David Stejskal - Academia.edu (original) (raw)
Papers by David Stejskal
Ultrasound in Obstetrics & Gynecology, 2014
Ultrasound in Obstetrics & Gynecology, 2014
Electronic poster abstracts stored ultrasound images were blinded evaluated by an expert operator... more Electronic poster abstracts stored ultrasound images were blinded evaluated by an expert operator and results were compared. Results: 254 women were performed. 265 fetuses were examined (10 twin pregnancies). Average wg was 12,4 ± 0,4. Visualization of CRL, NT, NB , CC, AC, Upper and Lower Bones, falx cerebri, thalamus, lens, jaw, bone palate, stomach, lungs, upper and lower limb bones, bladder, umbilical arteries, cardiac four chambers (4Cw) and great vessels sections (3Vw) was above 98%(confirmed by expert operators). Discordant % of visualization was found for iNT (95 vs 90), Cerebellum (88%vs72%) brain stem (97%vs88%) Lens (100%vs95%) Diaphragm (99%vs92%) Thymus (14%vs11%). Kidneys (99%vs95%) renal arteries (92%vs55%) TR (96%vs90%) aortic arch (96%vs79%) DV (97%vs88%). Complete concordance between normal and abnormal evaluation was assessed. Conclusions: Ultrasound screening for fetal malformations at 11-13 + 6 wg is feasible even if performed after a brief training. Pitfalls in the visualization of kidneys, ductus venosus flow ant tricuspid regurgitation are frequent.
Fertility and Sterility, 2007
European Journal for Biomedical Informatics, 2011
Objectives: To evaluate and compare the performance of various quality control methods for nuchal... more Objectives: To evaluate and compare the performance of various quality control methods for nuchal translucency (NT) measurements. Methods: Fetal NT measurements performed over a oneyear period in a single center were used for the study. The retrospective quality review methods proposed by the Fetal Medicine Foundation (FMF) and the Woman & Infants Hospital of Rhode Island (WIHRI) were assessed in the whole dataset and in sonographer-specific distributions. Further prospective statistic process control (SPC) methods were applied (Shewhart x and s charts, exponentially weighted moving average (EWMA) and cumulative sum (CUSUM) charts). Results: Three thousand five hundred and seventy eight NT measurements obtained by seven sonographers were eligible for designed analysis. In the assessment of the sonographer-specific NT distributions three of them did not meet due to the underestimation the FMF and one the WIHRI criteria. Using SPC methods, three sonographers presented unsatisfactory performance with underestimation, three sonographers overall satisfactory performance with transient periods of over-and underestimation and one sonographer showed perfect performance.
Ceska gynekologie / Ceska lekarska spolecnost J. Ev. Purkyne
The authors evaluated the risk of chorion biopsy used within the framework of prenatal diagnosis ... more The authors evaluated the risk of chorion biopsy used within the framework of prenatal diagnosis of the foetus. The incidence of abortions following transabdominal CVS (0.6%) did not differ from abortions after amniocentesis in the second trimester (0.5%). In a group of 1002 diagnostic biopsies of the chorion the authors did not record in the born infants reduction deformities of the extremities. Chorion biopsies were performed in 98% between the 10th and 12th week of gestation. The incidence of mosaicism--1.59%--was not significantly higher than reported in the literature. The authors recommend: to increase the size of the sample of chorion tissue by the use of a manual aspirator, the use of a 30 ml plastic syringe or the double needle method. They consider CVS a suitable method which serves the diagnosis of IUGR and the prenatal diagnosis of the foetus before the 20th week of gestation when cordocentesis involves risk.
Ceská gynekologie / Ceská lékarská spolecnost J. Ev. Purkyne, 2008
Analysis of the set of women that underwent the termination of pregnancy in IInd trimester at the... more Analysis of the set of women that underwent the termination of pregnancy in IInd trimester at the OBGYN clinic, Teaching Hospital Na Bulovce at interval of years 2006-2007. We appreciated the effect of method and compared with references in the literature. TYPE STUDY: Retrospective descriptive study. SEATTING: OBGYN clinic of the 1st faculty of Charles University, teaching hospital Na Bulovce, Prague. Retrospective analysis of the set of women that underwent termination of pregnancy in the IInd trimester. Data are obtained from medical documentation and statistically processed. The analysis treats with 50 cases, in all of them, cervix was prepared with hydrophile dilators. In 37 cases were subsequently handed up prostaglandins intraamnially, in two cases generally intravenously, in two cases vaginally and 9 pregnancies were finished directly by dilatation and curettage without endeavour about expulsion. From 37 women after intraamnial administration of prostaglandins, 35 (94.6%) abo...
Ultrasound in Obstetrics & Gynecology, 2014
Letter to the Editor False-negative trisomy 18 non-invasive prenatal test result due to 48,XXX,+1... more Letter to the Editor False-negative trisomy 18 non-invasive prenatal test result due to 48,XXX,+18 placental mosaicism Analysis of cell-free DNA (cfDNA) in maternal plasma by massively parallel sequencing (MPS) has been used recently as a non-invasive prenatal testing (NIPT) approach to detect fetal chromosome aneuploidy with high sensitivity and specificity 1,2. Here we report a rare placental condition of 48,XXX, trisomy 18 mosaic that led to a partially inaccurate NIPT result. The 43-year-old patient (gravida 5 para 2) with uncomplicated spontaneous pregnancy had a Down syndrome risk of 1/70 (first-trimester combined test results: pregnancy-associated plasma protein-A, 0.49 multiples of the median (MoM); free beta human chorionic
Background: We investigated fetal and total DNA levels in maternal plasma in patients bearing fet... more Background: We investigated fetal and total DNA levels in maternal plasma in patients bearing fetuses affected with Down syndrome in comparison to controls carrying fetuses with normal karyotype. Methods: DNA levels in maternal plasma were measured using real-time quantitative PCR using SRY and β-globin genes as markers. Twenty-one pregnant women with a singleton fetus at a gestational age ranging from 15 to 19 weeks recruited before amniocentesis (carried out for reasons including material serum screening and advanced material age), and 16 pregnant women bearing fetuses affected with Down syndrome between 17 to 22 weeks of gestation were involved in the study. Results: The specificity of the system reaches 100% (no Y signal was detected in 14 women pregnant with female fetuses) and the sensitivity 91.7% (SRY amplification in 22 of 24 examined samples). The median fetal DNA levels in women carrying Down syndrome (n=11) and the controls (n=13) were 23.3 (range 0-58.5) genome-equivalents/ml and 24.5 (range 0-47.5) genomeequivalents/ml of maternal plasma, respectively (P = 0.62). The total median DNA levels in pregnancies with Down syndrome and the controls were 10165 (range 615-65000) genomeequivalents/ml and 7330 (range 1300-36750) genome-equivalents/ml, respectively (P = 0.32). The fetal DNA proportion in maternal plasma was 0%-6 % (mean 0.8%) in women carrying Down syndrome and 0%-2.6 % (mean 0.7 %) in the controls, respectively (P=0.86). Conclusions: Our study revealed no difference in fetal DNA levels and fetal DNA: maternal DNA ratio between the patients carrying Down syndrome fetuses and the controls.
European journal of …, 2008
Ultrasound in Obstetrics & Gynecology, 2014
Ultrasound in Obstetrics & Gynecology, 2014
Electronic poster abstracts stored ultrasound images were blinded evaluated by an expert operator... more Electronic poster abstracts stored ultrasound images were blinded evaluated by an expert operator and results were compared. Results: 254 women were performed. 265 fetuses were examined (10 twin pregnancies). Average wg was 12,4 ± 0,4. Visualization of CRL, NT, NB , CC, AC, Upper and Lower Bones, falx cerebri, thalamus, lens, jaw, bone palate, stomach, lungs, upper and lower limb bones, bladder, umbilical arteries, cardiac four chambers (4Cw) and great vessels sections (3Vw) was above 98%(confirmed by expert operators). Discordant % of visualization was found for iNT (95 vs 90), Cerebellum (88%vs72%) brain stem (97%vs88%) Lens (100%vs95%) Diaphragm (99%vs92%) Thymus (14%vs11%). Kidneys (99%vs95%) renal arteries (92%vs55%) TR (96%vs90%) aortic arch (96%vs79%) DV (97%vs88%). Complete concordance between normal and abnormal evaluation was assessed. Conclusions: Ultrasound screening for fetal malformations at 11-13 + 6 wg is feasible even if performed after a brief training. Pitfalls in the visualization of kidneys, ductus venosus flow ant tricuspid regurgitation are frequent.
Fertility and Sterility, 2007
European Journal for Biomedical Informatics, 2011
Objectives: To evaluate and compare the performance of various quality control methods for nuchal... more Objectives: To evaluate and compare the performance of various quality control methods for nuchal translucency (NT) measurements. Methods: Fetal NT measurements performed over a oneyear period in a single center were used for the study. The retrospective quality review methods proposed by the Fetal Medicine Foundation (FMF) and the Woman & Infants Hospital of Rhode Island (WIHRI) were assessed in the whole dataset and in sonographer-specific distributions. Further prospective statistic process control (SPC) methods were applied (Shewhart x and s charts, exponentially weighted moving average (EWMA) and cumulative sum (CUSUM) charts). Results: Three thousand five hundred and seventy eight NT measurements obtained by seven sonographers were eligible for designed analysis. In the assessment of the sonographer-specific NT distributions three of them did not meet due to the underestimation the FMF and one the WIHRI criteria. Using SPC methods, three sonographers presented unsatisfactory performance with underestimation, three sonographers overall satisfactory performance with transient periods of over-and underestimation and one sonographer showed perfect performance.
Ceska gynekologie / Ceska lekarska spolecnost J. Ev. Purkyne
The authors evaluated the risk of chorion biopsy used within the framework of prenatal diagnosis ... more The authors evaluated the risk of chorion biopsy used within the framework of prenatal diagnosis of the foetus. The incidence of abortions following transabdominal CVS (0.6%) did not differ from abortions after amniocentesis in the second trimester (0.5%). In a group of 1002 diagnostic biopsies of the chorion the authors did not record in the born infants reduction deformities of the extremities. Chorion biopsies were performed in 98% between the 10th and 12th week of gestation. The incidence of mosaicism--1.59%--was not significantly higher than reported in the literature. The authors recommend: to increase the size of the sample of chorion tissue by the use of a manual aspirator, the use of a 30 ml plastic syringe or the double needle method. They consider CVS a suitable method which serves the diagnosis of IUGR and the prenatal diagnosis of the foetus before the 20th week of gestation when cordocentesis involves risk.
Ceská gynekologie / Ceská lékarská spolecnost J. Ev. Purkyne, 2008
Analysis of the set of women that underwent the termination of pregnancy in IInd trimester at the... more Analysis of the set of women that underwent the termination of pregnancy in IInd trimester at the OBGYN clinic, Teaching Hospital Na Bulovce at interval of years 2006-2007. We appreciated the effect of method and compared with references in the literature. TYPE STUDY: Retrospective descriptive study. SEATTING: OBGYN clinic of the 1st faculty of Charles University, teaching hospital Na Bulovce, Prague. Retrospective analysis of the set of women that underwent termination of pregnancy in the IInd trimester. Data are obtained from medical documentation and statistically processed. The analysis treats with 50 cases, in all of them, cervix was prepared with hydrophile dilators. In 37 cases were subsequently handed up prostaglandins intraamnially, in two cases generally intravenously, in two cases vaginally and 9 pregnancies were finished directly by dilatation and curettage without endeavour about expulsion. From 37 women after intraamnial administration of prostaglandins, 35 (94.6%) abo...
Ultrasound in Obstetrics & Gynecology, 2014
Letter to the Editor False-negative trisomy 18 non-invasive prenatal test result due to 48,XXX,+1... more Letter to the Editor False-negative trisomy 18 non-invasive prenatal test result due to 48,XXX,+18 placental mosaicism Analysis of cell-free DNA (cfDNA) in maternal plasma by massively parallel sequencing (MPS) has been used recently as a non-invasive prenatal testing (NIPT) approach to detect fetal chromosome aneuploidy with high sensitivity and specificity 1,2. Here we report a rare placental condition of 48,XXX, trisomy 18 mosaic that led to a partially inaccurate NIPT result. The 43-year-old patient (gravida 5 para 2) with uncomplicated spontaneous pregnancy had a Down syndrome risk of 1/70 (first-trimester combined test results: pregnancy-associated plasma protein-A, 0.49 multiples of the median (MoM); free beta human chorionic
Background: We investigated fetal and total DNA levels in maternal plasma in patients bearing fet... more Background: We investigated fetal and total DNA levels in maternal plasma in patients bearing fetuses affected with Down syndrome in comparison to controls carrying fetuses with normal karyotype. Methods: DNA levels in maternal plasma were measured using real-time quantitative PCR using SRY and β-globin genes as markers. Twenty-one pregnant women with a singleton fetus at a gestational age ranging from 15 to 19 weeks recruited before amniocentesis (carried out for reasons including material serum screening and advanced material age), and 16 pregnant women bearing fetuses affected with Down syndrome between 17 to 22 weeks of gestation were involved in the study. Results: The specificity of the system reaches 100% (no Y signal was detected in 14 women pregnant with female fetuses) and the sensitivity 91.7% (SRY amplification in 22 of 24 examined samples). The median fetal DNA levels in women carrying Down syndrome (n=11) and the controls (n=13) were 23.3 (range 0-58.5) genome-equivalents/ml and 24.5 (range 0-47.5) genomeequivalents/ml of maternal plasma, respectively (P = 0.62). The total median DNA levels in pregnancies with Down syndrome and the controls were 10165 (range 615-65000) genomeequivalents/ml and 7330 (range 1300-36750) genome-equivalents/ml, respectively (P = 0.32). The fetal DNA proportion in maternal plasma was 0%-6 % (mean 0.8%) in women carrying Down syndrome and 0%-2.6 % (mean 0.7 %) in the controls, respectively (P=0.86). Conclusions: Our study revealed no difference in fetal DNA levels and fetal DNA: maternal DNA ratio between the patients carrying Down syndrome fetuses and the controls.
European journal of …, 2008