Displaying publications 81 - 100 of 110 in total

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  1. Tan PC, Tan NC, Omar SZ
    Clin Chem Lab Med, 2009;47(2):165-71.
    PMID: 19191722 DOI: 10.1515/CCLM.2009.041
    Serum human chorionic gonadotropin (hCG) and estradiol levels are higher in women with hyperemesis gravidarum (HG) than in unaffected pregnant controls. We postulated that higher levels of these hormones may be associated with clinically more severe HG. The aim of this study was to evaluate the effect of maternal hCG and estradiol levels on the severity of HG.
  2. Tan PC, Aziz AZ, Ismail IS, Omar SZ
    Clin Biochem, 2012 Oct;45(15):1192-6.
    PMID: 22659058 DOI: 10.1016/j.clinbiochem.2012.05.025
    OBJECTIVES: To evaluate gamma-glutamyltransferase (GGT), alanine transaminases (ALT) and aspartate transaminases (AST) levels and prevalent gestational diabetes mellitus (GDM).
    DESIGN AND METHODS: Random plasma glucose, GGT, ALT and AST and the 50-g glucose challenge test were done on antenatal women followed by diagnostic 3-point 75-g oral glucose tolerance test within two weeks. GDM was diagnosed by ADA (2011) criteria.
    RESULTS: The GDM rate was 12.2% (319/2610). Mean GGT level was higher in GDM women, 18 ± 12 vs. 16 ± 11 IU/L; P=0.03. The risk for GDM was higher for women in the highest GGT quartile band compared to the lowest: RR 1.35 95%CI 1.0-1.8; P=0.04. However, after adjustment for confounders, GGT was no longer associated with GDM. There was no correlation between ALT and AST levels and GDM.
    CONCLUSIONS: Liver transaminases do not predict GDM in contrast to type 2 diabetes.
  3. Tan PC, Chai JN, Ling LP, Omar SZ
    Clin Exp Obstet Gynecol, 2011;38(2):150-4.
    PMID: 21793277
    OBJECTIVE: To evaluate maternal hemoglobin levels and red cell indices as predictive factors for gestational diabetes (GDM).

    METHOD: Data from 1,538 women were analyzed. At the first visit for prenatal care, the 50-gram glucose challenge test was followed by the 75-gram glucose tolerance test in those who screened positive. GDM was diagnosed based on the WHO (1999) criteria. Maternal complete blood count was obtained at the first visit, hospitalization for birth, and after birth. Receiver operator characteristic curves were generated to establish thresholds. Multivariable logistic regression analyses were performed to establish independent predictors of GDM.

    RESULTS: GDM was diagnosed in 182/1,538 (11.8%). GDM was associated with hemoglobin level, hematocrit and erythrocyte count at the first visit for prenatal care only. Hemoglobin threshold at the first visit was established at 11.5 g/dl. After adjustment, high hemoglobin [AOR 1.5 (95% CI 1.0-2.1); p = 0.027] remained predictive of GDM.

    CONCLUSIONS: High maternal hemoglobin level at the first prenatal visit is independently predictive of GDM.

  4. Subramaniam R, Vijayananthan A, Omar S, Nawawi O, Abdullah B
    Biomed Imaging Interv J, 2010 Jul-Sep;6(3):e27.
    PMID: 21611045 MyJurnal DOI: 10.2349/biij.6.3.e27
    Transcatheter uterine artery embolisation (UAE) for the treatment of symptomatic fibroids has been performed in several centres in the United States, Western Europe and Asia with promising results. This study reports the authors' experience with UAE at the University Malaya Medical Centre.
  5. Mohamed E, Jayapalan JJ, Abdul-Rahman PS, Omar SZ, Hashim OH
    Biomark Res, 2013;1(1):19.
    PMID: 24252421 DOI: 10.1186/2050-7771-1-19
    Accumulated data from previous studies appear to suggest a link between the overexpression of a 35 kDa fragment of serum inter-alpha-trypsin inhibitor H4 (ITIH4) with cancers that are associated with up-regulated levels of oestrogens. The truncated fragment was postulated to be a product of oestrogen-induced action of kallikrein on native ITIH4. The present lectin-based proteomic analyses were performed to assess the specificity of the 35 kDa fragment of ITIH4 as a potential cancer biomarker and determine whether it was also overexpressed in the sera of cancer-negative pregnant women who are known to have high levels of plasma oestrogens.
  6. Choi JR, Pingguan-Murphy B, Wan Abas WA, Noor Azmi MA, Omar SZ, Chua KH, et al.
    Biochem Biophys Res Commun, 2014 May 30;448(2):218-24.
    PMID: 24785372 DOI: 10.1016/j.bbrc.2014.04.096
    Adipose-derived stem cells (ASCs) have been found adapted to a specific niche with low oxygen tension (hypoxia) in the body. As an important component of this niche, oxygen tension has been known to play a critical role in the maintenance of stem cell characteristics. However, the effect of O2 tension on their functional properties has not been well determined. In this study, we investigated the effects of O2 tension on ASCs stemness, differentiation and proliferation ability. Human ASCs were cultured under normoxia (21% O2) and hypoxia (2% O2). We found that hypoxia increased ASC stemness marker expression and proliferation rate without altering their morphology and surface markers. Low oxygen tension further enhances the chondrogenic differentiation ability, but reduces both adipogenic and osteogenic differentiation potential. These results might be correlated with the increased expression of HIF-1α under hypoxia. Taken together, we suggest that growing ASCs under 2% O2 tension may be important in expanding ASCs effectively while maintaining their functional properties for clinical therapy, particularly for the treatment of cartilage defects.
  7. Woo YL, Omar SZ
    Best Pract Res Clin Obstet Gynaecol, 2011 Oct;25(5):597-603.
    PMID: 21684811 DOI: 10.1016/j.bpobgyn.2011.05.004
    Human papillomavirus has been established as the causal agent for cervical cancer. The identification of a clear cause presents an unparalleled opportunity for cancer control. As such, the development of prophylactic human papillomavirus vaccines has been rightly hailed as one of the significant scientific triumphs of the past 20 years. This story of scientific triumph over disease, however, is not yet complete. The fruit of scientific labour must be delivered to the people in order to fulfil the underlying intent of the research (i.e. to prevent cancer and save lives). The success of a vaccination programme, however, does not depend on the biological efficacy of the vaccine alone. Various other local factors, such as poverty, gender inequality, cultural traditions, or religious beliefs, can significantly constrain the success of any vaccination programme. In this chapter, we provide an overview of how the human papillomavirus vaccine works and its global uptake, as well as, how variations in local contexts can affect the successful implementation of a vaccination programme. Other factors besides vaccine costs also need serious attention. With better understanding of such factors, policy makers and medical health professionals will be better equipped to make informed decisions to maximise the potential benefits of the human papillomavirus vaccines for the most number of people in individual countries.
  8. Tan GN, Tan PC, Hong JGS, Kartik B, Omar SZ
    BMJ Open, 2021 05 13;11(5):e046528.
    PMID: 33986063 DOI: 10.1136/bmjopen-2020-046528
    OBJECTIVE: To evaluate four foods in women with hyperemesis gravidarum (HG) on their agreeability and tolerability.

    DESIGN: Prospective, randomised, within-subject cross-over trial.

    SETTING: Single-centre, tertiary, university hospital in Malaysia.

    PARTICIPANTS: 72 women within 24-hour of first admission for HG who were 18 years or above, with confirmed clinical pregnancy of less than 16 weeks' gestation were recruited and analysed. Women unable to consume food due to extreme symptoms, known taste or swallowing disorder were excluded.

    INTERVENTIONS: Each participant chewed and swallowed a small piece of apple, watermelon, cream cracker and white bread in random order and was observed for 10 min after each tasting followed by a 2 min washout for mouth rinsing and data collection.

    OUTCOME MEASURES: Primary outcome was food agreeability scored after 10 min using an 11-point 0-10 Visual Numerical Rating Scale (VNRS). Nausea was scored at baseline (prior to tasting) and 2 and 10 min using an 11-point VNRS. Intolerant responses of gagging, heaving and vomiting were recorded.

    RESULTS: On agreeability scoring, apple (mean±SD 7.2±2.4) ranked highest followed by watermelon (7.0±2.7) and crackers (6.5±2.6), with white bread ranked lowest (6.0±2.7); Kruskal-Wallis H test, p=0.019. Apple had the lowest mean nausea score and mean rank score, while white bread had the highest at both 2 and 10 min; the Kruskal-Wallis H test showed a significant difference only at 10 min (p=0.019) but not at 2 min (p=0.29) in the ranking analyses. The intolerant (gagged, heaved or vomited) response rates within the 10 min study period were apple 3/72 (4%), watermelon 7/72 (10%), crackers 8/72 (11%) and white bread 12/72 (17%): χ2 test for trend p=0.02.

    CONCLUSION: Sweet apple had the highest agreeability score, the lowest nausea severity and intolerance-emesis response rate when tasted by women with HG. White bread consistently performed worst.

  9. Chia HM, Tan PC, Tan SP, Hamdan M, Omar SZ
    BMC Pregnancy Childbirth, 2020 May 29;20(1):330.
    PMID: 32471369 DOI: 10.1186/s12884-020-03029-0
    BACKGROUND: Induction of labor (IoL) is an increasingly common obstetric procedure. Foley catheter IoL is recommended by WHO. It is associated with the lowest rate of uterine hyperstimulation syndrome and similar duration to delivery and vaginal delivery rate compared to other methods. Insertion is typically via speculum but digital insertion has been reported to be faster, better tolerated and with similar universal insertion success compared to speculum insertion in a mixed population of nulliparas and multiparas. Transcervical procedure is more challenging in nulliparas and when the cervix is unripe. We evaluated the ease and tolerability of digital compared to speculum insertion of Foley catheter for induction of labor in nulliparas with unripe cervixes.

    METHODS: A randomized trial was performed in a university hospital in Malaysia. Participants were nulliparas at term with unripe cervixes (Bishop Score ≤ 5) admitted for IoL who were randomized to digital or speculum-aided transcervical Foley catheter insertion in lithotomy position. Primary outcomes were insertion duration, pain score [11-point Visual Numerical Rating Scale (VNRS)], and failure. All primary outcomes were recorded after the first insertion.

    RESULTS: Data from 86 participants were analysed. Insertion duration (with standard deviation) was 2.72 ± 1.85 vs. 2.25 ± 0.55 min p = 0.12, pain score (VNRS) median [interquartile range] 3.5 [2-5] vs. 3 [2-5] p = 0.72 and failure 2/42 (5%) vs. 0/44 (0%) p = 0.24 for digital vs speculum respectively. There was no significant difference found between the two groups for all three primary outcomes. Induction to delivery 30.7 ± 9.4 vs 29.6 ± 11.5 h p = 0.64, Cesarean section 25/60 (64%) vs 28/64 (60%) RR 0.9 95% CI p = 0.7 and maternal satisfaction VNRS score with the birth process 7 [IQR 6-8] vs 7 [7-8] p = 0.97 for digital vs. speculum arms respectively. Other labor, delivery and neonatal secondary outcomes were not significantly different.

    CONCLUSION: Digital and speculum insertion in nulliparas with unripe cervixes had similar insertion performance. As digital insertion required less equipment and consumables, it could be the preferred insertion method for the equally adept and the insertion technique to train towards.

    TRIAL REGISTRATION: This trial was registered with ISRCTN registration number 13804902 on 15 November 2017.

  10. Hong JGS, Tan PC, Kamarudin M, Omar SZ
    BMC Pregnancy Childbirth, 2021 Feb 15;21(1):138.
    PMID: 33588801 DOI: 10.1186/s12884-021-03628-5
    BACKGROUND: Antenatal corticosteroids (ACS) are increasingly used to improve prematurity-related neonatal outcome. A recognized and common adverse effect from administration of antenatal corticosteroid is maternal hyperglycemia. Even normal pregnancy is characterized by relative insulin resistance and glucose intolerance. Treatment of maternal hyperglycemia after ACS might be indicated due to the higher risk of neonatal acidosis which may coincide with premature birth. Metformin is increasingly used to manage diabetes mellitus during pregnancy as it is effective and more patient friendly. There is no data on prophylactic metformin to maintain euglycemia following antenatal corticosteroids administration.

    METHODS: A double blind randomized trial. 103 women scheduled to receive two doses of 12-mg intramuscular dexamethasone 12-hour apart were separately randomized to take prophylactic metformin or placebo after stratification according to their gestational diabetes (GDM) status. First oral dose of allocated study drug was taken at enrolment and continued 500 mg twice daily for 72 hours if not delivered. Six-point blood sugar profiles were obtained each day (pre- and two-hour post breakfast, lunch and dinner) for up to three consecutive days. A hyperglycemic episode is defined as capillary glucose fasting/pre-meal ≥ 5.3 mmol/L or two-hour post prandial/meal ≥ 6.7 mmol/L. Primary outcome was hyperglycemic episodes on Day-1 (first six blood sugar profile points) following antenatal corticosteroids.

    RESULTS: Number of hyperglycemic episodes on the first day were not significantly different (mean ± standard deviation) 3.9 ± 1.4 (metformin) vs. 4.1 ± 1.6 (placebo) p = 0.64. Hyperglycemic episodes markedly reduced on second day in both arms to 0.9 ± 1.0 (metformin) vs. 1.2 ± 1.0 (placebo) p = 0.15 and further reduced to 0.6 ± 1.0 (metformin) vs. 0.7 ± 1.0 (placebo) p = 0.67 on third day. Hypoglycemic episodes during the 3-day study period were few and all other secondary outcomes were not significantly different.

    CONCLUSIONS: In euglycemic and diet controllable gestational diabetes mellitus women, antenatal corticosteroids cause sustained maternal hyperglycemia only on Day-1. The magnitude of Day-1 hyperglycemia is generally low. Prophylactic metformin does not reduce antenatal corticosteroids' hyperglycemic effect.

    TRIAL REGISTRATION: The trial is registered in the ISRCTN registry on May 4 2017 with trial identifier https://doi.org/10.1186/ISRCTN10156101 .

  11. Sargunam PN, Bak LLM, Tan PC, Vallikkannu N, Noor Azmi MA, Zaidi SN, et al.
    BMC Pregnancy Childbirth, 2019 Dec 11;19(1):493.
    PMID: 31829138 DOI: 10.1186/s12884-019-2602-2
    BACKGROUND: Prolonged latent phase of labor is associated with adverse maternal and neonatal outcomes. Preliminary data indicate that labor induction for prolonged latent phase may reduce cesarean delivery. We performed a study powered to Cesarean delivery to evaluate labor induction compared to expectant management in full term nulliparas hospitalized for persistent contractions but non-progressive to established labor after an overnight stay.

    METHODS: From 2015 and 2017, nulliparas, ≥ 39 weeks' gestation with prolonged latent phase of labor (persistent contractions after overnight hospitalization > 8 h), cervical dilation ≤3 cm, intact membranes and reassuring cardiotocogram were recruited. Participants were randomized to immediate induction of labor (with vaginal dinoprostone or amniotomy or oxytocin as appropriate) or expectant management (await labor for at least 24 h unless indicated intervention as directed by care provider). Primary outcome measure was Cesarean delivery.

    RESULTS: Three hundred eighteen women were randomized (159 to each arm). Data from 308 participants were analyzed. Cesarean delivery rate was 24.2% (36/149) vs. 23.3%, (37/159) RR 1.0 95% CI 0.7-1.6; P = 0.96 in induction of labor vs. expectant arms. Interval from intervention to delivery was 17.1 ± 9.9 vs. 40.1 ± 19.8 h; P 

  12. Hong JGS, Vimaladevi A, Razif NA, Omar SZ, Tan PC
    BMC Pregnancy Childbirth, 2023 May 24;23(1):378.
    PMID: 37226087 DOI: 10.1186/s12884-023-05685-4
    BACKGROUND: A majority of pregnant women experience sleep disruption during pregnancy, especially in the third trimester. Lack of sleep is associated with preterm birth, prolonged labor and higher cesarean section rate. Six or less hours of night sleep in the last month of pregnancy is associated with a higher rate of caesarean births. Eye-masks and earplugs compared to headband improve night sleep by 30 or more minutes. We sought to evaluate eye-mask and earplugs compared to sham/placebo headbands on spontaneous vaginal delivery.

    METHODS: This randomized trial was conducted from December 2019-June 2020. 234 nulliparas, 34-36 weeks' gestation with self-reported night sleep 

  13. Vallikkannu N, Nadzratulaiman WN, Omar SZ, Si Lay K, Tan PC
    BMC Pregnancy Childbirth, 2014 Jan 28;14:49.
    PMID: 24468078 DOI: 10.1186/1471-2393-14-49
    BACKGROUND: External cephalic version (ECV) is offered to reduce the number of Caesarean delivery indicated by breech presentation which occurs in 3-4% of term pregnancies. ECV is commonly performed aided by the application of aqueous gel or talcum powder to the maternal abdomen. We sought to compare gel with powder during ECV on achieving successful version and increasing tolerability.

    METHOD: We enrolled 95 women (≥ 36 weeks gestation) on their attendance for planned ECV. All participants received terbutaline tocolysis. Regional anaesthesia was not used. ECV was performed in the standard fashion after the application of the allocated aid. If the first round (maximum of 2 attempts) of ECV failed, crossover to the opposing aid was permitted.

    RESULTS: 48 women were randomised to powder and 47 to gel. Self-reported procedure related median [interquartile range] pain scores (using a 10-point visual numerical rating scale VNRS; low score more pain) were 6 [5-9] vs. 8 [7-9] P = 0.03 in favor of gel. ECV was successful in 21/48 (43.8%) vs. 26/47 (55.3%) RR 0.6 95% CI 0.3-1.4 P = 0.3 for powder and gel arms respectively. Crossover to the opposing aid and a second round of ECV was performed in 13/27 (48.1%) following initial failure with powder and 4/21 (19%) after failure with gel (RR 3.9 95% CI 1.0-15 P = 0.07). ECV success rate was 5/13 (38.5%) vs. 1/4 (25%) P = 0.99 after crossover use of gel or powder respectively. Operators reported higher satisfaction score with the use of gel (high score, greater satisfaction) VNRS scores 6 [4.25-8] vs 8 [7-9] P = 0.01.

    CONCLUSION: Women find gel use to be associated with less pain. The ECV success rate is not significantly different.

    TRIAL REGISTRATION: The trial is registered with ISRCTN (identifier ISRCTN87231556).

  14. Langmia IM, Apalasamy YD, Omar SZ, Mohamed Z
    BMC Med Genet, 2015;16:63.
    PMID: 26286601 DOI: 10.1186/s12881-015-0202-1
    Preterm birth (PTB) is the major cause of death in newborn and the second major cause of death in children less than 5 years old worldwide. Genetic polymorphism has been implicated as a factor for the occurrence of preterm birth. The aim of this study is to evaluate whether polymorphism in the progesterone receptor (PGR) is associated with susceptibility to preterm birth.
  15. Raheem IA, Saaid R, Omar SZ, Tan PC
    BJOG, 2012 Jan;119(1):78-85.
    PMID: 21985500 DOI: 10.1111/j.1471-0528.2011.03151.x
    To compare oral nifedipine with intravenous labetalol in their rapidity to control hypertensive emergencies of pregnancy.
  16. Tan PC, Valiapan SD, Tay PY, Omar SZ
    BJOG, 2007 Jul;114(7):824-32.
    PMID: 17506788
    To compare concurrent oxytocin with dinoprostone pessary versus dinoprostone pessary in labour induction for nulliparas with an unfavourable cervix.
  17. Tan PC, Jacob R, Quek KF, Omar SZ
    BJOG, 2006 Jun;113(6):733-7.
    PMID: 16709219
    The association between female fetal sex and hyperemesis gravidarum is well established in European and North American populations. The association between female fetuses and severity of hyperemesis remains uncertain. A retrospective study based on case notes review of 166 Asian women hospitalised for hyperemesis was performed. Female fetuses were significantly associated with hyperemesis in our population (P= 0.004, OR 1.6, 95% CI 1.2-2.2) as well as associated with severe ketonuria and high urea. When both severe ketonuria and high urea were present at initial hospital admission for hyperemesis, 83% (95% CI 66-93) of the fetuses were female.
  18. Omar NS, Tan PC, Sabir N, Yusop ES, Omar SZ
    BJOG, 2013 Feb;120(3):338-45.
    PMID: 23145957 DOI: 10.1111/1471-0528.12054
    To evaluate the effect of suggesting coitus as a safe and effective means to expedite labour on pregnancy duration and requirement for labour induction.
  19. Tan PC, Alzergany MM, Adlan AS, Noor Azmi MA, Omar SZ
    BJOG, 2017 Jan;124(1):123-131.
    PMID: 27418179 DOI: 10.1111/1471-0528.14211
    OBJECTIVE: To evaluate immediate compared with on-demand full maternal oral feeding after caesarean delivery STUDY DESIGN: A randomised trial.

    SETTING: Obstetric unit of a university hospital in Kuala Lumpur, Malaysia.

    POPULATION: Women admitted for a planned caesarean under spinal anaesthesia.

    METHODS: Participants were randomised to a sandwich meal served immediately on return to the ward or on-demand.

    MAIN OUTCOME MEASURES: Primary outcomes were patient satisfaction VAS (visual analog scale of 100 mm) on the feeding regimen and vomiting at 24 hours.

    RESULTS: 453 women were initially enrolled, 395 were randomised and available for analysis. Median (full range) patient satisfaction VAS scores were 82 (15-100) versus 84 (0-100) mm, P = 0.88 and vomiting rates were 1/197 (0.5%) versus 2/198 (1.0%), P > 0.99 for immediate compared with on-demand feeding, respectively. The immediate versus on-demand arms first ate at a median of 105 (35-210) versus 165 (45-385) minutes, P 

  20. Vallikkannu N, Lam WK, Omar SZ, Tan PC
    BJOG, 2017 Jul;124(8):1274-1283.
    PMID: 27348806 DOI: 10.1111/1471-0528.14175
    OBJECTIVE: To evaluate the tolerability of cervical insulin-like growth factor binding protein 1 (IGFBP-1) and its value as a predictor of successful labour induction, compared with Bishop score and transvaginal ultrasound (TVUS) cervical length.

    DESIGN: A prospective study.

    SETTING: A tertiary hospital in Malaysia.

    POPULATION: A cohort of 193 term nulliparous women with intact membranes.

    METHODS: Prior to labour induction, cervical fluid was obtained via a vaginal speculum and tested for IGFBP-1, followed by TVUS and finally Bishop score. After each assessment the procedure-related pain was scored from 0 to 10. Cut-off values for Bishop score and cervical length were obtained from the receiver operating characteristic (ROC) curve. Multivariable logistic regression analysis was performed.

    MAIN OUTCOMES MEASURES: Vaginal delivery and vaginal delivery within 24 hours of starting induction.

    RESULTS: Bedside IGFBP-1 testing is better tolerated than Bishop score, but is less well tolerated than TVUS [median (interquartile range) of pain scores: 5 (4-5) versus 6 (5-7) versus 3 (2-3), respectively; P < 0.001]. IGFBP-1 independently predicted vaginal delivery (adjusted odds ratio, AOR 5.5; 95% confidence interval, 95% CI 2.3-12.9) and vaginal delivery within 24 hours of induction (AOR 4.9; 95% CI 2.1-11.6) after controlling for Bishop score (≥4 or ≥5), cervical length (≤29 or ≤27 mm), and other significant characteristics for which the Bishop score and TVUS were not predictive of vaginal delivery after adjustment. IGFBP-1 has 81% sensitivity, 59% specificity, positive and negative predictive values of 82 and 58%, respectively, and positive and negative likelihood ratios of 2.0 and 0.3 for vaginal delivery, respectively.

    CONCLUSION: IGFBP-1 better predicted vaginal delivery than BS or TVUS, and may help guide decision making regarding labour induction in nulliparous women.

    TWEETABLE ABSTRACT: IGFBP-1: a stronger independent predictor of labour induction success than Bishop score or cervical sonography.

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