MyMedR

Fulltext CFD analysis on indoor temperature and velocity: Effects of incident wind angle and outlet position

Ali, N.M., Abd Razak, A., Mohamad, M.F., Bahsan, R.

Pertanika Journal of Science & Technology, 2017;25(107):227-238.

MyJurnal

Ventilation is the process of exchanging air in a closed space to provide good indoor air quality. Computational Fluid Dynamics (CFD) has become one of the most important and reliable tools to assess natural ventilation. This paper presents the effect of wind direction on temperature and velocity inside a building with outlet windows at leeward wall and side wall. The CFD simulation was performed using Reynolds-Average Navier-Stoke (RANS) approach with k-ε model. The selection of standard k-ε model is due to suitability of this model to perform the wind speed profile and temperature profile inside the building. Validation of cross-ventilation is performed based on earlier Particular Image Velocimetry (PIV) measurements and shows very minimal discrepancy between CFD and PIV result. The result of velocity and temperature shows that the wind speed and temperature inside a building strongly depends on the incident winds angle and outlet opening of the building.

Villoglandular adenocarcinoma of cervix--a tumour with bland cytological features: report of a case missed on cytology

Jayaram G, Razak A

Malays J Pathol, 2003 Dec;25(2):139-43.

PMID: 16196371

The diagnosis of villoglandular adenocarcinoma of cervix on cytological smears is often missed due to the relatively bland cytological features of this tumour. A 45-year-old female with an exophytic cervical growth had three cervical smears reported as unsatisfactory. A cervical biopsy followed by Wertheim's hysterectomy showed a villoglandular adenocarcinoma (VGA) of cervix. Vaginal recurrence of VGA was again missed on the first post-operative vault smear. The second and third vault smears showed characteristic features of VGA that enabled correct identification. Review of some of the smears previously reported as unsatisfactory showed architectural features of VGA in the three dimensional (3-D) fragments that were previously considered to be benign.

The effect of filler content and processing variables on dimensional accuracy of experimental composite inlay material

Razak AA, Harrison A

J Prosthet Dent, 1997 Apr;77(4):353-8.

PMID: 9104710

Dimensional accuracy of a composite inlay restoration is important to ensure an accurate fit and to minimize cementation stresses.

Fulltext Prehypertensive state, mild hypertension, metabolic syndrome and cardiovascular risk factors among young adults in rural Malaysia

Abdullah Aszrin, Shah M. Azarisman, Rahman A. Jamaluddin, Razak A. Tariq, Noor M. Noriah

International Medical Journal Malaysia, 2018;17(1):47-54.

MyJurnal

Introduction: Prehypertension precedes overt hypertension and has been acknowledged by many guidelines.
Hypertension is an important risk factor for cardiovascular disease in Malaysia. Hypertension prevalence is
at 42.6% and population-based control is poor at 26.8%. The objective of the study is to ascertain the
cardiovascular risk profile of prehypertensive and mildly hypertensive young adults against age-matched
controls in rural Malaysia. Methods: 484 (four hundred and eighty four) subjects attending primary care
clinic were screened. 91 (Ninety one) young adults with pre/mild hypertension and normotensive, agematched controls were enrolled. The blood pressure and biochemical profiles for both groups were assessed
and compared. Results: Fifty-four subjects and 37 controls were enrolled. Amongst subjects, 46.3% had
prehypertension and 53.7% had mild hypertension. Mean values compared to age-matched controls for MAP
were 102.68 ± 7.48 vs 83.25 ± 6.08 mmHg (p< 0.001), LDL 3.75 ± 0.95 vs 3.32 ± 0.93 mmol/L (p=0.03), FBG
4.65 ± 0.54 vs 4.33 ± 0.42 mmol/L (p=0.03), BMI 28.81 ± 5.16 vs 24.12 ± 4.91 (p< 0.001). The mean BP was
significantly associated with BMI, FBG, triglycerides, HDL and the TC/HDL ratio. Conclusions: Greater BMI,
FBG, HDL, triglyceride levels and TC/HDL ratio characterised the young adults with pre/mild hypertension.
The data suggests that hypertension in young adults is secondary to metabolic syndrome.

Driver characteristics associated with child safety seat usage in Malaysia: a cross-sectional study

Kulanthayan S, Razak A, Schenk E

Accid Anal Prev, 2010 Mar;42(2):509-14.

PMID: 20159074 DOI: 10.1016/j.aap.2009.09.015

The rapidly motorizing environment in Malaysia has made child occupant safety a current public health concern. The usage of child safety seats (CSS) is a widely regarded intervention to enhance child occupant safety, yet no study has been conducted on CSS in Malaysia. This study aims to determine the CSS usage rates in Malaysia and to assess driver characteristics that are associated with CSS usage.

Removal of endocrine disrupting chemicals (EDCs) using low pressure reverse osmosis membrane (LPROM)

Razak AR, Ujang Z, Ozaki H

Water Sci Technol, 2007;56(8):161-8.

PMID: 17978444

Endocrine disrupting chemicals (EDCs) are the focus of current environmental issues, as they can cause adverse health effects to animals and human, subsequent to endocrine function. The objective of this study was to remove a specific compound of EDCs (i.e. pentachlorophenol, C(6)OCL(5)Na, molecular weight of 288 g/mol) using low pressure reverse osmosis membrane (LPROM). A cross flow module of LPROM was used to observe the effects of operating parameters, i.e. pH, operating pressure and temperature. The design of the experiment was based on MINITAB(TM) software, and the analysis of results was conducted by factorial analysis. It was found that the rejection of pentachlorophenol was higher than 80% at a recovery rate of 60 to 70%. The rejection was subjected to increase with the increase of pH. The flux was observed to be increased with the increase of operating pressure and temperature. This study also investigated the interaction effects between operating parameters involved.

Patterns of tooth vulnerability to caries in 20-24-year-old subjects

Razak IA, Razak AA

Odontostomatol Trop, 1988 Dec;11(4):145-8.

PMID: 3272009

Caries susceptibility of first permanent molars in 1808 schoolchildren aged 7-12 years

Razak IA, Razak AA

Singapore Dent J, 1984 May;9(1):23-5.

PMID: 6599645

Fine needle aspiration cytology of the thyroid--a review of experience in 1853 cases

Jayaram G, Razak A, Gan SK, Alhady SF

Malays J Pathol, 1999 Jun;21(1):17-27.

PMID: 10879275

1853 thyroid lesions subjected to cytological sampling (either by the fine needle aspiration or fine needle capillary sampling technique) from January 1992 to December 1997 at the University Hospital, Kuala Lumpur, were reviewed. Nodular goitre was the most common thyroid lesion needled (67.35%). Among the neoplastic lesions, follicular neoplasms predominated (64%), followed by papillary carcinoma (29.4%). In 325 cases, partial or total thyroidectomy had been done, providing material for histological review and cyto-histological correlation. Cytological diagnosis was found to have high sensitivity and specificity rates of over 75%. Besides, most non-neoplastic thyroid lesions could be diagnosed on cytology. The scope of cytology in the diagnosis of lymphomas, anaplastic and metastatic tumours rendered diagnostic biopsies (or thyroidectomy) unnecessary in these cases. Being a cost-effective technique and having the capacity to provide exact morphological diagnosis in a large variety of thyroid lesions, cytology is obviously the method of choice in the assessment of thyroid nodules.

Some mechanical properties of a highly cross-linked, microwave-polymerized, injection-molded denture base polymer

Memon MS, Yunus N, Razak AA

Int J Prosthodont, 2001 May-Jun;14(3):214-8.

PMID: 11484567

PURPOSE: The impact strength and the flexural properties of denture base materials are of importance in predicting their clinical performance upon sudden loading. This study compares the impact and transverse strengths and the flexural modulus of three denture base polymers.
MATERIALS AND METHODS: The investigation included a relatively new microwave-polymerized polyurethane-based denture material processed by an injection-molding technique, a conventional microwave-polymerized denture material, and a heat-polymerized compression-molded poly(methyl methacrylate) (PMMA) denture material. Impact strength was determined using a Charpy-type impact tester. The transverse strength and the flexural modulus were assessed with a three-point bending test. The results were subjected to statistical analysis using a one-way analysis of variance and the Scheffé test for comparison.
RESULTS: The impact strength of the microwave-polymerized injection-molded polymer was 6.3 kl/m2, while its flexural strength was 66.2 MPa. These values were lower than those shown by the two compression-molded PMMA-based polymers. The differences were statistically significant. The flexural modulus of the new denture material was 2,832 MPa, which was higher than the conventional heat-polymerized polymer but was comparable to the other microwave-polymerized PMMA-based polymer. The difference in the flexural modulus was statistically significant.
CONCLUSION: In terms of the impact and flexural strengths, the new microwave-polymerized, injection-molded, polyurethane-based polymer offered no advantage over the existing heat- and microwave-polymerized PMMA-based denture base polymers. However, it has a rigidity comparable to that of the microwave-polymerized PMMA polymer.

Prevalence of asthma, rhinitis and eczema among schoolchildren in Kelantan, Malaysia

Quah BS, Razak AR, Hassan MH

Acta Paediatr Jpn, 1997 Jun;39(3):329-35.

PMID: 9241894

The prevalence and severity of asthma, rhinitis and eczema in Kelantanese schoolchildren were determined as part of an international study of the epidemiology of asthma and allergic diseases. The international study of asthma and allergies in childhood (ISAAC) written questionnaire was administered to 7055 schoolchildren from February 1995 to August 1995. The respondents were parents or guardians of 5- to 7-year-old children (n = 3939), and schoolchildren aged 12-14 years (n = 3116). The ISAAC video questionnaire (AVQ3.0) was shown to children aged 12-14 years after the written questionnaire. The overall prevalences of 'ever wheezed' and 'wheezing in last 12 months' were 9.4 and 6.0% respectively. The prevalence of 'ever diagnosed with asthma' was 9.4%. Both 'ever wheezed' and 'wheezing in the last 12 months' were significantly higher in 12- to 14-year-old children than in 5- to 7-year-old children, with P values of 0.0006 and 0.014 respectively. No gender differences in the prevalences were observed. For the complete study group, 4.7% of children had sleep disturbed by wheezing but only 1.1% had a severe attack limiting speech in the preceding 12 months. Sleep disturbance was more common in the 12- to 14-year-old children than in 5- to 7-year-old children (P = 0.006). There was no difference between the age groups for severe attacks limiting speech. The overall prevalence of rhinitis and eczema symptoms were 27 and 12%, respectively. The prevalence of rhinitis in the 12-14 year age group (38.2%) was significantly higher (P < 0.0001) than in the 5-7 year age group (18.2%). The prevalence of eczema in the 5-7 year age group (13.7%) was significantly higher (P = < 0.0001) than in the 12-14 year age group (9.9%). These prevalence data are comparable with previous reports in Malaysian children, but are considerably lower than those reported for most developed countries.

Fulltext Cockroaches from urban human dwellings: isolation of bacterial pathogens and control

Vythilingam I, Jeffery J, Oothuman P, Abdul Razak AR, Sulaiman A

Southeast Asian J. Trop. Med. Public Health, 1997 Mar;28(1):218-22.

PMID: 9322309

A study was carried out to determine the distribution of cockroaches in two different housing areas with central sewerage or individual septic tanks in an urban area in Kuala Lumpur, Malaysia. Six species of cockroaches were present and of these Periplaneta americana and Periplaneta brunnea were found in greater abundance. Seventeen species of bacteria were isolated and of these Escherichia coli and Klebsiella p. pneumoniae were isolated in greatest numbers. Control measures carried out using lambda cyhalothrin showed that there was no significant difference between treated and control sites.

Fulltext The olivopontocerebellar atrophies. Report of 4 cases

Razak AR, Pratap RC, Gururaj AK

Med J Malaysia, 1988 Dec;43(4):344-7.

PMID: 3241600

Fulltext Aerodigestive amyloidosis presenting as acute asthma

Sreetharan SS, Prepageran N, Razak A, Valuyeetham KA

Med J Malaysia, 2003 Jun;58(2):290-3.

PMID: 14569753

Aerodigestive amyloidosis is a rare disorder characterized by fibrillar protein deposition in the aerodigestive tree. We present a case of a 19-year-old Chinese gentleman whose diagnosis was initially missed as he presented with features suggestive of severe bronchial asthma and was intubated and ventilated. He subsequently presented 2 years later with severe stridor and required emergency tracheostomy. Current literature is reviewed for the histopathology, common clinical features, radiological findings and treatment options for aerodigestive amyloidosis.

The effect of Dermo and Seal-In X5 prosthetic liners on pressure distributions and reported satisfaction during ramp ambulation in persons with transtibial limb loss

Ali S, Osman NA, Razak A, Hussain S, Wan Abas WA

Eur J Phys Rehabil Med, 2015 Feb;51(1):31-7.

PMID: 24963603

Lower limb amputee's are greatly affected in dealing with the environmental barriers such as ramps and stairs and reported high interface pressure between the residual limb and socket/liner. Interface pressure between the residual limb and socket/liner can affect the satisfaction and use of the prosthesis. Until now, little attention has been paid to interface pressure between socket and stump during ramp negotiation and its effect on amputee's satisfaction.

Fulltext Giant tracheocele

Razak A, Patil PH, Sahota JS, Subramanian S

J. Thorac. Cardiovasc. Surg., 2010 Mar;139(3):e27-8.

PMID: 19660304 DOI: 10.1016/j.jtcvs.2008.08.042

Evaluation of load at fracture of Procera AllCeram copings using different luting cements

Al-Makramani BMA, Razak AAA, Abu-Hassan MI

J Prosthodont, 2008 Feb;17(2):120-124.

PMID: 18047490 DOI: 10.1111/j.1532-849X.2007.00270.x

PURPOSE: The current study investigated the effect of different luting agents on the fracture resistance of Procera AllCeram copings.

METHODS: Six master dies were duplicated from the prepared maxillary first premolar tooth using nonprecious metal alloy (Wiron 99). Thirty copings (Procera AllCeram) of 0.6-mm thickness were manufactured. Three types of luting media were used: zinc phosphate cement (Elite), glass ionomer cement (Fuji I), and dual-cured composite resin cement (Panavia F). Ten copings were cemented with each type. Two master dies were used for each group, and each of them was used to lute five copings. All groups were cemented according to manufacturer's instructions and received a static load of 5 kg during cementation. After 24 hours of distilled water storage at 37 degrees C, the copings were vertically compressed using a universal testing machine at a crosshead speed of 1 mm/min.

RESULTS: ANOVA revealed significant differences in the load at fracture among the three groups (p < 0.001). The fracture strength results showed that the mean fracture strength of zinc phosphate cement (Elite), glass ionomer cement (Fuji I), and resin luting cement (Panavia F) were 1091.9 N, 784.8 N, and 1953.5 N, respectively.

CONCLUSION: Different luting agents have an influence on the fracture resistance of Procera AllCeram copings.

Contributory Factors for Severe Maternal Morbidity: A 10-Year Review of the Literature

Noor NM, Nik Hussain NH, Sulaiman Z, Abdul Razak A

Asia Pac J Public Health, 2015 Nov;27(8 Suppl):9S-18S.

PMID: 26069164 DOI: 10.1177/1010539515589811

Maternal morbidity is a concept of increasing interest in maternal health. This review aims to assess the contributory factors for severe maternal morbidity over the past one decade worldwide. A comprehensive electronic search was conducted. The search was restricted to articles written in the English language published from 2004 to 2013. Qualitative studies were excluded. A total of 24 full articles were retrieved of which 9 cohort, 7 case-control, 3 cross-sectional studies, and 5 unmentioned designs were included. The contributory factors were divided into 3 components: (a) sociodemographic characteristics, (b) medical and gynecological history, and (c) past and present obstetric performance. This review informs emerging knowledge regarding contributory factors for severe maternal morbidity and has implications for education, clinical practice and intervention. It enables a better understanding of the problem and serves as a foundation for the development of an effective preventive strategy for maternal morbidity and mortality.

Fulltext Primary sinonasal clear cell carcinoma: case report

Davina ST, Linda L, Abdul Razak A, Vijayaprakas Rao R, Norkamaruzaman E

Med J Malaysia, 2015 Apr;70(2):112-3.

PMID: 26162392 MyJurnal

Primary sinonasal clear cell carcinoma is a rare neoplasm classified under malignant epithelial tumours of salivary gland - type carcinomas under World Health Organization (WHO) classification. We report a case which occurred on a 69 year old gentleman presented with epistaxis and nasal endoscopy examination showed tumour arising from the right ethmoid cells. Endoscopic excision of the tumour was done and histopathological examination revealed clear cell carcinoma. In addition, other secondary or primary sites of the lesion were excluded by clinical, immunohistochemical and radiological examinations. 10 months into the postoperative period, patient remains well without recurrence of the tumour.

IN CONCLUSION: We report a rare case of primary sinonasal clear cell carcinoma in addition to the limited literature available and emphasize the differentials with other probable tumour through meticulous microscopic examination and use of special immunostains.
Keywords: Melaka

Incidence of pain after biomechanical preparation: a review of 302 cases treated by dental students

Mohd Sulong MZ, Abu-Hassan MI, Abdul Razak AA, Embong A

Singapore Dent J, 1996 Jul;21(1):31-5.

PMID: 10597181

Records of 302 root-filled teeth treated by dental undergraduates were reviewed by four lecturers in the Department of Conservative Dentistry, University of Malaya. Preoperative and operative factors were evaluated for their association with postoperative pain experience of patients during the visit immediately after completion of biomechanical preparation. Eighty four percent of patients did not experience any pain after biomechanical preparation whilst the remaining 16 percent only complained of slight or moderate pain. The incidence of pain after biomechanical preparation is not high even when performed by inexperienced undergraduates. Teeth with a pre-existing painful condition had a higher chances of postoperative of pain. The incidence of postoperative pain was halved when teeth were associated with a sinus tract.

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