Browse publications by year: 2001

  1. Chan SP, Hew FL, Jayaram G, Kumar G, Chang KW, Tay A
    Ann Acad Med Singap, 2001 Jan;30(1):66-70.
    PMID: 11242630
    INTRODUCTION: Although the majority of patients with primary hyperparathyroidism have a relatively asymptomatic benign disorder, there are patients who have a more aggressive disorder.

    CLINICAL PICTURE: We report a case of primary hyperparathyroidism presenting during pregnancy complicated by antepartum haemorrhage and severe prematurity. The diagnosis was made postpartum, when her problems rapidly progressed to result in severe neuromuscular weakness, bilateral pathological hip fractures as well as nephrolithiasis.

    TREATMENT: Surgical parathyroidectomy was performed. The underlying lesion was a large solitary parathyroid adenoma with cystic elements.

    CONCLUSION: Primary hyperparathyroidism is not an innocuous disease and can result in severe morbidity if left untreated.

    MeSH terms: Adenoma/complications; Adenoma/diagnosis*; Adenoma/surgery; Adult; Female; Follow-Up Studies; Fractures, Spontaneous/etiology*; Hip Fractures/etiology*; Humans; Hyperparathyroidism/etiology*; Kidney Calculi/etiology*; Parathyroid Neoplasms/complications; Parathyroid Neoplasms/diagnosis*; Parathyroid Neoplasms/surgery; Pregnancy; Pregnancy Complications/etiology*; Severity of Illness Index; Parathyroidectomy; Risk Assessment
  2. Chua KB, Lam SK, Goh KJ, Hooi PS, Ksiazek TG, Kamarulzaman A, et al.
    J Infect, 2001 Jan;42(1):40-3.
    PMID: 11243752
    To study the excretion of Nipah virus in the upper respiratory secretions and urine of infected patients in relation to other clinical features.
    MeSH terms: Adolescent; Adult; Animals; Ascites; Disease Outbreaks; Female; Humans; Immunoglobulin G; Malaysia/epidemiology; Male; Middle Aged; Nasal Mucosa/virology; Pharynx/virology; Prognosis; Respiratory System/secretion; Respiratory System/virology*; Virus Shedding; Paramyxovirinae/isolation & purification*; Paramyxoviridae Infections/epidemiology; Paramyxoviridae Infections/urine; Paramyxoviridae Infections/virology*; Encephalitis, Viral/epidemiology; Encephalitis, Viral/urine; Encephalitis, Viral/virology*; Fluorescent Antibody Technique, Indirect; Mice
  3. Lim KH, Lim YC, Liam CK, Wong CM
    Chest, 2001 Mar;119(3):955-7.
    PMID: 11243981
    MeSH terms: Bronchial Fistula/complications; Bronchial Fistula/congenital*; Esophageal Fistula/complications; Esophageal Fistula/congenital*; Female; Hemoptysis/etiology*; Humans; Middle Aged; Recurrence
  4. Goh KL, Parasakthi N
    Eur J Gastroenterol Hepatol, 2001 Feb;13(2):177-83.
    PMID: 11246618
    BACKGROUND: Malaysia is a multiracial country where three major Asian races live together: Malay, Chinese and Indian. In addition, there are a number of native or indigenous races, particularly in East Malaysia. Differences in prevalence of gastric diseases between races have been noted, particularly with respect to peptic ulcer disease and gastric cancer. The aim of this study is to determine the prevalence rates and risk factors for Helicobacter pylori infection among various races in Malaysia.

    METHODS: A large-scale prospective seroepidemiological study in West and East Malaysia using the HEL-p II commercial enzyme-linked immunosorbent assay kit (AMRAD, Melbourne, Australia) to detect H. pylori antibodies. Populations surveyed in West Malaysia were a rural community from Kuala Pilah, and blood donors from Kuala Lumpur and Kota Baru. Subjects studied in East Malaysia were volunteer blood donors from Kota Kinabalu, and blood donors and healthy volunteers from Sibu. Statistical analyses using multiple logistic regression analysis were carried out to identify independent risk factors for H. pylori infection

    RESULTS: A total of 2,381 subjects were evaluated. H. pylori prevalence varied from different areas of study and ranged from a low of 26.4% in blood donors from Kota Baru to a high of 55.0% in Kota Kinabalu. The most striking differences, however, were noted in the prevalence rates among different racial groups. Prevalence rates among the Malays ranged from 11.9 to 29.2%, while the Chinese ranged from 26.7 to 57.5%, and those of Indians in two studies were 49.4 and 52.3%. In every location, Malays had a significantly lower prevalence compared with the other races. The highest prevalence rates were recorded among the indigenous races in Kota Kinabalu, East Malaysia. There was no difference between males and females in the studies. An increasing trend with age was noted in the majority of studies; however, no increase in prevalence rates was noted among the Malays.

    CONCLUSIONS: The pattern of infection in a multiracial population in Malaysia points to a 'racial cohort' phenomenon. The infection appears to be confined to a racial group, with the Malays having consistently low prevalence rates. This observation may provide clues to the mode of transmission of infection.

    MeSH terms: Adolescent; Adult; Aged; Child; Female; Humans; Malaysia/epidemiology; Male; Middle Aged; Prospective Studies; Risk Factors; Logistic Models; Seroepidemiologic Studies; Helicobacter pylori*; Helicobacter Infections/ethnology; Helicobacter Infections/epidemiology*; European Continental Ancestry Group; Asian Continental Ancestry Group
  5. Bhattacharya-Chatterjee M, Chatterjee SK, Foon KA
    Curr. Opin. Mol. Ther., 2001 Feb;3(1):63-9.
    PMID: 11249733
    Certain anti-idiotypic antibodies that bind to the antigen-combining sites of antibodies can effectively mimic the three-dimensional structures and functions of the external antigens and can be used as surrogate antigens for active specific immunotherapy. Extensive studies in animal models have demonstrated the efficacy of these vaccines for triggering the immune system to induce specific and protective immunity against bacterial, viral and parasitic infections as well as tumors. Several monoclonal anti-idiotype antibodies that mimic distinct human tumor-associated antigens have been developed and characterized. Encouraging results have been obtained in recent clinical trials using these anti-idiotype antibodies as vaccines. In this article, we will review the current literature and discuss the potential of this novel therapeutic approach for various human cancers.
    MeSH terms: Animals; Antibodies, Anti-Idiotypic/therapeutic use*; Antibodies, Monoclonal/therapeutic use; Breast Neoplasms/therapy; Clinical Trials as Topic; Female; Humans; Immunotherapy/methods*; Lung Neoplasms/therapy; Melanoma/therapy; Neoplasms/immunology; Neoplasms/therapy*; Colorectal Neoplasms/therapy; Carcinoma, Small Cell/therapy; Cancer Vaccines/therapeutic use
  6. Ng SW, Chantrapromma S, Razak IA, Fun HK
    Acta Crystallogr C, 2001 Mar;57(Pt 3):291-2.
    PMID: 11250582
    The triclinic cell of the title compound contains 2C(12)H(24)N(+) x 2C(6)H(5)O(2)S(-) ion pairs that are linked by four hydrogen bonds [N...O = 2.728 (3) and 2.758 (3) A] across a centre of inversion.
    MeSH terms: Hydrogen; Hydrogen Bonding; Chromosome Inversion; Molecular Structure
  7. Menon BS, Maziah W, Samarendra M, Toha A
    Arch Pediatr Adolesc Med, 2001 Mar;155(3):411-2.
    PMID: 11231812
    MeSH terms: Antineoplastic Combined Chemotherapy Protocols/therapeutic use; Child; Female; Humans; Tomography, X-Ray Computed; Lymphoma, Large B-Cell, Diffuse/classification; Lymphoma, Large B-Cell, Diffuse/diagnosis*; Lymphoma, Large B-Cell, Diffuse/drug therapy; Muscle Neoplasms/classification; Muscle Neoplasms/diagnosis*; Muscle Neoplasms/drug therapy
  8. Knebel U, Sloot N, Eikenberg M, Borsdorf H, Höffler U, Riemann JF
    Med. Klin. (Munich), 2001 Feb 15;96(2):109-13.
    PMID: 11253281
    BACKGROUND: Plesiomonas shigelloides is a common pathogen in tropical regions, whereas it is rarely isolated in temperate climates. It is most often found in surface water and fish. During the last 10 years it was found to cause gastroenteritis 6 times in Ludwigshafen. Not all of these patients reported a trip to foreign countries.

    CASE REPORT: A 54-year-old male patient was hospitalized after a trip to Malaysia with strong greenish watery diarrhea and chills. On physical examination we saw a dehydrated patient in severely reduced general condition. The stool frequency was 30/d. The laboratory examinations only showed elevated parameters of inflammation. Plesiomonas shigelloides was cultivated in the stool cultures. With appropriate substitution of fluid and electrolytes, and antidiarrheal therapy the patient resumed a normal diet without any complications. Three days later his bowel movements were normal and his general condition was greatly improved. We withheld antibiotic therapy because of the noncomplicated course of illness.

    CONCLUSION: In Germany infections with Plesiomonas shigelloides are rare, an increase is observed because of increasing tourism to tropical regions. The course of infection is sometimes asymptomatic, but usually patients develop an acute gastroenteritis. Especially immunocompromised patients can show serious courses of infection. Plesiomonas shigelloides should be included in the differential diagnosis of acute gastroenteritis after journeys to tropical regions. Some of our patients, however, denied traveling to tropical regions. They also denied consuming seafood, which indicates a risk of infection in Germany. Still an infection with Plesiomonas shigelloides seems to be rare in northern European countries.

    MeSH terms: Diarrhea/microbiology*; Europe/epidemiology; Gastroenteritis/microbiology*; Humans; Malaysia/epidemiology; Male; Middle Aged; Travel; Gram-Negative Bacterial Infections/microbiology*; Gram-Negative Bacterial Infections/epidemiology; Gram-Negative Bacterial Infections/therapy; Plesiomonas/isolation & purification*
  9. Low KS, Lee CK, Lee CY
    Appl Biochem Biotechnol, 2001 Jan;90(1):75-87.
    PMID: 11257809
    The potential of quaternized wood (QW) chips in removing hexavalent chromium from synthetic solution and chrome waste under both batch and continuous-flow conditions was investigated. Sorption was found to be dependent on pH, metal concentration, and temperature. QW chips provide higher sorption capacity and wider pH range compared with untreated wood chips. The equilibrium data could be fitted into the Langmuir isotherm model, and maximum sorption capacities were calculated to be 27.03 and 25.77 mg/g in synthetic chromate solution and chrome waste, respectively. The presence of sulfate in high concentration appeared to suppress the uptake of chromium by QW chips. Column studies showed that bed depth influenced the breakthrough time greatly whereas flow rate of influent had little effect on its sorption on the column.
    MeSH terms: Adsorption; Anions/metabolism; Carcinogens, Environmental/metabolism; Chromatography; Chromium/metabolism*; Costs and Cost Analysis; Hazardous Waste*; Hydrogen-Ion Concentration; Industrial Waste*; Temperature; Thermodynamics; Time Factors; Wood*
  10. Biswal BM, Kareem A, Ahmed NM
    Australas Radiol, 2001 Feb;45(1):71-3.
    PMID: 11259979 DOI: 10.1046/j.1440-1673.2001.00883.x
    A patient with nasopharyngeal carcinoma developed clubbing and hypertrophic osteoarthropathy 6 months before radiological detection of secondary deposits in the lung. Another patient with nasopharyngeal carcinoma developed digital clubbing and hypertrophic osteoarthropathy 6 months after the discovery of lung metastases. Development of a paraneoplastic syndrome in the form of hypertrophic osteoarthropathy and digital clubbing is very rare. This manifestation of nasopharyngeal cancers is presented, with a short review of its biology and pathogenesis.
    MeSH terms: Adult; Combined Modality Therapy; Humans; Lung Neoplasms/secondary; Male; Nasopharyngeal Neoplasms/complications*; Nasopharyngeal Neoplasms/diagnosis; Nasopharyngeal Neoplasms/therapy; Osteoarthropathy, Secondary Hypertrophic/diagnosis*; Osteoarthropathy, Secondary Hypertrophic/drug therapy; Osteoarthropathy, Secondary Hypertrophic/etiology*
  11. Gething M
    J Small Anim Pract, 2001 Feb;42(2):100-1.
    PMID: 11263696
    MeSH terms: Animals; Hong Kong; India; International Cooperation*; Malaysia; Surgery, Veterinary; Taiwan; Thailand; Veterinary Medicine*; Croatia
  12. Fadilah SA, Raymond AA, Cheong SK
    Postgrad Med J, 2001 Apr;77(906):268-269; discussion 277-8.
    PMID: 11264499
    MeSH terms: Aged; Diagnosis, Differential; Humans; Male; Paraneoplastic Syndromes/diagnosis; Paraneoplastic Syndromes/etiology*; Prostatic Neoplasms*; Tremor/etiology*; Bone Marrow Neoplasms/complications; Bone Marrow Neoplasms/secondary*
  13. Ho KH, Ong BK
    Headache, 2001 Mar;41(3):279-84.
    PMID: 11264688 DOI: 10.1046/j.1526-4610.2001.111006279.x
    This study presents the first account of the racial differences in headache prevalence and characteristics in the Singapore population. A questionnaire was administered to 2096 individuals from a randomized sample of 1400 households to test the hypothesis that race was independently correlated with headache diagnosis and morbidity. The overall lifetime prevalence of headaches in the study population was 82.7%; this did not vary between racial groups. The modal age of headache onset in all races was in the second decade and was similar in all races. Multivariate analysis showed that headache morbidity was independent of age, sex, income level, marital status, shift duties, and educational level, and correlated only with race and a positive family history of severe headache. Non-Chinese were more likely to suffer from severe headaches than Chinese, were more likely to seek medical attention, and were more likely to require medical leave for their symptoms. Non-Chinese had more migrainous headaches than Chinese, although characteristics of headache both groups experienced that were unrelated to severity differed only in a few aspects. We conclude that racial factors account for differences in headache classification, perception of headache severity and health-seeking behavior.
    MeSH terms: Adolescent; Adult; Aged; China/ethnology; Female; Headache/ethnology*; Headache/etiology; Headache/genetics*; Headache/therapy; Health Surveys; Humans; India/ethnology; Malaysia/ethnology; Male; Middle Aged; Random Allocation; Singapore/epidemiology; Health Behavior; Prevalence; Asian Continental Ancestry Group/genetics*
  14. Aris IB, Wagie AA, Mariun NB, Jammal AB
    J Telemed Telecare, 2001;7(1):51-3.
    PMID: 11265939
    We developed a personal blood pressure monitoring system for patients with hypertension or hypotension. The system can be used to measure a patient's blood pressure at home and to transmit the data automatically to a hospital database via the Internet. The accuracy of blood pressure readings using the system was assessed by comparison with readings from a standard digital sphygmomanometer in four subjects. The measurement error for the systolic readings was 1.7-2.7% and for the diastolic readings 2.7-3.2%. The system therefore appears to be a promising means of assessing blood pressure remotely.
    MeSH terms: Adult; Blood Pressure/physiology; Blood Pressure Determination/methods*; Humans; Hypertension/physiopathology; Hypertension/therapy*; Hypotension/physiopathology; Hypotension/therapy*; Telemedicine*; Internet*
  15. Wan Nazaimoon WM, Siaw FS, Sheriff IH, Faridah I, Khalid BA
    Ann. Clin. Biochem., 2001 Jan;38(Pt 1):57-8.
    PMID: 11270843
    MeSH terms: Creatine Kinase/blood*; Diagnosis, Differential; Euthyroid Sick Syndromes/diagnosis; Euthyroid Sick Syndromes/enzymology; Humans; Hyperthyroidism/diagnosis; Hyperthyroidism/enzymology*; Hypothyroidism/diagnosis; Hypothyroidism/enzymology; Thyrotoxicosis/diagnosis*; Thyrotoxicosis/enzymology*; Biomarkers/blood
  16. Chong SA, Remington G, Mahendran R, Chua HC
    J Clin Psychopharmacol, 2001 Apr;21(2):235-7.
    PMID: 11270922
    While ethnocultural differences in risk of tardive dyskinesia (TD) have been suggested, no previous studies have examined whether this factor also plays a role in lack of awareness of TD. This study examined this question in an Asian population with schizophrenia. Six hundred seven patients in a state mental hospital in Singapore were assessed using the Abnormal Involuntary Movement Scale (AIMS) and the Simpson-Angus Rating Scale. Of the 607 patients, 242 (39.9%) met criteria for TD, and 163 (67.4%) patients were not aware of the presence of TD. No significant differences in terms of age, gender, and duration of illness were found between those aware of their TD and those not aware. Daily neuroleptic doses and scores for the AIMS and Simpson-Angus Rating Scale were significantly different, although after logistic regression, only the Simpson-Angus Rating Scale scores remained significant. The finding that a large proportion of our patients lacked awareness of their TD is consistent with other reports in the West and provides evidence that this feature is characteristic of the illness rather than of a specific ethnocultural group. We found an association between lack of awareness and greater severity of extrapyramidal symptoms (EPS), suggesting that there may be a subtype of TD in which lack of awareness and greater vulnerability of developing EPS are features.
    MeSH terms: Adult; Aged; China/ethnology; Dyskinesia, Drug-Induced/ethnology*; Female; Humans; India/ethnology; Malaysia/ethnology; Male; Middle Aged; Schizophrenia/drug therapy; Schizophrenia/ethnology*; Chi-Square Distribution; Logistic Models
  17. Yuen KH, Choy WP, Tan HY, Wong JW, Yap SP
    J Pharm Biomed Anal, 2001 Feb;24(4):715-9.
    PMID: 11272330
    A simple high-performance liquid chromatographic method was developed for the determination of omeprazole in human plasma. Omeprazole and the internal standard, chloramphenicol, were extracted from alkalinized plasma samples using dichloromethane. The mobile phase was 0.05 M Na2HPO4-ACN (65:35, v/v) adjusted to pH 6.5. Analysis was run at a flow rate of 1.0 ml/min at a detection wavelength of 302 nm. The method was specific and sensitive with a detection limit of 2.5 ng/ml at a signal-to-noise ratio of 4:1. The limit of quantification was set at 5 ng/ml. The calibration curve was linear over a concentration range of 5-1280 ng/ml. Mean recovery value of the extraction procedure was about 96%, while the within and between day coefficient of variation and percent error values of the assay method were all less than 14%.
    MeSH terms: Chloramphenicol/blood; Chromatography, High Pressure Liquid/methods*; Humans; Omeprazole/blood*; Sensitivity and Specificity
  18. Kilbourn AM, Godfrey HP, Cook RA, Calle PP, Bosi EJ, Bentley-Hibbert SI, et al.
    J. Wildl. Dis., 2001 Jan;37(1):65-71.
    PMID: 11272506
    Diagnosis of active mycobacterial disease in orangutans (Pongo pygmaeus) has been impeded by high levels of non-specific intradermal skin test reactivity to mycobacterial antigens. This may be due in part to cross reactivity between antigens, tuberculin concentrations used or other species-specific factors. Antigen 85 (Ag85) complex proteins are major secretory products of actively growing mycobacteria, and measurement of serum Ag85 could provide a method for determining active mycobacterial infections that was not dependent on host immunity. Serum Ag85 was measured by dot-immunobinding assay using monoclonal anti-Ag85, purified Ag85 standard and enhanced chemiluminescence technology in coded serum samples from 14 captive orangutans from a zoo in Colorado, 15 semi-captive orangutans in Malaysia, and 19 free-ranging wild orangutans in Malaysia. Orangutans from Colorado (USA) were culture negative for Mycobacterium tuberculosis and M. avium, although all had laboratory suspicion or evidence of mycobacterial infection; median serum Ag85 was 10 microU/ml (range, <0.25-630 microU/ml). Of the semi-captive orangutans, six were skin test reactive and two were culture positive for M. avium on necropsy. Median serum Ag85 for this group was 1,880 microU/ml (0.75-7,000 microU/ml), significantly higher than that of Colorado zoo or free-ranging Malaysian orangutans. Median serum Ag85 in the latter group was 125 microU/ml (range, 0.75-2,500 microU/ml). These data suggest that suggest that additional studies using more specific reagents and more samples from animals of known status are appropriate.
    MeSH terms: Animals; Animals, Wild; Animals, Zoo; Antigens, Bacterial/analysis*; Colorado; Immunoassay/methods; Immunoassay/veterinary; Luminescent Measurements; Malaysia; Mycobacterium avium/isolation & purification; Mycobacterium bovis/immunology*; Mycobacterium bovis/isolation & purification; Pongo pygmaeus; Skin Tests/veterinary; Tuberculosis/diagnosis*; Tuberculosis/immunology; Primate Diseases/immunology*
  19. Goh AY, Lum LC, Abdel-Latif ME
    Lancet, 2001 Feb 10;357(9254):445-6.
    PMID: 11273070
    The 24 h availability of intensive care consultants (intensivists) has been shown to improve outcomes in adult intensive care units (ICU) in the UK. We tested whether such availability would improve standardised mortality ratios when compared to out-of-hours cover by general paediatricians in the paediatric ICU setting of a medium-income developing country. The standardised mortality ratio (SMR) improved significantly from 1.57 (95%CI 1.25-1.95) with non-specialist care to 0.88 (95%CI 0.63-1.19) with intensivist care (rate ratio 0.56, 95% CI 0.47-0.67). Mortality odds ratio decreased by 0.234, 0.246 and 0.266 in the low, moderate and high-risk patients. 24 h availability of intensivists was associated with improved outcomes and use of resources in paediatric intensive care in a developing country.
    MeSH terms: Adult; Child; Child, Preschool; Developing Countries; Diagnosis-Related Groups/statistics & numerical data*; Female; Humans; Infant; Malaysia; Male; Medical Staff, Hospital/supply & distribution*; Pediatrics/manpower*; Personnel Staffing and Scheduling/statistics & numerical data*; Intensive Care Units, Pediatric/manpower*; Survival Analysis; Critical Illness/mortality*
  20. Agatonovic-Kustrin S, Beresford R, Yusof AP
    J Pharm Biomed Anal, 2001 May;25(2):227-37.
    PMID: 11275432
    A quantitative structure-human intestinal absorption relationship was developed using artificial neural network (ANN) modeling. A set of 86 drug compounds and their experimentally-derived intestinal absorption values used in this study was gathered from the literature and a total of 57 global molecular descriptors, including constitutional, topological, chemical, geometrical and quantum chemical descriptors, calculated for each compound. A supervised network with radial basis transfer function was used to correlate calculated molecular descriptors with experimentally-derived measures of human intestinal absorption. A genetic algorithm was then used to select important molecular descriptors. Intestinal absorption values (IA%) were used as the ANN's output and calculated molecular descriptors as the inputs. The best genetic neural network (GNN) model with 15 input descriptors was chosen, and the significance of the selected descriptors for intestinal absorption examined. Results obtained with the model that was developed indicate that lipophilicity, conformational stability and inter-molecular interactions (polarity, and hydrogen bonding) have the largest impact on intestinal absorption.
    MeSH terms: Artificial Intelligence; Chemistry, Physical; Pharmaceutical Preparations/metabolism; Humans; Intestinal Absorption/physiology*; Models, Biological; Neural Networks (Computer); Quantitative Structure-Activity Relationship; Chemical Phenomena
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