Search PubMed⌕ Search

Biomedical subjects

T Tongsong

Publications and source records attributed to T Tongsong.

At least 37 records · Page 2Linked to original sources
PubMed2001

Neural tube defects: a different pattern in northern Thai population.

The objective of this descriptive study was to describe the demographic and sonographic patterns of fetal neural tube defects (NTDs) in Thai pregnant women. The study was conducted at Maharaj Nakorn Chiang Mai Hospital, Chiang Mai University. The subjects included all pregnancies with diagnosis of fetal neural tube defects. Basic clinical data of the subjects was prospectively collected at the time of diagnosis for NTDs and followed-up until delivery. Antenatal diagnosis was based on sonographic criteria. The results showed that the incidence of NTDs was 0.66/1,000 births, however, spina bifida was very rare, found in only 0.06/1,000 births, similar to encephalocele. All anencephalic fetuses had no concurrent spina bifida, and only a few cases had other associated anomalies. Ultrasound was able to diagnose NTDs with very high accuracy. All cases of antenatal diagnosis were electively terminated. In conclusion, NTDs in the Thai population were rather rare when compared to that of the Europeans and spina bifida was extremely rare. The accuracy of antenatal diagnosis of NTDs with ultrasound was highly reliable.

Adolescent↗
PubMed2001

Therapeutic termination of second trimester pregnancy with vaginal misoprostol.

OBJECTIVE: To evaluate the efficacy of vaginal misoprostol in therapeutic termination of second trimester pregnancy with a live fetus. DESIGN: Prospective descriptive study. SETTING: Maharaj Nakorn Chiang Mai Hospital, Department of Obstetrics and Gynecology, Faculty of Medicine, Chiang Mai University. SUBJECTS: Pregnant women meeting the inclusion criteria including 1) pregnancy with a live fetus, 2) gestational age of 14-28 weeks, 3) having an indication for therapeutic termination, 4) Bishop's score of < or = 4, 5) absence of uterine contraction and leakage of amniotic fluid, 6) no previous classical uterine scar and 7) no contraindication for misoprostol such as hypersensitivity. INTERVENTION: 400 microgram misoprostol gel intravagina every 12 hours. MAIN OUTCOME MEASURES: Mean induction-delivery time, mean abortion time, maternal side effects. RESULTS: Sixty eight pregnant women were recruited into the study. The mean induction-delivery time was 35.58 +/- 34.13 hours, mean abortion time was 35.80 +/- 34.13 minutes. Fever was the most common side effect occuring in about two-third of the patients, but no serious maternal complication was observed. CONCLUSION: 400 microgram vaginal misoprostol is effective for therapeutic termination of second trimester pregnancy with no serious side effects. However, the response to this treatment was markedly varied from patient to patient.

Abortifacient Agents, Nonsteroidal↗
PubMed2001

Prenatal diagnosis of hemoglobin Bart's hydrops fetalis by HPLC analysis of hemoglobin in fetal blood samples.

Since HbF and HbA are not found in fetuses with Hb Bart's hydrops fetalis the feasibility of prenatal diagnosis of homozygous alpha-thalassemia 1 by fetal hemoglobin typing was examined. Blood samples were obtained from fetuses at 18 to 22 weeks of gestation by cordocentesis in 32 pregnant women at risk of having a child with homozygous alpha-thalassemia 1 (alpha-thal-1). The samples were analyzed by a PCR-based method for the diagnosis of alpha-thal-1 (SEA type) and the proportion of hemoglobin fractions were determined by automated HPLC. DNA analysis showed that 8 of the 32 fetuses were homozygotes for alpha-thal-1, 17 were heterozygous for alpha-thal-1 (alpha-thal-1 trait), and a normal complement of four a-globin genes was found in 7 cases. The Hb typing in fetuses with homozygous alpha-thal-1 showed a peak of unbound Hb (Hb Bart's and Hb Portland) and no HbF, HbA and HbA The alpha-thal-1 trait chromatograms showed unbound Hb, pre HbF, HbF and HbA peaks. The chromatogram of normal fetuses showed HbF and HbA peaks without HbA2. In these cases the HbA proportion is between 3% and 10% with no apparent differences between the 18h and 22nd week of gestation. As the analysis of fetal Hb types by HPLC is facile and speedy and the results correspond with those obtained by DNA analysis, fetal Hb typing by automated HPLC is a convenient prenatal diagnostic method for homozygous alpha-thal-1. The method is recommended for prenatal diagnosis in populations with a high frequency of alpha-thal-1.

Base Sequence↗
PubMed2001

Second trimester pregnancy termination with 800 mcg vaginal misoprostol.

OBJECTIVE: To demonstrate the efficacy of 800 microgram vaginal misoprostol tablet for second trimester pregnancy termination. DESIGN: Prospective descriptive study. SETTING: Maharaj Nakorn Chiang Mai Hospital, Department of Obstetrics and Gynecology, Faculty of Medicine, Chiang Mai University. SUBJECT: Pregnant women meeting the inclusion criteria including (1) singleton pregnancy with live fetus, (2) gestational age of 14-28 weeks, (3) indication for therapeutic termination, (4) closed and uneffaced cervix, (5) absence of uterine contraction and leakage of amniotic fluid, (6) no previous classical uterine scar, (7) no contraindication for misoprostol such as hypersensitivity. INTERVENTION: 800 microgram misoprostol tablet intravagina every 12 hours. MAIN OUTCOME MEASURES: Mean induction delivery time, mean abortion time, maternal side effects. RESULTS: The mean induction delivery time was 21.38 + 13.68 hours, mean abortion time was 21.56 +/- 13.68 hours. Diarrhea was the most common side effect occuring in 40 per cent of patients. CONCLUSIONS: 800 mcg vaginal misoprostol every 12 hours is effective but if we want high efficacy along with fewer side effects, lower dose and interval should be further studied.

Abortifacient Agents, Nonsteroidal↗
PubMed2001

A comparison between 50 mcg oral misoprostol every 4 hours and 6 hours for labor induction: a prospective randomized controlled trial.

OBJECTIVE: To compare the effectiveness and safety between 50 mcg oral misoprostol every 4 hours and 6 hours for labor induction. DESIGN: A prospective randomized controlled trial. SETTING: Department of Obstetrics & Gynecology, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand. SUBJECTS: Eighty nine pregnant women of at least 34 weeks' gestation with indications for labor induction in the condition of unfavourable cervix (Bishop score < or = 4) and no contraindication to prostaglandin therapy. INTERVENTIONS: All pregnant women were randomized to receive either 50 mcg misoprostol orally every 4 hours or 6 hours. MAIN OUTCOME MEASURES: Treatment interval from induction to vaginal delivery, maternal and neonatal complication. RESULTS: The mean treatment intervals from induction to vaginal delivery were 22.10 +/- 18.49 hours and 20.91 +/- 11.98 hours in the misoprostol group every 4 hours and 6 hours, respectively. The treatment intervals between the two groups were not statistically significant. There was also no significant difference between both groups with regard to maternal and neonatal complications. CONCLUSION: The effectiveness in terms of treatment interval from induction to vaginal delivery were comparable between the two groups, but administration of misoprostol every 6 hours was found to have a slightly shorter interval, although it did not reach statistical significance. No serious maternal and neonatal complication was demonstrated in both groups. Either regimen in this study can be an alternative for labor induction.

Administration, Oral↗
PubMed2000

Prenatal sonographic diagnosis of ellis-van creveld syndrome.

Ellis-van Creveld syndrome (chondroectodermal dysplasia) is a rare autosomal recessive disorder characterized by a narrow thorax with short ribs, short extremities with polydactyly, and heart defects. A woman underwent sonographic examination at 27 weeks' menstrual age to rule out anomalies because of premature labor. Sonography revealed a live fetus with short long bones, polydactyly in the hands and feet, a narrow thorax with short ribs, and an atrial septal defect. All bony structures were of normal hyperechogenicity. The placenta appeared normal and was located at the posterior uterine wall; the amniotic fluid volume was also normal. These findings led to the diagnosis of short-rib dysplasia, most likely Ellis-van Creveld syndrome. The preterm labor stopped but spontaneously recurred at 35 weeks, when a 2,320-g female infant was vaginally delivered. The infant died of pulmonary insufficiency shortly after birth. Postmortem examination confirmed the prenatal findings. We conclude that Ellis-van Creveld syndrome can be readily diagnosed by prenatal sonography in the third trimester.

Adult↗
PubMed2000

Prenatal sonographic diagnosis of Holt-Oram syndrome.

Holt-Oram syndrome is an autosomal dominant disorder characterized by heart defects in combination with characteristic upper-limb abnormalities. A woman with no family history of genetic diseases underwent prenatal sonography at 25 weeks' menstrual age to screen for fetal anomalies. Sonography revealed abnormalities in the upper limbs and heart. The limb abnormalities included bilateral absence of radii and thumbs: the left hand had no carpal or metacarpal bones, and each of the 4 fingers on that hand had only 1 phalangeal bone. Cardiac malformations included an atrial septal defect and Ebstein's anomaly. Other structures were normal. Prenatal cytogenetic analysis by cordocentesis revealed a normal 46,XY karyotype. Spontaneous labor and delivery at 34 weeks' menstrual age produced a 1,960-g male infant who died of cardiac insufficiency shortly after birth. The postnatal appearance and autopsy findings confirmed the prenatal findings. In this case, Holt-Oram syndrome was readily diagnosed by prenatal sonography.

Abnormalities, Multiple↗
PubMed2000

Prenatal ultrasound of regional akinesia with Pena-Shokier phenotype.

This report describes sonographic features of the Pena-Shokeir phenotype secondary to regional akinesia at 28 weeks of gestation with maternal perception of good fetal movement. The diagnosis was based on the findings of no fetal activity in some parts of the body (upper limbs, a part of the face, and thorax), with deformation sequence of fixed flexion at wrist, elbow, and shoulder joints, fixed open mouth, fetal growth restriction, lung hypoplasia, polyhydramnios and normal chromosome study. Surprisingly, fetal akinesia involved only the upper limbs, a part of the face, and chest, whereas the lower limbs were completely normal in both morphology and activity. With vibroacoustic stimulation, the response of fetal heart rate acceleration, gross body movement including fetal head, spine and lower limb movement were observed, but the movement of the upper limbs and fetal breathing were completely absent. Spontaneous labour and delivery occurred at 29 weeks' gestation. Postnatal autopsy confirmed the prenatal findings. In conclusion, prenatal sonography plays an important role not only in detecting Pena-Shokeir phenotype but also in providing the detailed pattern of fetal akinesia. Finally, this case reaffirms the concept that function is an integral part of normal development.

Abnormalities, Multiple↗
PubMed2000

Early prenatal sonographic diagnosis of congenital hypophosphatasia.

A pregnant woman of 14 weeks' gestation was sonographically examined due to large-for-dates uterine size. The ultrasound examination showed poor ossification of all bony structures. All limbs were shortened with no evidence of fractures. The echodensity approximated that of the surrounding organs. No acoustic shadowing was observed. Based on these sonographic findings, skeletal dysplasia and short-limb dwarfism were diagnosed, the most likely condition being congenital hypophosphatasia. Early cordocentesis was successfully performed at 15 weeks' gestation to determine fetal alkaline phosphatase concentration. This was undetectable. The prenatal diagnosis of congenital hypophosphatasia was made. After counselling, the woman decided to opt for termination of pregnancy which was performed vaginally. Post-abortion findings confirmed the prenatal diagnosis. To our knowledge, this is the earliest sonographic diagnosis of this condition reported.

Adult↗
PubMed2000

Prenatal diagnosis of thrombocytopenia-absent-radius (TAR) syndrome.

The prenatal diagnosis of thrombocytopenia-absent-radius (TAR) syndrome using ultrasound and cordocentesis in the 16th week of gestation is established. The sonographic findings detected in this case included bilateral absence of the radius and club hands with normal thumbs and metacarpals. Because of a high index of suspicion for the syndrome, cordocentesis for fetal blood analysis was performed. Thrombocytopenia, with a platelet count of 14,000/mm3, was identified. The pregnancy was electively terminated and subsequent findings confirmed the sonographic diagnosis. This report, to our knowledge, is one of a very limited number of cases published in the literature, in which the prenatal diagnosis of TAR syndrome was made.

Abortion, Therapeutic↗
PubMed2000

Prenatal diagnosis of campomelic dysplasia.

A pregnant woman of 24 weeks' gestation underwent ultrasound examination for fetal anomaly screening. The ultrasound findings revealed a single fetus with biparietal diameter of 61 mm, which was consistent with menstrual dates. The thoracic cage was small compared to the abdomen with hypoplastic scapulae and normally ossified unfractured ribs. All bony structures demonstrated normal echogenicity. The upper long bones were normal length and shape. Both femurs and tibiae were obviously bowed anteriorly, and slightly shortened. Bilateral talipes equinovarus were clearly demonstrated. A prenatal diagnosis of campomelic dysplasia was made and was confirmed by postnatal radiography and autopsy. The sonographic diagnosis in this case was based on the findings of small thorax, hypoplastic scapulae and bowed tibiae and femurs.

Abnormalities, Multiple↗
PubMed2000

Sonographic diagnosis of exencephaly: omphalocele at 11 weeks of gestation.

This report presents a sonographic diagnosis of exencephaly combined with omphalocele at 11 weeks of gestation. The transvaginal ultrasound showed frog-eye appearance face with no skull, abnormal shape of disorganized brain with covering membrane separated from brain mass by anechoic fluid in some area, and omphalocele of 8 mm diameter. Therapeutic abortion was successfully done with misoprostol. Postabortal macroscopic findings confirmed the prenatal diagnosis. The combination of exencephaly and omphalocele is rare, and this is one of the earliest diagnosis of not only exencephaly but also omphalocele. To our best knowledge, this represents the earliest diagnosis of the combination. In conclusion, transvaginal ultrasound proved highly informative for both exencephaly and omphalocele as early as in first trimester.

Abortion, Therapeutic↗
PubMed2000

Cordocentesis at 16-24 weeks of gestation: experience of 1,320 cases.

The objective of this study was to assess the safety and efficacy of diagnostic cordocentesis at midpregnancy. 1,320 singleton pregnancies with no obvious congenital anomalies, a gestational age of 16-24 weeks, and proper indications underwent cordocentesis using the freehand technique. The results of each procedure was prospectively collected and subsequently analysed for the results and pregnancy outcomes. The mean maternal age was 31.1 years and the mean gestational age at the time of cordocentesis was 19.8 weeks. The most common indication was the risk of severe thalassaemia syndrome (69.8%) and was followed by rapid karyotyping. Of 1,320 cordocenteses, 1,281 (97%) were done successfully at the first attempt. The mean duration of the procedure was 10.5 min and was significantly longer in the first 50 cases of practice for each operator. The maternal blood contamination rate was higher when the cord insertion was targeted. The procedure-related complications included transient bleeding at puncture site (20.2%), transient fetal bradycardia (4. 3%), chorioamnionitis (two cases), and cord haematoma (one case). Of 1,281 successful cases, 184 fetuses had severe disease. The total fetal loss rate was 3.2% and the procedure-related loss was 1%. The other obstetric complications were comparable with those in the general population. We conclude that cordocentesis at midpregnancy is a useful, relatively safe, and effective procedure for prenatal diagnosis.

Abortion, Spontaneous↗
PubMed2000

Prenatal control of severe thalassaemia: Chiang Mai strategy.

Prenatal diagnosis of severe thalassaemia is conventionally diagnosed by fetal DNA analysis but it can not be widely used due to its drawbacks of high cost and technical effort. This prospective study describes a new prenatal strategy in preventing severe thalassaemia by a more simple and inexpensive way. The strategy included: (1) genetic counselling; (2) identification of pregnancies at risk by retrospective screening (history of known risk) and prospective screening for asymptomatic women; (3) cordocentesis at 16-22 weeks' gestation; (4) fetal blood analysis with high performance liquid chromatography (HPLC); (5) termination of affected pregnancy. The prospective screening consisted of 2 min osmotic fragility (OF) and HbE screening test in women with no risk, and testing the husbands of the women with a positive result. If both of the couple had a positive result, the diagnostic test (HbA(2) level and PCR alpha-thal 1) for the carrier was needed. A pregnancy in which both of the couple were carriers was considered at risk. This strategy identified 181 and 108 couples at risk by prospective (from 7954 pregnancies) and retrospective screening, respectively. Two hundred and forty-two underwent cordocentesis, 108 from retrospective screening and 134 from prospective screening, and 62 were proven to have severe thalassaemia (29 and 33 in retrospective and prospective screening, respectively). The strategy identified nearly all, if not all, fetuses with severe thalassaemia without false positives among the screened couples. In conclusion, the strategy proves to be highly effective in the control of severe thalassaemia.

Abortion, Therapeutic↗
PubMed2000

Prenatal diagnosis: 10-year experience.

To evaluate the indications and results of prenatal diagnosis of the high risk pregnant women attending the antenatal care clinic at Maharaj Nakorn Chiang Mai Hospital, Chiang Mai University during 1988-1998, we analysed 2,315 amniocenteses, 1,000 cordocenteses, and 11,895 obstetric ultrasound examinations. Among the amniocentesis group, 2,017 cases (87%) were done with the indication of advanced maternal age. The prevalence of major abnormal fetal chromosomes among high risk pregnancies was 1:58. Of 1,000 cases with cordocentesis, the most common indication was fetal risk of severe thalassemia (658 cases; 65.8%) and followed by fetal risk of chromosome abnormalities (272 cases; 27.2%). In the group of cordocentesis for diagnosis of thalassemia, 99 and 49 pregnancies were affected with Hb Bart's disease and homozygous beta-thalassemia, respectively. Thirty three cases with indication of chromosome analysis had fetuses with abnormal chromosomes. The major indications of ultrasonography included suspicion of intrauterine growth restriction (IUGR), determination of gestational age and screening anomalies, respectively. In conclusion, our extensive experience has enabled us to prenatally detect most fetuses with severe thalassemia, and fetuses with abnormal chromosomes as well as anomalies in a significant number, contributing a great deal to our population. Therefore, we recommend that systematic prenatal diagnosis, either amniocentesis, cordocentesis or ultrasound should be provided to every high risk pregnant woman for a healthy newborn.

Adult↗
PubMed1999

Prenatal sonographic diagnosis of VATER association.

PURPOSE: We examined the potential role of sonography in the prenatal diagnosis of the VATER association, a spectrum of fetal anomalies that includes vertebral defects, imperforate anus, tracheoesophageal fistula, and radial and renal dysplasia. METHODS: The sonographic findings in 4 fetuses with prenatal diagnoses of VATER association were prospectively recorded, along with information on outcome and postnatal radiographic findings. RESULTS: VATER association was diagnosed in 4 fetuses at 20, 17, 21, and 29 weeks' menstrual age. All showed bilateral radial atresia and tracheoesophageal fistula, visible sonographically as a collapsed or absent stomach with polyhydramnios. Two fetuses had vertebral defects. Postnatal radiographic and macroscopic findings confirmed the prenatal diagnosis in all cases. Other associated anomalies detected prenatally included single umbilical arteries (2 cases), ventricular septal defect (1 case), and renal abnormalities (2 cases). Anal atresia, present in 3 of the 4 fetuses, was not detected prenatally. CONCLUSIONS: This small series suggests that the VATER association can be readily diagnosed in utero. Important clues include radial atresia, absent or collapsed stomach, and polyhydramnios. Prenatal diagnosis can contribute to clinical decisions regarding pregnancy and neonatal management.

Abnormalities, Multiple↗