MyMedR

Displaying publications 1 - 20 of 21 in total

Abstract:

Sort:

Factors influencing macrosomia in pregnant women in a tertiary care hospital in Malaysia

Yadav H, Lee N

J Obstet Gynaecol Res, 2014 Feb;40(2):439-44.
PMID: 24147966 DOI: 10.1111/jog.12209

To identify the risk factors influencing the development of macrosomia among pregnant women and to develop a regression model to predict macrosomia.
Fulltext Maternal factors in predicting low birth weight babies

Yadav H, Lee N

Med J Malaysia, 2013;68(1):44-7.
PMID: 23466766 MyJurnal

This study examines the association between maternal factors and low birth weight among newborns at a tertiary hospital in Malaysia. This was a cross-sectional study where mothers were followed through from first booking till delivery. There were 666 mothers who delivered from May 2007 to March 2008. Infants' birth weight were compared with maternal age, pre-pregnancy BMI, fathers BMI, parity, ethnicity, per capita monthly income, and maternal blood pressure during pregnancy. A multiple logistic regressions was used to determine the relationship of maternal factors and low birth weight, while the ROC curve was constructed to assess the sensitivity and specificity of the predictive model. Among the significant risk factors of low birth weight were older age (35 years and above), low pre-pregnancy BMI (<20 kg/m2), parity of 4 and above, Indian origin, economically under privileged, and low and high blood pressure. Blood pressure during pregnancy was an important risk factor for LBW, by using this parameter alone the risk of LBW could be predicted with a sensitivity rate of 70% and a specificity rate of 70%. The sensitivity and specificity was further improved to 80% and 75% percent respectively when other factors like maternal factors such as maternal age, pre-pregnancy BMI, ethnicity, and per capita monthly income were included in the analysis.
Flavonoid quercetin protects against swimming stress-induced changes in oxidative biomarkers in the hypothalamus of rats

Haleagrahara N, Radhakrishnan A, Lee N, Kumar P

Eur J Pharmacol, 2009 Oct 25;621(1-3):46-52.
PMID: 19744476 DOI: 10.1016/j.ejphar.2009.08.030

Quercetin is a bioflavonoid abundant in onions, apples, tea and red wine and one of the most studied flavonoids. Dietary quercetin intake is suggested to be health promoting, but this assumption is mainly based on mechanistic studies performed in vitro. The objective of this study was to investigate the effect of quercetin on stress-induced changes in oxidative biomarkers in the hypothalamus of rats. Adult male Sprague Dawley rats were subjected to forced swimming stress for 45 min daily for 14 days. Effect of quercetin at three different doses (10, 20 and 30 mg/kg body weight) on serum corticosterone and oxidative biomarkers (lipid hydroperoxides, antioxidant enzymes and total antioxidants) was estimated. Swimming stress significantly increased the serum corticosterone and lipid hydroperoxide levels. A significant decrease in total antioxidant levels and super oxide dismutase, glutathione peroxidase and catalase levels was seen in the hypothalamus after stress and treatment with quercetin significantly increased these oxidative parameters and there was a significant decrease in lipid hydroperoxide levels. These data demonstrate that forced swimming stress produced a severe oxidative damage in the hypothalamus and treatment with quercetin markedly attenuated these stress-induced changes. Antioxidant action of quercetin may be beneficial for the prevention and treatment of stress-induced oxidative damage in the brain.
Fulltext Training simulated patients: evaluation of a training approach using self-assessment and peer/tutor feedback to improve performance

Perera J, Perera J, Abdullah J, Lee N

BMC Med Educ, 2009;9:37.
PMID: 19563621 DOI: 10.1186/1472-6920-9-37

BACKGROUND: Most medical schools use simulated patients (SPs) for teaching. In this context the authenticity of role play and quality of feedback provided by SPs is of paramount importance. The available literature on SP training mostly addresses instructor led training where the SPs are given direction on their roles. This study focuses on the use of peer and self evaluation as a tool to train SPs.
METHODS: SPs at the medical school participated in a staff development and training programme which included a) self-assessment of their performance while observing video-tapes of their role play using a structured guide and b) peer group assessment of their performance under tutor guidance. The pre and post training performance in relation to authenticity of role play and quality of feedback was blindly assessed by students and tutors using a validated instrument and the scores were compared. A focus group discussion and a questionnaire assessed acceptability of the training programme by the SPs.
RESULTS: The post-training performance assessment scores were significantly higher (p < 0.05) than the pre-training scores. The degree of improvement in the quality of feedback provided to students was more when compared to the improvement of role play. The acceptability of the training by the SPs was very satisfactory scoring an average of 7.6 out of 10. The majority of the SPs requested the new method of training to be included in their current training programme as a regular feature.
CONCLUSION: Use of structured self-reflective and peer-interactive, practice based methods of SP training is recommended to improve SP performance. More studies on these methods of training may further refine SP training and lead to improvement of SP performance which in turn may positively impact medical education.
Fulltext Task-based learning: student’s perception of their skill in participating in small group discussions

Syed Aznal SA, Nurjahan MI, Lee N

International e-Journal of Science, Medicine & Education, 2009;3(1):-.
MyJurnal

Introduction: Task-based learning (TBL) has been accepted as an effective tool in teaching and learning activities in most medical schools. Many studies have looked at competencies and learning outcomes essential for undergraduates. Among the essential competencies are interpersonal skills and the ability to engage in a group discussion which this study has focused on. The evidence supporting higher interpersonal skills is however limited because many relevant competencies are hard to measure and require long observational periods.
Objective: To determine students’ self-perceived value of TBL in enhancing their interpersonal skills during the clinical phase.
Material and Methods: All students’ (semesters 6-10) in the clinical school of International Medical University (IMU) were invited to participate in this cross-sectional study done in December 2007 utilising a self-administered questionnaire with a 5-point Likert scale. It assessed the students’ perception on TBL sessions conducted during their clinical attachments in the various disciplines. Mean-scores, standard deviations, and confidence interval were used.
Results: Response rate was 62%. The results indicated that students were favorable in their opinion on TBL as a suitable forum for active communication and participation in group discussion. The results also show that both male and female students’ have similar perception. As for the comparison according to semesters, this showed that students’ maturity does not influence their perception as well.
Conclusion: In conclusion, the study has shown positive students’ perception on the effect of TBL on acquired skills such as interpersonal communication. Our findings are consistent with many earlier studies which show students’ perception of the method of learning as important factor in the enhancement of their interpersonal skills which is fundamental to clinical practice. Further research is necessary; long-term and larger scale observational studies would undoubtedly be optimal to minimise response bias.
Fulltext Developmental dysplasia of hip screening using ortolani and barlow testing on breech delivered neonates

Sulaiman A, Yusof Z, Munajat I, Lee N, Zaki N

Malays Orthop J, 2011 Nov;5(3):13-6.
PMID: 25279029 MyJurnal DOI: 10.5704/MOJ.1111.008
Formative feedback to students: the mismatch between faculty perceptions and student expectations

Perera J, Lee N, Win K, Perera J, Wijesuriya L

Med Teach, 2008;30(4):395-9.
PMID: 18569661 DOI: 10.1080/01421590801949966

Formative assessments and other learning tools are ineffective in the absence of formative feedback.
Fulltext Right internal carotid pseudoaneurysm mimicking a retropharyngeal abscess in a child

Lee NNA, Long G, Ngai S, Sahrir S, Parker A, Lamont AC

Med J Malaysia, 2004 Dec;59(5):685-7.
PMID: 15889576

A 7-year-old girl with tonsillar infection with antibiotics. Two weeks later, there was a right sided neck lump. Computed tomography scans demonstrated a predominantly hypodense right retropharyngeal area with peripheral enhancement and mass effect. There was intense enhancement within the postero-superior aspect of the lesion which was continuous with the right internal carotid artery. Ultrasound demonstrated tapering of the right internal carotid artery. Magnetic resonance imaging and magnetic resonance arteriography showed a right internal carotid artery pseudoaneurysm. Surgical exploration confirmed the finding. This case highlights an unusual presentation of an internal carotid pseudoaneurysm and how imaging provided the diagnosis.
WSAVA Animal Welfare Guidelines

Ryan S, Bacon H, Endenburg N, Hazel S, Jouppi R, Lee N, et al.

J Small Anim Pract, 2019 05;60(5):E1-E46.
PMID: 31026337 DOI: 10.1111/jsap.12998
WSAVA animal welfare guidelines for veterinary practitioners and veterinary teams

Animal Welfare Guidelines Group, Ryan S, Bacon H, Endenburg N, Hazel S, Jouppi R, et al.

J Small Anim Pract, 2019 05;60(5):265-267.
PMID: 30859578 DOI: 10.1111/jsap.12988
Fulltext Differential expression of the angiogenesis growth factors in psoriasis vulgaris

Liew SC, Das-Gupta E, Chakravarthi S, Wong SF, Lee N, Safdar N, et al.

BMC Res Notes, 2012;5:201.
PMID: 22537619 DOI: 10.1186/1756-0500-5-201

Angiogenesis has been reported to be one of the contributory factors to the pathogenesis of psoriasis vulgaris. This study aims to compare the expression of different angiogenesis growth factors namely (1) the vascular endothelial growth factor (VEGF) subfamily: A, B, C, D and placenta growth factor (PlGF); (2) nerve growth factor (NGF) and (3) von Willebrand factor (vWFr) in the skins of patients with psoriasis vulgaris and non-psoriatic volunteers.

Study site: Dermatology Department of Hospital Kuala Lumpur, Kuala Lumpur and Tuanku Ja’afar Hospital, Seremban, Malaysia
Expression of transforming growth factor-beta and determination of apoptotic index in histopathological sections for assessment of the effects of Apigenin (4', 5', 7'- Trihydroxyflavone) on Cyclosporine A induced renal damage

Chong FW, Chakravarthi S, Nagaraja HS, Thanikachalam PM, Lee N

Malays J Pathol, 2009 Jun;31(1):35-43.
PMID: 19694312

Cyclosporine A (CsA), a calcineurin inhibitor produced by the fungi Trichoderma polysporum and Cylindrocarpon lucidum, is an immunosuppressant prescribed in organ transplants to prevent rejection. Its adverse effect on renal dysfunction has limited its use in a clinical setting. Apigenin (4',5',7'-Trihydroxyflavone), a herbal extract, with anti-inflammatory and anti-tumour properties, has been investigated for properties to reverse this adverse effect. This research was conducted to establish a standard protocol for immunohistochemical estimation of Transforming Growth Factor beta (TGF-beta) expression, as an indicator of Cyclosporine A induced damage, and to observe whether apoptotic index and TGF-beta expression can be used to assess effects of Apigenin on CsA induced renal dysfunction. Six groups of 5 male Sprague-Dawley albino rats each were dosed once daily for 21 days, as follows: (1) negative control--oral corn oil, (2) positive control--Cyclosporine A (25 mg/kg), (3) Group 3--Apigenin (20 mg/kg), (4) Group 4--Cyclosporine A (25 mg/kg) +Apigenin (10 mg/kg), (5) Group 5--Cyclosporine A (25 mg/kg) +Apigenin (15 mg/kg) and (6) Group 6--Cyclosporine A (25 mg/kg) +Apigenin (20 mg/kg). Cyclosporine A was administered intra-peritoneally while Apigenin was given orally. The rat kidneys were harvested and examined microscopically to assess the apoptotic index, and stained by immunohistochemistry for multifunctioning polypeptide TGF-beta expression. A high apoptotic index and TGF-beta intensity was observed in the Cyclosporine A group. Apigenin significantly reduced the both apoptotic index and TGF-beta intensity. The apoptotic index correlated with TGF-beta intensity, especially in glomeruli. This study indicates that Cyclosporine A can enhance the TGF-beta expression in rat kidney, signifying accelerated apoptosis. TGF-beta and apoptotic index may be used to assess Apigenin and its effect on Cyclosporine A induced renal damage.
Fulltext Third ventricular cavernous angioma

Zakaria MA, Abdullah JM, George JP, Mutum SS, Lee NN

Med J Malaysia, 2006 Jun;61(2):229-32.
PMID: 16898318 MyJurnal

Third ventricular cavernous angiomas are rare vascular malformations of the brain. We report an eight-year old boy with a rare third ventricular cavernous angioma that hemorrhaged presenting with symptoms of acute hydrocephalus. Computed Tomography (CT) and Magnetic Resonance Imaging (MRI) showed a heterogenous ill-defined, solid and cystic intraventricular mass in the third ventricle which was mildly enhanced with contrast and there was associated hydrocephalus. The mass was removed with success and follow up after two years revealed no neurological abnormalities.
Fulltext Can Paediatric Femoral Fracture Hip Spica Application be Done in the Outpatient Setting?

Yap ST, Lee N, Ang ML, Chui RW, Lim K, Arjandas M, et al.

Malays Orthop J, 2021 Mar;15(1):105-112.
PMID: 33880156 DOI: 10.5704/MOJ.2103.016

Introduction: Hip spica casting is a standard treatment for children with femur fractures. This study compares the outcomes of spica cast application, in terms of quality of fracture reduction and hospital charges when performed in operating theatre versus outpatient clinics at a local institution.
Materials and Methods: A total of 93 paediatric patients, aged between 2 months to 8 years, who underwent spica casting for an isolated femur fracture between January 2008 and March 2019, were identified retrospectively. They were separated into inpatient or outpatient cohort based on the location of spica cast application. Five patients with metaphyseal fractures and four with un-displaced fractures were excluded. There were 13 and 71 patients in the outpatient and inpatient cohort respectively who underwent spica casting for their diaphyseal and displaced femur fractures. Variables between cohorts were compared.
Results: There were no significant differences in gender, fracture pattern, and mechanism of injury between cohorts. Spica casting as inpatients delayed the time from assessment to casting (23.55 ± 29.67h vs. 6.75 ± 4.27h, p<0.05), increased average hospital stay (41.2 ± 31.1h vs. 19.2 ± 15.0h, p<0.05) and average hospital charges (US$1857.14 vs US$775.49, p<0.05). Excluding the un-displaced fractures, there were no significant differences in the period of cast immobilisation and median follow-up length. Both cohorts had a similar proportion of unacceptable reduction and revision casting rate.
Conclusion: Both cohorts presented similar spica casting outcomes of fracture reduction and follow-up period. With spica cast application in operating theatre reporting higher hospital charges and prolonged hospital stay, the outpatient clinic should always be considered for hip spica application.
Animal Welfare Worldwide, the Opinion of Practicing Veterinarians

Endenburg N, Takashima G, van Lith HA, Bacon H, Hazel SJ, Jouppi R, et al.

J Appl Anim Welf Sci, 2020 01 28;24(3):215-237.
PMID: 31992080 DOI: 10.1080/10888705.2020.1717340

The objective of this study was to investigate the animal welfare issues considered the most important by companion animal veterinarians worldwide. For this purpose, a global survey of several potential animal welfare issues was distributed via SurveyMonkey® in multiple languages. The distribution of survey responses differed by region. The main animal welfare concern reported worldwide was obesity, although there were differences across regions, possibly due to cultural and socioeconomic factors. Anthropomorphism (attributing human qualities or characteristics to an animal) was an issue in western countries but less so in Asia, Africa, and Oceania. There were significant differences between Asia and Europe, Africa, and Oceania in the importance and prevalence of convenience euthanasia. There were also age and sex differences in participant responses, with older veterinarians reporting fewer welfare problems than younger veterinarians, and female veterinarians reporting more welfare issues than their male counterparts.
Fulltext Association of methylentetraydrofolate reductase (MTHFR) 677 C > T gene polymorphism and homocysteine levels in psoriasis vulgaris patients from Malaysia: a case-control study

Liew SC, Das-Gupta E, Wong SF, Lee N, Safdar N, Jamil A

Nutr J, 2012 Jan 05;11:1.
PMID: 22217364 DOI: 10.1186/1475-2891-11-1

BACKGROUND: The methylenetetrahydrofolate reductase (MTHFR) enzyme catalyzes the reduction of 5, 10-methylenetetrahydrofolate to 5-methyltetrahydrofolate and methyl donors. The methyl donors are required for the conversion of homocysteine to methionine. Mutation of MTHFR 677 C > T disrupts its thermostability therefore leads to defective enzyme activities and dysregulation of homocysteine levels.
METHODS: This case-control study (n = 367) was conducted to investigate the correlation of the MTHFR gene polymorphism [NM_005957] and psoriasis vulgaris amongst the Malaysian population. Overnight fasting blood samples were collected from a subgroup of consented psoriasis vulgaris patients and matched controls (n = 84) for the quantification of homocysteine, vitamin B12 and folic acid levels.
RESULTS: There was no significant increase of the MTHFR 677 C > T mutation in patients with psoriasis vulgaris compared with controls (χ(2) = 0.733, p = 0.392). No significant association between homocysteine levels and MTHFR gene polymorphism in cases and controls were observed (F = 0.91, df = 3, 80, p = 0.44). However, homocysteine levels in cases were negatively correlated with vitamin B12 (r = -0.173) and folic acid (r = -0.345) levels. Vitamin B12 and folic acid levels in cases were also negatively correlated (r = -0.164).
CONCLUSIONS: Our results indicate that there was no significant association between the MTHFR gene polymorphism and psoriasis vulgaris in the Malaysian population. There was no significant increase of the plasma homocysteine level in the psoriasis patients compared to the controls.
Partitioning of soil phosphorus among arbuscular and ectomycorrhizal trees in tropical and subtropical forests

Liu X, Burslem DFRP, Taylor JD, Taylor AFS, Khoo E, Majalap-Lee N, et al.

Ecol Lett, 2018 05;21(5):713-723.
PMID: 29536604 DOI: 10.1111/ele.12939

Partitioning of soil phosphorus (P) pools has been proposed as a key mechanism maintaining plant diversity, but experimental support is lacking. Here, we provided different chemical forms of P to 15 tree species with contrasting root symbiotic relationships to investigate plant P acquisition in both tropical and subtropical forests. Both ectomycorrhizal (ECM) and arbuscular mycorrhizal (AM) trees responded positively to addition of inorganic P, but strikingly, ECM trees acquired more P from a complex organic form (phytic acid). Most ECM tree species and all AM tree species also showed some capacity to take up simple organic P (monophosphate). Mycorrhizal colonisation was negatively correlated with soil extractable P concentration, suggesting that mycorrhizal fungi may regulate organic P acquisition among tree species. Our results support the hypothesis that ECM and AM plants partition soil P sources, which may play an ecologically important role in promoting species coexistence in tropical and subtropical forests.
Spread of drug-resistant Streptococcus pneumoniae in Asian countries: Asian Network for Surveillance of Resistant Pathogens (ANSORP) Study

Song JH, Lee NY, Ichiyama S, Yoshida R, Hirakata Y, Fu W, et al.

Clin Infect Dis, 1999 Jun;28(6):1206-11.
PMID: 10451154

Antimicrobial susceptibility of 996 isolates of Streptococcus pneumoniae from clinical specimens was investigated in 11 Asian countries from September 1996 to June 1997. Korea had the greatest frequency of nonsusceptible strains to penicillin with 79.7%, followed by Japan (65.3%), Vietnam (60.8%), Thailand (57.9%), Sri Lanka (41.2%), Taiwan (38.7%), Singapore (23.1%), Indonesia (21.0%), China (9.8%), Malaysia (9.0%), and India (3.8%). Serotypes 23F and 19F were the most common. Pulsed-field gel electrophoresis (PFGE) of 154 isolates from Asian countries showed several major PFGE patterns. The serotype 23F Spanish clone shared the same PFGE pattern with strains from Korea, Japan, Singapore, Taiwan, Thailand, and Malaysia. Fingerprinting analysis of pbp1a, pbp2x, and pbp2b genes of 12 strains from six countries also showed identical fingerprints of penicillin-binding protein genes in most strains. These data suggest the possible introduction and spread of international epidemic clones into Asian countries and the increasing problems of pneumococcal drug resistance in Asian countries for the first time.
Fulltext Imaging spectroscopy reveals the effects of topography and logging on the leaf chemistry of tropical forest canopy trees

Swinfield T, Both S, Riutta T, Bongalov B, Elias D, Majalap-Lee N, et al.

Glob Chang Biol, 2020 02;26(2):989-1002.
PMID: 31845482 DOI: 10.1111/gcb.14903

Logging, pervasive across the lowland tropics, affects millions of hectares of forest, yet its influence on nutrient cycling remains poorly understood. One hypothesis is that logging influences phosphorus (P) cycling, because this scarce nutrient is removed in extracted timber and eroded soil, leading to shifts in ecosystem functioning and community composition. However, testing this is challenging because P varies within landscapes as a function of geology, topography and climate. Superimposed upon these trends are compositional changes in logged forests, with species with more acquisitive traits, characterized by higher foliar P concentrations, more dominant. It is difficult to resolve these patterns using traditional field approaches alone. Here, we use airborne light detection and ranging-guided hyperspectral imagery to map foliar nutrient (i.e. P, nitrogen [N]) concentrations, calibrated using field measured traits, over 400 km2 of northeastern Borneo, including a landscape-level disturbance gradient spanning old-growth to repeatedly logged forests. The maps reveal that canopy foliar P and N concentrations decrease with elevation. These relationships were not identified using traditional field measurements of leaf and soil nutrients. After controlling for topography, canopy foliar nutrient concentrations were lower in logged forest than in old-growth areas, reflecting decreased nutrient availability. However, foliar nutrient concentrations and specific leaf area were greatest in relatively short patches in logged areas, reflecting a shift in composition to pioneer species with acquisitive traits. N:P ratio increased in logged forest, suggesting reduced soil P availability through disturbance. Through the first landscape scale assessment of how functional leaf traits change in response to logging, we find that differences from old-growth forest become more pronounced as logged forests increase in stature over time, suggesting exacerbated phosphorus limitation as forests recover.
Fulltext Logging and soil nutrients independently explain plant trait expression in tropical forests

Both S, Riutta T, Paine CET, Elias DMO, Cruz RS, Jain A, et al.

New Phytol, 2019 03;221(4):1853-1865.
PMID: 30238458 DOI: 10.1111/nph.15444

Plant functional traits regulate ecosystem functions but little is known about how co-occurring gradients of land use and edaphic conditions influence their expression. We test how gradients of logging disturbance and soil properties relate to community-weighted mean traits in logged and old-growth tropical forests in Borneo. We studied 32 physical, chemical and physiological traits from 284 tree species in eight 1 ha plots and measured long-term soil nutrient supplies and plant-available nutrients. Logged plots had greater values for traits that drive carbon capture and growth, whilst old-growth forests had greater values for structural and persistence traits. Although disturbance was the primary driver of trait expression, soil nutrients explained a statistically independent axis of variation linked to leaf size and nutrient concentration. Soil characteristics influenced trait expression via nutrient availability, nutrient pools, and pH. Our finding, that traits have dissimilar responses to land use and soil resource availability, provides robust evidence for the need to consider the abiotic context of logging when predicting plant functional diversity across human-modified tropical forests. The detection of two independent axes was facilitated by the measurement of many more functional traits than have been examined in previous studies.

Filters

Please provide feedback to Administrator (afdal@afpm.org.my)

External Links