MyMedR

Effects of Eurycoma longifolia Jack on sexual qualities in middle aged male rats

Ang HH, Ngai TH, Tan TH

Phytomedicine, 2003;10(6-7):590-3.

PMID: 13678248 DOI: 10.1078/094471103322331881

The effects of Eurycoma longifolia Jack were studied on the sexual qualities of middle aged male rats after dosing them with 0.5 g/kg of various fractions of E. longifolia whilst the control group received 3 ml/kg of normal saline daily for 12 weeks. Results showed than E. longifolia Jack enhanced the sexual qualities of the middle aged male rats by decreasing their hesitation time as compared to controls with various fractions of E. longifolia Jack produced 865-916 (91-96), 860-914 (92-98), 850-904 (93-99), 854-890 (95-99), 844-880 (94-98), 840-875 (94-98), 830-870 (94-98), 825-860 (94-98), 820-850 (96-99), 800-840 (93-98), 750-795 (94-99) and 650-754 sec (82-95%) in contrast to controls which produced 950 (100), 934 (100), 910 (100), 900 (100), 895 (100), 890 (100), 885 (100), 880 (100), 855 (100), 860 (100), 800 (100) and 790 sec (100%) throughout the investigation period. Besides these, there was a transient increase in the % of the male rats responding to the right choice after chronic administration of 0.5 g/kg E. longifolia Jack, with more than 50% of the male rats scored right choice after 2 weeks post-treatment and the effect was more prominent at the dose of the observation period. However, there was no sexual enhancement of the middle aged male rats which consumed normal saline since only 45-55% of the male rats responded to right choice throughout the investigation period. Hence, this study shows that E. longifolia Jack enhanced the sexual qualities of the middle aged male rats, further supports the folkuse of E. longifolia Jack as an aphrodisiac.

HPLC analysis of plasma 9-methoxycanthin-6-one from Eurycoma longifolia and its application in a bioavailability/pharmacokinetic study

Tan S, Yuen KH, Chan KL

Planta Med, 2002 Apr;68(4):355-8.

PMID: 11988862 DOI: 10.1055/s-2002-26751

A new and simple HPLC method using fluorescence detection was developed to determine 9-methoxycanthin-6-one, an active compound of Eurycoma longifolia Jack in rat and human plasma. The method entailed direct injection of plasma sample after deproteinization using acetonitrile. The mobile phase comprised acetonitrile and distilled water (55 : 45, v/v). Analysis was run at a flow rate of 1.0 ml/min with the detector operating at an excitation wavelength of 371 nm and emission wavelength of 504 nm. The method was specific and sensitive with a detection limit of 0.6 ng/ml and a quantification limit of approximately 1.6 ng/ml. The method was applied in a pilot pharmacokinetic/bioavailability study of the compound in rats. Less than 1 % of the compound was found to be absorbed orally.

Editorial for the Special Issue: Revolutionizing Regenerative Research Strategies Toward Precision Medicine-Asia-Pacific Region

Ramasamy R, Yahaya BH, Tan SL

Tissue Eng Part C Methods, 2022 10;28(10):499-500.

PMID: 36326783 DOI: 10.1089/ten.tec.2022.29035.editorial

Genetic markers in a Malaysian population: variants of uridine monophosphate kinase (UMPK), phosphoglycolate phosphatase (PGP) and pancreatic amylase (AMY2)

Zarinah KH, Abdullah F, Tan SG

Ann Hum Biol, 1984 11 1;11(6):533-6.

PMID: 6084457

Three genetic markers, red-cell UMPK, PGP and serum AMY2 were investigated in Malaysians of Malay, Chinese and Indian ancestries using starch-gel and agarose-gel electrophoresis. UMPK was found to be polymorphic in all three races. Variants were observed for PGP in Malays; in Indians it is a polymorphic marker whereas it is monomorphic in Chinese. AMY2 was polymorphic only in Indians. The UMPK1 frequencies in Malays, Chinese and Indians, respectively, are 0.851, 0.880 and 0.942. The PGP1 frequencies are 0.991, 1.000, 0.962, and the AMY1(2) frequencies are 1.000, 1.000 and 0.983.

Neuroimaging in refractory epilepsy. Current practice and evolving trends

Ramli N, Rahmat K, Lim KS, Tan CT

Eur J Radiol, 2015 Sep;84(9):1791-800.

PMID: 26187861 DOI: 10.1016/j.ejrad.2015.03.024

Identification of the epileptogenic zone is of paramount importance in refractory epilepsy as the success of surgical treatment depends on complete resection of the epileptogenic zone. Imaging plays an important role in the locating and defining anatomic epileptogenic abnormalities in patients with medically refractory epilepsy. The aim of this article is to present an overview of the current MRI sequences used in epilepsy imaging with special emphasis of lesion seen in our practices. Optimisation of epilepsy imaging protocols are addressed and current trends in functional MRI sequences including MR spectroscopy, diffusion tensor imaging and fusion MR with PET and SPECT are discussed.

Beyond Pattern Recognition: Radiology-Pathology-Clinical Correlation

Wong KT, Tan CT, Lim T

Neuroimaging Clin N Am, 2023 Feb;33(1):225-233.

PMID: 36404045 DOI: 10.1016/j.nic.2022.07.018

Radiology-pathology correlation is essential for multidisciplinary collaboration in diagnosis and understanding the mechanism of CNS damage in infectious processes. The microscopic acute inflammatory processes are well established and are supplemented by a variety of less-invasive microbial and immunohistochemical investigations. Understanding the pathogenesis of pathogen spread and neuroinvasion, vascular and immune-mediated brain, and spinal cord damage are essential for interpreting radiological images.

Simvastatin-loaded lyophilized wafers as a potential dressing for chronic wounds

Rezvanian M, Tan CK, Ng SF

Drug Dev Ind Pharm, 2016 Dec;42(12):2055-2062.

PMID: 27237190

Wafers are an established drug delivery system for application to suppurating wounds. They can absorb wound exudates and are converted into a gel, offering a moist environment that is vital for wound healing. Simvastatin-loaded lyophilized wafers were developed using sodium carboxymethyl cellulose (CMC) and methyl cellulose (MC) and evaluated for their potential in the management of chronic wounds. Simvastatin (SIM) was chosen as the model drug since it is known to accelerate wound healing by promoting angiogenesis and lymphangiogenesis. Pre-formulation studies were carried out with CMC, MC, and a mixture of CMC and MC. Wafers obtained from aqueous gels of 3% CMC and blend of CMC-MC in the % weight ratio of 2:1 and 1.5:1.5 were selected for further analysis. The formulated wafers were characterized by microscopic examination, texture analysis, hydration test, rheological studies, FTIR spectroscopy, water vapor transmission and drug release test. Among the selected formulations, simvastatin-loaded CMC-MC (2:1) wafers exhibited the most desired characteristics for wound dressing application, such as good flexibility, hardness, sponginess, and viscosity. It showed a sustained drug release, which is desirable in wound healing, and was more appropriate for suppurating wounds. In conclusion, simvastatin-loaded CMC-MC (2:1) wafers showing potential for wound dressing applications were successfully developed.

Design of a 24-hour controlled porosity osmotic pump system containing PVP: formulation variables

Yakubu R, Peh KK, Tan YT

Drug Dev Ind Pharm, 2009 Dec;35(12):1430-8.

PMID: 19929202 DOI: 10.3109/03639040902988566

The purpose of this study was to design a 24-hour controlled porosity osmotic pump system that utilizes polyvinyl pyrrolidone (PVP) as an osmotic-suspending/release retarding agent of drugs.

Relating in vitro/in vivo data of two controlled-release metformin formulations

Yuen KH, Peh KK, Tan BL

Drug Dev Ind Pharm, 1999 May;25(5):613-8.

PMID: 10219530

This study was conducted to compare the bioavailability of two controlled-release metformin preparations (Diabetmin Retard and Glucophage Retard) and also to correlate the in vitro and in vivo data obtained with the two preparations. Twelve healthy volunteers participated in the study, conducted according to a completely randomized, two-way crossover design. The preparations were compared using area under the plasma concentration-time curve AUC0-infinity, time to reach peak plasma concentration Tmax, and peak plasma concentration Cmax, while correlation was determined between in vitro release and in vivo absorption. Diabetmin Retard demonstrated a slower rate of in vitro release, but a faster rate of in vivo absorption than Glucophage Retard. However, the in vivo absorption of both products was found to be slower than that of drug released in vitro. A satisfactory relationship could be established between the in vitro and in vivo results, but there was no rank order correlation. No statistically significant difference was observed between the two preparations in the parameters AUC0-infinity and Cmax. However, a slight but statistically significant difference was observed between the Tmax values, but it may not be therapeutically significant. Moreover, the 90% confidence interval for the ratio of the logarithmic transformed AUC0-infinity values, as well as the logarithmic transformed Cmax values, of Diabetmin Retard over those of Glucophage Retard was within the acceptance criteria of 0.80-1.25.

Transdermal anti-inflammatory activity of bilayer film containing olive compound hydroxytyrosol: physical assessment, in vivo dermal safety and efficacy study in Freund's adjuvant-induced arthritic rat model

Ng SF, Tan LS, Buang F

Drug Dev Ind Pharm, 2017 Jan;43(1):108-119.

PMID: 27588411 DOI: 10.1080/03639045.2016.1224893

Previous studies have shown that hydroxytyrosol (HT) can be a potential alternative therapeutic agent for the treatment of rheumatoid arthritis (RA). However, HT is extensively metabolized following oral administration, which leads to formulating HT in a topical vehicle to prolong drug action as well as to provide a localized effect. Hidrox-6 is a freeze-dried powder derived from fresh olives and contains a high amount of HT (∼3%) and other polyphenols. Alginate bilayer films containing 5% and 10% Hidrox-6 were formulated. The films were characterized with respect to their physical, morphology, rheological properties; drug content uniformity; and in vitro drug release. Acute dermal irritancy tests and a skin sensitization study were carried out in rats. An efficacy study of the bilayer films for RA was conducted using Freund's adjuvant-induced polyarthritis rats. Animal data showed that the bilayer film formulations did not cause skin irritancy. The efficacy in vivo results showed that the Hidrox-6 bilayer films lowered the arthritic scores, paw and ankle circumference, serum IL-6 level and cumulative histological scores compared with those measured for controls. The topical Hidrox-6 bilayer films improve synovitis and inflammatory symptoms in RA and can be a potential alternative to oral RA therapy.

What do we know about porcine circovirus 3 (PCV3) diagnosis so far?: A review

Tan CY, Lin CN, Ooi PT

Transbound Emerg Dis, 2021 Nov;68(6):2915-2935.

PMID: 34110095 DOI: 10.1111/tbed.14185

Porcine circovirus 3 (PCV3) was first discovered in 2016, almost concomitantly by two groups of researchers in the United States. The novel case was reported in a group of sows with chronic reproductive problems with clinical presentation alike porcine dermatitis and nephropathy syndrome (PDNS), where metagenomic sequencing revealed a genetically divergent porcine circovirus designated PCV3. The discovery of PCV3 in a PDNS case, which used to be considered as part of PCVAD attributed to PCV2 (porcine circovirus 2), has garnered attention and effort in further research of the novel virus. Just when an infectious molecular DNA clone of PCV3 has been developed and successfully used in an in vivo pathogenicity study, yet another novel PCV strain surfaced, designated PCV4 (porcine circovirus 4). So far, PCV3 has been reported in domestic swine population globally at low to moderate prevalence, from almost all sample types including organ tissues, faecal, semen and colostrum samples. PCV3 has been associated with a myriad of clinical presentations, from PDNS to porcine respiratory disease complex (PRDC). This review paper summarizes the studies on PCV3 to date, with focus on diagnosis.

Parapharyngeal abscess complicated by endophthalmitis: a rare presentation of nasopharyngeal carcinoma

Tan VE, Jeevanan J, Lee BR

J Laryngol Otol, 2008 Aug;122(8):867-70.

PMID: 17498332 DOI: 10.1017/S0022215107008195

We report an extremely rare case of nasopharyngeal carcinoma presenting as a lateral neck abscess complicated by endogenous bacterial endophthalmitis. Endogenous bacterial endophthalmitis complicating a neck abscess has not been reported in the recent English literature. We discuss the possible pathophysiology of neck abscess as a presenting feature of nasopharyngeal carcinoma, and the relationship between the parapharyngeal abscess and endogenous bacterial endophthalmitis.

Hidden cause of intestinal bleeding from jejunal diverticulum revealed on enteroscopy and treated successfully with segmental resection

Kamaruddin NT, Tan JH, Teh JZ

ANZ J Surg, 2021 Nov 30.

PMID: 34850526 DOI: 10.1111/ans.17400

Optical enzymatic formaldehyde biosensor based on alcohol oxidase and pH-sensitive methacrylic-acrylic optode membrane

Nurlely, Ahmad M, Heng LY, Tan LL

Spectrochim Acta A Mol Biomol Spectrosc, 2022 Feb 15;267(Pt 2):120535.

PMID: 34749257 DOI: 10.1016/j.saa.2021.120535

Optical biosensor for the detection of formaldehyde has been developed based on the transparent enzymatic stacked membranes system on the glass substrate, and employing optical absorption transducer with H+ ion-selective Nile Blue chromoionophore (NBCM) dye-doped methacrylic acrylic (MB28) copolymer membrane as the optode membrane. Alcohol oxidase (AOx) enzymes were entrapped within the biocompatible sol-gel matrix and deposited on top of the pH optode membrane. As the uppermost catalytic membrane catalyzes the oxidative conversion of formaldehyde to formic acid and hydrogen peroxide, the immobilized NBCM undergoes protonation reaction and forms HNBCM+, the dark blue ion-chromoionophore complex via H+ ion transfer reaction within the soft and flexible MB28 polymeric membrane. This rendered the enzymatic optode membrane absorbed a high yellow light intensity from the light source and exhibited maximum absorption peaks at 610 and 660 nm. Optical evaluation of formaldehyde by means on UV-vis absorption transduction of the enzymatic stacked membranes demonstrated rapid response time of 10 min with high sensitivity, good linearity and high reproducibility across a wide formaldehyde concentration range of 1 × 10-3-1 × 103 mM (R2 = 0.9913), and limit of detection (LOD) at 1 × 10-3 mM, which could be useful for formaldehyde assay in industrial, agricultural, environmental, food and beverages as well as medical samples. The formaldehyde concentration in snapper fish, pomfret fish and threadfin fish samples determined by the proposed optical enzymatic biosensor were very much close to the formaldehyde concentration values determined by the UV-vis spectrophotometric NASH standard method based on the statistical t-test. This suggests that the optical biosensor can be used as a reliable method for quantitative determination of formaldehyde levels in food samples.

Stressful life events and depressive symptoms among adolescents in Malaysia: the mediating role of maladaptive cognitive schema

Wong YS, Zulkefly NS, Tan KA

Int J Adolesc Med Health, 2020 Jun 08;33(6):493-500.

PMID: 32549164 DOI: 10.1515/ijamh-2019-0228

OBJECTIVES: The present study aimed to examine the mediational role of maladaptive cognitive schema in the association between stressful life events, which are operationalised as major (i. e. negative life events) and minor (i. e. daily hassles) life stressors, and depressive symptoms among adolescents.

METHODS: A cross-sectional correlational study was conducted to recruit participants across four selected states of Kedah, Kelantan, Melaka and Selangor in Peninsular Malaysia. This study involved a total of 1,032 adolescents from 25 government secondary schools, identified using probability proportional to size cluster sampling technique. Data were collected through a self-report questionnaire.

RESULTS: Using structural equation modelling analyses, findings revealed a full mediation effect of maladaptive cognitive schema between negative life events and depressive symptoms, and a partial mediation effect between daily hassles and depressive symptoms.

CONCLUSIONS: This study provided valuable insights about the significance of maladaptive cognitive schema as a mediator in the stress-depression association and advanced the understanding of mechanism underlying development of depressive symptoms among adolescents in Malaysia. Findings also benefit the clinical practice in the development of targeted depression prevention and intervention programs.

A three-dimensional exoscope system for bilateral simultaneous cochlear implant surgery: how I do it

Tan SH, Kulasegarah J, Prepageran N

J Laryngol Otol, 2022 Jan 07.

PMID: 34991738 DOI: 10.1017/S002221512100431X

Hemoperitoneum after accidental dislodgement and subsequent replacement of PEG tube

Tan YM, Abdullah M, Goh KL

Gastrointest Endosc, 2001 May;53(6):671-3.

PMID: 11323604

Intrahepatic biloma: an unusual complication of cholangiocarcinoma treated endoscopically

Ranjeev P, Goh KL, Rosmawati M, Tan YM

Gastrointest Endosc, 1999 Nov;50(5):711-3.

PMID: 10536338

Author reply: The relationship between alcohol intake and falls

Myint PK, Tan MP, Khaw KT

Geriatr Gerontol Int, 2022 01;22(1):91-92.

PMID: 34755445 DOI: 10.1111/ggi.14308

Falls in older persons with type 2 diabetes in the Malaysian Elders Longitudinal Research (MELoR) study

Ong WF, Kamaruzzaman SB, Tan MP

Int J Clin Pract, 2021 Dec;75(12):e14999.

PMID: 34714589 DOI: 10.1111/ijcp.14999

INTRODUCTION: Older persons with diabetes are at an increased risk of falls leading to fractures, head injuries and disability.

OBJECTIVE: To evaluate the potential relationship between falls and diabetes in older persons and identify differences in risk factors of falls among older persons with and without diabetes using the first wave dataset of the Malaysian Elders Longitudinal Research (MELoR) study.

METHODOLOGY: Community dwelling adults aged ≥ 55 years were selected through stratified random sampling from three parliamentary constituencies in greater Kuala Lumpur. Baseline data was obtained through computer-assisted, home-based interviews. The presence of falls was established by enquiring about falls in the preceding 12 months. Diabetes was defined as self-reported, physician-diagnosed diabetes, diabetes medication use and an HbA1c of ≥ 6.3%.

RESULTS: Diabetes was present in 44.4% of the overall 1610 participants. The prevalence for fall among older diabetics was 25.6%. Recurrent falls (odds ratio (OR) 1.65; 95% confidence interval (CI) 1.06-2.57) was more common among diabetics. Following adjustment for potential confounders, osteoporosis (OR 2.58; 95% CI 1.31-5.08) and dizziness (OR 1.50; 95% CI 1.01-2.23) were independent risk factors for falls. Better instrumental activities of daily living scores were protective against falls (OR 0.75; 95% CI 0.58-0.97).

CONCLUSION: The presence of osteoporosis and dizziness was associated with an increased risk of falls among older diabetics. These findings will need to be confirmed in future prospective follow-up of this cohort.

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