MyMedR

Displaying publications 101 - 120 of 205 in total

Abstract:

Sort:

Fulltext Neuroleptic malignant syndrome in Malaysia: a university hospital experience

Lee MK, Ong SB, Tan CT, Loh TG

Med J Malaysia, 1992 Sep;47(3):200-7.
PMID: 1362794

The neuroleptic malignant syndrome (NMS) is a potentially fatal complication of antipsychotic therapy. A retrospective study of nine patients seen over six years at the University Hospital, Kuala Lumpur (UHKL), is described. The estimated annualised incidence was 1.2 per 1000 in-patients with psychosis. No ethnic difference was detected. Clinical features were similar to experiences elsewhere, with wide variability seen in the severity of illness. The neuroleptic drugs implicated were haloperidol, trifluoperazine, chlorpromazine, fluphenazine and clopenthixol. Treatment consisted of withdrawal of offending drugs and supportive measures. Specific therapy was given to five patients. There was one death. At follow-up no deterioration was detected. A different neuroleptic drug was successfully re-introduced in four patients. In view of the wide usage of major tranquillizers, a high degree of clinical awareness of this serious complication is necessary for early diagnosis to reduce morbidity and mortality.
Six isoforms of cardiotoxin in malayan spitting cobra (Naja naja sputatrix) venom: cloning and characterization of cDNAs

Jeyaseelan K, Armugam A, Lachumanan R, Tan CH, Tan NH

Biochim. Biophys. Acta, 1998 Apr 10;1380(2):209-22.
PMID: 9565688

Cardiotoxins are the most abundant toxin components of cobra venom. Although many cardiotoxins have been purified and characterized by amino acid sequencing and other pharmacological and biochemical studies, to date only five cardiotoxin cDNAs from Taiwan cobra (Naja naja atra), three cDNAs from Chinese cobra (Naja atra) and two more of uncertain origin (either Chinese or Taiwan cobra) have been reported. In this paper we show the existence of four isoforms of cardiotoxin by protein analysis and nine cDNA sequences encoding six isoforms of cardiotoxins (CTX 1-3, 4a, 4b and 5) from N. n. sputatrix by cDNA cloning. This forms the first report on the cloning and characterization of several cardiotoxin genes from a single species of a spitting cobra. The cDNAs encoding these isoforms, obtained by reverse transcription-polymerase chain reaction (RT-PCR), were subsequently expressed in Escherichia coli. The native and recombinant cardiotoxins were first characterized by Western blotting and N-terminal protein sequencing. These proteins were also found to have different levels of cytolytic activity on cultured baby hamster kidney cells. Four of the isoforms (CTX 1, 2, 4 and 5) are unique to N. n. sputatrix, with CTX 2 being the most abundant species constituting about 50% of the total cardiotoxins. The isoform CTX 3 (20% constitution) is highly homologous to the cardiotoxins of N. n. atra and N. n. naja, indicating that it may be universally present in all Naja naja subspecies. Our studies suggest that the most hydrophilic isoform (CTX 5) could have evolved first followed by the hydrophobic isoforms (CTX 1, 2, 3 and 4). We also speculate that Asiatic cobras could be the modern descendants of the African and Egyptian counterparts.
Cryptococcosis at the University Hospital, Kuala Lumpur

Doi SA, Tan CT, Liam CK, Naganathan K

Trop Doct, 1998 Jan;28(1):34-9.
PMID: 9481195

We review our experience with 27 cases of pulmonary and meningeal cryptococcosis at the University Hospital, (Kuala Lumpar, Malaysia) where this is the most common cause of adult meningitis in patients without debilitating illnesses. Of the 27 cases analysed, six presented primarily with pulmonary symptomatology which usually were mainly cough, chest pain and low grade fever. The rest presented with primarily central nervous system (CNS) symptomatology of which headaches and fever were the most consistent symptoms although a third of these patients also had pulmonary lesions noted on chest radiographs. Treatment in all cases was with amphotericin B and 5-fluorocytosine and usually till a total cumulative dose of 1.5 g of amphotericin had been reached (an average of 10 weeks). Primary pulmonary presentations, if symptomatic, were treated as per CNS cryptococcosis due to the high likelihood of CNS dissemination. Incidental pulmonary cryptococcoma found on routine chest radiographs were confirmed by biopsy under ultrasound or fluoroscopy guidance and booked for surgical resection. Death usually occurred early in patients who presented late. Once patients responded to therapy, mortality was usually avoided. The only cause of morbidity in survivors was visual impairment or blindness, and this was attributed mainly to intracranial hypertension with residual deficits determined by the measures taken to lower intracranial pressures. Our experience suggests that: (i) symptomatic patients should have combination therapy with 5-fluorocytosine and amphotericin B till at least a cumulative dose of 1.5 g amphotericin B is reached irrespective of whether they have primary CNS or pulmonary symptomatology; (ii) non-symptomatic pulmonary cryptococcoma could be treated primarily by surgical resection; (iii) visual failure or papilloedema should be treated aggressively; and (iv) prognosis is good with adequate therapy and early presentation.
Analysis of 1,2(2,3)- and 1,3-positional isomers of diacylglycerols from vegetable oils by reversed-phase high-performance liquid chromatography

Lo SK, Baharin BS, Tan CP, Lai OM

J Chromatogr Sci, 2004 Mar;42(3):145-54.
PMID: 15023251

Separation of 1,2(2,3)- and 1,3-positional isomers of diacylglycerols (DAG) from vegetable oils by reversed-phase high-performance liquid chromatography (RP-HPLC) is investigated. The method is based on isocratic elution using 100% acetonitrile and UV detection at 205 nm. The following elution order of DAG molecular species is identified: 1,3-dilinolein < 1,2-dilinolein < 1,3-dimyristin < 1-oleoyl-3-linoleoyl-glycerol < 1,2-dimyristoyl-rac-glycerol < 1(2)-oleoyl-2(3)-linoleoyl-glycerol < 1-linolenoyl-3-stearoyl-glycerol < 1(2)-linolenoyl-2(3)-stearoyl-glycerol < 1,3-diolein < 1-palmitoyl-3-oleoyl-glycerol < 1,2-dioleoyl-sn-glycerol < 1(2)-palmitoyl-2(3)-oleoyl-glycerol < 1-linoleoyl-3-stearoyl-glycerol < 1,3-dipalmitin < 1(2)-linoleoyl-2(3)-stearoyl-glycerol < 1-oleoyl-3-stearoyl-glycerol < 1,2-dipalmitoyl-rac-glycerol < 1-palmitoyl-3-stearoyl-sn-glycerol < 1,3-distearin < 1,2-distearoyl-rac-glycerol. Linearity is observed over three orders of magnitude. Limits of detection and quantitation range 0.2-0.7 microg/mL for 1,3-dilinolein to 0.6-1.9 microg/mL for 1,2-dioleoyl-sn-glycerol, respectively. Precision and accuracy of the method are also demonstrated. The method is developed to separate mixtures of DAG molecular species produced from edible oils.
Fulltext In vitro antioxidant activities of extract and oil from roselle (Hibiscus sabdariffa L.) seed against sunflower oil autoxidation

Nyam KL, Teh YN, Tan CP, Kamariah L

Malays J Nutr, 2012 Aug;18(2):265-74.
PMID: 24575672 MyJurnal

In order to overcome the stability problems of oils and fats, synthetic antioxidants such as butylated hydroxyanisole (BHA), butylated hydroxytoluene (BHT) and tert-butyl hydroquinone (TBHQ) have widespread use as food additives in many countries. Recent reports reveal that these compounds may be implicated in many health risks, including cancer and carcinogenesis. Hence, there is a move towards the use of natural antioxidants of plant origin to replace these synthetic antioxidants.
Fulltext Dynamic hip screw compared to condylar blade plate in the treatment of unstable fragility intertrochanteric fractures

Yong CK, Tan CN, Penafort R, Singh DA, Varaprasad MV

Malays Orthop J, 2009;3(1):13-18.
MyJurnal

Dynamic hip screw (DHS) fixation is considered standard treatment for most intertrochanteric fractures. However, excessive sliding at the fracture site and medialisation of femoral shaft may lead in fixation failure. In contrast, fixed-angled 95Â° condylar blade plate (CBP) has no effective dynamic capacity and causes little bone loss compared to DHS. We compared the outcome of 57consecutive unstable intertrochanteric fragility fractures treated with these two fixation methods. CBP instrumentation is more difficult requiring longer incision, operating time and higher surgeon-reported operative difficulty. The six month post-operative mortality rate is 16%. Post-operative Harris hip scores were comparable between the two methods. Limb length shortening more than 20 mm was 6-fold more common with DHS. In elderly patients with unstable intertrochanteric fragility fractures, fixed angled condylar blade plate appears to be a better choice than dynamic hip screws for preventing fixation failures.
Fulltext Factors influencing the uptake of pap smear screening among malay women in a public university in Kuala Lumpur - a pilot study

Moy FM, Lim CH, Tan CJA, Tay SY

Malaysian Journal of Public Health Medicine, 2007;7(2):23-28.
MyJurnal

Cancer of the cervix is the second most common cancer among Malaysian women. Pap smear screening can detect precursors of cervical cancer. This paper attempts to determine the factors that influence the uptake of Pap smear screening. This was a cross sectional study with 112 Malay women recruited from a public university. A questionnaire enquiring sociademographic characteristics and health seeking behaviour based on the Health Belief Model was modified, translated and pre·tested. Testeretest reliability was also conducted. The mean age of the participants was 35.8 + 9.1 years. Majority was married and had at least secondary education. Only 62% of them had ever undergone Pap smear screening. Multiple logistic regression analysis showed women who were married or divorced (OR: 50.79, 95% C1: 4.33; 596.36), older age (OR: 1.12, 95% CI: 1.03; 1.22) or perceived higher benefits of Pap smear (OR; 4.80, 95% CI: 1.14; 20.15)
were more lilcely to have undergone Pap smear screening. Measures in reducing barriers and educating the public on the benefits of Pap smear are strongly recommended.
Fulltext Asthma control in Hospital Tengku Ampuan Afzan, Kuantan, Malaysia: a cross-sectional study

Kuan YC, Tan CH, Hong CM, How SH

International Medical Journal Malaysia, 2015;14(2):41-44.
MyJurnal

Introduction: Various initiatives and medications have been introduced to achieve better control of bronchial asthma. However total control according to Global Initiative for Asthma (GINA) remains elusive even at tertiary referral hospitals. Our study is to determine the level of asthma control (according to GINA 2009), Asthma Control Test (ACT) scores and the types of medications used among patients with bronchial asthma in a large tertiary hospital.
Methods: A cross-sectional study of all patients with bronchial asthma who attended the Chest Clinic at Hospital Tengku Ampuan Afzan (HTAA) from 2009 to 2011. Patient demographics, self-administered ACT scores, GINA-defined level of asthma control and medications were documented.
Results: 208 patients were recruited. There were 23.2%, 46.3% and 30.5% of patients with controlled, partly controlled and uncontrolled asthma respectively. The median ACT scores was 19 [inter quartile range (IQR) 6]. The most frequently used preventer therapy was inhaled long-acting β-agonist/corticosteroids (LABA/ICS) fixed-dose combination (61.7%), and 9.6% were not on preventer therapy. 75% of patients with controlled asthma were on LABA/ICS compared to 58.5% of the partly controlled and uncontrolled groups (p=0.039).
Conclusion: The majority of the asthmatic patients attending the Chest Clinic at HTAA did not have GINA-defined controlled asthma. Patients with higher ACT scores had better control of asthma. There were more patients with controlled asthma who were on LABA/ICS combination.
KEYWORDS: Bronchial asthma, level of control, Asthma Control Test
Study site: Chest Clinic, Hospital Tengku Ampuan Afzan (HTAA), Kuantan, Pahang, Malaysia
Device, Questionnaire & Scale: Asthma Control Test (ACT)
Fulltext Cultural adaptation and linguistic validation of the Beliefs about Medicines Questionnaire in Malaysia

Tan CS, Hassali MA, Neoh CF, Saleem F, Horne R

Value Health Reg Issues, 2018 May;15:161-168.
PMID: 29730249 DOI: 10.1016/j.vhri.2017.12.010

BACKGROUND: Low rate of adherence was found strongly associated with patients' beliefs across the studies about chronic diseases with hypertension. A crucial move is needed to bridge the gap between appropriate assessment tools and local hypertensive patients' medication adherence.

OBJECTIVE: To produce a translated version in Malay language of Beliefs about Medicines Questionnaire (BMQ) that was "conceptually equivalent" to the original English version for use in local clinical practice and research.

METHODS: The forward translation process was conducted by two independent professional translators and back translation was done by two other independent translators. A reliability analysis was conducted on 238 conveniently selected hypertensive patients. Intraclass correlation coefficient (ICC) was used to assess test-retest reliability for the randomly selected 40 patients in a period of 2 weeks. Discriminant validity was tested through Necessity-Concerns differential, BMQ subscales, and other parameters.

RESULTS: The overall Cronbach alpha for the internal consistency was good (0.860). The subscales of the BMQ demonstrated adequate internal consistency, with Cronbach alpha value of 0.759 for Specific-Necessity, 0.762 for Specific Concern, 0.624 for General-Overuse, and 0.756 for General-Harm. The ICC was excellent (0.922). Discriminant validity revealed that BMQ Specific-Necessity score was significantly inversely correlated with the systolic blood pressure level. Systolic and diastolic blood pressure levels (P = 0.038; P = 0.05) were reported to be significantly correlated with the Necessity-Concerns differential, with Necessity score equal or exceeding Concerns score.

CONCLUSIONS: The Malay-translated version of BMQ is a reliable and valid tool to assess patient belief about medication, especially medication adherence among the hypertensive patients in Malaysia.
Strong family history of nasopharyngeal carcinoma (NPC) in Bidayuh, a local native group in Sarawak, Malaysia

Yeo GG, Beh SP, Tan CK, Pei Jye V

Ann Oncol, 2018 Nov;29 Suppl 9:ix98-ix99.
PMID: 32178213 DOI: 10.1093/annonc/mdy438.017
Nasopharyngeal carcinoma in children and adolescent: A 10-year review in Sarawak General Hospital, Malaysia

Mohd Naseri NI, Lee RY, Nagaswara U, Tan CK, Pei Jye V

Ann Oncol, 2018 Nov;29 Suppl 9:ix97.
PMID: 32178210 DOI: 10.1093/annonc/mdy438.011
Vision loss in an immunocompetent child post varicella infection: A case report

Lee SC, Ng M, Tan CL, Ting SL

Malays Fam Physician, 2020;15(1):54-57.
PMID: 32284807

Chickenpox may lead to several neurological complications. Optic neuritis is one of the complications which has rarely been described, especially in immunocompetent individuals. We report a case of an 11-year-old immunocompetent girl who presented with sudden onset bilateral vision loss three weeks after varicella eruption. Ophthalmic examination revealed bilateral optic disc edema. Diagnosis of bilateral optic neuritis secondary to varicella was established based upon the preceding medical history, supported with clinical and radiological findings.
Fulltext Cross-reactivity in AED-Induced Severe Cutaneous Adverse Reaction: A Case Report

Khor AH, Lim KS, Tan CT, Kwan Z, Ng CC

J Investig Allergol Clin Immunol, 2016;26(5):329-331.
PMID: 27763865 DOI: 10.18176/jiaci.0085
Fulltext Rapid detection and serotyping of dengue virus by multiplex RT-PCR and real-time SYBR green RT-PCR

Yong YK, Thayan R, Chong HT, Tan CT, Sekaran SD

Singapore Med J, 2007 Jul;48(7):662-8.
PMID: 17609830

Dengue fever and dengue haemorrhagic fever currently rank highly among the newly-emerging infectious diseases, and are considered to be the most important arboviral disease worldwide. The definitive diagnosis is culture analysis, but practical considerations limit its use. Also, the period for viral detection is limited. Within a day or two after fever subsides, rising levels of antibodies interfere with viral cultures. An alternative to this quandary is the use of viral RNA detection assays. In our laboratory, a reverse transcriptase polymerase chain reaction (RT-PCR) assay was developed using a set of degenerate primers.
Oilomics: An important branch of foodomics dealing with oil science and technology

Zhang Y, Shi J, Tan C, Liu Y, Xu YJ

Food Res Int, 2023 Nov;173(Pt 1):113301.
PMID: 37803609 DOI: 10.1016/j.foodres.2023.113301

Oil is one of three nutritious elements. The application of omics techniques in the field of oil science and technology is attracted increasing attention. Oilomics, which emerged as an important branch of foodomics, has been widely used in various aspects of oil science and technology. However, there are currently no articles systematically reviewing the application of oilomics. This paper aims to provide a critical overview of the advantages and value of oilomics technology compared to traditional techniques in various aspects of oil science and technology, including oil nutrition, oil processing, oil quality, safety, and traceability. Moreover, this article intends to review major issues in oilomics and give a comprehensive, critical overview of the current state of the art, future challenges and trends in oilomics, with a view to promoting the optimal application and development of oilomics technology in oil science and technology.
Association of dengue serotypes and its complications: a retrospective cohort study

Lau Q, Lee ZM, Shunmugarajoo A, Tan CY, Azmel A, Yap SY

Med J Malaysia, 2023 May;78(3):372-378.
PMID: 37271848

INTRODUCTION: Dengue fever is an arthropod-borne disease and has a wide clinical spectrum. It is hypothesised that dengue serotypes could be a possible factor for such phenomena and therefore be a possible predictor for the development of severe dengue.
METHOD: A retrospective cohort study was done to explore the association between dengue serotypes and the various complications. All patients who underwent dengue serotyping from 1st January to 31st December 2018 in Tengku Ampuan Rahimah Hospital were selected. Serotypes were randomly done for admitted dengue patients. Notes were then retrieved for data collection. Secondary outcomes like length of stay and highest lactate level were also studied. Data analysis was done using SPSS version 20.
RESULT: A total of 193 patient records were included in the analysis. Chi-square test for independence indicated that the proportion of dengue complications between male and female were significantly different (χ2(1) = 11.37, p = 0.001). Dengue serotype was not associated with the development of dengue complications, total number of dengue complications, length of admission, lactate level and survival among the serotypes. Results of the binary logistic regression showed that men have thrice the odds (AOR = 3.3, 95% CI: 1.6 6.7) for developing dengue complications. One patient was found to be co-infected with serotype 2 and 3.
CONCLUSION: Our study did not reveal any association between the different dengue virus serotypes and its complications. Therefore, all dengue infection should be approached with equal meticulousness. There are possibilities that apart from serotype, dengue genotype and lineage would determine clinical outcome. However, more studies are required to study such associations.
Globus pharyngeus due to a lymphangiomatous polyp arising from the tonsil

Tan CX, Yeo SW, Wong YP, Tan GC

Malays J Pathol, 2023 Aug;45(2):271-273.
PMID: 37658536

INTRODUCTION: Lymphangiomatous polyp of the tonsil is generally accepted as a hamartomatous lesion. Its differential diagnosis includes fibroepithelial polyp, squamous papilloma, angiofibroma, haemangioma, arteriovenous malformation, hamartoma and lymphangioma.
CASE REPORT: A 33-year-old man presented with 2 months history of feeling of foreign body sensation in the throat. Examination revealed a nodular red coloured polyp on the left tonsil. Histologically, the polyp was covered by squamous epithelium and is composed of numerous vascular channels containing lymphocytes and eosinophilic material, in a fibrous stroma. Immunohistochemically, the endothelial cells were positive toward CD31 and D2-40.
DISCUSSION: The characteristic histological features of a lymphangiomatous polyp are benign vascular proliferation with variable fibrous, adipose and lymphoid stromal components. Nested intraepithelial epidermotropism of lymphocytes can be observed. The vascular channels are typically thin-walled and contain eosinophilic proteinaceous material and lymphocytes. There is no reported incidence of recurrent or malignant transformation.
Fulltext Toward a versatile toolbox for cucurbit[n]uril-based supramolecular hydrogel networks through in situ polymerization

Liu J, Soo Yun Tan C, Lan Y, Scherman OA

J Polym Sci A Polym Chem, 2017 Sep 15;55(18):3105-3109.
PMID: 28931970 DOI: 10.1002/pola.28667

The success of exploiting cucurbit[n]uril (CB[n])-based molecular recognition in self-assembled systems has sparked a tremendous interest in polymer and materials chemistry. In this study, polymerization in the presence of host-guest complexes is applied as a modular synthetic approach toward a diverse set of CB[8]-based supramolecular hydrogels with desirable properties, such as mechanical strength, toughness, energy dissipation, self-healing, and shear-thinning. A range of vinyl monomers, including acrylamide-, acrylate-, and imidazolium-based hydrophilic monomers, could be easily incorporated as the polymer backbones, leading to a library of CB[8] hydrogel networks. This versatile strategy explores new horizons for the construction of supramolecular hydrogel networks and materials with emergent properties in wearable and self-healable electronic devices, sensors, and structural biomaterials. © 2017 The Authors. Journal of Polymer Science Part A: Polymer Chemistry Published by Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017, 55, 3105-3109.
Fulltext Survey data to unveil the power of political crowdsourcing on social media

Tariq R, Zolkepli IA, Isawasan P, Tan C, Alhammad MM

Data Brief, 2024 Aug;55:110758.
PMID: 39156667 DOI: 10.1016/j.dib.2024.110758

This paper describes a dataset collected from a survey carried out in the United Kingdom, Malaysia, and Pakistan, to understand the variables that impact political trust. The data was collected from September to November 2021 via an online survey on Google Forms, and 472 valid responses were obtained. Drawing on relevant literature, the survey instrument was designed to cover the respondents' opinions concerning partisanship, social media utilization, online social capital, voluntary online and offline political participation, and political trust. The dataset offers useful insights for institutional practitioners and policymakers working in the domains of democracy and political communication, facilitating policy formulation to bolster political trust through collaborative crowdsourcing.
Chemopreventive potential of Annona muricata L leaves on chemically-induced skin papillomagenesis in mice

Hamizah S, Roslida AH, Fezah O, Tan KL, Tor YS, Tan CI

Asian Pac J Cancer Prev, 2012;13(6):2533-9.
PMID: 22938417

Annona muricata L (Annonaceae), commonly known as soursop has a long, rich history in herbal medicine with a lengthy recorded indigenous use. It had also been found to be a promising new anti-tumor agent in numerous in vitro studies. The present investigation concerns chemopreventive effects in a two-stage model of skin papillomagenesis. Chemopreventive effects of an ethanolic extract of A. muricata leaves (AMLE) was evaluated in 6-7 week old ICR mice given a single topical application of 7,12-dimethylbenza(α)anthracene (DMBA 100 μg/100 μl acetone) and promotion by repeated application of croton oil (1% in acetone/ twice a week) for 10 weeks. Morphological tumor incidence, burden and volume were measured, with histological evaluation of skin tissue. Topical application of AMLE at 30, 100 and 300 mg/kg significantly reduced DMBA/croton oil induced mice skin papillomagenesis in (i) peri-initiation protocol (AMLE from 7 days prior to 7 days after DMBA), (ii) promotion protocol (AMLE 30 minutes after croton oil), or (iii) both peri-initiation and promotion protocol (AMLE 7 days prior to 7 day after DMBA and AMLE 30 minutes after croton oil throughout the experimental period), in a dose dependent manner (p<0.05) as compared to carcinogen-treated control. Furthermore, the average latent period was significantly increased in the AMLE-treated group. Interestingly, At 100 and 300 mg/ kg, AMLE completely inhibited the tumor development in all stages. Histopathological study revealed that tumor growth from the AMLE-treated groups showed only slight hyperplasia and absence of keratin pearls and rete ridges. The results, thus suggest that the A.muricata leaves extract was able to suppress tumor initiation as well as tumor promotion even at lower dosage.

Filters

Please provide feedback to Administrator ([email protected])

External Links