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Dunckley M, Ahmed K, Said A, Raza M, Dighe S, Al-Temimi A. Variability in the presentation of complicated jejunal diverticulosis. JRSM Open 2023; 14:20542704231183247. [PMID: 37425033 PMCID: PMC10328167 DOI: 10.1177/20542704231183247] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/11/2023] Open
Abstract
Jejunal diverticulosis is a rare disease which normally presents for the first time with acute complications, often requiring surgical intervention. The diverticulae are acquired, occurring more commonly after middle age, but their aetiology is unclear. We discuss this condition in the context of four cases which presented to our hospital as emergencies over a five year period: small bowel obstruction, gastrointestinal haemorrhage, small bowel volvulus, and visceral perforation. Our aim is to encourage clinicians to include jejunal diverticular disease as a differential diagnosis in patients with abdominal symptoms.
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Affiliation(s)
- M.G. Dunckley
- Department of General Surgery, Dartford & Gravesham NHS Trust, Dartford, Kent, DA2 8DA, UK
| | - K. Ahmed
- Department of General Surgery, Dartford & Gravesham NHS Trust, Dartford, Kent, DA2 8DA, UK
| | - A. Said
- Department of General Surgery, Dartford & Gravesham NHS Trust, Dartford, Kent, DA2 8DA, UK
| | - M. Raza
- Department of General Surgery, Dartford & Gravesham NHS Trust, Dartford, Kent, DA2 8DA, UK
| | - S. Dighe
- Department of General Surgery, Dartford & Gravesham NHS Trust, Dartford, Kent, DA2 8DA, UK
| | - A. Al-Temimi
- Department of General Surgery, Dartford & Gravesham NHS Trust, Dartford, Kent, DA2 8DA, UK
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2
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Enners S, Gradl G, Kieble M, Iliescu O, Freudewald L, Said A, Schulz M. Increased Demand for Pharmaceutical Drugs Containing Potassium Iodide In Connection with the Russia-Ukraine Conflict. Pharmazie 2023; 78:17-19. [PMID: 37138408 DOI: 10.1691/ph.2023.2541] [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: 05/05/2023]
Abstract
The current conflict between Russia and Ukraine increased concerns in the German population of a release of radioactive substances, e.g.radioactive iodine. A high dose of potassium iodide (PI) may prevent accumulation of radioactive iodine in the thyroid gland. Therefore, the German government keeps a sufficient quantity of PI in stock for public supply in case of an emergency. We investigated ambulatory drug dispensing rates of PI and found that the total dispensing of PI (statutory health insurance (SHI), private health insurance (PHI), and overthe-counter (OTC)) increased by 106% from February to March 2022. Changes in PI dispensing were mainly due to an increase in OTC sales, where PI as an antidote showed a sevenfold increase from around 930 packages (February 2022) to 6,500 packages (March 2022), while SHI and PHI dispensing remained relatively low. Furthermore, we investigated whether these changes in dispensing raised the number of suspected adverse drug reactions (ADR). We found no increase of ADR reports related to the use of PI-containing medicinal products between February and September 2022, neither in our national pharmacovigilance nor in the European EudraVigilance database. The data suggest that the mere possibility of a nuclear disaster in Ukraine raised the demand of PI in Germany. Thus, timely and proactive information and reassurance of the public of supply reliability by the Government in a case of a nuclear emergency could be helpful in preventing potential drug shortages and unfounded concern.
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Affiliation(s)
- S Enners
- German Institute for Drug Use Evaluation (DAPI), Freie Universität Berlin, Berlin, Germany; German Institute for Drug Use Evaluation (DAPI), Heidestr. 7, 10557 Berlin, Germany;,
| | - G Gradl
- German Institute for Drug Use Evaluation (DAPI), Freie Universität Berlin, Berlin, Germany
| | - M Kieble
- German Institute for Drug Use Evaluation (DAPI), Freie Universität Berlin, Berlin, Germany
| | - O Iliescu
- Drug Commission of German Pharmacists (AMK), Freie Universität Berlin, Berlin, Germany
| | - L Freudewald
- Drug Commission of German Pharmacists (AMK), Freie Universität Berlin, Berlin, Germany
| | - A Said
- Drug Commission of German Pharmacists (AMK), Freie Universität Berlin, Berlin, Germany
| | - M Schulz
- German Institute for Drug Use Evaluation (DAPI), Freie Universität Berlin, Berlin, Germany; Drug Commission of German Pharmacists (AMK), Freie Universität Berlin, Berlin, Germany; Institute of Pharmacy, Freie Universität Berlin, Berlin, Germany; German Institute for Drug Use Evaluation (DAPI), Heidestr. 7, 10557 Berlin, Germany;,
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3
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Yu Q, Ahmed O, Gutti S, Iyer D, Angle J, Navuluri R, Lorenz J, Sellers E, Ahmed S, Said A, Wahoud W, Patel M. Abstract No. 579 Meta-Analysis of Transjugular Intrahepatic Portosystemic Shunt Creation with Intravascular Ultrasound Guidance. J Vasc Interv Radiol 2023. [DOI: 10.1016/j.jvir.2022.12.437] [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: 02/27/2023] Open
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4
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Chow H, Ling H, Chan E, Chung B, Then L, Pang I, Chan S, Khor H, Tan C, Oon Y, Koh K, Cham Y, Said A, Fong A, Ong T. Coronary artery calcification – distribution, extent and 1-year outcomes in patients with low to intermediate pre-test probability of coronary artery disease. Int J Cardiol 2022. [DOI: 10.1016/j.ijcard.2022.10.075] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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5
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Umesh S, Chow H, Ling H, Chung B, Then L, Pang I, Chen L, Bhavnani C, Tan C, Oon Y, Koh K, Cham Y, Fong A, Said A, Ong T. Association of Dutch lipid clinic network criteria with reduction in low-density lipoprotein cholesterol in patients with ST-elevation myocardial infarction. Int J Cardiol 2022. [DOI: 10.1016/j.ijcard.2022.10.058] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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6
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Khan RU, Khan M, Sohail A, Ullah R, Iqbal A, Ahmad B, Khan IU, Tariq A, Ahmad M, Said A, Ullah S, Ali A, Rahman MU, Zaman A, Bilal H. Efficacy of pentamidine-loaded chitosan nanoparticles as a novel drug delivery system for Leishmania tropica. Trop Biomed 2022; 39:511-517. [PMID: 36602209 DOI: 10.47665/tb.39.4.003] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The present study compares the in vitro effects of nanoparticles loaded pentamidine drug and conventional pentamidine on Leishmania tropica. Herein, pentamidine-loaded chitosan nanoparticles (PTN-CNPs) have been synthesized through an ionic gelation method with sodium tripolyphosphate (TPP). Next, the physical characteristics of PTN-CNPs were determined through the surface texture, zeta potential, in vitro drug release, drug loading content (DLC), and encapsulation efficacy (EE) and compared its efficacy with free pentamidine (PTN) drug against promastigotes and axenic amastigotes forms of L. tropica in vitro. The PTN-CNPs displayed a spherical shape having a size of 88 nm, an almost negative surface charge (-3.09 mV), EE for PTN entrapment of 86%, and in vitro drug release of 92% after 36 h. In vitro antileishmanial activity of PTN-CNPs and free PTN was performed against Leishmania tropica KWH23 promastigote and axenic amastigote using 3-(4, 5- dimethylthiazol-2-yl)-2, 5-diphenyletetrazolium bromide (MTT) assay. It was observed that the effect of PTN-CNPs and free PTN on both forms of the parasite was dose and time dependent. Free PTN presented low efficacy even at higher dose (40 µg/ml) with 25.6 ± 1.3 and 26.5 ±1.4 mean viability rate of the promastigotes and axenic amastigotes, respectively after 72 hrs incubation. While PTN-CNPs showed strong antileishmanial effects on both forms of parasite with 16 ± 0.4 and 19 ± 0.7 mean viability rate at the same higher concentration (40 µg/ml) after 72 hrs incubation. Half maximal inhibitory concentration (IC50) values of PTN-CNPs toward promastigotes and amastigotes were obtained as 0.1375 µg/ml and 0.1910 µg/ml, respectively. In conclusion, PTN-CNPs effectively inhibited both forms of the L. tropica; however, its effect was more salient on promastigotes. This data indicates that the PTN-CNPs act as a target drug delivery system. However, further research is needed to support its efficacy in animal and human CL.
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Affiliation(s)
- R U Khan
- Institute of Pathology and Diagnostic Medicine, Khyber Medical University, Peshawar, Pakistan
| | - M Khan
- Institute of Pathology and Diagnostic Medicine, Khyber Medical University, Peshawar, Pakistan
| | - A Sohail
- Institute of Pathology and Diagnostic Medicine, Khyber Medical University, Peshawar, Pakistan
| | - R Ullah
- Department of Dairy Technology, Faculty of Veterinary and Animal Sciences, University of Agriculture Dera Ismail Khan, Pakistan
| | - A Iqbal
- Faculty of Veterinary and Animal Sciences, Gomal University, Dera Ismail Khan, Pakistan
| | - B Ahmad
- Department of Animal Sciences, Faculty of Veterinary and Animal Sciences, MNS University of Agriculture Multan, Punjab, 25000, Pakistan
| | - I U Khan
- Faculty of Veterinary and Animal Sciences, Gomal University, Dera Ismail Khan, Pakistan
| | - A Tariq
- Directorate of Livestock and Dairy Development Department, Khyber Pakhtunkhwa, Pakistan
| | - M Ahmad
- Department of Animal Sciences, Quaid-E Azam University Islamabad, Pakistan
| | - A Said
- Department of Parasitology, University of Agriculture Faisalabad, Pakistan
| | - S Ullah
- Department of Biochemistry, Hazara University Mansehra, Pakistan
| | - A Ali
- Institute of Pathology and Diagnostic Medicine, Khyber Medical University, Peshawar, Pakistan
| | - M U Rahman
- Institute of Pathology and Diagnostic Medicine, Khyber Medical University, Peshawar, Pakistan
| | - A Zaman
- Faculty of Veterinary and Animal Sciences, Gomal University, Dera Ismail Khan, Pakistan
| | - H Bilal
- Second Affiliated Hospital of Shantou University Medical College, Shantou, China
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Thien L, Cham Y, Chan D, Khor H, Chan E, Chung B, Pang I, Ling H, Chow H, Shu F, Ho K, Tan C, Koh K, Oon Y, Said A, Fong A, Ong T. Association between the novel biomarker oxidised LDL/beta 2 glycoprotein I complexes and coronary artery calcification with cardiovascular outcomes – a long term prospective study. Prospective study. Int J Cardiol 2022. [DOI: 10.1016/j.ijcard.2022.10.032] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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8
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Foo V, Pang I, Shu F, Fong A, Chen L, Ho K, Ling H, Bhavnani C, Thien L, Chung B, Oon Y, Koh K, Tan C, Cham Y, Said A, Ong T. Safety and efficacy of renal denervation (RDN) in treatment of resistant hypertension: A single centre, 1 year observational study. Int J Cardiol 2022. [DOI: 10.1016/j.ijcard.2022.10.040] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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9
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Chow H, Ling H, Chan E, Chung B, Then L, Pang I, Khor H, Chan S, Tan C, Koh K, Cham Y, Said A, Fong A, Ong T, Oon Y. Prevalence of acid alpha-glucosidase (GAA) pseudodefiency allele and it's clinical significance among patients with cardiomyopathy. Int J Cardiol 2022. [DOI: 10.1016/j.ijcard.2022.10.038] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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10
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Chung B, Leong T, Chew L, Law W, Thien L, Pang I, Ling H, Chow H, Tan C, Koh K, Cham Y, Said A, Fong A, Ong T, Oon Y. Clinical characteristics of patients with cardiac amyloidosis in Sarawak: Comparison between transthyretin and light-chain amyloid cardiomyopathy. Int J Cardiol 2022. [DOI: 10.1016/j.ijcard.2022.10.067] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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11
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Rimbert A, Yeung M, Dalila N, Yu H, Loaiza N, Oldoni F, Van Der Graaf A, Wang S, Said A, Blauw L, Girardeau A, Bray L, Caillaud A, Bloks V, Marrec M, Moulin P, Rensen P, Van De Sluis B, Snieder H, Di Filippo M, Van Der Harst P, Tybjærg-Hansen A, Zimmerman P, Cariou B, Kuivenhoven J. GPR146 gene variants are associated with reduced plasma lipids and cardiovascular health: A novel role for GPR146 in hypolipidemia. Atherosclerosis 2022. [DOI: 10.1016/j.atherosclerosis.2022.06.216] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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12
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Mashar M, Said A, Hussain M, Eze V. Reporting acute trauma in a non-trauma centre: improving scan turnover time. Clin Radiol 2022. [DOI: 10.1016/j.crad.2022.01.023] [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: 11/24/2022]
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13
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Bhavnani CD, Koh KT, Oon YY, Pang IX, Tan CT, Chen LS, Shu FEP, Ho KH, Cham YL, Ling HS, Said A, Thien LK, Chung BK, Fong AYY, Ong TK. Three year clinical outcomes of fractional flow reserve guided coronary revascularization using a monorail pressure sensor microcatheter. Eur Heart J 2022. [DOI: 10.1093/eurheartj/ehab849.123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Funding Acknowledgements
Type of funding sources: None.
Background
Fractional flow reserve (FFR) has a Class 1A recommendation for guiding coronary revascularization in stable coronary artery disease. Deferral of revascularization for coronary stenosis of FFR >0.80 has shown favorable long-term outcomes, yet the adoption in real-world practice is limited. To date, there is no study on FFR guided PCI in the Malaysian population.
Objective
(1) To explore the 3-year clinical outcome of FFR guided coronary revascularization.
(2) To compare the clinical outcome of FFR guided deferral of coronary revascularization versus FFR guided revascularization. The primary outcome was a composite of all cause mortality, non fatal myocardial infarction (MI) and ischemia driven target vessel revascularization (TVR)
Results
Thirty-five patients were lost to follow up leaving 78 patients (95 vessels) for final analysis. The mean age was 59.3 ± 9.4 years old. 69 (88.5%) patients were male, 24 (30.7%) had diabetes mellitus, 58 (74.3%) had dyslipidemia, 61 (78.2%) had hypertension and 45 (57.7%) were smokers. The mean LVEF was 56.7 ± 14.7%. FFR to the LAD artery was performed in 64 (82%) patients. Based on the FFR value of 0.80, 47 (60.2%) patients had FFR guided deferral of coronary revascularization and 31 (39.7%) patients had FFR guided revascularization.
At 3 years, 11 (14.1%) patients met the primary outcome, mainly driven by all-cause mortality (11.5%). The primary outcome was met in 14.9% of FFR guided deferral versus 12.9% of FFR guided revascularization (p = 0.828). All-cause mortality was 12.7% in patients with FFR guided deferral compared to 9.7% in patients with FFR guided revascularization at 3 years (p = 0.712).
Cox proportional hazards model did not demonstrate any independent predictors associated with the primary outcome or all cause mortality.
Conclusion
FFR guided deferral of revascularization was safe and had comparable long-term clinical outcomes to FFR guided PCI. To our knowledge, this is the first study on long-term clinical outcome on FFR guided revascularization in Malaysia. Abstract Figure. Kaplan-Meier curve primary end point Abstract Figure. Kaplan-Meier curve all cause mortality
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Affiliation(s)
| | - K T Koh
- Sarawak Heart Center, Kuching, Malaysia
| | - Y Y Oon
- Sarawak Heart Center, Kuching, Malaysia
| | - I X Pang
- Sarawak Heart Center, Kuching, Malaysia
| | - C T Tan
- Sarawak Heart Center, Kuching, Malaysia
| | - L S Chen
- Sarawak Heart Center, Kuching, Malaysia
| | - F E P Shu
- Sarawak Heart Center, Kuching, Malaysia
| | - K H Ho
- Sarawak Heart Center, Kuching, Malaysia
| | - Y L Cham
- Sarawak Heart Center, Kuching, Malaysia
| | - H S Ling
- University Malaysia Sarawak (UNIMAS), Kuching, Malaysia
| | - A Said
- University Malaysia Sarawak (UNIMAS), Kuching, Malaysia
| | - L K Thien
- Sarawak Heart Center, Kuching, Malaysia
| | - B K Chung
- Sarawak Heart Center, Kuching, Malaysia
| | | | - T K Ong
- Sarawak Heart Center, Kuching, Malaysia
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Chow H, Ling H, Chung B, Then L, Pang I, Chen L, Bhavnani C, Tan C, Oon Y, Koh K, Cham Y, Fong A, Said A, Ong T. Utility of dutch lipid clinic network score to estimate prevalence of familial hypercholestrolemia in patients with ST-elevation myocardial infarction. Int J Cardiol 2021. [DOI: 10.1016/j.ijcard.2021.10.067] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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15
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Bhavnani C, Koh K, Thien L, Chung B, Pang I, Chen L, Ling H, Chow H, Tan C, Oon Y, Cham Y, Said A, Fong A, Ong T. Three-year clinical outcome of fractional flow reserve guided coronary revascularization with monorail pressure microcatheter. Int J Cardiol 2021. [DOI: 10.1016/j.ijcard.2021.10.034] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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16
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Chen L, Oon Y, Chung B, Thien L, Chow H, Pang I, Ling H, Chandan D, Tan C, Koh K, Said A, Cham Y, Alan A, Ong T. Clinical characteristics of patients with hereditary transthyretin amyloid cardiomyopathy (ATTR-CM) in Sarawak. Int J Cardiol 2021. [DOI: 10.1016/j.ijcard.2021.10.038] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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17
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Chung B, Oon Y, Thien L, Pang I, Chen L, Ling H, Chow H, Chandan D, Tan C, Koh K, Cham Y, Said A, Fong A, Ong T. Comparison of teicholz versus biplane simpson method in the assessment of left ventricular volumes and ejection fraction among healthy subjects. Int J Cardiol 2021. [DOI: 10.1016/j.ijcard.2021.10.122] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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18
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Chen L, Oon Y, Rawlings C, Sabeng K, Adam S, Lasep H, Pang I, Ling H, Chandan D, Tan C, Koh K, Cham Y, Said A, Fong A, Ong T. Semi-automated left ventricular endocardial detection versus hand-tracing in the measurement of left ventricular volumes and ejection fraction in daily clinical practice. Eur Heart J 2021. [DOI: 10.1093/eurheartj/ehab724.097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
The common method of assessing left ventricle (LV) volumes and ejection fraction (EF) is hand-tracing Biplane Simpson method. Alternatively, ultrasound vendors offer different semi-automated LV endocardial border detection software with anatomical intelligence to assess LV volumes and EF. By using speckle-tracking technique, this software tracks the LV endocardium throughout the cardiac cycle and computes the LV volumes in every image frame using the disk summation method from which a volume-curve is generated, and the EF is calculated using the maximum and minimum volumes obtained. Data on the performance of this method in comparison with the hand-tracing Biplane Simpson method in daily clinical practice is scarce.
Purpose
To determine the accuracy of LV volumes and EF using semi-automated LV endocardial detection tracing, and to compare the reproducibility of this method with the hand-tracing Biplane Simpson method, among operators with varying level of experience in echocardiography.
Methods
This was a single center retrospective observational study, conducted in year 2020. 127 patients, aged >18 years, who underwent clinically indicated transthoracic echocardiography were recruited. The echocardiographic images were analyzed independently in a blinded fashion by 3 operators – a sonographer, a fellow-in-training and a cardiologist specialized in echocardiography. The LV volumes and EF were first measured using hand-tracing Biplane Simpson method, then repeated using semi-automated tracing at a different time and the operator were blinded to the initial hand-tracing measurements.
Results
The mean age of patients was 50±16 years, 35.4% were male, mean body surface area was 1.62±0.18m2, 92.1% were in sinus rhythm, and 61.4% had good acoustic window. Table 1 shows the LV end-diastolic volume (EDV), end-systolic volume (ESV) and EF, measured using different method, by the 3 operators. There were excellent correlation and agreement between semi-automated tracing measurements and hand-tracing measurements of LV EDV (r=0.985, LOA [mean ± 1.96 SD] 16.9 ml, ICC 0.991), ESV (r=0.990, LOA 12.7 ml, ICC 0.994) and EF (r=0.962, LOA 7.43%, ICC 0.967) by experienced cardiologist. The limit of agreement (LOA) between cardiologist and sonographer for semi-automated tracing measurement of LV EDV, ESV and EF were 29.13 ml, 19.74 ml and 9.25% respectively, which was comparable with that of hand-tracing measurement. The agreement between cardiologist and fellow-in-training for semi-automated tracing measurement of LV volumes and EF was slightly better than hand-tracing method, with a LOA of 25.60 ml, 17.48 ml and 7.08%, for EDV, ESV and EF respectively (Table 2).
Conclusion
In daily clinical practice, measurement of LV volumes and EF using semi-automated LV endocardial tracing method is accurate and demonstrates comparable reproducibility with hand-tracing Biplane Simpson method among operators with different level of experience in echocardiography.
Funding Acknowledgement
Type of funding sources: None.
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Affiliation(s)
- L.S Chen
- Sarawak Heart Center, Department of Cardiology, Kota Samarahan, Malaysia
| | - Y.Y Oon
- Sarawak Heart Center, Department of Cardiology, Kota Samarahan, Malaysia
| | - C Rawlings
- Sarawak Heart Center, Department of Cardiology, Kota Samarahan, Malaysia
| | - K Sabeng
- Sarawak Heart Center, Department of Cardiology, Kota Samarahan, Malaysia
| | - S Adam
- Sarawak Heart Center, Department of Cardiology, Kota Samarahan, Malaysia
| | - H Lasep
- Sarawak Heart Center, Department of Cardiology, Kota Samarahan, Malaysia
| | - I.X Pang
- Sarawak Heart Center, Department of Cardiology, Kota Samarahan, Malaysia
| | - H.S Ling
- University Malaysia Sarawak, Faculty of Medicine and Health Sciences, Kota Samarahan, Malaysia
| | - D.B Chandan
- Sarawak Heart Center, Department of Cardiology, Kota Samarahan, Malaysia
| | - C.T Tan
- Sarawak Heart Center, Department of Cardiology, Kota Samarahan, Malaysia
| | - K.T Koh
- Sarawak Heart Center, Department of Cardiology, Kota Samarahan, Malaysia
| | - Y.L Cham
- Sarawak Heart Center, Department of Cardiology, Kota Samarahan, Malaysia
| | - A Said
- University Malaysia Sarawak, Faculty of Medicine and Health Sciences, Kota Samarahan, Malaysia
| | - A.Y.Y Fong
- Sarawak Heart Center, Department of Cardiology, Kota Samarahan, Malaysia
| | - T.K Ong
- Sarawak Heart Center, Department of Cardiology, Kota Samarahan, Malaysia
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19
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Said A, Lesurf R, Delfosse K, Oliveros W, Mattiolo K, Meng G, Mele M, Maass P, Ellis J, Scherer S, Mital S. FUNCTIONAL VALIDATION OF NON-CODING REGULATORY VARIANTS ASSOCIATED WITH CHILDHOOD CARDIOMYOPATHY. Can J Cardiol 2021. [DOI: 10.1016/j.cjca.2021.07.140] [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: 10/20/2022] Open
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20
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Li H, Zhang TT, Said A, Fabbris G, Mazzone DG, Yan JQ, Mandrus D, Halász GB, Okamoto S, Murakami S, Dean MPM, Lee HN, Miao H. Giant phonon anomalies in the proximate Kitaev quantum spin liquid α-RuCl 3. Nat Commun 2021; 12:3513. [PMID: 34112804 PMCID: PMC8192767 DOI: 10.1038/s41467-021-23826-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2021] [Accepted: 04/30/2021] [Indexed: 11/18/2022] Open
Abstract
The Kitaev quantum spin liquid epitomizes an entangled topological state, for which two flavors of fractionalized low-energy excitations are predicted: the itinerant Majorana fermion and the Z2 gauge flux. It was proposed recently that fingerprints of fractional excitations are encoded in the phonon spectra of Kitaev quantum spin liquids through a novel fractional-excitation-phonon coupling. Here, we detect anomalous phonon effects in α-RuCl3 using inelastic X-ray scattering with meV resolution. At high temperature, we discover interlaced optical phonons intercepting a transverse acoustic phonon between 3 and 7 meV. Upon decreasing temperature, the optical phonons display a large intensity enhancement near the Kitaev energy, JK~8 meV, that coincides with a giant acoustic phonon softening near the Z2 gauge flux energy scale. These phonon anomalies signify the coupling of phonon and Kitaev magnetic excitations in α-RuCl3 and demonstrates a proof-of-principle method to detect anomalous excitations in topological quantum materials.
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Affiliation(s)
- Haoxiang Li
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | - T T Zhang
- Department of Physics, Tokyo Institute of Technology, Okayama, Meguro-ku, Tokyo, Japan
- Tokodai Institute for Element Strategy, Tokyo Institute of Technology, Nagatsuta, Midori-ku, Yokohama, Kanagawa, Japan
| | - A Said
- Advanced Photon Source, Argonne National Laboratory, Argonne, IL, USA
| | - G Fabbris
- Advanced Photon Source, Argonne National Laboratory, Argonne, IL, USA
| | - D G Mazzone
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY, USA
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, Villigen, Switzerland
| | - J Q Yan
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | - D Mandrus
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA
- Department of Materials Science and Engineering, the University of Tennessee at Knoxville, Knoxville, TN, USA
| | - Gábor B Halász
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | - S Okamoto
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | - S Murakami
- Department of Physics, Tokyo Institute of Technology, Okayama, Meguro-ku, Tokyo, Japan
- Tokodai Institute for Element Strategy, Tokyo Institute of Technology, Nagatsuta, Midori-ku, Yokohama, Kanagawa, Japan
| | - M P M Dean
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY, USA
| | - H N Lee
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | - H Miao
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA.
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21
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Ullah N, Said A, Israr M, Rasool A, Akbar F, Ahmad S, Mehmood SA, Jabeen H, Islam M, Muhammad S, Noureenh S, Habiba U, Ahmed D, Shah M, Khan MAA, Siraj M. Effect of different protein based feed on the growth of mahseer. BRAZ J BIOL 2021; 82:e243670. [PMID: 34161428 DOI: 10.1590/1519-6984.243670] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2020] [Accepted: 10/21/2020] [Indexed: 11/22/2022] Open
Abstract
For the proper growth of fish, it is necessary to feed the fish with a proper and balanced diet. A study was conducted to find out the effect of different protein-based diets on fingerlings of Tor putitora (mahseer). A feed with dietary protein levels of 35%, 40%, 45%, and 50% were prepared. The effect of different protein-based feed on weight gain, standard growth rate (SGR), food conversion ratio (FCR), percent weight gain, food conversion efficiency (FCE), and protein efficiency ratio (PER) was studied. An increase was observed in the growth rate with an increase in protein concentration up to 45%. The fingerlings fed a 45% protein diet shown the highest growth, followed by 50%, 40%, and 35%. The SGR value was greatest for 45% protein diet (8.56) followed by 50% and 40%, while the least values were observed for 35% protein feed (1.57). The same trend was observed for FCE. The highest PER values was observed in fishes fed 45% protein-based feed (0.65) followed by 50% (0.56), 40% (0.38) and35% (0.17). The food conversion ratio was lowest for 45% protein diet (3.41), while the greatest for 35% protein feed (16.85). It was concluded that a 45% protein-based diet was the best feed formulation for higher production of Tor putitora. However, research on the same percentage of protein diet is recommended for yearlings.
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Affiliation(s)
- N Ullah
- University of Swat, Centre for Animal Sciences and Fisheries, Charbagh, Pakistan
| | - A Said
- University of Swat, Centre for Animal Sciences and Fisheries, Charbagh, Pakistan
| | - M Israr
- University of Swat, Department of Forensics Sciences, Charbagh, Pakistan
| | - A Rasool
- University of Swat, Centre for Biotechnology and Microbiology, Charbagh, Pakistan
| | - F Akbar
- University of Swat, Centre for Biotechnology and Microbiology, Charbagh, Pakistan
| | - S Ahmad
- Hazara University Mansehra, Department of Zoology, Mansehra, Pakistan
| | - S A Mehmood
- Hazara University Mansehra, Department of Zoology, Mansehra, Pakistan
| | - H Jabeen
- Women University Mardan, Department of Microbiology, Mardan, Pakistan
| | - M Islam
- Hazara University Mansehra, Department of Genetics, Mansehra, Pakistan
| | - S Muhammad
- University of Swat, Institute of Agricultural Sciences & Forestry, Charbagh, Pakistan
| | - S Noureenh
- University of Haripur, Department of Forestry and Wildlife Management, Haripur, Pakistan
| | - Ume Habiba
- University of Haripur, Department of Forestry and Wildlife Management, Haripur, Pakistan
| | - D Ahmed
- University of Haripur, Department of Medical Lab Technology, Haripur, Pakistan
| | - M Shah
- University of Swat, Centre for Animal Sciences and Fisheries, Charbagh, Pakistan
| | - M A A Khan
- University of Peshawar: Peshawar, Centre of Biotechnology and Microbiology, Pakistan
| | - M Siraj
- Department of Zoology, Abbottabad University of Science & Technology, Pakistan
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22
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Amin YA, Said A. The Addition of Chitosan to GnRH Analog Induces Ovarian Resumption and Improves Conception Rates in Buffaloes. Trop Anim Sci J 2021. [DOI: 10.5398/tasj.2021.44.1.1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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23
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Said A, Van De Vegte Y, Verweij N, Van Der Harst P. Associations of observational and genetically determined caffeine intake with coronary artery disease and diabetes. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.1493] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
Caffeine is the most widely consumed psychostimulant and is associated with lower risk of coronary artery disease (CAD) and type 2 diabetes (T2D). However, whether these associations are causal remains unknown.
Objectives
This study aimed to identify genetic variants associated with caffeine intake, and to investigate possible causal links between genetically determined caffeine intake and CAD or T2D. Additionally, we aimed to replicate previous observational findings between caffeine intake and CAD or T2D.
Methods
Genome wide associated studies (GWAS) were performed on caffeine intake from coffee, tea or both in 407,072 UK Biobank participants. Identified variants were used in a two-sample Mendelian randomization (MR) approach to investigate evidence for causal links between caffeine intake and CAD in CARDIoGRAMplusC4D (60,801 cases; 123,504 controls) or T2D in DIAGRAM (26,676 cases; 132,532 controls). Observational associations were tested within UK Biobank using Cox regression analyses.
Results
Moderate observational caffeine intakes from coffee or tea were associated with lower risks of CAD or T2D compared to no or high intake, with the lowest risks at intakes of 120–180 mg/day from coffee for CAD (HR=0.77 [95% CI: 0.73–0.82; P<1e-16]), and 300–360 mg/day for T2D (HR=0.76 [95% CI: 0.67–0.86]; P=1.57e-5). GWAS identified 51 novel genetic loci associated with caffeine intake, enriched for central nervous system genes. In contrast to observational analyses, MR analyses in CARDIoGRAMplusC4D and DIAGRAM yielded no evidence for causal links between caffeine intake and the development of CAD or T2D.
Conclusions
MR analyses indicate caffeine intake might not protect against CAD or T2D, despite protective associations in observational analyses.
Manhattan_plot_CaffeineIntake
Funding Acknowledgement
Type of funding source: None
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Affiliation(s)
- A Said
- University Medical Center Groningen, Groningen, Netherlands (The)
| | - Y.J Van De Vegte
- University Medical Center Groningen, Groningen, Netherlands (The)
| | - N Verweij
- University Medical Center Groningen, Groningen, Netherlands (The)
| | - P Van Der Harst
- University Medical Center Groningen, Groningen, Netherlands (The)
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24
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Upton MH, Zhang J, Zheng H, Said A, Mitchell JF. Electronic coupling in square planar La 4Ni 3O 8. J Phys Condens Matter 2020; 32:425503. [PMID: 32629441 DOI: 10.1088/1361-648x/aba314] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2020] [Accepted: 07/06/2020] [Indexed: 06/11/2023]
Abstract
A study of addexcitation in La4Ni3O8(La-438) using x-ray absorption scattering and resonant inelastic x-ray scattering (RIXS) at the Ni K-edge is presented. The incident energy dependence of thisddexcitation shows a maximum at the 1s→ 4pπtransition. Its intensity at the main edge is proportional to the amount of incident x-ray polarization parallel to thec-axis. These observations suggest that the RIXS process underlying this excitation includes a strong Ni 3d-Ni 4pCoulomb interaction and excludes the '4p-as-spectator' approximation. The dominant Ni 3dCoulomb interaction is with Ni 4pπwith limited or no interaction with the Ni 4pσ. An insulating gap closing is observed as a function of temperature.
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Affiliation(s)
- M H Upton
- Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, United States of America
| | - Junjie Zhang
- Materials Science Division, Argonne National Laboratory, Argonne, IL 60439, United States of America
- Institute of Crystal Materials, Shandong University, Jinan, Shandong 250100, People's Republic of China
| | - Hong Zheng
- Materials Science Division, Argonne National Laboratory, Argonne, IL 60439, United States of America
| | - A Said
- Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, United States of America
| | - J F Mitchell
- Materials Science Division, Argonne National Laboratory, Argonne, IL 60439, United States of America
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25
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Iqbal M, Elmassry A, Saad H, AM Gad A, Ibrahim O, Hamed N, Saeed A, S. Khalil A, Tawfik M, Said A, Amer I, Nooreldin A, Said O, Reffat M, Anwar S, Badawi A. Standard cross-linking protocol versus accelerated and transepithelial cross-linking protocols for treatment of paediatric keratoconus: a 2-year comparative study. Acta Ophthalmol 2020; 98:e352-e362. [PMID: 31654497 PMCID: PMC7216930 DOI: 10.1111/aos.14275] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2019] [Accepted: 09/18/2019] [Indexed: 01/14/2023]
Abstract
PURPOSE To compare the efficacy, safety and stability of standard epithelium-off cross-linking (SCXL) versus accelerated epithelium-off cross-linking (ACXL) and transepithelial epithelium-on cross-linking (TCXL) in the treatment of progressive keratoconus (KC) in children. METHODS This prospective multicentre controlled trial included 271 eyes (136 children) with grade 1-3 progressive KC who were randomized to undergo SCXL (n = 91, as a control group), ACXL (n = 92) or TCXL (n = 88). Uncorrected and corrected distance visual acuity, subjective refraction, pachymetry, keratometry and corneal topography measurements were recorded preoperatively and 6, 12 and 24 months postoperatively. RESULTS At 1 year, there was no significant difference in uncorrected distance visual acuity, refractive sphere, cylinder, spherical equivalent or Kmax between the ACXL and SCXL groups; however, during year 2, ACXL regressed while SCXL continued to improve. After 2 years, there were significant differences in all visual, refractive and keratometric components between SCXL and both ACXL and TCXL (p < 0.0001) and between ACXL and TCXL (p < 0.0001). KC progressed in 5.4% of patients who had ACXL and 28.4% of those who had TCXL but in none of those who had SCXL. Vernal keratoconjunctivitis was documented in 43.3% of eyes that progressed postoperatively. CONCLUSION SCXL was more effective for paediatric KC and achieved greater stability than either ACXL or TCXL, and ACXL was superior to TCXL. SCXL also achieved marked improvement in both myopia and spherical equivalent; however, these refractive outcomes were unpredictable and uncontrollable. TCXL had a 28.4% failure rate within 2 years. SCXL is preferable for management of paediatric KC.
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Affiliation(s)
- Mohammed Iqbal
- Department of OphthalmologyFaculty of MedicineSohag UniversitySohagEgypt
| | - Ahmed Elmassry
- Department of OphthalmologyFaculty of MedicineAlexandria UniversityAlexandriaEgypt
| | - Hisham Saad
- Department of OphthalmologyFaculty of MedicineTanta UniversityTantaEgypt
| | - Ahmed AM Gad
- Department of OphthalmologyFaculty of MedicineZagazig UniversityZagazigEgypt
| | - Ola Ibrahim
- Department of OphthalmologyFaculty of MedicineAin Shams UniversityCairoEgypt
| | - Noha Hamed
- Department of OphthalmologyFaculty of MedicineAin Shams UniversityCairoEgypt
| | - Ahmed Saeed
- Department of OphthalmologyFaculty of MedicineBenha UniversityBenhaEgypt
| | - Ahmad S. Khalil
- Department of OphthalmologyFaculty of MedicineZagazig UniversityZagazigEgypt
| | - Mohamed Tawfik
- Department of OphthalmologyMemorial Institute of OphthalmologyGizaEgypt
| | - Amr Said
- Department of OphthalmologyFaculty of MedicineAlexandria UniversityAlexandriaEgypt
| | - Ibrahim Amer
- Department of OphthalmologyFaculty of MedicineAlazhar UniversityAssuitEgypt
| | - Asaad Nooreldin
- Department of OphthalmologyFaculty of MedicineAlazhar UniversityAssuitEgypt
| | - Omar Said
- Department of OphthalmologyFaculty of MedicineFayoum UniversityFayoumEgypt
| | - Mohamed Reffat
- Department of OphthalmologyMansoura Ophthalmic HospitalMansouraEgypt
| | - Seif Anwar
- Department of OphthalmologyMansoura Ophthalmic HospitalMansouraEgypt
| | - Amani Badawi
- Department of OphthalmologyFaculty of MedicineMansoura UniversityMansouraEgypt
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26
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Kuan PX, Chan WK, Chua PF, Yeo J, Sapri FE, Bujang MA, Said A. Lifestyle factors associated with cardiovascular risk among healthcare workers from the tertiary hospitals in Sarawak. Malays Fam Physician 2020; 15:15-22. [PMID: 32284800 PMCID: PMC7136671] [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] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
INTRODUCTION A cross-sectional study is used to evaluate the lifestyle factors associated with cardiovascular disease (CVD) risk among healthcare workers in tertiary hospitals in Sarawak, Malaysia. METHODS A questionnaire-based survey using the Simple Lifestyle Indicator Questionnaire (SLIQ) was administered to, and anthropometric measurements were collected from, 494 healthcare workers. RESULTS The mean age of the subjects was 32.4±8.4, with a range of 19 to 59 years. The subjects were from the allied health (45.5%), management and professional (25.1%) and executive (29.4%) fields. Overall, 47.4% of the subjects were of normal weight, 30.2% were overweight, 17.2% were obese and 5.2% were underweight. The mean number of working hours per week for the subjects was 47.6±14.0 with the highest working hours found among the management and professional group, followed by the executive and allied health groups. Overall, 39.7% of the healthcare workers worked office hours, 36.6% worked within the shift system, 20.9% worked office hours and were on-call and the remaining 2.8% worked a mixture of office hours and shifts. Based on the SLIQ score, 58.1% were classified as at intermediate risk for CVD, 38.5% were in the healthy category and 3.4% were in the unhealthy category. Factors associated with a healthier lifestyle were being female (Odds Ratio [OR]= 12.1; CI=3.2-46.4), professional (mean score= 6.70), in the allied health group (mean score=7.33) and in the normal BMI group (OR= 9.3, CI= 1.8-47.0). CONCLUSION In our study, healthcare workers had an intermediate risk of developing CVD in the future. Thus, there is a need to intervene in the lifestyle factors contributing to CVD.
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Affiliation(s)
- P X Kuan
- Clinical Research Centre (CRC) Sungai Buloh Hospital, Jalan Hospital 47000 Selangor, Malaysia
| | - W K Chan
- Department of Anaesthesiology and Intensive Care, Sarawak General Hospital, Jalan Hospital, 93586 Kuching, Sarawak, Malaysia
| | - P F Chua
- Department of Paraclinical Science Faculty of Medicine and Health Sciences, Universiti Malaysia Sarawak, Malaysia
| | - Jjp Yeo
- Department of Cardiology, Sarawak General Hospital Heart Centre, Jalan Lingkaran Luar Kuching, 94300 Kota Samarahan, Sarawak, Malaysia
| | - F E Sapri
- Clinical Research Centre, Sarawak General Hospital, Jalan Hospital 93586 Kuching, Sarawak, Malaysia
| | - M A Bujang
- Clinical Research Centre, Sarawak General Hospital, Jalan Hospital, 93586 Kuching, Sarawak, Malaysia
| | - A Said
- Faculty of Medicine and Health Sciences, Universiti Malaysia Sarawak, 94300 Kota Samarahan Sarawak, Malaysia
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27
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Shaheen MS, AbouSamra A, Helaly HA, Said A, Elmassry A. Comparison between refractive outcomes of femtosecond laser-assisted cataract surgery and standard phacoemulsification. BMC Ophthalmol 2020; 20:1. [PMID: 31898534 PMCID: PMC6941343 DOI: 10.1186/s12886-019-1277-9] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2019] [Accepted: 12/16/2019] [Indexed: 11/17/2022] Open
Abstract
BACKGROUND To compare the visual and refractive outcomes of femtosecond laser assisted cataract surgery (FLACS) using Victus platform (Technolas Bausch and Lomb (B&L), Munich, Germany) and conventional phacoemulsification cataract surgery (CPCS). METHODS A retrospective study of 100 eyes operated for cataract. FLACS was performed in 50 eyes and CPCS was done in another 50 eyes. Preoperative and 6 months postoperative visual and refractive evaluation (efficacy, safety, predictability, and surgically induced astigmatism) as well as higher-order aberrations were analyzed. Efficacy index which equals post-operative mean of uncorrected distance visual acuity (UDVA) divided by preoperative mean corrected distance visual acuity (CDVA) was calculated in both groups. Safety index equals post-operative mean of corrected distance visual acuity (CDVA) divided by preoperative mean CDVA. RESULTS Logarithm of the Minimum Angle of Resolution (LogMAR), UDVA improved in both groups after surgery (p < 0.05). It was 0.23 ± 0.20 and 0.291 ± 0.311 log MAR in FLACS and CPCS groups respectively. Safety index was 1.777 in FLACS group and 1.744 in CPCS groups showing high degree of safety of both measures. Mean surgically induced astigmatism (SIA) was 0.35 ± 0.67 D and 0.901 ± 0.882 D in FLACS and CPCS groups respectively (p = 0.015). The post-operative comparison between both groups was in favor of CPCS group vs. FLACS group regarding total aberrations (0.563 ± 0.386 vs. 0.91 ± 1.20) (p = 0.03), while low order aberrations were significantly less in FLACS group vs. CPCS group (0.64 + 0.63 vs. 2.07 + 3.15) (p = 0.027). RMS high order aberration was higher in FLACS group vs. CPCS group but of no statistical significance 0.54 ± 0.96 vs. 0.328 ± 0.360 (p = 0.082). CONCLUSION Femtosecond laser -assisted cataract surgery was a safe and precise procedure but enhanced visual outcomes only minimally when compared to conventional cataract surgery in experienced hands. Both FLACS and manual surgeries can achieve a high efficacy, predictability and safety with slight superior outcomes in FLACS. TRIAL REGISTRATION NUMBER PACTR201804003256258 (date: 27 Mar 2018) Available at: https://pactr.samrc.ac.za/.
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Affiliation(s)
- Mohamed Shafik Shaheen
- Ophthalmology Department, Faculty of Medicine, Alexandria University, 30 Roshdystreet, Roshdy, Alexandria, Egypt
| | - Amir AbouSamra
- Ophthalmology Department, Faculty of Medicine, Alexandria University, 30 Roshdystreet, Roshdy, Alexandria, Egypt
| | - Hany Ahmed Helaly
- Ophthalmology Department, Faculty of Medicine, Alexandria University, 30 Roshdystreet, Roshdy, Alexandria, Egypt
| | - Amr Said
- Ophthalmology Department, Faculty of Medicine, Alexandria University, 30 Roshdystreet, Roshdy, Alexandria, Egypt
| | - Ahmed Elmassry
- Ophthalmology Department, Faculty of Medicine, Alexandria University, 30 Roshdystreet, Roshdy, Alexandria, Egypt
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28
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Tan CT, Koh KT, Onn YY, Ho KH, Said A, Mohd Amin NH, Shu FEP, Khiew NZ, Cham YL, Fong AYY, Ong TK, Eng SY, Lee ZY, Madzlan N. P13 Safety and efficacy of sacubitril-valsartan initiation during and after acute decompensated heart failure with reduced ejection fraction. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehz872.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Background
The PIONEER-HF trial has demonstrated the safety of Sacubitril-Valsartan initiation during acute decompensated heart failure (ADHF) compared to Enalapril. The efficacy outcome was also addressed by the surrogate end point of reduction in NT-proBNP. However, the safety and efficacy of Sacubitril-Valsartan initiation during ADHF compared to initiation after ADHF was unknown.
Objectives
(1) To compare the safety and efficacy of Sacubitril-Valsartan initiation during ADHF(inpatient) to initiation after ADHF(outpatient). (2) To explore the echocardiogram parameters associated with Sacubitril-Valsartan initiation during ADHF(inpatient) versus after ADHF(outpatient).
Methods
We enrolled patients diagnosed with heart failure with reduced ejection fraction (HFrEF) initiated on Sacubitril-Valsartan from February 2017 to December 2018. The baseline characteristics, echocardiogram parameters (changes in LVEF and positive remodeling), composite safety outcomes (hypotension, interruption of Sacubitril-Valsartan and worsening of renal function), and efficacy outcomes (cardiac death, readmission for heart failure) were compared.
Results
Thirty-seven patients were identified out of which 21 patients started Entresto after ADHF (outpatient group) and 16 patients during ADHF (inpatient group). The median follow-up duration was 196 days (IQR: 105 to 328days). The baseline characteristics were similar between the 2 groups. Outpatient groups achieved a significantly higher maximally tolerable dose of Sacubitril-Valsartan compared to inpatient group (median 400mg/day versus 200mg/day, p = 0.008) despite a similar starting dose (median 100mg/day versus 100mg/day, p = 0.127). The composite efficacy outcomes were similar between the 2 groups (4.8% versus 18.8%, p = 0.296). The composite safety outcome was similar between the groups (18.8% versus 4.8%, HR5.70 p = 0.054, 95%CI 0.967 to 33.60). Both groups achieved a significant improvement in LVEF after initiation of Sacubitril-Valsartan therapy: mean LVEF 23.44 ± 7.88% to 34.30 ± 13.88% (p = 0.001) in outpatient group; mean LVEF 22.99 ± 11.31% to 38.81 ± 13.91% (p = 0.002) in inpatient group. Reverse remodeling (reduction of LVESV≥15%) was similar between the 2 groups (61.9% versus 50.0%, p = 0.506).
Conclusions
Among patients with HFrEF in ADHF, initiation of Sacubitril-Valsartan therapy during or after ADHF led to similar safety and efficacy. Overall, there was a significant improvement in LVEF and positive remodeling of the LV regardless of the timing of initiation of therapy.
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Affiliation(s)
- C T Tan
- Sarawak General Hospital, Kuching, Malaysia
| | - K T Koh
- Sarawak General Hospital, Kuching, Malaysia
| | - Y Y Onn
- Sarawak General Hospital, Kuching, Malaysia
| | - K H Ho
- Sarawak General Hospital, Kuching, Malaysia
| | - A Said
- Sarawak General Hospital, Kuching, Malaysia
| | | | - F E P Shu
- Sarawak General Hospital, Kuching, Malaysia
| | - N Z Khiew
- Sarawak General Hospital, Kuching, Malaysia
| | - Y L Cham
- Sarawak General Hospital, Kuching, Malaysia
| | - A Y Y Fong
- Sarawak General Hospital, Kuching, Malaysia
| | - T K Ong
- Sarawak General Hospital, Kuching, Malaysia
| | - S Y Eng
- Sarawak General Hospital, Kuching, Malaysia
| | - Z Y Lee
- Sarawak General Hospital, Kuching, Malaysia
| | - N Madzlan
- Sarawak General Hospital, Kuching, Malaysia
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29
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Tan C, Koh K, Said A, Onn Y, Ho K, Shu F, Khiew N, Cham Y, Fong A, Ong T, Mohd Amin N, Eng S, Lee Z, Madzlan N. Safety and Efficacy of Sacubitril-Valsartan Initiation During and After Acute Decompensated Heart Failure with Reduced Ejection Fraction. Int J Cardiol 2019. [DOI: 10.1016/j.ijcard.2019.11.013] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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30
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Shu F, Ho K, Tan C, Koh K, Oon Y, Bhavani C, Cham Y, Said A, Khiew N, Fong A, Ong T. Infective Endocarditis at A Tertiary Referral Centre in A Developing Country: Aetiology, Microbology and Risk Factors for Embolic Complications and Mortality. Int J Cardiol 2019. [DOI: 10.1016/j.ijcard.2019.11.027] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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31
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Oon Y, Koh K, Ho K, Tan C, Shu F, Said A, Cham Y, Khiew N, Mohd Amin N, Fong A, Ong T. Global Longitudinal Strain Predicts Adverse Left Ventricular Remodeling After ST-segment Elevation Myocardial Infarction. Int J Cardiol 2019. [DOI: 10.1016/j.ijcard.2019.11.006] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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32
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Tan C, Koh K, Said A, Onn Y, Ho K, Shu F, Khiew N, Cham Y, Fong A, Ong T, Mohd Amin N, Chew S. Impact of Visual Assessment of Stress Cardiac Magnetic Resonance Imaging in Patients with Known or Suspected Coronary Artery Disease in Real World Practice: A Single Centre Experience. Int J Cardiol 2019. [DOI: 10.1016/j.ijcard.2019.11.023] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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33
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Shu FEP, Nor Hanim MA, Said A, Ho KH, Tan CT, Koh KT, Oon YY, Voon CY, Cham YL, Khiew NZ, Fong AYY, Ong TK, Liew HB. P4690Impact of myocardial viability assessed by delayed enhancement cardiovascular magnetic resonance on clinical outcomes in real world practice. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy563.p4690] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- F E P Shu
- Sarawak Heart Centre, KOTA SAMARAHAN, Malaysia
| | | | - A Said
- Sarawak Heart Centre, KOTA SAMARAHAN, Malaysia
| | - K H Ho
- Sarawak Heart Centre, KOTA SAMARAHAN, Malaysia
| | - C T Tan
- Sarawak Heart Centre, KOTA SAMARAHAN, Malaysia
| | - K T Koh
- Sarawak Heart Centre, KOTA SAMARAHAN, Malaysia
| | - Y Y Oon
- Sarawak Heart Centre, KOTA SAMARAHAN, Malaysia
| | - C Y Voon
- Sarawak Heart Centre, KOTA SAMARAHAN, Malaysia
| | - Y L Cham
- Sarawak Heart Centre, KOTA SAMARAHAN, Malaysia
| | - N Z Khiew
- Sarawak Heart Centre, KOTA SAMARAHAN, Malaysia
| | - A Y Y Fong
- Sarawak Heart Centre, KOTA SAMARAHAN, Malaysia
| | - T K Ong
- Sarawak Heart Centre, KOTA SAMARAHAN, Malaysia
| | - H B Liew
- Hospital Queen Elizabeth II, Cardiology, Kota Kinabalu, Malaysia
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Asaad T, Said A. Role of cranial electric stimulation in treatment-resistant insomnia: clinical versus polysomnographic assessment. Sleep Med 2017. [DOI: 10.1016/j.sleep.2017.11.049] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Oon Y, Mohd Amin N, Said A, Kilung A, Koh K, Khaw C, Ho K, Shu F, Tan C, Voon C, Khiew N, Cham Y, Alan F, Ong T. Accuracy and Reproducibility of Real-Time Three-Dimensional Echocardiography Versus Two-Dimensional Echocardiography in Measuring Left Ventricular Volumes and Ejection Fraction in Daily Clinical Practice. Int J Cardiol 2017. [DOI: 10.1016/j.ijcard.2017.09.076] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Ho K, Mohd Amin N, Muhd Apipi N, Husain N, Koh K, Said A, Johari F, Fong A, Ong T. Indication, Safety and Clinical Impact of Cardiovascular Magnetic Resonance: A Pilot Run of the First National CMR Registry for Malaysia. Int J Cardiol 2017. [DOI: 10.1016/j.ijcard.2017.09.079] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Oon Y, Khoo S, Lim H, Mohd Amin N, Koh K, Khaw C, Ho K, Shu F, Tan C, Voon C, Khiew N, Said A, Cham Y, Fong A, Ong T. The Incidence and Clinical Relevance of Coronary Artery Anomalies Detected on Multidetector Computed Tomography in Sarawak. Int J Cardiol 2017. [DOI: 10.1016/j.ijcard.2017.09.081] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Abd-Allah MA, Said A, Ali MN. Mitigation of Lightning Hazards at the More Sensitive Points in Wind Farms Using Ant-Colony Optimization Technique. Bulletin EEI 2016; 5:144-159. [DOI: 10.11591/eei.v5i2.524] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
Abstract
The lightning energy can be very harmfull to the wind turbine farm components. This paper attempts to evaluate the overvoltages at the sensitive points in wind farm, using ATP-EMTP package program. Four cases were performed; a) the transient voltage distribution in the insulating layer of the control line, b) the transient voltage on the control equipment, c) the coupling voltage between the tower and the control, and, d) the transient voltage distribution in the wind turbine WT generator, boast transformers and grid. These cases were performed under different lightning current conditions and at conventional design and proper design of grounding system. The results show that the ground potential rise (GPR) is reduced with using the proper design of wind turbine ground system, but the induced voltage at the control system will not affected. This work determines the optimum location of wind turbine at the areas of maximum lightning incidence. Ant colony optimization (ACO) technique is implemented to find the optimum wind farm location. This work enhances the protection strategy of the wind farms against lightning stroke.
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Abd-Allah MA, Said A, Ali MN. Mitigation of Lightning Hazards at the More Sensitive Points in Wind Farms Using Ant-Colony Optimization Technique. Bulletin EEI 2016; 5. [DOI: 10.11591/524] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
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Cham Y, Mohd Amin N, Khiew N, Said A, Fong A, Ong T. PS252 Predictors of Radiation Dose in Patients Undergoing Cardiac Computed Tomography Angiography (CCTA). Glob Heart 2016. [DOI: 10.1016/j.gheart.2016.03.194] [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: 11/15/2022] Open
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Abd-Allah MA, Said A, N. Ali M. Mitigation of Lightning Hazards at the More Sensitive Points in Wind Farms Using Ant-Colony Optimization Technique. Bulletin EEI 2016; 5. [DOI: 10.11591/eei.v5i2.618] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
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Yap LB, Nguyen STB, Qadir F, Ma SK, Muhammad Z, Koh KW, Ali Z, Tay GS, Daud A, Said A, Sahat N, Rebo R, Tamin SS, Hussin A, Kaur S, Omar R. A comparison of long-term outcomes between narrow and broad QRS complex patients treated with cardiac resynchronization therapy. Acta Cardiol 2016; 71:323-330. [PMID: 27594128 DOI: 10.2143/ac.71.3.3152093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
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Ibrahim O, Elmassry A, Said A, Abdalla M, El Hennawi H, Osman I. Combined femtosecond laser-assisted intracorneal ring segment implantation and corneal collagen cross-linking for correction of keratoconus. Clin Ophthalmol 2016; 10:521-6. [PMID: 27041991 PMCID: PMC4809308 DOI: 10.2147/opth.s97158] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Purpose To assess the safety, predictability, and effectiveness of Keraring intrastromal corneal ring segments (ICRS) insertion assisted by femtosecond laser and corneal collagen cross-linking (CXL) for keratoconus correction. Patients and methods In this prospective, noncomparative, and interventional case series, 160 eyes of 100 adult keratoconus patients with poor best-corrected visual acuity (BCVA) (less than 0.7) and intolerance to contact lens wear were included. Patients underwent femtosecond laser-assisted placement of ICRS and CXL. All patients were examined for a complete ophthalmological test: uncorrected visual acuity (UCVA), BCVA, spherical equivalent, keratometry (K1-flat and K2-steep), pachymetry, and Scheimpflug imaging with the Pentacam at 1 week and at 1, 3, and 6 months postoperatively. Results At 6 months, a significant difference was observed (P<0.001) in mean UCVA and BCVA from 0.92±0.677 and 0.42±0.600 logMAR preoperatively to 0.20±0.568 and 0.119±0.619 logMAR, respectively. Mean spherical equivalent refractions were significantly lower (P<0.001) at 6 months. Mean keratometry (K) also significantly reduced (P<0.001) from 50.93±5.53 D (K1-flat) and 55.37±5.76 D (K2-steep) to 47.32±4.61 and 51.08±5.38 D, respectively. In terms of pachymetry, no significant difference was observed preoperatively versus postoperatively (P=1.000). Conclusion Keraring ICRS insertion assisted by femtosecond laser and corneal CXL provided significant improvement in visual acuity, spherical equivalent, and keratometry, which suggests that it may be effective, safe, and predictable for keratoconus correction.
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Affiliation(s)
- Osama Ibrahim
- Department of Ophthalmology, Alexandria University, Alexandria, Egypt
| | - Ahmed Elmassry
- Department of Ophthalmology, Alexandria University, Alexandria, Egypt
| | - Amr Said
- Department of Ophthalmology, Alexandria University, Alexandria, Egypt; Roayah Vision Correction Center, Alexandria, Egypt
| | | | - Hazem El Hennawi
- Department of Ophthalmology, Alexandria University, Alexandria, Egypt
| | - Ihab Osman
- Department of Ophthalmology, Alexandria University, Alexandria, Egypt
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Singh G, Harvey R, Dyne A, Said A, Scott I. Hospital discharge summary scorecard: a quality improvement tool used in a tertiary hospital general medicine service. Intern Med J 2015; 45:1302-5. [DOI: 10.1111/imj.12924] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2015] [Revised: 05/26/2015] [Accepted: 05/26/2015] [Indexed: 11/29/2022]
Affiliation(s)
- G. Singh
- Department of Internal Medicine; Princess Alexandra Hospital; Woolloongabba Queensland Australia
| | - R. Harvey
- Department of Internal Medicine; Princess Alexandra Hospital; Woolloongabba Queensland Australia
| | - A. Dyne
- Department of Internal Medicine; Princess Alexandra Hospital; Woolloongabba Queensland Australia
| | - A. Said
- Department of Internal Medicine; Princess Alexandra Hospital; Woolloongabba Queensland Australia
| | - I. Scott
- Internal Medicine and Clinical Epidemiology; Princess Alexandra Hospital; Brisbane Queensland Australia
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Affiliation(s)
- M.A. Abd‐Allah
- Electrical Engineering DepartmentFaculty of Engineering at ShoubraBenha UniversityCairoEgypt
| | - A. Said
- Electrical Engineering DepartmentFaculty of Engineering at ShoubraBenha UniversityCairoEgypt
| | - Mahmoud N. Ali
- Electrical Engineering DepartmentFaculty of Engineering at ShoubraBenha UniversityCairoEgypt
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Asaad T, Said A. Neuro-cognitive assessment in obstructive sleep apnea syndrome (OSAS) versus primary insomnia patients: A comparative study in an Egyptian sample. Sleep Med 2015. [DOI: 10.1016/j.sleep.2015.02.1436] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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A. Abd-Allah M, N. Ali M, Said A. Effective Factors on the Generated Transient Voltage in the Wind Farm due to Lightning. TELKOMNIKA 2015; 13. [DOI: 10.11591/telkomnika.v13i1.6844] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
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Said A, Helmy I, Hashem K, EssamEldin T. An unusual case of coronary artery fistula to the pulmonary artery, diagnosed with 64-MDCT coronary angiography. The Egyptian Journal of Radiology and Nuclear Medicine 2013. [DOI: 10.1016/j.ejrnm.2013.07.012] [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] Open
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Khidr A, Abd-Allah G, Said A, Fouad Y. Parasitological and Biochemical Studies on Chalcides ocellatus Inhabiting Damietta Region. Scientific Journal for Damietta Faculty of Science 2013; 2:89-96. [DOI: 10.21608/sjdfs.2013.194299] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
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Yin WG, Liu X, Tsvelik AM, Dean MPM, Upton MH, Kim J, Casa D, Said A, Gog T, Qi TF, Cao G, Hill JP. Ferromagnetic exchange anisotropy from antiferromagnetic superexchange in the mixed 3d-5d transition-metal compound Sr3CuIrO6. Phys Rev Lett 2013; 111:057202. [PMID: 23952439 DOI: 10.1103/physrevlett.111.057202] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2013] [Indexed: 06/02/2023]
Abstract
We report a combined experimental and theoretical study of the unusual ferromagnetism in the one-dimensional copper-iridium oxide Sr(3)CuIrO(6). Utilizing Ir L(3) edge resonant inelastic x-ray scattering, we reveal a large gap magnetic excitation spectrum. We find that it is caused by an unusual exchange anisotropy generating mechanism, namely, strong ferromagnetic anisotropy arising from antiferromagnetic superexchange, driven by the alternating strong and weak spin-orbit coupling on the 5d Ir and 3d Cu magnetic ions, respectively. From symmetry consideration, this novel mechanism is generally present in systems with edge-sharing Cu(2+)O(4) plaquettes and Ir(4+)O(6) octahedra. Our results point to unusual magnetic behavior to be expected in mixed 3d-5d transition-metal compounds via exchange pathways that are absent in pure 3d or 5d compounds.
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Affiliation(s)
- Wei-Guo Yin
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA.
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