor, ependymomal tumors, metastatic sarcomas, hematologic malignancies, and other mimics. Although therapy for ES/pPNET is effective, it brings severe side effects, including cardiac toxicity, making correct recognition important [3]. As small blue cell tumors look similar, diagnosis often depends on special stains, immunohistochemistry, and molecular techniques. While the combination of membranous immunohistochemical reactivity for CD99 with cytoplasmic glycogen provides effective screening, demonstration of characteristic translocations of EWSR1 (chromosome 22) or FUS (chromosome 16) by fluorescent in situ hybridization (FISH) can confirm the diagnosis. We are reporting three primary ES/pPNET of the CNS, two of which occurred in children. While the adult case demonstrates the classic histopathology, the two pediatric cases have histopathology that significantly deviates from the usual. One is suggestive of a primary sarcoma, and the other mimics an ependymoma, but all three cases are confirmed with FISH. These observations suggest that primary ES in the CNS may have histology different from the classic morphology and a high index of suspicion should be maintained in order to make the correct diagnosis. A search of the literature suggests that these tumors are most frequently seen in children and young adults. Imaging often shows a supratentorial enhancing mass that touches the leptomeninges. Survival over three years is good but long term prognosis is unknown [3, 4].
The relevance of the public-private partnership paradigm to the prevention of diet-associated non-communicable diseases in wealthy countries. - Global public health
The public-private partnership (PPP) paradigm emerged as a form of global health governance in the mid-1990s to overcome state and market failures constraining access to essential medicines among populations with limited purchasing power in low- and middle-income countries. PPPs are now ubiquitous across the development spectrum. Yet while the narrative that the private sector must be engaged if complex health challenges are to be overcome is now dominant in development discourse, it does not yet appear to be shaping government approaches to addressing health inequalities within high-income welfare states such as Canada. This is significant as both the actions and inactions of firms factor heavily into why low-income Canadians face a disproportionate risk of developing diet-associated chronic diseases, such as type II diabetes. In the same ways PPPs have been an effective policy tool for strengthening public health in poor countries, this paper illuminates how the PPP model may have utility for mitigating poverty-associated food insecurity giving rise to diet-associated non-communicable diseases within the context of wealthy states.
Plasma Complement factor H in Alzheimer's Disease. - Journal of Alzheimer's disease : JAD
Biomarkers for Alzheimer's disease (AD) should meet several criteria, including simplicity of testing. Inappropriate activation of the complement cascade has been implicated in the pathogenesis of AD. Complement factor H (CFH) is a regulator of the cascade, but studies on plasma CFH levels in AD have provided mixed results. This study compared plasma CFH levels in 317 AD cases with 254 controls using an immunodiffusion assay. The sample had an 80% power to detect a difference of 23 mg/L between cases and controls, but no difference was evident. Plasma CFH may not be a suitable biomarker for AD.
Features of intraventricular tanycytic ependymoma: report of a case and review of literature. - International journal of clinical and experimental pathology
Tanycytic ependymoma is the rarest variant of ependymoma and occurs primarily in the spinal cord. Intracranial cases are even rarer. Only 9 ventricular and 5 subcortical tanycytic ependymoma have been reported in the literature. Amongst the 9 ventricular cases, only one tumor arose from the third ventricle. We report here another case of tanycytic ependymoma arising from the third ventricle completed with immunohistochemical, ultrastructural, and molecular pathology study. The patient was a 44 year-old male who presented with headache, nausea and visual disturbances of a few months duration. Neuroradiological findings showed a well-defined mass arising from the posterolateral wall of third ventricle. Histologically the tumor was composed of monotonous spindle cells arranged in fascicles without definitive perivascular rosettes. The tumor cells were diffusely positive for glial fibrillary acidic protein and epithelial membrane antigen, showed faint immunoreactivity for synaptophysin but were negative for neurofilament proteins and Ki-67 was less than 1%. Molecular studies showed absence of isocitrate dehydrogenase gene 1 and 2 mutation. A diagnosis of tanycytic ependymoma (TE) was made. From literature review with our current case included, intraventricular tanycytic ependymomas ranged from 1.8 to 4.0 cm. The age of patients ranged from 3.5 to 75 years with a mean age of 37.5 and a male predominance. The tumors occurred as well-defined, solitary ventricular mass without significant peritumoral edema with or without cystic changes. Histopathology and immunohistochemical profile are rather similar among different tumors. The immediate to short term outcome is excellent but long term follow up data is lacking.
Genome-wide DNA methylation study identifies significant epigenomic changes in osteoarthritic cartilage. - Arthritis & rheumatology (Hoboken, N.J.)
To perform a genome-wide DNA methylation study to identify DNA methylation changes in osteoarthritic (OA) cartilage tissue.The contribution of differentially methylated genes to OA pathogenesis was assessed by bioinformatic analysis, gene expression analysis, and histopathologic severity correlation. Genome-wide DNA methylation profiling of >485,000 methylation sites was performed on eroded and intact cartilage from within the same joint of 24 patients undergoing hip arthroplasty for OA. Genes with differentially methylated CpG sites were analyzed to identify overrepresented gene ontologies, pathways, and upstream regulators. The messenger RNA expression of a subset of differentially methylated genes was analyzed by reverse transcription-polymerase chain reaction. Histopathology was graded by modified Mankin score and correlated with DNA methylation.We identified 550 differentially methylated sites in OA. Most (69%) were hypomethylated and enriched among gene enhancers. We found differential methylation in genes with prior links to OA, including RUNX1, RUNX2, DLX5, FURIN, HTRA1, FGFR2, NFATC1, SNCAIP, and COL11A2. Among these, RUNX1, HTRA1, FGFR2, and COL11A2 were also differentially expressed. Furthermore, we found differential methylation in approximately one-third of known OA susceptibility genes. Among differentially methylated genes, upstream regulator analysis showed enrichment of TGFB1 (P = 4.40 × 10(-5) ) and several microRNAs including miR-128 (P = 4.48 × 10(-13) ), miR-27a (P = 4.15 × 10(-12) ), and miR-9 (P = 9.20 × 10(-10) ). Finally, we identified strong correlations between 20 CpG sites and the histologic Mankin score in OA.Our data implicate epigenetic dysregulation of a host of genes and pathways in OA, including a number of OA susceptibility genes. Furthermore, we identified correlations between CpG methylation and histologic severity in OA.Copyright © 2014 by the American College of Rheumatology.

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