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Stomal recurrence after total laryngectomy: a 10-year review in Universiti Kebangsaan Malaysia Medical Center

bte Abdul Rashid NH, Yunus MR, bte Baki MM, bte Ami M, Athar PP

J Pak Med Assoc, 2012 May;62(5):466-9.
PMID: 22755311

To determine the frequency of stomal recurrence in patients following total laryngectomy in our center and to compare the frequency of previously reported risk factors such as preoperative tracheostomy, subglottic invasion and the level of lymph node metastases, with the rest of the world.
Estimation of body height from spinal length measurements using post-mortem computed tomographic images

Zyoud TYT, Abdul Rashid SN, Suppiah S, Mahmud R, Kabeer A, Abd Manaf R, et al.

Malays J Pathol, 2020 Dec;42(3):423-431.
PMID: 33361724

INTRODUCTION: Post-mortem computed tomography (PMCT) provides information that helps in the determination of the cause of death and corpse identification of disaster victims. One of the methods for corpse identification includes assessment of the body stature. There is a lack of post-mortem imaging studies that focus on the anthropometric assessment of corpses. Our aim was to identify the relationship between cadaveric spine length and autopsy length (AL) among and autopsy length (AL) among a Malaysian population and derive a regression formula for the estimation of corpse body height using PMCT.
MATERIALS AND METHODS: We retrospectively assessed 107 cadavers that had undergone conventional autopsy and PMCT. We made 5 measurements from the PMCT that included cervical length (CL), thoracic length (TL), lumbosacral length (LS), total column length of the spine, excluding the sacrum and coccyx (TCL), and ellipse line measurement of the whole spine, excluding the sacrum and coccyx (EL). We compared these anthropometric PMCT measurements with AL and correlated them using linear regression analysis.
RESULTS: The results showed a significant linear relationship existed between TL and LS with AL, which was higher in comparison with the other parameters than the rest of the spine parameters. The linear regression formula derived was: 48.163 + 2.458 (TL) + 2.246 (LS).
CONCLUSIONS: The linear regression formula derived from PMCT spine length parameters particularly thoracic and lumbar spine gave a finer correlation with autopsy body length and can be used for accurate estimation of cadaveric height. To the best of our knowledge, this is the first ever linear regression formula for cadaveric height assessment using only post mortem CT spine length measurements.
Water quality influences on fish occurrences in sungai Pahang, Maran district, Pahang, Malaysia

Zulkafli Abdul Rashid, Mohammad Noor Azmai Amal

Sains Malaysiana, 2018;47:1941-1951.

This study assesses the influence of water quality on fish occurrences in Sungai Pahang, Maran District, Pahang, Malaysia. Water quality and fish samplings were conducted at seven sampling sites in the district for 13 consecutive months. We used canonical correspondence analyses (CCA) to determine the influence of water quality on monthly fish species occurrences. The ranges of water quality parameters were quite high considering the measurements were made during rainy and dry seasons throughout the year. A total of 2,075 individual fish was captured which comprised of 22 different families and 65 species. Family Cyprinidae recorded the highest number of fish species of the area (27 species; 41.5%), followed by Bagridae (five species; 7.69%) and Pangasiidae (five species; 7.69%). Three fish species categorized as endangered, including Balantiocheilos melanopterus, Probarbus jullieni and Pangasianodon hypophthalmus were also collected. The collected fish species were divided into three groups (A to C), which was clearly separated in the CCA ordination diagram. The most important water quality variables for the fish occurrences in this river were pH, followed by temperature, conductivity, alkalinity and phosphate. Data analysis indicates that the occurrence of fishes were influenced by a combination of water quality parameters, but not associated with sampling month. The results present a new data from a study of fish assemblage and their habitat condition which may be important in fisheries activity and fish conservation of the river in the future.
Fulltext An extendable optical fibre probe survey meter for naturally occurring radioactive material (NORM) and other weak emitters

Zubair HT, Bradley DA, Khairina MD, Oresegun A, Basaif A, Othman J, et al.

Sci Rep, 2023 Jul 24;13(1):11918.
PMID: 37488183 DOI: 10.1038/s41598-023-39180-9

We have developed a radioluminescence-based survey meter for use in industries in which there is involvement in naturally occurring radioactive material (NORM), also in support of those needing to detect other weak emitters of radiation. The functionality of the system confronts particular shortcomings of the handheld survey meters that are currently being made use of. The device couples a LYSO:Ce scintillator with a photodetector via a polymer optical fibre waveguide, allowing for "intrinsically safe" inspection within pipework, separators, valves and other such component pieces. The small-diameter optical fibre probe is electrically passive, immune to electromagnetic interference, and chemically inert. The readout circuit is entirely incorporated within a handheld casing housing a silicon photomultiplier (SiPM) detection circuit and a microprocessor circuit connected to an LCD display. A 15 m long flexible PMMA optical fibre waveguide is butt coupled to an ABS plastic probe that retains the LYSO:Ce scintillator. Initial tests have included the use of lab-based mixed gamma-ray sources, measurements being made in concert with a reference conventional GM survey-meter. Characterization, via NORM sources at a decontamination facility, has shown useful sensitivity, covering the dose-rate range 0.10- to 28 µSv h-1 (R-squared 0.966), extending to 80 µSv/h as demonstrated in use of a Cs-137 source. The system is shown to provide an effective tool for detection of radioactivity within hard to access locations, in particular for sources emitting at low radiation levels, down to values that approach background.
Orthodontic treatment need and demand among 12- and 16 year-old school children in Malaysia

Zreaqat M, Hassan R, Ismail AR, Ismail NM, Aziz FA

Oral Health Dent Manag, 2013 Dec;12(4):217-21.
PMID: 24390019

Assessment of orthodontic treatment need and demand helps in planning orthodontic services and estimating the required resources and man power. The aim of this study was to assess the orthodontic treatment need and demand and to assess the association between the orthodontic treatment demand and factors such as ITON, gender, and age.
Fulltext A Study on Regional GDP Forecasting Analysis Based on Radial Basis Function Neural Network with Genetic Algorithm (RBFNN-GA) for Shandong Economy

Zhang Q, Abdullah AR, Chong CW, Ali MH

Comput Intell Neurosci, 2022;2022:8235308.
PMID: 35126503 DOI: 10.1155/2022/8235308

Gross domestic product (GDP) is an important indicator for determining a country's or region's economic status and development level, and it is closely linked to inflation, unemployment, and economic growth rates. These basic indicators can comprehensively and effectively reflect a country's or region's future economic development. The center of radial basis function neural network and smoothing factor to take a uniform distribution of the random radial basis function artificial neural network will be the focus of this study. This stochastic learning method is a useful addition to the existing methods for determining the center and smoothing factors of radial basis function neural networks, and it can also help the network more efficiently train. GDP forecasting is aided by the genetic algorithm radial basis neural network, which allows the government to make timely and effective macrocontrol plans based on the forecast trend of GDP in the region. This study uses the genetic algorithm radial basis, neural network model, to make judgments on the relationships contained in this sequence and compare and analyze the prediction effect and generalization ability of the model to verify the applicability of the genetic algorithm radial basis, neural network model, based on the modeling of historical data, which may contain linear and nonlinear relationships by itself, so this study uses the genetic algorithm radial basis, neural network model, to make, compare, and analyze judgments on the relationships contained in this sequence.
Fulltext International Trade Path with Multi-Polarization based on Multidirectional Mutation Genetic Algorithm Enabled Neural Network

Zhang Q, Chong CW, Abdullah AR, Ali MH

Comput Intell Neurosci, 2021;2021:1370180.
PMID: 34691167 DOI: 10.1155/2021/1370180

At present, the development speed of international trade cannot catch up with the economic development speed, and the insufficient development speed of international trade will directly affect the rapid development of national economy. In order to solve the problem of international trade, the overall optimal scheduling of trade vehicles and the optimal planning of trade transportation path are very important to improve enterprise services, reduce enterprise costs, increase enterprise benefits, and enhance enterprise competitiveness. The second development of the program is based on the programming interface provided by Baidu map. This paper proposes a neural network algorithm for genetic optimization of multiple mutations, which overcomes the shortcoming of traditional genetic algorithm population "ten" character distribution by mixing multiple coding methods, and enhances the local search ability of genetic algorithm by introducing a new large-mutation small-range search population. The example application shows that the optimization method can realize the optimization of international trade path under real road conditions and greatly improve the work efficiency of actual trade.
Fulltext Multiplex real-time RT-PCR assay for diagnosis of Dengue, Zika and Chikungunya infections

Zarina Mohd Zawawi, Tengku Rogayah Tengku Abdul Rashid, Amir Hussien Adiee, Murni Maya Sari, Ravindran Thayan

Malaysian Journal of Medicine and Health Sciences, 2019;15(106):5-5.
MyJurnal

Introduction: Dengue virus (DENV), Zika virus (ZIKV) and Chikungunya virus (CHIKV) are Arboviruses that are transmitted by the same vector, Aedes aegypti. Dengue has become a global problem since the Second World War and is common in more than 110 countries. In Malaysia, dengue is a major disease burden as total economic costs to the country as a result of dengue is close to RM1.05 billion in 2010 and estimated to rise to 1.3 billion by 2020. Apart from Dengue, Zika and Chikungunya are the other important mosquito borne diseases in Malaysia. The aim of this study was to develop a multiplex real-time assay for simultaneous detection of DENV, ZIKV and CHIKV in clinical specimens. Methods: The published singleplex protocols were used with key modifications to implement a triplex assay. A one-step multiplex real-time RT-PCR assay was developed that can simultaneously detect RNA of DENV, ZIKV and CHIKV with good performance for a routine diagnostic use. The assay was evaluated for inter- and intra-reproducibility by mean CT value. The diagnostic sensitivity was tested with 135 archived samples which had been defined positive or negative by routine singleplex assays. Whole blood, plasma and urines were used in this study. Results: Intra- and inter-reproducibility and sensitivity varied from 0.10% to 4.73% and from 0.45% to 5.98% for each virus respectively. The specificity of detection was 100%. The multiplex real-time RT-PCR assay showed concordance with test results performed by routine singleplex assays. No cross reaction was observed for any of the clinical samples. Conclusion: The development of a rapid, sensitive and specific molecular assay for DENV, ZIKV and CHIKV infections will produce a greater diagnostic capacity in our laboratory. This multiplex approach is cost effective and robust with the concurrent detection of 3 viruses of public health concern.
Fulltext Perceptions of Quality of Life during the Pandemic: A Case Study on B40 Single Mothers

Zakaria SM, Abdullah N, Md Akhir N, Amin AS, Mohd Shukry ANA, Abdul Rashid MR, et al.

Int J Environ Res Public Health, 2022 Sep 27;19(19).
PMID: 36231521 DOI: 10.3390/ijerph191912219

During the pandemic, the lives of B40 single mothers were severely affected, especially in terms of social, economic, and psychological factors. The reduction of income caused by the crisis has forced single mothers and their children to live frugally and without luxury. They also had to perform more than one job at a time during the pandemic to meet their children's needs. A qualitative study has been conducted to explore the perceptions of quality of life during the pandemic among B40 single mothers. Respondents were selected based on demographic characteristics established before the study. A focus group discussion has been conducted on ten (10) B40 single mothers in Balik Pulau, Penang. Single mothers were selected based on purposive sampling. They had to meet the inclusive criteria required to participate in the study, specifically: aged between 20 and 60 years old, belonged to the B40 income category, had children under 18 years old living together, and became single mothers due to divorce or death of husbands. The focused group discussion explored issues related to qualities of life during the pandemic. B40 single mothers expressed their concern about access to health facilities, security in residence, children's education, and economic stability. These areas of life quality have been significantly affected especially during Movement Control Order (MCO). In short, the quality of life of these single mothers has been significantly affected by the pandemic. Their vulnerability towards stress, anxiety, and depression have worsened due to financial issues. Besides the need for emotional and social support, this study found that these single mothers entail financial support.
Fulltext Building partnership in oral cancer research in a developing country: processes and barriers

Zain RB, Ghani WM, Razak IA, Latifah RJ, Samsuddin AR, Cheong SC, et al.

Asian Pac J Cancer Prev, 2009 Jul-Sep;10(3):513-8.
PMID: 19640201

BACKGROUND: The rising burden of cancer in the developing world calls for a re-evaluation of the treatment strategies employed to improve patient management, early detection and understanding of the disease. There is thus an increasing demand for interdisciplinary research that integrates two or more disciplines of what may seemed to be highly unrelated and yet very much needed as strategies for success in research. This paper presents the processes and barriers faced in building partnerships in oral cancer research in a developing country.

METHODS: A case study was undertaken in a developing country (Malaysia) to assess the strengths and weaknesses of the situation leading to the formation of a multidisciplinary research partnership in oral cancer. Following the formalization of the partnership, further evaluation was undertaken to identify measures that can assist in sustaining the partnership.

RESULTS: The group identifies its strength as the existence of academia, research-intensive NGOs and good networking of clinicians via the existence of the government's network of healthcare provider system who are the policy makers. The major weaknesses identified are the competing interest between academia and NGOs to justify their existence due to the lack of funding sources and well trained human resources.

CONCLUSIONS: With the growing partnership, the collaborative group recognizes the need to develop standard operating procedures (SOPs) and guidelines for the sharing and usage of resources in order to safeguard the interest of the original partners while also attending to the needs of the new partners.
Comparison of Chlorella vulgaris dressing and sodium alginate dressing: an experimental study in rats

Zailan N, Abdul Rashid AH, Das S, Abdul Mokti NA, Hassan Basri J, Teoh SL, et al.

Clin Ter, 2010;161(6):515-21.
PMID: 21181079

Chlorella vulgaris (CV) is a green microalgae enriched with nutrients, vitamins, minerals and chlorophyll. The aim of our study was to evaluate the potential wound healing effects of CV as a dressing while comparing it to sodium alginate dressing.
Method optimization on the use of postocclusive hyperemia model to assess microvascular function

Yvonne-Tee GB, Rasool AH, Halim AS, Wong AR, Rahman AR

Clin. Hemorheol. Microcirc., 2008;38(2):119-33.
PMID: 18198413

Recent development had allowed non-invasive assessment of microvascular function in vivo; however, the method has not been fully optimized and standardized. In this study, we aimed to characterize the "effective" occlusion duration needed to elicit sufficient postocclusive hyperemia (PORH) responses in forearm skin using laser Doppler fluximetry (LDF), in subjects with differing age, gender and menstrual phases.
Noninvasive assessment of cutaneous vascular function in vivo using capillaroscopy, plethysmography and laser-Doppler instruments: its strengths and weaknesses

Yvonne-Tee GB, Rasool AH, Halim AS, Rahman AR

Clin. Hemorheol. Microcirc., 2006;34(4):457-73.
PMID: 16687786

Given that functional abnormalities of the microcirculation are one of the primary abnormalities in cardiovascular disease pathogenesis, various noninvasive clinical tools have been developed recently to assess the microvascular function, particularly at the skin. The common techniques used to assess cutaneous microvascular function in vivo include capillaroscopy, venous occlusion plethysmography, and laser-Doppler instruments (laser-Doppler fluximetry and laser-Doppler imaging). These noninvasive techniques can be used as an early measure of functional abnormalities within the microvascular tree, predominantly in population at high risk for cardiovascular events. This review discusses some underlying application principle of these techniques, including its clinical significance, method reproducibility and limitations.
Reproducibility of different laser Doppler fluximetry parameters of postocclusive reactive hyperemia in human forearm skin

Yvonne-Tee GB, Rasool AH, Halim AS, Rahman AR

J Pharmacol Toxicol Methods, 2005 Sep-Oct;52(2):286-92.
PMID: 16125628

Postocclusive reactive hyperemia in forearm skin is a commonly used model for studying microvascular reactivity function, particularly in the assessment of vascular effect of topically applied pharmacological substances. In this study, we investigated the reproducibility of several different laser-Doppler-derived parameters in the measurement of postocclusive reactive hyperemia at forearm skin in healthy subjects.
Fulltext The influence of angiotensin I-converting enzyme (ACE) I/D gene polymorphism on cardiovascular and muscular adaptations following 8 weeks of isometric handgrip training (IHG) in untrained normotensive males

Yusof HA, Aziz AR, Muhamed AMC

Biol Sport, 2019 Mar;36(1):81-94.
PMID: 30899143 DOI: 10.5114/biolsport.2019.79975

We examined the association between the angiotensin I-converting enzyme (ACE) I/D gene polymorphism and isometric handgrip (IHG) training on cardiovascular and muscular responses among normotensive males. Thirty (II = 10, ID = 10, and DD = 10) normotensive untrained males underwent IHG training at 30% of their maximal voluntary contraction 3 days per week for 8 weeks. Cardiovascular and muscular variables were measured before IHG, after a session of IHG and after 8 weeks of IHG. No significant interaction effect was found between ACE I/D genotype and IHG training session on all dependent variables (all p > 0.05). There was a significant main effect of IHG training session on systolic blood pressure (SBP) (p = 0.002), mean arterial pressure (MAP) (p = 0.015) and handgrip strength (HGS) (p = 0.001) scores, while no difference in diastolic blood pressure (DBP), pulse pressure, or heart rate scores was found. A greater improvement in cardiovascular parameters following 8 weeks of IHG training was observed in participants with the D allele than the I allele (SBP reduction: ID+DD genotype group (-5.53 ± 6.2 mmHg) vs. II genotype group (-1.52 ± 5.3 mmHg)); MAP reduction: ID + DD genotype group (-2.80 ± 4.5 mmHg) vs. II genotype group (-1.45 ± 3.5 mmHg). Eight weeks of IHG training improved cardiovascular and muscular performances of normotensive men. Reduction in SBP and MAP scores in D allele carriers compared to I allele carriers indicates that the ACE I/D polymorphism may have an influence on IHG training adaptation in a normotensive population.
Light intensity requirements for feeding behavior by the brown-marbled grouper, Epinephelus fuscoguttatus

Yukinori M, Leong SL, Kien CL, Mohamed Kamil Abdul Rashid, Shahbudin Saad

Sains Malaysiana, 2012;41:1193-1196.

In this study, we investigated the feeding behavior of the brown-marbled grouper, Epinephelus fuscoguttatus with light intensities ranging over eight orders of magnitude from 0–1000 lx to estimate the optimum light intensity for larval rearing. Artemia ingestion rates of E. fuscoguttatus of 36 days and 42 days old larvae were measured in feeding behavior experiments and they were significantly higher with light intensities ≥10 lx compared with feeding rates at ≤1 lx. E. fuscoguttatus larvae also exhibited Artemia ingestion rates in the dark or in dim lighting (0–1 lx) that were about 20% of the ingestion rates with ≥10 lx.
Numerical model for enhancing stimulated Brillouin scattering in optical microfibers

Yeap SH, Emami SD, Abdul-Rashid HA

F1000Res, 2021;10:521.
PMID: 37745939 DOI: 10.12688/f1000research.51029.2

Stimulated Brillouin scattering (SBS) is useful, among others for generating slow light, sensing and amplification. SBS was previously viewed as a poor method due to the limitation on optical power in high-powered photonic applications. However, considering the many possible applications using SBS, it is now of interest to enhance SBS in areas of Brillouin frequency shift together with Brillouin Gain. A numerical model, using a fully vectorial approach, by employing the finite element method, was developed to investigate methods for enhancing SBS in optical fiber. This paper describes the method related to the numerical model and discusses the analysis between the interactions of longitudinal, shear and hybrid acoustic modes; and optical modes in optical fiber. Two case studies were used to demonstrate this. Based on this numerical model, we report the influence of core radius, clad radius and effective refractive index on the Brillouin frequency shift and gain. We observe the difference of Brillouin shift frequency between a normal silica optical fiber and that of a microfiber - a uniformed silica fiber of a much smaller core and cladding dimensions where nonlinearities are higher. Also observed, the different core radii used and their respective Brillouin shift. For future work, the COMSOL model can also be used for the following areas of research, including simulating "surface Brillouin shift" and also to provide in-sights to the Brillouin shift frequency vB of various structures of waveguides, e.g circular, and triangular, and also to examine specialty fibers, e.g. Thulium and Chalcogenide doped fibers, and their effects on Brillouin shift frequency.
Absorption, distribution and elimination behaviours of cadmium treated by in vitro DIN from WLP residue using SAAM II modeling

Yasmin Mohd Idris Perama, Nur Shahidah Abdul Rashid, Syazwani Mohd Fadzil, Khoo Kok Siong

Sains Malaysiana, 2018;47:611-618.

Mathematically, the human alimentary tract organs were simplified in the model structure as separate compartments with
pathways of transfer that are kinetically homogenous and equally distributed. The development of gastro-compartment
model follows the first order kinetics of differential equations to describe cadmium absorption, distribution and elimination
in the human digestive system. With the aid of in vitro DIN assay, an artificial gastric and gastrointestinal fluid were
prepared using water leach purification (WLP) residue as a sample that contained toxic metals cadmium. The Simulation,
Analysis and Modelling II (SAAM II) V2.1 software is employed to design models easily, simulate experiments quickly and
analyze data accurately. Based on the experimental inputs and fractional transfer rates parameter incorporated to the
gastro-compartment model, the concentration of cadmium against time profile curves were plotted as the model output.
The curve presented concentration of cadmium in both gastric and gastrointestinal fluid where initially absorption phase
(first hour) occurred followed by the distribution phase (second to third hours) and elimination process (third to fifth
hours). The concentration of cadmium obtained from the simulated model structures was in good agreement with the
fitted model predicted measurements as statistical t-test conducted showed the values were not significantly different.
Therefore, modeling approach with SAAM II software gave realistic and better estimation of cadmium dissolution into
the human gastrointestinal tract.
Fulltext Survival analysis of osteosarcoma patients: A 15-year experience

Yasin NF, Abdul Rashid ML, Ajit Singh V

J Orthop Surg (Hong Kong), 2020 2 23;28(1):2309499019896662.
PMID: 32077796 DOI: 10.1177/2309499019896662

INTRODUCTION: Management of osteosarcoma has evolved considerably for the past two decades and there have been changes of practices especially pertaining to chemotherapy regime. This is a review of our cases in the past 15 years.
METHOD: This is a retrospective survival analysis study of 128 patients treated at University Malaya Medical Centre (UMMC) from 1997 to 2011.
RESULTS: There were 80 (62.5%) male and 48 (37.5%) female patients with the median age being 15 (5-59). Majority had osteosarcoma of extremities (94.5%). More than 60% patients developed metastasis throughout the course of treatment with 39% presenting with lung metastasis. Osteoblastic osteosarcoma was the commonest subtype (65.6%). Of the 109 patients treated surgically, 84 patients (65.6%) underwent limb salvage surgery while the rest underwent amputation. Seventy-one per cent of patients completed treatment with local recurrence rate of 22.7%. The 5-year and 10-year survival rates were 56.31% (95% CI: 46.20, 65.24) and 22.33% (95% CI: 14.86, 30.76), respectively. The 5-year event-free survival was 52.94% (95% CI: 41.83, 62.87). In multivariate analysis, the independent prognostic factors were presence of metastasis and completion of treatment for both 5-year and 10-year overall survival. Good histological response was only significant for multivariate analysis at 5 years. Patients with metastasis had a hazard ratio of 20.4 at 5 years and 3.26 at 10 years.
CONCLUSION: Overall survival rate for osteosarcoma patients at our centre was comparably higher than other centres in the region. Two independent risk factors for survival are metastatic status and completion of treatment. A standardized chemotherapy regime is essential for long-term survival.
How to Reduce Employees' Turnover Intention from the Psychological Perspective: A Mediated Moderation Model

Yan Z, Mansor ZD, Choo WC, Abdullah AR

Psychol Res Behav Manag, 2021;14:185-197.
PMID: 33633474 DOI: 10.2147/PRBM.S293839

Background: The hospitality industry is deemed a great generator of global GDP and employment. However, high rates of voluntary turnover have gradually undermined global service organizations and brought huge losses to them. Nowadays, the hotel sector continues to be plagued by high turnover rates.
Purpose: A research model investigating job attitudes (job satisfaction and organizational commitment) as mediators of the impact of psychological capital (PsyCap) on turnover intention and also examining position as a moderator between job attitudes and turnover intention was proposed and tested.
Methods: This study collected data from 406 employees selected from four-star and five-star hotels in the southwest region of China. Online survey questionnaires and a purposive sampling technique were employed in this study. Structural equation modeling was utilized to evaluate the direct, mediating, and moderating effects.
Results: The results showed that organizational commitment and job satisfaction fully mediated the association between PsyCap and turnover intention. Moreover, position played a moderating role on the effect of the aforementioned two job attitudes on turnover intention.
Conclusion: The findings implied that hoteliers should focus on employees' PsyCap and job attitudes in order to mitigate serious turnover issues in the hotel sector in China. Besides, the fact that position resulted in disparity impacts in the formation of turnover intention was evidenced.

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