Displaying publications 61 - 80 of 125 in total

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  1. Abas MN, Tan PC, Azmi N, Omar SZ
    Obstet Gynecol, 2014 Jun;123(6):1272-1279.
    PMID: 24807340 DOI: 10.1097/AOG.0000000000000242
    OBJECTIVE: To compare ondansetron with metoclopramide in the treatment of hyperemesis gravidarum.

    METHODS: We enrolled 160 women with hyperemesis gravidarum in a double-blind randomized trial. Participants were randomized to intravenous 4 mg ondansetron or 10 mg metoclopramide every 8 hours for 24 hours. Participants kept an emesis diary for 24 hours; at 24 hours, they expressed their well-being using a 10-point visual numeric rating scale and answered an adverse effects questionnaire. Nausea intensity was evaluated using a 10-point visual numeric rating scale at enrollment and at 8, 16, and 24 hours. Primary analysis was on an intention-to-treat basis.

    RESULTS: Eighty women each were randomized to ondansetron or metoclopramide. Median well-being visual numeric rating scale scores were 9 (range, 5-10) compared with 9 (range, 4-10) (P=.33) and vomiting episodes in the first 24 hours were 1 (range, 0-9) compared with 2 (range, 0-23) (P=.38) for ondansetron compared with metoclopramide, respectively. Repeat-measures analysis of variance of nausea visual numeric rating scale showed no difference between study drugs (P=.22). Reported rates of drowsiness (12.5% compared with 30%; P=.01; number needed to treat to benefit, 6), xerostomia (10.0% compared with 23.8%; P

  2. Tan PC, Soe MZ, Sulaiman S, Omar SZ
    Obstet Gynecol, 2013 Feb;121(2 Pt 1):253-259.
    PMID: 23344273 DOI: 10.1097/AOG.0b013e31827e7fd9
    OBJECTIVE: To compare immediate with delayed (4 hours) oxytocin infusion after amniotomy on vaginal delivery within 12 hours and patient satisfaction with the birth process.

    METHODS: Parous women with favorable cervixes after amniotomy for labor induction were randomized to immediate titrated oxytocin or placebo intravenous infusion in a double-blind noninferiority trial. After 4 hours, study infusions were stopped, the women were assessed, and open-label oxytocin was started if required. Maternal satisfaction with the birth process was assessed with a 10-point visual numerical rating scale (lower score, greater satisfaction).

    RESULTS: Vaginal delivery rates at 12 hours were 91 of 96 (94.8%) compared with 91 of 94 (96.8%) (relative risk 0.98, 95% confidence interval [CI] 0.92-1.04, P=.72), and maternal satisfaction on a visual numerical rating scale (median [interquartile range]) was 3 [3-4] compared with 3 [3-5], P=.36 for immediate compared with delayed arm, respectively). Cesarean delivery, maternal fever, postpartum hemorrhage, uterine hyperactivity, and adverse neonatal outcome rates were similar between arms. The immediate oxytocin arm had a shorter amniotomy-to-delivery interval of 5.3±3.1 compared with 6.9±2.9 hours (P

  3. Tan PC, Khine PP, Vallikkannu N, Omar SZ
    Obstet Gynecol, 2010 May;115(5):975-981.
    PMID: 20410771 DOI: 10.1097/AOG.0b013e3181d99290
    OBJECTIVE: To compare the effects of promethazine with those of metoclopramide for hyperemesis gravidarum.

    METHODS: Women at their first hospitalization for hyperemesis gravidarum were approached when intravenous antiemetic therapy was needed. They were randomly assigned to receive 25 mg promethazine or 10 mg metoclopramide every 8 hours for 24 hours in a double-blind study. Primary outcomes were vomiting episodes by diary and well-being visual numerical rating scale score (10-point scale) in the 24-hour main study period. Participants also filled out an adverse-effects questionnaire at 24 hours and a nausea visual numerical rating scale score at recruitment and at 8, 16, and 24 hours.

    RESULTS: A total of 73 and 76 women, randomized to metoclopramide and promethazine, respectively, were analyzed. Median vomiting episodes were one (range 0-26) compared with two (range 0-26) (P=.81), and well-being visual numerical rating scale scores were 8 (range 1-10) compared with 7 (range 2-10) (P=.24) for metoclopramide and promethazine, respectively. Repeat-measures analysis of variance of the nausea visual numerical rating scale scores showed no significant difference between study drugs (F score=0.842, P=.47). Reported drowsiness (58.6% compared with 83.6%, P=.001, number needed to treat to benefit [NNTb] 5), dizziness (34.3% compared with 71.2%, P

  4. Hamdan M, Sidhu K, Sabir N, Omar SZ, Tan PC
    Obstet Gynecol, 2009 Oct;114(4):745-751.
    PMID: 19888030 DOI: 10.1097/AOG.0b013e3181b8fa00
    OBJECTIVE: To estimate the effect of serial membrane sweeping on the onset of labor in women who planned vaginal birth after cesarean (VBAC).

    METHODS: Women at term with one transverse lower segment cesarean delivery who were suitable for and who planned VBAC were approached to participate. Participants were randomly assigned to weekly membrane sweeping or weekly vaginal assessment for Bishop score until delivery. Participants and delivery providers were blinded to the allocated treatment. Standard obstetric care was given to all participants. The primary outcome was onset of labor which was defined as the presence of spontaneous regular and painful contractions that cause cervical dilation to at least 3 cm or prelabor rupture of membranes. Secondary outcomes included induction of labor and repeat cesarean delivery.

    RESULTS: One hundred eight women were randomly assigned to membrane sweeping and 105 to control. The spontaneous labor rate was 78.5% compared with 72.1% (relative risk [RR] 1.1, 95% confidence interval [CI] 0.9-1.3; P=.34), the induction of labor rate was 12.1% compared with 9.6% (RR 1.3, 95% CI 0.6-2.8; P=.66), and the all-cause cesarean delivery rate was 40.2% compared with 44.2% (RR 0.9, 95% CI 0.7-1.2; P=.58) for the membrane sweeping and control groups, respectively. Gestational age at delivery (mean+/-standard deviation) of 39.6+/-1.0 weeks for the membrane sweeping group compared with 39.6+/-0.9 weeks for the control group (P=.84) was no different.

    CONCLUSION: Serial membrane sweeping at term in women who planned VBAC has no significant effect on the onset of labor, pregnancy duration, induction of labor, or repeat cesarean delivery.

    CLINICAL TRIAL REGISTRATION: ISRCTN, isrctn.org, ISRCTN55163179.

    LEVEL OF EVIDENCE: I.

  5. Tan PC, Rajasingam G, Devi S, Omar SZ
    Obstet Gynecol, 2008 May;111(5):1111-7.
    PMID: 18448743 DOI: 10.1097/AOG.0b013e31816a49fc
    To estimate prevalence rate of recent dengue infection in parturients, as well as the vertical transmission rate, and to compare pregnancy outcomes among infected women.
  6. Tan PC, Andi A, Azmi N, Noraihan MN
    Obstet Gynecol, 2006 Jul;108(1):134-40.
    PMID: 16816067
    To determine coital incidence at term and to estimate its effect on labor onset and mode of delivery.
  7. Khairudin MN, Vallikkannu N, Gan F, Hamdan M, Tan PC
    Am J Obstet Gynecol MFM, 2024 Apr;6(4):101324.
    PMID: 38447674 DOI: 10.1016/j.ajogmf.2024.101324
    BACKGROUND: Labor pain varies significantly among pregnant women, ranging from mild to extremely distressing. Nonpharmacologic pain relief methods during vaginal birth are increasingly popular, either as a complement to pharmacologic agents or, at times, as the primary method of pain relief. Multiple trials have reported that manual or by-hand massage reduces labor pain. The effectiveness of full-body mechanical massage using electric massage chairs on labor pain remains unexplored.

    OBJECTIVE: This study aimed to evaluate mechanical massage using an electric massage chair on labor pain in nulliparous women.

    STUDY DESIGN: A randomized counterbalanced crossover trial was conducted in a university hospital in Malaysia from August 2022 to February 2023. Eligible nulliparas in labor with a minimum labor pain score of 5 (0-10 numerical rating scale) were enrolled. Participants were randomized to 30 minutes on the massage chair with mechanical massage followed by 30 minutes on the massage chair without mechanical massage or the other way around in the massage sequence. The primary outcome was a change in pain score comparing pain with and without mechanical massage as a paired comparison for the entire trial participants. The secondary outcomes were across arms analyses of maternal and neonatal outcomes. The paired t test, t test, Mann-Whitney U test, chi-square test, and Fisher exact test were used as appropriate for the data.

    RESULTS: Overall, 208 women were randomized: 104 to each intervention. Data were available from 204 participants (103 randomized to massage first and 101 to no massage first). The primary outcomes of change in labor pain scores (0-10 numerical rating scale) after massage and no massage (all participants included after crossover, paired t test analysis) were 4.51±2.30 and 5.38±2.10, respectively (mean difference, -0.87; 95% confidence interval, -1.14 to -0.59; P

  8. Mohd Yassin NA, Kamarudin M, Hamdan M, Tan PC
    Am J Obstet Gynecol MFM, 2024 May;6(5):101308.
    PMID: 38336174 DOI: 10.1016/j.ajogmf.2024.101308
    BACKGROUND: The global cesarean delivery rate is high and continues to increase. A bladder catheter is usually placed for the cesarean delivery because a distended bladder is assumed to be at higher risk of injury during surgery and to compromise surgical field exposure. Preliminary data suggest that self bladder emptying (no catheter) at cesarean delivery may have advantages and be safe.

    OBJECTIVE: This study aimed to compare the effects of self bladder emptying and indwelling Foley bladder catheterization for planned cesarean delivery on the rate of postpartum urinary retention and maternal satisfaction.

    STUDY DESIGN: A randomized controlled trial was conducted in a tertiary university hospital from January 10, 2022 to March 22, 2023. A total of 400 participants scheduled for planned cesarean delivery were randomized: 200 each to self bladder emptying or indwelling Foley catheter. The primary outcomes were postpartum urinary retention (overt and covert) and maternal satisfaction with allocated bladder care. Analyses were performed using t test, Mann-Whitney U test, chi-square test, or Fisher exact test, as appropriate. Logistic regression was used to adjust for differences in characteristics.

    RESULTS: Postpartum urinary retention rates were 1 per 200 (0.6%) and 0 per 200 (P>.99) (a solitary case of covert retention) and maternal satisfaction scores (0-10 visual numerical rating scale), expressed as median (interquartile range) were 9 (8-9.75) and 8 (8-9) (P=.003) in the self bladder emptying and indwelling Foley catheter arms, respectively. Regarding secondary outcomes, time to flatus passage, satisfactory ambulation, urination, satisfactory urination, satisfactory breastfeeding, and postcesarean hospital discharge was quickened in the self bladder emptying group. Pain scores at first urination were decreased and no lower urinary tract symptom was more likely to be reported with self bladder emptying. Surgical field view, operative blood loss, duration of surgery, culture-derived urinary tract infection, postvoid residual volume, and pain score at movement were not different. There was no bladder injury.

    CONCLUSION: Self bladder emptying increased maternal satisfaction without adversely affecting postpartum urinary retention. Recovery was enhanced and urinary symptoms were improved. The surgeon was not impeded at operation. No safety concern was found.

  9. Hashim E, Hong J, Woo YL, Hamdan M, Tan PC
    Obstet Gynecol, 2024 Jul 01;144(1):53-59.
    PMID: 38703361 DOI: 10.1097/AOG.0000000000005597
    OBJECTIVE: To compare insertion failure rates for Pipelle endometrial sampling with a full bladder compared with the standard process (not taking into account bladder status) without cervical manipulation.

    METHODS: A single-masked randomized trial was conducted in a single tertiary care center from July 2021 to January 2022. Two hundred fourteen participants aged 18 years or older who were scheduled for outpatient Pipelle endometrial sampling were randomized: 107 each to having a full bladder (by oral water intake) or standard process (without delayed sampling and bladder status not taken into account). Women with known cervical stenosis, gynecologic malignancy, uterine anomalies, leiomyoma distorting the uterine cavity, acute cervicitis, urge bladder dysfunction, intense anxiety, need for anesthesia or analgesic before the procedure, positive pregnancy test, or previous failed office endometrial sampling were excluded. The primary outcome was the insertion failure rate of endometrial sampling at first attempt. Secondary outcomes were pain during procedure, satisfaction score, analgesia use, procedure duration, and need for cervical manipulation. Factoring in a baseline insertion failure rate of 30.0%, relative risk of 0.45, α of 0.05, 80.0% power, and a dropout rate of 10.0%, we needed 107 participants in each arm.

    RESULTS: The insertion failure rate was significantly lower in the full bladder group compared with standard process: 25 of 107 (23.4%) compared with 45 of 107 (42.1%) (relative risk 0.56, 95% CI, 0.37-0.84; number needed to treat to benefit 6.0, 95% CI, 3.20-15.70). Pain score (median) during the procedure (interquartile range) was 4 (3-6) compared with 5 (3-8) ( P =.004); patient satisfaction score was 8 (7-9) compared with 7 (4-8) ( P

  10. Teo IH, Hong J, Tan PC, Lim BK
    Cureus, 2022 Dec;14(12):e32226.
    PMID: 36620851 DOI: 10.7759/cureus.32226
    Background Women experience significant sleep disruption throughout pregnancy. Lack of sleep during the last month of pregnancy is associated with longer labor, a higher rate of Cesarean births, gestational diabetes, hypertension, and preterm birth. Eye-mask and earplugs through sensory deprivation increase sleep duration and quality in patients in the intensive care environment but their impact at home or during pregnancy is not known. We sought to evaluate eye-mask and earplugs compared to sham/placebo headbands on night sleep duration in pregnancy. Materials and methods A randomized trial was performed in a university hospital in Malaysia. Nulliparas between 34 and 36 weeks of gestation with self-reported night sleep of fewer than six hours were randomized to the use of eye-mask and earplugs or "sham" headbands during night sleep (both introduced as sleep aids). Night sleep duration was measured through a wrist actigraphy monitor during non-intervention week one and intervention week two with the allocated sleep aid. Results Data from 56 participants were analyzed on an intention-to-treat basis. Mean night sleep duration increased in intervention week two compared to non-intervention week one in both trial arms, which were 279 ± 19 vs. 304 ± 19 minutes (mean increase of 25 minutes) p = <0.001 and 286 ± 21 vs. 302 ± 22 minutes (mean increase of 16 minutes) p = <0.001 for eye-masks-earplugs and headband respectively. However, the mean increase in night sleep duration across trial arms (p=0.13) was not significant. A higher proportion of participants in the eye-masks and earplugs arm had their night sleep duration increased by at least 30 minutes, 13/29 (45%) vs. 5/26 (19%), relative risk (RR) 2.3 (95% CI 1.0-5.6) p = 0.04, more likely to agree that they slept better 19/29 (66%) vs. 7/27 (26%), RR 2.2 (95% CI 1.1-4.6) p = 0.03, expressed higher satisfaction score with their sleep aid 7 (7.0-7.5) vs. 6 (5-7), p = 0.003 and had lower induction of labor rates 4/29 (14%) vs. 12/27 (44%), RR 0.3 (95%CI 0.1-0.8) p = 0.02. Conclusion Eye masks and earplugs use in nulliparas with short night sleep duration in late pregnancy, lengthen their night sleep duration over baseline. Sleep is reportedly better and maternal satisfaction is higher with eye masks and earplugs use.
  11. Morad Z, Lee DG, Lim YN, Tan PC
    Perit Dial Int, 2005 9 24;25(5):426-31.
    PMID: 16178472
  12. Tan PC, Zaidi SN, Azmi N, Omar SZ, Khong SY
    PLoS One, 2014;9(3):e92036.
    PMID: 24637791 DOI: 10.1371/journal.pone.0092036
    To evaluate the temporal and case-controlled correlations of anxiety, depression and stress with hyperemesis gravidarum.
  13. Tan PC, Soe MZ, Si Lay K, Wang SM, Sekaran SD, Omar SZ
    PLoS Negl Trop Dis, 2012;6(5):e1637.
    PMID: 22590658 DOI: 10.1371/journal.pntd.0001637
    Dengue is the most prevalent mosquito borne infection worldwide. Vertical transmissions after maternal dengue infection to the fetus and pregnancy losses in relation to dengue illness have been reported. The relationship of dengue to miscarriage is not known.
  14. Lee IL, Tan TC, Tan PC, Nanthiney DR, Biraj MK, Surendra KM, et al.
    Parasitol Res, 2012 Apr;110(4):1553-62.
    PMID: 22076050 DOI: 10.1007/s00436-011-2665-0
    Blastocystis sp. is a common intestinal parasite. To date, there have been sporadic and scanty studies on Blastocystis sp. carried out in rural communities in Nepal. We surveyed the prevalence of Blastocystis sp. and its possible associated risk factors, and reported the predominant Blastocystis sp. subtype in two rural communities, Bolde Phediche and Bahunipati, in Nepal. Human faecal samples were collected from 241 participants, cultured using in vitro cultivation and examined for Blastocystis sp. The presence of Blastocystis sp. in faecal samples was further confirmed by polymerase chain reaction (PCR) and subsequently genotyped using subtype-specific sequence tagged site (STS) primers. There were 26.1% (63/241) of the participants that were infected by Blastocystis sp. We detected 84.1% (53/63) of Blastocystis sp. subtype 4 infections in these rural communities. The unusually high prevalence of Blastocystis sp. subtype 4 can be attributed to the rearing of family-owned animals in barns built close to their houses. Eighty one percent (51/63) of the Blastocystis sp. infected participants drank not boiled or unfiltered water. The present study revealed that Blastocystis sp. could pose a health concern to the communities and travellers to the hilly area in Nepal. Infection may be transmitted through human-to-human, zoonotic and waterborne transmissions. We provide recommendations to ensure good public health practices.
  15. Tan PC, Khine PP, Sabdin NH, Vallikkannu N, Sulaiman S
    J Ultrasound Med, 2011 Feb;30(2):227-33.
    PMID: 21266561
    OBJECTIVES: The purpose of this study was to evaluate cervical length changes after membrane sweeping and the effect of cervical shortening on pregnancy outcomes.

    METHODS: Low-risk women at 40 weeks' gestation undergoing membrane sweeping to expedite labor were recruited. Participants were scheduled for labor induction at 41 weeks' gestation. Transvaginal ultrasonography was performed immediately before and after membrane sweeping to measure the cervical length. Three presweep and postsweep cervical lengths were measured. The shortest lengths before and after the sweep were taken as the representative lengths. The effect of membrane sweeping on cervical length was analyzed. Multivariable logistic regression analysis was performed to evaluate the effect of cervical shortening on labor induction and the mode of delivery.

    RESULTS: For the 160 participants, the mean presweep cervical length ± SD was 21.0 ± 10.0 mm; the postsweep length was 23.8 ± 10.9 mm, an average increase of 2.8 ± 0.6 mm (P < .001). Cervical shortening after membrane sweeping was noted in 53 of 160 cases (33%). Cervical shortening was associated with a reduction in all-cause cesarean delivery but not labor induction on bivariate analysis. After adjustment for maternal age, parity, presweep Bishop score, postsweep cervical length, oxytocin augmentation, epidural analgesia, and meconium-stained fluid, cervical shortening after membrane sweeping was independently predictive of a reduction in cesarean deliveries (adjusted odds ratio, 0.24; 95% confidence interval, 0.06-0.90; P = .034).

    CONCLUSIONS: Membrane sweeping was associated with lengthening of the cervix. A shortened cervix after sweeping was independently predictive of vaginal delivery.

  16. Vani S, Lau SY, Lim BK, Omar SZ, Tan PC
    Int J Gynaecol Obstet, 2009 Jan;104(1):28-31.
    PMID: 18922525 DOI: 10.1016/j.ijgo.2008.08.014
    To evaluate the success of external cephalic version (ECV) using an adjusted bolus dose of intravenous salbutamol compared with no tocolysis.
  17. Wee YC, Tan KL, Tan PC, Yap SF, Tan JAMA
    Med J Malaysia, 2005 Oct;60(4):447-53.
    PMID: 16570706
    Haemoglobin Bart's hydrops foetalis syndrome (--SEA/--SEA) is not compatible with life and contributes to a majority of the hydropic foetuses in the Malaysian Chinese alpha-thalassaemia carriers who possess the 2-alpha-gene deletion in cis (--SEA/alphaalpha). A duplex-PCR which simultaneously amplifies a normal 136 bp sequence between the psialpha-alpha2-globin genes and a 730 bp Southeast Asian deletion-specific sequence (--SEA) between the psialpha2-theta1-globin genes was established. The duplex-PCR which detects the --SEA deletion in both chromosomes serves as a rapid and cost-effective confirmatory test in the antenatal diagnosis of Haemoglobin Bart's hydrops foetalis syndrome in Malaysia. In addition, the duplex-PCR is simple to perform as both the normal and deletion-specific alpha-globin gene sequences are amplified in the same PCR reaction.
  18. Tan PC, Mackeen A, Khong SY, Omar SZ, Noor Azmi MA
    Sci Rep, 2016 Mar 18;6:23223.
    PMID: 26987593 DOI: 10.1038/srep23223
    A peripheral intravenous catheter is often inserted as part of care during labour. The catheter is inserted into the back of the hand or lower forearm vein in usual practice. There is no trial data to guide the care provider on which is the better insertion site in any clinical setting. 307 women admitted to the labour ward who required insertion of intravenous catheter were randomised to back of hand or lower forearm vein catheter insertion. Catheter insertion is by junior to mid-grade providers. We evaluated insertion success at the first attempt, pain during insertion and catheter replacement due to malfunction as main outcomes. After catheter removal, we recorded patient satisfaction with site, future site preference and insertion site swelling, bruising, tenderness, vein thrombosis and pain. Insertion of a catheter into back of hand vein is more likely to be successful at the first attempt. Insertion pain score, catheter replacement rate, patient satisfaction, patient fidelity to site in a future insertion and insertion site complications rate are not different between trial arms. In conclusion, both insertion sites are suitable; the back of the hand vein maybe easier to cannulate and seems to be preferred by our frontline providers.
  19. Razali N, Md Latar IL, Chan YK, Omar SZ, Tan PC
    PMID: 26773246 DOI: 10.1016/j.ejogrb.2015.12.017
    OBJECTIVE: To evaluate the uterotonic effect of carbetocin compared with oxytocin in emergency cesarean delivery.

    STUDY DESIGN: Participants were randomized to intravenous bolus injection of 100mcg carbetocin or 10IU oxytocin after cesarean delivery of the baby. The primary outcome is any additional uterotonic which may be administered by the blinded provider for perceived inadequate uterine tone with or without hemorrhage in the first 24hours after delivery. Secondary outcomes include operating time, perioperative blood loss, change in hemoglobin and hematocrit levels, blood transfusion and reoperation for postpartum hemorrhage.

    RESULTS: Additional uterotonic rates were 107/276 (38.8%) vs. 155/271 (57.2%) [RR 0.68 95% CI 0.57-0.81 p<0.001; NNTb 6 95% CI 3.8-9.8], mean operating time 45.9±16.0 vs. 44.5±13.1minutes p=0.26, mean blood loss 458±258 vs. 446±281ml p=0.6, severe postpartum hemorrhage (≥1000ml) rates 15/276 (5.4%) vs. 10/271 (3.7%) p=0.33 and blood transfusion rates 6/276 (2.2%) vs. 10/271 (3.7%); p=0.30 for carbetocin and oxytocin arms respectively. There was only one case of re-operation (oxytocin arm). In the cases that needed additional uterotonic 98% (257/262) was started intraoperatively and in 89% (234/262) the only additional uterotonic administered was an oxytocin infusion over 6hours.

    CONCLUSION: Fewer women in the carbetocin arm needed additional uterotonics but perioperative blood loss, severe postpartum hemorrhage, blood transfusion and operating time were not different.

  20. Chen JJ, Tan JA, Chua KH, Tan PC, George E
    BMJ Open, 2015 Jul 22;5(7):e007648.
    PMID: 26201722 DOI: 10.1136/bmjopen-2015-007648
    OBJECTIVES: Single nucleotide polymorphism (SNP) with a mutation can be used to identify the presence of the paternally-inherited wild-type or mutant allele as result of the inheritance of either allele in the fetus and allows the prediction of the fetal genotype. This study aims to identify paternal SNPs located at the flanking regions upstream or downstream from the β-globin gene mutations at CD41/42 (HBB:c.127_130delCTTT), IVS1-5 (HBB:c.92+5G>C) and IVS2-654 (HBB:c.316-197C>T) using free-circulating fetal DNA.

    SETTING: Haematology Lab, Department of Biomedical Science, University of Malaya.

    PARTICIPANTS: Eight couples characterised as β-thalassaemia carriers where both partners posed the same β-globin gene mutations at CD41/42, IVS1-5 and IVS2-654, were recruited in this study.

    OUTCOME MEASURES: Genotyping was performed by allele specific-PCR and the locations of SNPs were identified after sequencing alignment.

    RESULTS: Genotype analysis revealed that at least one paternal SNP was present for each of the couples. Amplification on free-circulating DNA revealed that the paternal mutant allele of SNP was present in three fcDNA. Thus, the fetuses may be β-thalassaemia carriers or β-thalassaemia major. Paternal wild-type alleles of SNP were present in the remaining five fcDNA samples, thus indicating that the fetal genotypes would not be homozygous mutants.

    CONCLUSIONS: This preliminary research demonstrates that paternal allele of SNP can be used as a non-invasive prenatal diagnosis approach for at-risk couples to determine the β-thalassaemia status of the fetus.

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