Displaying publications 21 - 40 of 78 in total

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  1. Yeap JS, Noor Zehan AR, Ezlan S, Borhan Tan A, Harwant S
    Med J Malaysia, 2001 Jun;56 Suppl C:13-8.
    PMID: 11814242
    The functional outcome of 27 patients (16 males, 11 females) with a proximal humeral fracture was evaluated using the Simple Shoulder Test. Fifteen patients were also assessed using the Constant system. The mean age of the patients was 46.3 years (range 16-90 years) and the mean follow-up was 14 months (range 6-29 months). There were ten 2-part fractures, eight minimally displaced fractures, two 3-part fractures, three 4-part fractures, three 1-part fracture-dislocations and one 3 parts fracture-dislocation. Twenty-four fractures were treated conservatively and 3 surgically. Thirteen patients (48%) regained full function on the simple shoulder test and almost all regained range of movement sufficient for activities of daily living. Six patients were not able to return to their previous job. All patients were pain free at rest and were able to sleep on the affected side comfortably, although 9 patients had pain with activity, even though most pain were mild in nature. The mean Constant scores for the fractured arm and the normal arm were 72.5 points and 91 points respectively. The strength of shoulder abduction was reduced by a mean of 34%. Although the outcome was generally satisfactory, there was nevertheless a statistically significant deterioration of function following the fracture.
  2. Sarji SA, Abdullah BJ, Kumar G, Tan AH, Narayanan P
    Australas Radiol, 1998 Nov;42(4):293-5.
    PMID: 9833363
    A recognized cause of incomplete or cancelled MRI examinations is anxiety and claustrophobic symptoms in patients undergoing MR scanning. This appears to be a problem in many MRI centres in Western Europe and North America, where it is said to be costly in terms of loss of valuable scan time, and has led to researchers suggesting several anxiety-reducing approaches for MRI. To determine the incidence of failed MRI examination among our patients and if there are any associations with a patient's sex, age and education level, we studied claustrophobia that led to premature termination of the MRI examination in the University Malaya Medical Centre (UMMC) in 3324 patients over 28 months. The incidence of failed MRI examinations due to claustrophobia in the UMMC was found to be only 0.54%. There are associations between claustrophobia in MRI with the patients' sex, age and level of education. The majority of those affected were male patients and young patients in the 25-45-years age group. The patients' education level appears to be the strongest association with failed MRI examinations due to claustrophobia, where the majority of the affected were highly educated individuals. Claustrophobia in MRI is more of a problem among the educated individuals or patients from a higher socio-economic group, which may explain the higher incidence in Western European and North American patients.
  3. Qairul IH, Kareem BA, Tan AB, Harwant S
    Med J Malaysia, 2001 Dec;56 Suppl D:34-7.
    PMID: 14569764
    The forearm fracture is a fracture of the upper limb between the elbow and the wrist. It is a common injury in children, accounting for more than half of all children's fractures, and mostly occur when a child falls on the outstretched arm. A difficult clinical problem that often arises is how much angulation can be accepted in the child and how much remodeling will occur. One hundred consecutive cases of forearm fractures that were admitted at Childrens Orthopaedic Ward, Institute of Paediatrics at Hospital Kuala Lumpur between 1st January 1997 to 31st December 1998 were studied. We found that all fractures united 3 to 6 weeks, with a remodeling rate of about 2.5 degrees/month: the proximal fractures having the most potential to remodel. We conclude that the early remodeling potential of forearm fractures in children is 1.5 degrees/month in midshaft fractures and 2.5 degrees/month in distal and proximal fractures. We recommend accepting a 10-20 degree angulation in midshaft fractures, and a 20-30 degree angulation in metaphyseal fractures; based on our study of early remodeling potential.
  4. Goh SSL, Lai PSM, Tan ATB, Ponnampalavanar S
    Osteoporos Int, 2018 07;29(7):1683.
    PMID: 29737369 DOI: 10.1007/s00198-018-4379-y
    A meta-analysis was conducted to evaluate the prevalence of osteopenia/osteoporosis in human immunodeficiency virus (HIV)-infected individuals. The prevalence of osteopenia/osteoporosis in HIV-infected and antiretroviral therapy (ART)-treated individuals was significantly higher than respective controls. Evidence regarding bone loss within first year of HIV infection or ART initiation was preliminary.
  5. Tan ACC, Kumar HK, Lokeman Hazli FL, Chin L
    Med J Malaysia, 2021 09;76(5):624-629.
    PMID: 34508366
    INTRODUCTION: The use of intramuscular (IM) dexamethasone injections before an elective caesarean delivery at term has been shown in multiple randomized controlled trials to reduce the rates of transient tachypnoea of the newborn, and admission to neonatal care. Recent studies have suggested that a complete course of IM steroids can be associated with long term harmful consequences to the infants born, and there have been studies suggesting that a lower dose of IM corticosteroids can be beneficial. Therefore, we aim to establish if halving the dose of dexamethasone to 12mg can demonstrate any benefit for term elective caesarean section deliveries whilst minimizing foetal exposure.

    METHODS: An observational controlled study comparing neonatal respiratory morbidities before and after the single dose 12mg dexamethasone was implemented in our obstetrics and gynaecology centre for term elective caesarean section deliveries. We included singleton pregnancies from 37+0 to 38+6 weeks undergoing elective caesarean section into our study. A total of 674 patients fulfilled the inclusion criteria and were recruited. We compared the rates and duration of admission to neonatal intensive care unit, the need for mechanical ventilation and the rate of transient tachypnoea of the newborn in the first half of 2019 without IM dexamethasone injections against the second half of the year when a single dose IM dexamethasone was given.

    RESULTS: IM dexamethasone injection did not show any significant benefit with regards to reducing the admission to neonatal care (OR 0.97, p- value 0.69), admission to neonatal intensive care unit (OR 0.91, p- value 0.80), the need for mechanical ventilation (OR 0.98, p- value 0.95), and the incidence of transient tachypnoea of the newborn (OR1.01, p- value 0.96). There was also no significant difference for the duration of admission in the neonatal intensive care unit for both groups (p- value 0.17).

    CONCLUSIONS: This study showed that there was no significant benefit gained from the lower dose antenatal corticosteroids for term elective caesarean section deliveries and considering that there have been long term harmful consequences demonstrated from the higher dose of antenatal corticosteroids at term, this practice should therefore be discontinued until a larger study is done to refute these findings. The use of such dexamethasone should only be a viable option in a research setting.

  6. Goh SSL, Lai PSM, Tan ATB, Ponnampalavanar S
    Osteoporos Int, 2018 03;29(3):595-613.
    PMID: 29159533 DOI: 10.1007/s00198-017-4305-8
    A meta-analysis was conducted to evaluate the prevalence of osteopenia/osteoporosis in human immunodeficiency virus (HIV)-infected individuals. The prevalence of osteopenia/osteoporosis in HIV-infected and antiretroviral therapy (ART)-treated individuals was significantly higher than respective controls. Evidence regarding bone loss within first year of HIV infection or ART initiation was preliminary.

    PURPOSE: The aim of the study is to systematically review published literature on the prevalence of osteopenia/osteoporosis and its associated risk factors in HIV-infected individuals.

    METHODS: A literature search was conducted from 1989 to 2015 in six databases. Full text, English articles on HIV-infected individuals ≥ 18 years, which used dual X-ray absorptiometry to measure BMD, were included. Studies were excluded if the prevalence of osteopenia/osteoporosis was without a comparison group, and the BMD/T-score were not reported.

    RESULTS: Twenty-one cross sectional and eight longitudinal studies were included. The prevalence of osteopenia/osteoporosis was significantly higher in both HIV-infected [odds ratio (OR) = 2.4 (95%Cl: 2.0, 2.8) at lumbar spine, 2.6 (95%Cl: 2.2, 3.0) at hip] and ART-treated individuals [OR = 2.8 (95%Cl: 2.0, 3.8) at lumbar spine, 3.4 (95%Cl: 2.5, 4.7) at hip] when compared to controls. PI-treated individuals had an OR of 1.3 (95%Cl: 1.0, 1.7) of developing osteopenia/osteoporosis compared to controls. A higher proportion of tenofovir-treated individuals (52.6%) had lower BMD compared to controls (42.7%), but did not reach statistical significance (p = 0.248). No significant difference was found in the percent change of BMD at the lumbar spine, femoral neck, or total hip from baseline to follow-up between HIV-infected, PI-treated, tenofovir-treated, and controls. Older age, history of bone fracture, low BMI, low body weight, being Hispanic or Caucasian, low testosterone level, smoking, low CD4 cell count, lipodystrophy, low fat mass, and low lean body mass were associated with low BMD.

    CONCLUSIONS: The prevalence of osteopenia/osteoporosis in HIV-infected and antiretroviral therapy (ART)-treated individuals was two times more compared to controls. However, evidence concerning bone loss within the first year of HIV infection and ART initiation was preliminary.
  7. Lin HP, Chan LL, Tan A, Ariffin WA, Lam SK
    Bone Marrow Transplant, 1994 Jun;13(6):725-9.
    PMID: 7920303
    The sole BMT centre in Malaysia caters only for children. Since 1987, 89 transplants have been performed using reverse barrier nursing techniques. The overall survival rate is 73% with the majority of survivors leading normal lives. The early and late infection rates of 46% and 13%, respectively, are comparable to those of other centres. Although the early septicaemia rate is 36% the immediate mortality rate is < 10%. GVHD is less frequent and severe and the interstitial pneumonitis rate lower than that in the West. The average cost of US $8000 per transplant is much lower than the cost of a transplant performed overseas. Thus we believe that our paediatric BMT programme is simple and cost-effective.
  8. Müller M, Spiers AJ, Tan A, Mujahid A
    Sci Rep, 2023 Mar 12;13(1):4095.
    PMID: 36907954 DOI: 10.1038/s41598-023-31197-4
    Early Mortality Syndrome (EMS) has been a major problem for shrimp aquaculture in Southeast Asia due to its epizootic prevalence within the region since the first reported case in 2009. This study explores the application of halophilic marine bacilli isolated from coral mucus and their quorum-quenching abilities as potential biocontrol agents in aquaculture systems to combat the causative agent of EMS, Vibrio parahaemolyticus. N-acylhomoserine lactone (AHL)-degrading (AiiA) activity was first screened by PCR then confirmed by bio-reporter assay, and a combination of 16S rDNA sequence analysis and quantitative phenotype assays including biofilm-formation and temperature-growth responses were used to demonstrate diversity amongst these quorum-quenching isolates. Three phenotypically distinct strains showing notable potential were chosen to undergo co-cultivation as a method for strain improvement via long term exposure to the pathogenic V. parahaemolyticus. The novel approach taken led to significant improvements in antagonism and quorum quenching activities as compared to the ancestral wild-type strains and offers a potential solution as well as pathway to improve existing beneficial microbes for one of the most pressing issues in shrimp aquacultures worldwide.
  9. Armutcu B, Tan A, Amponsah M, Parida S, Ramkissoon H
    Acta Psychol (Amst), 2023 Oct;240:104025.
    PMID: 37741033 DOI: 10.1016/j.actpsy.2023.104025
    Social media and its applications are a part of daily life in Turkey and the rest of the world. In 2022, about 80.7 % of Turkey's population (69.9 million people) spent an average of 8 h daily using the Internet, providing a significant opportunity to encourage and influence tourists' purchase intentions through social media. This study aims to determine the effects of digital marketing and social media on tourist behaviours in Turkey. This study proposes a comprehensive model for the antecedents of tourists' behavioural intentions in their destination selection that can be found in the tourist destination online content (TDOC). The quality and user-friendly accessibility of the online information provides essential clues that influence tourists' behavioural intentions (intention to visit the destination and eWOM). Tourists' level of satisfaction with their first destination visits and the digital marketing interaction channels through which they share their experiences may positively affect their repeat visits/other tourists' behavioural intentions. Therefore, this study investigates the mediator effect of satisfaction and digital marketing interactions on the behavioural intentions of tourists of Eastern origin during their destination selection. Data was collected from 264 structured questionnaires and analyzed using partial least squares structural equation (PLS-SEM) modelling. Findings show that tourists' TDOC perceptions directly affect their behavioural intentions and that tourist satisfaction has a mediator role in the relationship between tourists' TDOC perceptions and behavioural intentions. Also, the results show that satisfaction and digital marketing interactions are important determinants of the intention to visit a tourist destination and eWOM intentions. Understanding tourists' perspectives on destination choice is crucial for policy makers, businesses and marketers as it will help formulate appropriate strategies to increase destination visits. In this respect, it is recommended to develop strategies to encourage tourists to share their experiences and satisfaction levels through digital marketing channels by improving the quality of products and services. Finally, the population of this study is limited to Turkey, and future research can extend this study to countries with different cultures and make new contributions to the related literature.
  10. Mallika P, Tan A, Asok T, Faisal H, Aziz S, Intan G
    Malays Fam Physician, 2008;3(3):140-5.
    PMID: 25606139 MyJurnal
    OBJECTIVES: To analyze the causes and characteristics of ocular injuries presenting to Sarawak General Hospital (SGH), Kuching.

    DESIGN: It is a prospective hospital-based study done for a period of 1 year.

    SETTING: Department of Ophthalmology, Sarawak General Hospital, Malaysia.

    PARTICIPANTS: All ocular injury patients seen for the first time in the Eye Department during the period January 2006 to December 2006 were included in the study. Eye injury patients on follow-up and treated elsewhere were excluded.

    RESULTS: A total of 233 patients, and 257 eyes, were studied. Men had six-fold higher rates of injury than women. The average age of presentation was 30 years. The predominant age group was between 21-30 years, 26.2 % (n=61). Eye injuries related to work were seen in 36.9% of patients. There was a gross negligence in the use of personal protective devices in the work-related group. The common settings in which the injuries occurred included home 34.3% (n=80) and industrial premises 31.8% (n=74). Assault-related injuries 7.7% (n=18) were seen mostly among young men in the age between 20-30 years. The initial presenting visual acuity of the patients with blunt ocular trauma was better than penetrating injury.

    CONCLUSION: Ocular injuries were common in young males. Work related eye injuries were noted in a significant number of cases. Health education and preventive strategies both in the working place and at home will help to decrease the occurrence of ocular injuries.

  11. Ratnasingam J, Karim N, Paramasivam SS, Ibrahim L, Lim LL, Tan AT, et al.
    Pituitary, 2015 Aug;18(4):448-55.
    PMID: 25134488 DOI: 10.1007/s11102-014-0593-6
    PURPOSE: Radiation fields for nasopharyngeal cancer (NPC) include the base of skull, which places the hypothalamus and pituitary at risk of damage. We aimed to establish the prevalence, pattern and severity of hypothalamic pituitary (HP) dysfunction amongst NPC survivors.

    METHODS: We studied 50 patients (31 males) with mean age 57 ± 12.2 years who had treatment for NPC between 3 and 21 years (median 8 years) without pre-existing HP disorder from other causes. All patients had a baseline cortisol, fT4, TSH, LH, FSH, oestradiol/testosterone, prolactin and renal function. All patients underwent dynamic testing with insulin tolerance test to assess the somatotroph and corticotroph axes. Baseline blood measurements were used to assess thyrotroph, gonadotroph and lactotroph function.

    RESULTS: Hypopituitarism was present in 82% of patients, 30% single axis, 28% two axes, 18% three axes and 6% four axes deficiencies. Somatotroph deficiency was most common (78%) while corticotroph, gonadotroph and thyrotroph deficiencies were noted in 40% (4 complete/16 partial), 22 and 4% of the patients respectively. Hyperprolactinaemia was present in 30% of patients. The development of HP dysfunction was significantly associated with the time elapsed from irradiation, OR 2.5 (1.2, 5.3), p = 0.02, for every 2 years post treatment. The use of concurrent chemo-irradiation (CCRT) compared to those who had radiotherapy alone was also significantly associated with HP dysfunction, OR 14.5 (2.4, 87.7), p < 0.01.

    CONCLUSION: Despite low awareness and detection rates, HP dysfunction post-NPC irradiation is common. Use of CCRT may augment time related pituitary damage. As these endocrinopathies result in significant morbidity and mortality we recommend periodic assessment of pituitary function amongst NPC survivors.

  12. Mallika PS, Aziz S, Goh PP, Lee PY, Cheah WL, Chong MS, et al.
    Med J Malaysia, 2012 Aug;67(4):369-74.
    PMID: 23082443
    This study aims to determine the risk factors associated with diabetic retinopathy (DR) among natives and non-natives Sarawakians who were seen at 3 public hospitals and one health clinic in Sarawak. It is a cross sectional study where data on patients with DM were collected by staff at these healthcare facilities and entered into the web-based Diabetic Eye Registry. Univariate and multivariate analysis was used to determine the association factors for DR. DR was significantly less associated with natives (24.4%) compared to non-native Sarawakians (34.1%) (p < 0.001). The odds of getting DR was higher in patients whose duration of DM was more than 20 years (OR = 2.6), who have renal impairment (OR = 1.7) and non-natives (OR = 1.4).
  13. Mallika PS, Chong YJ, Tan AK, Tang IP, Aziz S, Lee HK
    Med J Malaysia, 2011 Oct;66(4):361-2.
    PMID: 22299559 MyJurnal
    Intraorbital foreign bodies (IOrbFB) are associated with both sight and life threatening injuries. We report a case of an IOrbFB associated with retrobulbar hemorrhage and injury of the frontal sinus in an 11 year-old boy, after history of fall from the tree. Imaging studies revealed a metallic foreign body (FB) in the orbit and fracture of the walls of the frontal sinus. The usual entry route of an IOrbFB is either through the eye or orbital walls and extremely rare through the paranasal sinuses. This is the first reported case of a FB entering the orbit through the frontal sinus.
  14. Tan AK, Mallika P. S., Aziz S, Asokumaran T, Intan G, Faridah HA
    Malays Fam Physician, 2010;5(2):83-90.
    PMID: 25606193 MyJurnal
    OBJECTIVE: To determine the sensitivity and specificity of the conventional direct ophthalmoscope and the PanOptic ophthalmoscope in the detection of sight threatening retinopathy, as well as the "Ease of Use" of these equipments.
    METHODS: 200 diabetics, newly referred from primary health physicians were examined. Fundus examinations were performed with pupil dilatation in a dark room. The examinations were performed by a single investigator using the PanOptic ophthalmoscope, the conventional direct ophthalmoscope and slit lamp biomicroscopy.
    RESULTS: The overall sensitivity in detecting sight threatening retinopathy using the conventional direct ophthalmoscope was 73.2% (95% CI: 57.1-85.8%), specificity 93.7% (95% CI: 88.7-96.9%). For PanOptic ophthalmoscope, the overall sensitivity in detecting sight threatening retinopathy was 58.5% (95% CI: 42.1-73.7%), specificity 93.7% (95% CI: 88.7-96.9%). The conventional direct ophthalmoscope was 1.38 times (95% CI: 1.17-1.61 times) as easy to use compared to the PanOptic ophthalmoscope.
    CONCLUSION: The PanOptic ophthalmoscope is not superior to the conventional direct ophthalmoscope for the screening of Sight Threatening Retinopathy.
    KEYWORDS: PanOptic ophthalmoscope; conventional direct ophthalmoscope; sight threatening retinopathy
    Study site: Ophthalmology clinic, Sarawak General Hospital, Kuching, Sarawak, Malaysia
  15. Manzor NF, Chua KH, Tan GC, Tan AE, Abdul Rahman H
    Med J Malaysia, 2008 Jul;63 Suppl A:11-2.
    PMID: 19024960
    The objective of this study was to investigate the angiogenic potential of human chorion-derived stem cells (CDSC) cultured in medium containing bFGF and VEGF (EDM50). Total RNA was extracted from cells cultured in FD+10% FBS and EDM50. Quantitative RT-PCR was carried out to score the differential mRNA expression of genes involve in angiogenesis and endothelial differentiation. Our finding demonstrated that all angiogenic and endothelial associated genes were expressed higher in EDM50. Expression level of ANG-1, eNOS and VEGFR2 were significantly higher in EDM50 compared to FD+10% FBS. Our results suggested that human CDSC cultured in EDM50 can be used for angiogenesis purpose in regenerative medicine.
  16. Simat SF, Chua KH, Abdul Rahman H, Tan AE, Tan GC
    Med J Malaysia, 2008 Jul;63 Suppl A:53-4.
    PMID: 19024980
    The aim of the study is to evaluate the stemness gene expression of cultured human amniotic epithelial cells (HAECs) in serial passages. HAECs obtained from human term placentae were cultured in F12:DMEM(1:1) + 10% FBS +10ng/ml EGF in serial passages (P0, P1, P2 and P4). Quantitative RT-PCR was used to assess the gene expression analysis. The results showed that cultured HAECs expressed and downregulated the stemness genes expression for Oct-4, Sox-2, Nanog3, FGF4, Rex-1, FZD-9, BST-1 ABCG2. However, vimentin and nestin gene expression were upregulated. The results suggested that cultured HAECs may have pluripotent and multipotent properties.
  17. Tan GC, Simat SF, Abdul Rahman H, Tan AE, Chua KH
    Med J Malaysia, 2008 Jul;63 Suppl A:51-2.
    PMID: 19024979
    The aim of the study is to determine the neuronal and glial gene expression of cultured human amniotic epithelial cells (HAECs) in serial passages. HAECs obtained from human term placentae were cultured in F12:DMEM (1:1) + 10% FBS +10ng/ml EGF in serial passages. Quantitative RT-PCR was used to assess the gene expression analysis. The results showed that the cultured HAECs expressed the neural stem cell genes (Nestin, NSE and Vimentin), mature neuronal genes (TH, MAP-2, beta-III-tubulin and NFM) and glial genes (CNPase, MBP and Olig). These neural stem cell genes increased with serial passages while the genes expression for mature neuronal and glial cells were downregulated. These results suggested that HAECs may promote or involve in neurogenesis and gliagenesis.
  18. Abdul Rahman H, Manzor NF, Tan GC, Tan AE, Chua KH
    Med J Malaysia, 2008 Jul;63 Suppl A:57-8.
    PMID: 19024982
    Angiogenic induction was made to promote angiogenesis by differentiating stem cells towards endothelial cells. However, the stemness property of induced cells has not been revealed yet. Hence, we aim to evaluate the differential mRNA expression of stemness genes in human chorion-derived stem cells (CDSC) after being cultured in EDM50 comprised bFGF and VEGF. Results indicated that CDSC cultured in EMD50 expressed significantly higher mRNA level of Sox-2, FZD9, BST-1 and Nestin. In addition Oct-4, FGF-4 and ABCG-2 were also upregulated. Our finding suggested that CDSC after angiogenic induction enhanced its stem cell properties. This could be contributed for the mechanism of stem cell therapy in ischemic problem.
  19. Ngo CT, Alhady M, Tan AK, Norlasiah IS, Ong GB, Chua CN
    Med J Malaysia, 2007 Mar;62(1):74-5.
    PMID: 17682579
    A 3-year-old girl with facial dysmorphic features suggestive of Cornelia de Lange syndrome was seen in the ophthalmology unit for a right leukocoria. The leukocoria was found to be caused by a large retinoblastoma and the right eye was enucleated. Chromosomal analysis revealed partial chromosome 13q deletion involving band 14 which is associated with a high risk of retinoblastoma. This case shows that patient with chromosome 13q deletion syndrome cannot be diagnosed based on dysmorphic features only. Chromosomal analysis is warranted in all infants with facial dysmorphism suggestive of Cornelia de Lange syndrome so that those with chromosome 13q deletion can be referred early for early detection of retinoblastoma.
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