Displaying publications 1 - 20 of 126 in total

  1. Ng KP
    Med. J. Malaysia, 1998 Mar;53(1):112-4.
    PMID: 10968150
    An episode of acute upper airway obstruction was caused by a lingual haematoma, when a patient with end stage renal failure suffered a hypocalcaemic fit and bit his tongue. The large haematoma and profuse bleeding caused the patient to obstruct and become hypoxic, and rendered laryngoscopy and intubation impossible, requiring an urgent tracheostomy to secure the airway.
  2. Ng KP
    Med. J. Malaysia, 1997 Sep;52(3):269-73.
    PMID: 10968097
    Fifty-five patients were followed up after day surgery for breast lumpectomy. It was found that local infiltration with bupivacaine significantly decreased analgesic requirement in recovery. Almost half of the patients could not be contacted during the 24 hour post-operative follow-up by telephone. 7.1% complained of severe pain despite oral analgesics. 14.3% of patients had queries regarding wound care and 78.6% of the patients were willing to undergo day surgery again. Ongoing patient education and good post operative analgesia are crucial to enable successful establishment of ambulatory surgery. Post-operative follow-up is encouraged to audit clinical and social outcomes of day surgery.
  3. Chan YK, Ng KP
    Int J Obstet Anesth, 2000 Oct;9(4):225-32.
    PMID: 15321075
    A survey was conducted in several countries in the Far East in an attempt to determine the practice of obstetric analgesia and anaesthesia there. Survey forms were sent to a total of 11 countries but in the end responses from only four countries were able to provide useful information. Responses from Singapore, Hong Kong, Taiwan and Malaysia covered between 44.9% (Singapore) and 24.6% (Malaysia) of their countries' total deliveries in 1997 and were thought to be adequate to give an impression of the obstetric analgesia and anaesthesia services in their respective countries, although this would not necessarily be completely accurate. From our survey, we found that the availability of regional analgesia for labour paralleled the economic status of the country and that a significant number of caesarean sections are conducted under regional anaesthesia, mainly spinals.
  4. NG KP, Wang CY
    Paediatr Anaesth, 1999;9(6):491-4.
    PMID: 10597551 DOI: 10.1046/j.1460-9592.1999.00420.x
    Intubating conditions under halothane anaesthesia aided with alfentanil 20 micrograms.kg-1 were compared with suxamethonium 2 mg.kg-1 in 40 children presenting for day dental procedures. The condition of vocal cords, jaw relaxation and presence of movement and coughing were scored to give the overall intubating conditions. Successful intubation was achieved in 100% of the suxamethonium group and 94.7% of the alfentanil group. The cardiovascular response to intubation was attenuated in the alfentanil group. Some 43.7% of those receiving suxamethonium developed myalgia the day after surgery compared with 0% in the alfentanil group (P < 0.01).
  5. Lee WS, Ng KP
    Singapore Med J, 2001 Mar;42(3):100-1.
    PMID: 11405558
    A pilot study to determine the seroprevalence of anti-HCV among children from Kuala Lumpur, Malaysia, was conducted using microparticle enzyme immunoassay. Serum samples were obtained randomly from children, aged between one to 16 years of age, admitted to the paediatric unit of University of Malaya Medical Centre, Kuala Lumpur for various medical reasons. Of the 179 samples assayed, only one was positive, giving the prevalence rate of 0.6%. It is reasonable to conclude that the seroprevalence of anti-HCV among children from Kuala Lumpur is low, less than 1%.
  6. Chan YK, Ng KP
    J. Obstet. Gynaecol. Res., 2000 Apr;26(2):137-40.
    PMID: 10870307
    A survey covering 30% of the deliveries in Malaysia was done to determine the practice of obstetric anaesthesia and analgesia for 1996.
  7. Ng KP, Saw TL
    Med. J. Malaysia, 1999 Sep;54(3):352-7.
    PMID: 11045062
    Hepatitis B surface antigen can be serologically defined as ayw1, ayw2, ayw3, ayw4, ayr, adw2, adw4 and adrq+ or adrq-. A study of common HBsAg subtypes in 44 HBsAg reactive sera in University Hospital was conducted using a solid-phase sandwich EIA. Eleven samples were found not typable and among the 33 typable HBsAg reactive sera, 3 HBsAg subtypes: adw, adr and ayw were identified. Subtype adw was found in 66.7% (22/33) of the typable HBsAg reactive sera; 24.2% (8/33) was of subtype adr and 6.0% (2/33) of subtype ayw. One sample was found to be reactive to both adw and adr. HBsAg subtype adw was found more commonly in Chinese but among the Malays, HBsAg subtype adr appeared to predominate. However, the small sample size precludes firm conclusions on the predominant subtype among the Malays.
  8. Ng KP, Shekhar KC
    Med. J. Malaysia, 1993 Sep;48(3):293-6.
    PMID: 8183141
    A total of 320 faecal specimens obtained from 295 patients (192 children and 103 adults) with diarrhoea and 47 faecal specimens from healthy adults were screened for Cryptosporidium oocysts. Faecal specimens were first screened by modified Ziehl Neelsen stain and specimens with oocysts were confirmed by direct immunofluorescence technique. Cryptosporidium oocysts were detected in 4 children but not in normal healthy adults or in diarrhoeic adults.
  9. Ng KP, Saw TL
    Med. J. Malaysia, 1994 Jun;49(2):117-21.
    PMID: 8090089
    A total of 250 hepatitis B surface antigen positive sera were screened for antibody to hepatitis B surface antigen. It was found that seven (3%) sera showed concurrently circulating surface antigen and surface antibody to hepatitis B virus. The level of antibody to surface antigen was not affected by HBeAg and most of the cases were found in chronic hepatitis B carriers.
  10. Ng KP, Ngeow YF, Rozainah K, Rosmawati M
    Med. J. Malaysia, 2013 Apr;68(2):144-7.
    PMID: 23629561 MyJurnal
    A nationwide HBV vaccination for neonates in the Expanded Programme on Immunization (EPI) was implemented in Malaysia in 1989. The objective of this study was to investigate the prevalence of HBsAg, anti-HBs and anti-HBc among the new student intakes in the Faculties of Medicine and Dentistry, University of Malaya from 2005 to 2011.
  11. Madhavan P, Jamal F, Chong PP, Ng KP
    Trop Biomed, 2011 Aug;28(2):269-74.
    PMID: 22041745
    The objective of our study was to study the effectiveness of CHROMagar Candida™ as the primary identification method for various clinical Candida isolates, other than the three suggested species by the manufacturer. We studied 34 clinical isolates which were isolated from patients in a local teaching hospital and 7 ATCC strains. These strains were first cultured in Sabouraud dextrose broth (SDB) for 36 hours at 35ºC, then on CHROMagar plates at 30ºC, 35ºC and 37ºC. The sensitivity of this agar to identify Candida albicans, Candida dubliniensis, Candida tropicalis, Candida glabrata, Candida rugosa, Candida krusei and Candida parapsilosis ranged between 25 and 100% at 30ºC, 14% and 100% at 35ºC, 56% and 100% at 37ºC. The specificity of this agar was 100% at 30ºC, between 97% and 100% at 35ºC, 92% and 100% at 37ºC. The efficiency of this agar ranged between 88 and 100% at 30ºC, 83% and 100% at 35ºC, 88% and 100% at 37ºC. Each species also gave rise to a variety of colony colours ranging from pink to green to blue of different colony characteristics. Therefore, the chromogenic agar was found to be useful in our study for identifying clinical Candida isolates.
  12. Madhavan P, Jamal F, Chong PP, Ng KP
    Trop Biomed, 2010 Aug;27(2):200-7.
    PMID: 20962716 MyJurnal
    The in vitro susceptibility of clinical Candida isolates towards fluconazole and voriconazole was determined using the E-test method. A total of 41 clinical isolates recovered from patients since 2004 until 2009 from two local hospitals in Kuala Lumpur, Malaysia were used. These comprised Candida tropicalis, Candida albicans, Candida krusei, Candida parapsilosis, Candida rugosa, Candida dubliniensis and Candida glabrata. Strains from American Type Culture Collection were used as quality control. Lawn cultures of the isolates on RPMI-1640 agar medium supplemented with 2% glucose were incubated with the E-test strips at 35ºC for 48 h. Our results show that 71% were susceptible to fluconazole and 90% were susceptible to voriconazole. All strains of C. krusei were resistant to fluconazole and 50% were susceptible in a dose-dependent manner to voriconazole. There were 66% and 33% of C. glabrata that were resistant to fluconazole and voriconazole. Our study revealed that majority of the clinical Candida isolates was susceptible to fluconazole and voriconazole with a small percentage being resistant to both the drugs.
  13. Fadzilah MN, Ng KP, Ngeow YF
    Malays J Pathol, 2009 Dec;31(2):93-7.
    PMID: 20514851
    A prospective study was conducted on 510 respiratory specimens for the presence of M. tuberculosis detected by direct acid-fast bacilli (AFB) smear examination, culture in the Manual Mycobacteria Growth Indicator Tube (BBL MGIT, Becton-Dickinson) and culture on Lowenstein-Jensen (LJ) medium. From positive BBL MGIT tubes, Ziehl-Neelsen and Gram stains were performed and subcultures were put up on LJ medium. A total of 101 (19.8%) specimens were positive by the BBL MGIT, 60 (11.8%) by primary LJ medium culture, 31 (6.1%) by direct smear examination and 29 (5.7%) by all three methods. Using primary LJ culture as the gold standard, the sensitivity and specificity of the BBL MGIT were 90% and 89.6% respectively but the sensitivity of AFB smear microscopy was only 48.3%. About half (51.1%) of the BBL MGIT false positives were due to contamination by non-AFB bacteria. The remaining false positives comprised specimens that were AFB microscopy positive but LJ culture negative. Of the AFB isolates obtained on LJ primary and sub-cultures, almost all (93.3%) were identified as Mycobacterium tuberculosis complex. The mean time-to-detection was significantly shorter (p < 0.0001) for the BBL MGIT than for LJ culture. For the former, positive results were available within 14 days for both AFB smear-positive and AFB smear-negative specimens. On the average, positive results were obtained 1.8 days earlier for direct AFB smear-positive samples than for AFB smear-negative samples. On the other hand, positive growth on LJ medium appeared after at least 33 days of incubation. These findings suggest that the BBL MGIT system will be a suitable alternative to LJ culture for the routine diagnosis of pulmonary tuberculosis, but a combination of liquid and solid cultures is still required for the highest diagnostic accuracy.
  14. Ng KP, Saw TL, Baki A, Kamarudin R
    Med. J. Malaysia, 2003 Aug;58(3):454-60.
    PMID: 14750391
    Determine HIV-1/2, Chembio HIV-1/2 STAT-PAK and PenTest are simple/rapid tests for the detection of antibodies to HIV-1 and HIV-2 in human whole blood, serum and plasma samples. The assay is one step and the result is read visually within 15 minutes. Using 92 known HIV-1 reactive sera and 108 known HIV-1 negative sera, the 3 HIV tests correctly identified all the known HIV-1 reactive and negative samples. The results indicated that Determine HIV-1/2, Chembio HIV-1/2 STAT-PAK and PenTest HIV are as sensitive and specific (100% concordance) as Microparticle Enzyme Immunoassay. The data indicated that these 3 HIV tests are effective testing systems for diagnosis of HIV infection in a situation when the conventional Enzyme Immunoassay is not suitable.
  15. Rasool S, Siar CH, Ng KP
    J Coll Physicians Surg Pak, 2005 Nov;15(11):679-82.
    PMID: 16300700
    To determine the various oral Candidal species among healthy Malaysian adults.
  16. Tee KK, Kamarulzaman A, Ng KP
    AIDS Res. Hum. Retroviruses, 2006 Feb;22(2):121-4.
    PMID: 16478392
    To assess the prevalence of mutations associated with drug resistance in antiretroviral-naive patients in Kuala Lumpur, Malaysia, genotypic resistance testing was conducted among drug-naive HIV-1 patients attending the University Malaya Medical Center (UMMC) between July 2003 and June 2004. Reverse transcriptase (RT) and protease genes of plasma virions were sequenced from 100 individuals. The majority of the patients were recently diagnosed. Codons 20-255 of the RT and 1-96 of the protease gene were examined for major and minor mutations associated with antiretroviral resistance reported by the International AIDS Society- USA (IAS-USA) Drug Resistance Mutations Group. The prevalence of patients with at least one major mutation conferring drug resistance was 1%, with only one patient having a Y181C amino acid substitution in the RT gene that confers high-level resistance to nevirapine and delavirdine. Minor mutations were detected in high prevalence in the protease gene. Amino acid substitutions I13V, E35D, and M36I were associated with CRF01_AE while L63P, V77I, and I93L were associated with subtype B. Baseline prevalence of major mutations associated with resistance to antiretroviral drugs was low among antiretroviral-naive HIV-1 patients, suggesting that routine drug resistance testing may be unnecessary for all individuals newly diagnosed with HIV or all patients beginning antiretroviral therapy.
  17. Chan YK, Ng KP, Chiu CL
    Int J Obstet Anesth, 2002 Jul;11(3):176-9.
    PMID: 15321544 DOI: 10.1054/ijoa.2002.0954
    Available data for obstetric care in the University Malaya Medical Centre, Kuala Lumpur from 1987 to 1999 were reviewed. Despite incomplete data, we were able to determine fairly well the practice of obstetric anaesthesia and analgesia in the unit, and the changes over the years. There was a decline in the use of general anaesthesia for both elective and emergency caesarean sections from 41.3% and 69.4% respectively in 1995 to 21.6% and 26.9% respectively in 1999. By 1999, regional anaesthesia had become the most common method of anaesthesia administered in both elective (14.3% epidural and 63.5% spinal) and emergency (30.2% epidural and 42.6% spinal) caesarean sections. The percentage of patients delivering vaginally who received epidural analgesia appeared to have stabilised at about 8 to 9% in the last few years, with a gradual decline in the total instrumental delivery rate from a high of about 12% to the pre-epidural rate of 7%.
  18. Tee KK, Kamarulzaman A, Ng KP
    Med. Microbiol. Immunol., 2006 Jun;195(2):107-12.
    PMID: 16404607
    To assess the prevalence of major drug resistance mutations in antiretroviral (ARV)-treated patients with detectable viral load (VL) in Kuala Lumpur, Malaysia, genotypic resistance testing was performed among treated human immunodeficiency virus type 1 (HIV-1) patients attending the University Malaya Medical Center between July 2003 and November 2004. The reverse transcriptase (RT) and protease genes from 36 plasma samples with detectable VL were examined for major mutations associated with ARV resistance as reported by the International AIDS Society-USA Drug Resistance Mutations Group. The prevalence of patients with at least one major mutation conferring drug resistance to nucleoside RT inhibitors (NRTIs), non-NRTIs (NNRTIs) or protease inhibitors (PIs) was 77.8%. In the RT gene, the frequency of mutations associated with NRTIs and NNRTIs resistance was 52.8 and 63.9%, respectively, with M184V and K103N mutations being selected most frequently by these drugs. A patient with Q151M mutation complex was also detected. Twenty-two percent of the patients had mutations associated with PIs. The following pattern of prevalence of ARV-resistant HIV-1 variants was observed: NNRTI-resistant > NRTI-resistant > PI-resistant. The prevalence of major drug resistance mutations among ARV-treated patients with detectable VL is high in Kuala Lumpur. Genotypic drug resistance testing is therefore important for monitoring patients experiencing ARV regimen failure.
  19. Saraswathy TS, Ng KP, Sinniah M
    PMID: 11127327
    The HIV-1 genetic variation in 60 infected Malaysian intravenous drug users (IDU) was studied by comparison of the nucleotide sequences and their predicted amino acid sequences in the V3 loop of the external glycoprotein gp120. In this study, HIV-1 B, C and E subtypes were identified among Malaysian IDU, with HIV-1 B being the predominant subtype (91.7%). HIV-1 C and HIV-1 E were minority subtypes among Malaysian IDU. Analysis of the amino acid alignment of the C2-V3 region of the env gene suggests a genetic relationship between Thai and Malaysian B and E subtype strains. This study serves as a baseline for monitoring HIV-1 genetic diversity and spread in Malaysia.
  20. Ng KP, Saw TL, Madasamy M, Soo Hoo T
    Mycopathologia, 1999;147(1):29-32.
    PMID: 10872513
    The common etiological agents of onychomycosis are dermatophytes, molds and yeasts. A mycological nail investigation of onychomycosis using direct microscopy and culture was conducted by the Mycology Unit, Department of Medical Microbiology, University of Malaya from March 1996 to November 1998. The study involved 878 nail clippings or subungal scrapings from subjects with onychomycosis. On direct microscopy examination, 50% of the specimens were negative for fungal elements. On culture, 373 specimens had no growth; bacteria were isolated from 15 nail specimens. Among the 490 specimens with positive fungal cultures, 177 (36.1%) were dermatophytes, 173 (35.5%) were molds and 130 (26.5%) were Candida. There were 2% (10/490) mixed infections of molds, yeasts and dermatophytes. Trichophyton rubrum (115/177) and Trichophyton mentagrophytes (59/177) were the main dermatophytes isolated. The molds isolated were predominantly Aspergillus niger (61/173), Aspergillus nidulans (30/173), Hendersonula toruloidea (26/173) and Fusarium species (16/173). 96.9% of the Candida species identified were Candida albicans.
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