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Willson A, Leipsic J, Gurvitch R, Toggweiler S, Binder R, Wood D, Ye J, Cheung A, Webb J. Late Structural Integrity of Balloon Expandable Stents used for Transcatheter Aortic Valve Replacement (TAVR): Assessment by Multi Detector Computerised Tomography (MDCT). Heart Lung Circ 2011. [DOI: 10.1016/j.hlc.2011.05.331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Willson A, Webb J, Gurvitch R, Binder R, Toggweiler S, Wood D, Ye J, Cheung A, Leipsic J. Post Implantation Geometry of the Edwards SAPIEN XT Valve as Assessed by Multidetector Computerised Tomography. Heart Lung Circ 2011. [DOI: 10.1016/j.hlc.2011.05.353] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Gurvitch R, Willson A, Rodes-Cabau J, Bagur R, Toggweiler S, Wood D, Cheung A, Ye J, Lee M, Dumont E, Webb J. Transcatheter Aortic Valve Implantation—Multicentre Study Evaluating the Clinical Outcomes of Patients with PARTNER Trial Exclusions. Heart Lung Circ 2011. [DOI: 10.1016/j.hlc.2011.05.378] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Gurvitch R, Wood DA, Tay EL, Leipsic J, Ye J, Lichtenstein SV, Thompson CR, Carere RG, Wijesinghe N, Nietlispach F, Boone RH, Lauck S, Cheung A, Webb JG. Transcatheter aortic valve implantation: durability of clinical and hemodynamic outcomes beyond 3 years in a large patient cohort. Circulation 2010; 122:1319-27. [PMID: 20837893 DOI: 10.1161/circulationaha.110.948877] [Citation(s) in RCA: 212] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
BACKGROUND Although short- and medium-term outcomes after transcatheter aortic valve implantation are encouraging, long-term data on valve function and clinical outcomes are limited. METHODS AND RESULTS Consecutive high-risk patients who had been declined as surgical candidates because of comorbidities but who underwent successful transcatheter aortic valve implantation with a balloon-expandable valve between January 2005 and December 2006 and survived past 30 days were assessed. Clinical, echocardiographic, and computed tomographic follow-up examinations were performed. Seventy patients who underwent successful procedures and survived longer than 30 days were evaluated at a minimum follow-up of 3 years. At a median follow-up of 3.7 years (interquartile range 3.4 to 4.3 years), survival was 57%. Survival at 1, 2, and 3 years was 81%, 74%, and 61%, respectively. Freedom from reoperation was 98.5% (1 patient with endocarditis). During this early procedural experience, 11 patients died within 30 days, and 8 procedures were unsuccessful. When these patients were included, overall survival was 51%. Transaortic pressure gradients increased from 10.0 mm Hg (interquartile range 8.0 to 12.0 mm Hg) immediately after the procedure to 12.1 mm Hg (interquartile range 8.6 to 16.0 mm Hg) after 3 years (P=0.03). Bioprosthetic valve area decreased from a mean of 1.7±0.4 cm(2) after the procedure to 1.4±0.3 cm(2) after 3 years (P<0.01). Aortic incompetence after implantation was trivial or mild in 84% of cases and remained unchanged or improved over time. There were no cases of structural valvular deterioration, stent fracture, deformation, or valve migration. CONCLUSIONS Transcatheter aortic valve implantation demonstrates good medium- to long-term durability and preserved hemodynamic function, with no evidence of structural failure. The procedure appears to offer an adequate and lasting resolution of aortic stenosis in selected patients.
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Abstract
Hip pain is a common paediatric presentation and is potentially serious. While hip pain can be attributed to primary hip pathology, the hip area is also a common site for referred pain. This often poses a diagnostic challenge particularly in the young child who may not verbalise the point of pain and may not report an injury. Differential diagnoses for paediatric hip joint pain range from fracture, transient synovitis, septic arthritis with or without osteomyelitis, juvenile idiopathic arthritis (JIA, previously juvenile rheumatoid arthritis JRA), Legg-Calve-Perthes' disease (LCP), slipped capital femoral epiphysis (SCFE) to haemarthrosis in patient with a clotting disorder. Referred pain from abdominal pathology, for example; appendicitis, psoas abscess or haematoma should also be considered. The evaluation and management of hip pain requires a thorough history and physical examination. A radiograph is usually indicated to rule out any bony injury. Septic arthritis is a medical emergency requiring urgent surgical as well as medical treatment. Ultrasound of the hip joint plays a role in helping to differentiate which hips require early intervention and to guide a needle aspiration of joint fluid if indicated. In this article, we aim to review the anatomy of the hip, techniques in ultrasonographic examination and some common pathologies in the paediatric hip.
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Sottocornola R, Royer C, Vives V, Tordella L, Zhong S, Wang Y, Ratnayaka I, Shipman M, Cheung A, Gaston-Massuet C, Ferretti P, Molnár Z, Lu X. ASPP2 binds Par-3 and controls the polarity and proliferation of neural progenitors during CNS development. Dev Cell 2010; 19:126-37. [PMID: 20619750 DOI: 10.1016/j.devcel.2010.06.003] [Citation(s) in RCA: 98] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2009] [Revised: 03/08/2010] [Accepted: 05/29/2010] [Indexed: 11/19/2022]
Abstract
Cell polarity plays a key role in the development of the central nervous system (CNS). Interestingly, disruption of cell polarity is seen in many cancers. ASPP2 is a haplo-insufficient tumor suppressor and an activator of the p53 family. In this study, we show that ASPP2 controls the polarity and proliferation of neural progenitors in vivo, leading to the formation of neuroblastic rosettes that resemble primitive neuroepithelial tumors. Consistent with its role in cell polarity, ASPP2 influences interkinetic nuclear migration and lamination during CNS development. Mechanistically, ASPP2 maintains the integrity of tight/adherens junctions. ASPP2 binds Par-3 and controls its apical/junctional localization without affecting its expression or Par-3/aPKC lambda binding. The junctional localization of ASPP2 and Par-3 is interdependent, suggesting that they are prime targets for each other. These results identify ASPP2 as a regulator of Par-3, which plays a key role in controlling cell proliferation, polarity, and tissue organization during CNS development.
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Gurvitch R, Wood D, Leipsic J, Tay E, Nietlispach F, Wijesinghe N, Cheung A, Lichtenstein S, Munt B, Webb J. Utility of Multislice Computed Tomography in Predicting the Correct Angiographic Angle for Deployment of Transcatheter Aortic Valves. Heart Lung Circ 2010. [DOI: 10.1016/j.hlc.2010.06.491] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Gurvitch R, Tay E, Wood D, Leipsic J, Lichtenstein S, Thompson C, Carere R, Wijesinghe N, Nietlispach F, Boone R, Cheung A, Webb J. Transcatheter Aortic Valve Implantation: Durability of Clinical and Haemodynamic Outcomes Beyond Three Years in a Large Patient Cohort. Heart Lung Circ 2010. [DOI: 10.1016/j.hlc.2010.06.1038] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Tay E, Gurvitch R, Wijesinghe N, Nietlispach F, Wood D, Ye J, Cheung A, Carere R, Lichtenstein S, Thompson C, Webb J. Cerebrovascular Events Following Transcatheter Aortic Valve Replacement—Incidence, Predictors and Timing of Events. Heart Lung Circ 2010. [DOI: 10.1016/j.hlc.2010.06.956] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Gurvitch R, Tay E, Nietlispach F, Wijesinghe N, Wood D, Cheung A, Thompson C, Ye J, Lichtenstein S, Webb J. Transcatheter Aortic Valve Implantation—Single Centre Outcomes From the First 270 High-Risk Patients. Heart Lung Circ 2010. [DOI: 10.1016/j.hlc.2010.06.1036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Drmanac R, Sparks AB, Callow MJ, Halpern AL, Burns NL, Kermani BG, Carnevali P, Nazarenko I, Nilsen GB, Yeung G, Dahl F, Fernandez A, Staker B, Pant KP, Baccash J, Borcherding AP, Brownley A, Cedeno R, Chen L, Chernikoff D, Cheung A, Chirita R, Curson B, Ebert JC, Hacker CR, Hartlage R, Hauser B, Huang S, Jiang Y, Karpinchyk V, Koenig M, Kong C, Landers T, Le C, Liu J, McBride CE, Morenzoni M, Morey RE, Mutch K, Perazich H, Perry K, Peters BA, Peterson J, Pethiyagoda CL, Pothuraju K, Richter C, Rosenbaum AM, Roy S, Shafto J, Sharanhovich U, Shannon KW, Sheppy CG, Sun M, Thakuria JV, Tran A, Vu D, Zaranek AW, Wu X, Drmanac S, Oliphant AR, Banyai WC, Martin B, Ballinger DG, Church GM, Reid CA. Human Genome Sequencing Using Unchained Base Reads on Self-Assembling DNA Nanoarrays. Science 2009; 327:78-81. [DOI: 10.1126/science.1181498] [Citation(s) in RCA: 962] [Impact Index Per Article: 64.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Schooling CM, Wong LC, Chau J, Cheung A, Ho A, McGhee SM. Cost-effectiveness of influenza vaccination for elderly people living in the community. Hong Kong Med J 2009; 15 Suppl 6:44-47. [PMID: 19801718] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/28/2023] Open
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Potter A, Bezjak A, Levin W, McLean M, Garraway C, Lau M, Zurawel-Balaura L, Cheung A, Ma C, Wong R. 126 FACTORS INFLUENCING DOSE/FRACTIONATION CHOICES FOR PALLIATION OF BONE METASTASES. Radiother Oncol 2009. [DOI: 10.1016/s0167-8140(12)72513-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Wali R, Iyengar M, Chartyan D, Lukas M, Cooper C, Cheung A. A Meta-Analysis of Two Double-Blind, Placebo Controlled, Randomized Trials to Evaluate the Efficacy and Safety of Carvedilol Treatment in Non-Dialysis Dependent Chronic Kidney Disease Patients with Symptomatic or Asymptomatic Systolic Heart Failure. J Card Fail 2009. [DOI: 10.1016/j.cardfail.2009.06.043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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140
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Kaan A, Kealy J, Chow B, Lemarche Y, Cheung A. 594: Is a Short-Term Microaxial VAD More Cost-Effective Than ECMO for Severe Cardiogenic Shock? J Heart Lung Transplant 2009. [DOI: 10.1016/j.healun.2008.11.601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Romero CDJ, Britanova O, Cheung A, Molnár Z, Tarabykin V. [P1.44]: Satb2 and Ctip2 genes in the control of neocortical connectivity. Int J Dev Neurosci 2008. [DOI: 10.1016/j.ijdevneu.2008.09.094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
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Panju A, Breunis H, Cheung A, Duff-Canning S, Fleshner N, Krahn M, Naglie G, Tomlinson G, Warde P, Alibhai S. Management of decreased bone mineral density (BMD) in men starting androgen deprivation therapy (ADT) for prostate cancer. Crit Rev Oncol Hematol 2008. [DOI: 10.1016/s1040-8428(08)70108-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
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Lau JTF, Lau M, Cheung A, Tsui HY. A randomized controlled study to evaluate the efficacy of an Internet-based intervention in reducing HIV risk behaviors among men who have sex with men in Hong Kong. AIDS Care 2008; 20:820-8. [DOI: 10.1080/09540120701694048] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Britanova O, de Juan Romero C, Cheung A, Kwan KY, Schwark M, Gyorgy A, Vogel T, Akopov S, Mitkovski M, Agoston D, Sestan N, Molnár Z, Tarabykin V. Satb2 is a postmitotic determinant for upper-layer neuron specification in the neocortex. Neuron 2008; 57:378-92. [PMID: 18255031 DOI: 10.1016/j.neuron.2007.12.028] [Citation(s) in RCA: 487] [Impact Index Per Article: 30.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2007] [Revised: 11/13/2007] [Accepted: 12/21/2007] [Indexed: 12/18/2022]
Abstract
Pyramidal neurons of the neocortex can be subdivided into two major groups: deep- (DL) and upper-layer (UL) neurons. Here we report that the expression of the AT-rich DNA-binding protein Satb2 defines two subclasses of UL neurons: UL1 (Satb2 positive) and UL2 (Satb2 negative). In the absence of Satb2, UL1 neurons lose their identity and activate DL- and UL2-specific genetic programs. UL1 neurons in Satb2 mutants fail to migrate to superficial layers and do not contribute to the corpus callosum but to the corticospinal tract, which is normally populated by DL axons. Ctip2, a gene required for the formation of the corticospinal tract, is ectopically expressed in all UL1 neurons in the absence of Satb2. Satb2 protein interacts with the Ctip2 genomic region and controls chromatin remodeling at this locus. Satb2 therefore is required for the initiation of the UL1-specific genetic program and for the inactivation of DL- and UL2-specific genes.
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Begum S, Emami N, Cheung A, Wilkins O, Der S, Hamel PA. Erratum: Cell type-specific regulation of distinct sets of gene targets by Pax3 and Pax3/FKHR. Oncogene 2008. [DOI: 10.1038/onc.2008.12] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Sawka AM, Gafni A, Boulos P, Beattie K, Papaioannou A, Cranney A, Hanley DA, Adachi JD, Cheung A, Papadimitropoulos EA, Thabane L. Could a policy of provision of hip protectors to elderly nursing home residents result in cost savings in acute hip fracture care? The case of Ontario, Canada. Osteoporos Int 2007; 18:819-27. [PMID: 17221294 DOI: 10.1007/s00198-006-0307-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/25/2006] [Accepted: 11/22/2006] [Indexed: 10/23/2022]
Abstract
UNLABELLED Hip fractures are an important problem in nursing homes. Hip protectors are external devices that decrease the risk of hip fracture in elderly nursing home residents. We estimated the overall healthcare cost savings from a hypothetical strategy of provision of hip protectors to elderly nursing home residents in Ontario, Canada. In a recent meta-analysis, we determined that a strategy of provision of hip protectors decreases the risk of hip fracture in nursing home residents. INTRODUCTION Our objective was to determine whether the provision of hip protectors to all Ontario nursing home residents aged > or =65 years could result in cost savings, stemming from reductions in initial hospitalizations for hip fracture. METHODS We conducted a cost analysis from a Ministry of Health perspective (one year cycle length). The efficacy of the intervention was estimated from a meta-analysis of randomized controlled trials. RESULTS A strategy of provision of hip protectors to all 60,775 elderly Ontario nursing home residents could result in an overall mean cost savings of 6.0 million Canadian dollars in one year (95% credibility interval, -26.4 million, 39.7 million), with a probability of cost savings of 0.63 (assuming no additional labor costs). In sensitivity analyses, decreasing hip protector price increased cost savings, whereas additional labor expenditures for application for hip protectors decreased cost savings. CONCLUSION In conclusion, if hip protectors can be provided to elderly Ontario nursing home residents without additional labor expenditures, there is a reasonable probability that such a strategy may result in healthcare cost savings.
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Cheung A, Zid Z, Hunt D, McIntyre J. The potential for dental plaque to protect against erosion using an in vivo-in vitro model--a pilot study. Aust Dent J 2006; 50:228-34. [PMID: 17016887 DOI: 10.1111/j.1834-7819.2005.tb00365.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND Tooth erosion is a problem for professional wine tasters (exogenous erosion from frequent exposure to wine acids) and for people with gastro oesophageal reflux disease (GORD) and bulimia who experience frequent reflux of gastric contents into the mouth (endogenous erosion from mainly HCl). The objective in this study was to determine whether plaque/pellicle could provide teeth with any protection from two common erosive acids, using an in vivo-in vitro technique. METHODS Tiles of human tooth enamel and root surfaces were prepared from six extracted, unerupted third molar teeth and sterilized. Mandibular stents were prepared for six volunteer subjects and the tiles bonded to the buccal flanges of these stents. They were worn initially for three days to permit a layer of pellicle and plaque to form over the tile surfaces, and for a further 10 days of experimentation. Following cleaning of the plaque/ pellicle layer from the tiles on the right side flange, all the tiles were submerged in either 0.06M HCl or white wine for an accumulated time of 600 and 1500 minutes, respectively. Depths of erosion were determined using light microscopy of sections of the enamel and root tiles. SEM of the lesion surfaces was carried out to investigate the nature of erosive damage and of plaque/pellicle remnants. RESULTS Retained plaque was found to significantly inhibit dental erosion on enamel, from contact with both HCl and wine, compared with that resulting following its removal. However, it was found to provide no significant protection on root surfaces. SEM analysis of the tile surfaces revealed marked etching of enamel on the cleaned surfaces, and considerable alteration to the appearance of remaining plaque and pellicle on most surfaces. CONCLUSION Within the limitations of numbers of specimens, dental plaque/pellicle provided a significant level of protection to tooth enamel against dental erosion from simulated gastric acids and from white wine, using an in vivo-in vitro model. It was unable to provide any significant protection to root surfaces from these erosive agents. Possible reasons for this difference are explored.
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Takada Y, Akakura N, Hoogland C, Takada YK, Liu F, Cheung A. ID: 058 The C-terminal globular domain of fibrinogen gamma chain suppresses angiogenesis and tumor growth. J Thromb Haemost 2006. [DOI: 10.1111/j.1538-7836.2006.00058.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Mavligit G, Kurzrock R, Cheung A, Gupta S, Madoff DC, Wallace M, Kim E, Curley SA, Hortobagyi GN, Camacho LH. Pilot study of regional hepatic intra-arterial (HIA) paclitaxel in patients (Pts) with breast carcinoma metastatic to the liver. J Clin Oncol 2006. [DOI: 10.1200/jco.2006.24.18_suppl.10626] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
10626 Background: Approximately 50% of pts with metastatic breast carcinoma develop hepatic involvement during the course of their disease. Their median survival is 1–14 months (mo). Systemic paclitaxel has good anti-tumor activity against breast carcinoma and is safe. We sought to prospectively determine the safety and anti-tumor activity of HIA paclitaxel therapy. Methods: Ten pts with breast carcinoma and dominant liver metastases received monthly inpatient 24 hr-continuous HIA infusions of paclitaxel at 200 mg/m2 through intra-arterial catheters placed via percutaneous transfemoral approach. WHO tumor assessment guidelines were used. Results: Nine pts enrolled in this study had infiltrating ductal carcinoma and their median age at the time of treatment was 51 years. The group had received a mean of 3.8 previous treatment regimens including adjuvant regimens. Therapy was well tolerated. Fifty-six courses were delivered. Mean hospital stay was 3 days. No procedure related complications were observed. Most common treatment related toxicities included leukopenia, fatigue, nausea, and vomiting. Three pts attained partial responses (50% decrease in tumors) lasting 6, 7, and 48 months whereas in 4 others disease stabilization lasted 5 to 9 mo. One pt underwent liver resection and remained NED for 48 mo. Eight pts had received prior systemic taxane therapy alone or in combination with other cytotoxics (3 adjuvant; 5 palliative). However, no association between previous taxane exposure and clinical efficacy of this regimen was not established. Conclusions: Hepatic arterial therapy with paclitaxel at this dose and schedule is safe and well tolerated and has reasonable anti-tumor activity against breast carcinoma involving the liver. Previous taxane exposure does not hamper the potential benefit of this approach. This regimen deserves further investigation alone or in combination with targeted strategies in patients with dominant liver involvement from breast carcinoma. No significant financial relationships to disclose.
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