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Papers by Carlos Yoshizaki

Research paper thumbnail of Progesterona para prevenção do parto prematuro; Progesterone for prevention of preterm delivery

Resumo Esta revisão, baseada em evidências, pretendeu analisar a utilização da progesterona na pr... more Resumo Esta revisão, baseada em evidências, pretendeu analisar a utilização da progesterona na prevenção do parto prematuro. Foram apresentados os principais ensaios clínicos randomizados em gestações únicas ou gemelares que utilizaram a progesterona sintética por via intramuscular ou a progesterona natural pela via vaginal ou oral em gestações de risco para a prematuridade espontânea. Concluímos que há benefícios quanto ao uso da progesterona sintética e natural para prevenir o parto prematuro em gestações únicas com antecedente de prematuridade espontânea e no colo curto.

Research paper thumbnail of Dados epidemiologicos do leiomioma uterino

Rev Ginecol Obstet, Mar 1, 2000

Research paper thumbnail of P27.05: Quantification of renal vascularity by 3D-power Doppler ultrasonography in normal fetuses

Ultrasound in Obstetrics & Gynecology, 2012

Research paper thumbnail of Avaliação do volume e dos índices de vascularização dos rins fetais por meio da ultrassonografia tridimensional: proposta de valores de referência

Research paper thumbnail of Renal volumes measured by 3-dimensional sonography in healthy fetuses from 20 to 40 weeks

Journal of Ultrasound in Medicine Official Journal of the American Institute of Ultrasound in Medicine, Mar 1, 2013

Research paper thumbnail of Renal volumes measured by 3-dimensional sonography in healthy fetuses from 20 to 40 weeks

Journal of ultrasound in medicine : official journal of the American Institute of Ultrasound in Medicine, 2013

The purpose of this study was to establish reference values for fetal kidney volumes as a functio... more The purpose of this study was to establish reference values for fetal kidney volumes as a function of gestational age, estimated by 3-dimensional sonography using the Virtual Organ Computer-Aided Analysis (VOCAL) technique (GE Healthcare, Kretztechnik, Zipf, Austria). Volumes of right and left kidneys were assessed in 213 healthy fetuses by 3-dimensional sonography using the VOCAL technique. Inclusion criteria were healthy women with singleton pregnancies, unremarkable comprehensive fetal sonographic findings, well-known gestational age established by first-trimester sonography, and gestational ages between 20 and 40 weeks. Exclusion criteria were patients lost to follow-up and birth weight abnormalities. Each patient was scanned once during pregnancy. Regression analysis was used to calculate unified formulas. The mathematical models calculated in the study were as follows: expected right kidney volume = exp[-1.01 + (0.12 × gestational age)]; and expected left kidney volume = exp[-...

Research paper thumbnail of Rastreamento Antenatal da Síndrome de Down Utilizando Parâmetros Ultra-sonográficos

Revista Brasileira de Ginecologia e Obstetrícia, 2002

Page 1. 601 RBGO - v. 24, nº 9, 2002 RESUMO Objetivo: avaliar o valor de parâmetros ultra-sonográ... more Page 1. 601 RBGO - v. 24, nº 9, 2002 RESUMO Objetivo: avaliar o valor de parâmetros ultra-sonográficos para o diagnóstico da síndrome de Down fetal (T21), com a finalidade de permitir sua aplicação na prática clínica rotineira. ...

Research paper thumbnail of Prenatal diagnosis and perinatal outcome of 38 cases with congenital diaphragmatic hernia: 8-year experience of a tertiary Brazilian center

Clinics, 2006

diagnosis and perinatal outcome of 38 cases with congenital diaphragmatic hernia: 8-year experien... more diagnosis and perinatal outcome of 38 cases with congenital diaphragmatic hernia: 8-year experience of a tertiary Brazilian center. Clinics. 2006;61(3):197-202.

Research paper thumbnail of Fetal cystoscopic placement of transurethral stent in a fetus with urethral stenosis

Ultrasound in Obstetrics & Gynecology, 2013

We report the case of a fetus with severe megabladder, displaying the 'keyhole&am... more We report the case of a fetus with severe megabladder, displaying the 'keyhole' sign on ultrasound imaging, that underwent cystoscopy at 22 weeks' gestation. There was a familial history of mild urethral atresia. Fetal cystoscopy revealed congenital urethral atresia. A guide wire was advanced through the fetal urethra and a transurethral vesicoamniotic stent was placed successfully. The fetus was delivered at 36 weeks' gestation and postnatal cystoscopy confirmed the absence of posterior urethral valves or urethral atresia. The infant was 5 years old with normal renal function at the time of writing. We conclude that fetal cystoscopic placement of a transurethral stent for congenital urethral stenosis is feasible.

Research paper thumbnail of Fetal obstructive uropathy: is urine sampling useful for prenatal counselling?

Prenatal Diagnosis, 2006

To evaluate whether fetal urinary sodium and chloride provide clinically useful information in ad... more To evaluate whether fetal urinary sodium and chloride provide clinically useful information in addition to ultrasound in bilateral obstructive uropathy. Sonographic features and urinary concentrations of sodium and chloride were evaluated in fetuses with bilateral obstructive uropathy. After a minimum of 12 months of postnatal follow-up, cases that developed increased serum creatinine (greater than 50 micromol/L) were compared with those that did not. Of the cases studied, 16/35 died perinatally, all showing anamnios and markedly elevated urinary electrolytes. Of the survivors, ten maintained normal postnatal serum creatinine, whereas nine did not. The frequency of reduced amniotic fluid/olygohydramnios was higher in cases that developed increased serum creatinine (four out of nine) than in those that did not (nil). Sodium above the 95th percentile was 100% specific and 44% sensitive to predict an increased serum creatinine during early infancy, while chloride above the 95th percentile was 70% specific and 56% sensitive. All seven cases in which urinary sodium was elevated and/or amniotic fluid volume was reduced developed renal failure. Urine sampling slightly improved renal function prediction, but this must be balanced against its fetal risks.

Research paper thumbnail of Prediction of successful labor induction using transvaginal sonographic cervical measurements

Journal of Clinical Ultrasound, 2013

To predict the success of labor induction by sonographic cervical measurements, maternal/obstetri... more To predict the success of labor induction by sonographic cervical measurements, maternal/obstetrical factors, and the Bishop's score. Between February 2008 and February 2010, 190 consecutive pregnant women underwent clinical examination to assess the Bishop's score and transvaginal sonographic cervical measurements (cervical length, fetal head stage, and cervical dilatation) before labor induction. The following outcomes were analyzed: overall vaginal delivery and vaginal delivery up to 24 hours after labor induction. Overall vaginal delivery occurred in 133 (70.0%) patients and vaginal delivery 24 hours after labor induction happened in 119 (62.6%) patients. The sonographic cervical measurements were significantly associated with all outcomes (p < 0.01). The areas under the ROC curve (AUC) of all ultrasound cervical parameters to predict the two events were 68.9% and 72.0% (cervical length); 71.6% and 73.6% (fetal head stage); and 72.0% and 73.4% (cervical dilatation). Mathematical equations were obtained to calculate the probability for each event considering the sonographic cervical measurements in association with clinical factors after regression analysis, which increased the AUC for both events (80.1% and 79.3%). Transvaginal sonographic cervical measurements can predict the successful labor induction, especially when associated to clinical analysis (Bishop's score).

Research paper thumbnail of Fetal nasal bone length: reference range and clinical application in ultrasound screening for trisomy 21

Ultrasound in Obstetrics and Gynecology, 2003

Objectives Fetuses with trisomy 21 typically present with subtle facial abnormalities, including ... more Objectives Fetuses with trisomy 21 typically present with subtle facial abnormalities, including a hypoplastic nasal bone. The aim of this study was to provide a reference range for the length of the fetal nasal bone and to test its value in second-trimester ultrasound screening for trisomy 21.

Research paper thumbnail of Progesterona para prevenção do parto prematuro; Progesterone for prevention of preterm delivery

Resumo Esta revisão, baseada em evidências, pretendeu analisar a utilização da progesterona na pr... more Resumo Esta revisão, baseada em evidências, pretendeu analisar a utilização da progesterona na prevenção do parto prematuro. Foram apresentados os principais ensaios clínicos randomizados em gestações únicas ou gemelares que utilizaram a progesterona sintética por via intramuscular ou a progesterona natural pela via vaginal ou oral em gestações de risco para a prematuridade espontânea. Concluímos que há benefícios quanto ao uso da progesterona sintética e natural para prevenir o parto prematuro em gestações únicas com antecedente de prematuridade espontânea e no colo curto.

Research paper thumbnail of Dados epidemiologicos do leiomioma uterino

Rev Ginecol Obstet, Mar 1, 2000

Research paper thumbnail of P27.05: Quantification of renal vascularity by 3D-power Doppler ultrasonography in normal fetuses

Ultrasound in Obstetrics & Gynecology, 2012

Research paper thumbnail of Avaliação do volume e dos índices de vascularização dos rins fetais por meio da ultrassonografia tridimensional: proposta de valores de referência

Research paper thumbnail of Renal volumes measured by 3-dimensional sonography in healthy fetuses from 20 to 40 weeks

Journal of Ultrasound in Medicine Official Journal of the American Institute of Ultrasound in Medicine, Mar 1, 2013

Research paper thumbnail of Renal volumes measured by 3-dimensional sonography in healthy fetuses from 20 to 40 weeks

Journal of ultrasound in medicine : official journal of the American Institute of Ultrasound in Medicine, 2013

The purpose of this study was to establish reference values for fetal kidney volumes as a functio... more The purpose of this study was to establish reference values for fetal kidney volumes as a function of gestational age, estimated by 3-dimensional sonography using the Virtual Organ Computer-Aided Analysis (VOCAL) technique (GE Healthcare, Kretztechnik, Zipf, Austria). Volumes of right and left kidneys were assessed in 213 healthy fetuses by 3-dimensional sonography using the VOCAL technique. Inclusion criteria were healthy women with singleton pregnancies, unremarkable comprehensive fetal sonographic findings, well-known gestational age established by first-trimester sonography, and gestational ages between 20 and 40 weeks. Exclusion criteria were patients lost to follow-up and birth weight abnormalities. Each patient was scanned once during pregnancy. Regression analysis was used to calculate unified formulas. The mathematical models calculated in the study were as follows: expected right kidney volume = exp[-1.01 + (0.12 × gestational age)]; and expected left kidney volume = exp[-...

Research paper thumbnail of Rastreamento Antenatal da Síndrome de Down Utilizando Parâmetros Ultra-sonográficos

Revista Brasileira de Ginecologia e Obstetrícia, 2002

Page 1. 601 RBGO - v. 24, nº 9, 2002 RESUMO Objetivo: avaliar o valor de parâmetros ultra-sonográ... more Page 1. 601 RBGO - v. 24, nº 9, 2002 RESUMO Objetivo: avaliar o valor de parâmetros ultra-sonográficos para o diagnóstico da síndrome de Down fetal (T21), com a finalidade de permitir sua aplicação na prática clínica rotineira. ...

Research paper thumbnail of Prenatal diagnosis and perinatal outcome of 38 cases with congenital diaphragmatic hernia: 8-year experience of a tertiary Brazilian center

Clinics, 2006

diagnosis and perinatal outcome of 38 cases with congenital diaphragmatic hernia: 8-year experien... more diagnosis and perinatal outcome of 38 cases with congenital diaphragmatic hernia: 8-year experience of a tertiary Brazilian center. Clinics. 2006;61(3):197-202.

Research paper thumbnail of Fetal cystoscopic placement of transurethral stent in a fetus with urethral stenosis

Ultrasound in Obstetrics & Gynecology, 2013

We report the case of a fetus with severe megabladder, displaying the 'keyhole&am... more We report the case of a fetus with severe megabladder, displaying the 'keyhole' sign on ultrasound imaging, that underwent cystoscopy at 22 weeks' gestation. There was a familial history of mild urethral atresia. Fetal cystoscopy revealed congenital urethral atresia. A guide wire was advanced through the fetal urethra and a transurethral vesicoamniotic stent was placed successfully. The fetus was delivered at 36 weeks' gestation and postnatal cystoscopy confirmed the absence of posterior urethral valves or urethral atresia. The infant was 5 years old with normal renal function at the time of writing. We conclude that fetal cystoscopic placement of a transurethral stent for congenital urethral stenosis is feasible.

Research paper thumbnail of Fetal obstructive uropathy: is urine sampling useful for prenatal counselling?

Prenatal Diagnosis, 2006

To evaluate whether fetal urinary sodium and chloride provide clinically useful information in ad... more To evaluate whether fetal urinary sodium and chloride provide clinically useful information in addition to ultrasound in bilateral obstructive uropathy. Sonographic features and urinary concentrations of sodium and chloride were evaluated in fetuses with bilateral obstructive uropathy. After a minimum of 12 months of postnatal follow-up, cases that developed increased serum creatinine (greater than 50 micromol/L) were compared with those that did not. Of the cases studied, 16/35 died perinatally, all showing anamnios and markedly elevated urinary electrolytes. Of the survivors, ten maintained normal postnatal serum creatinine, whereas nine did not. The frequency of reduced amniotic fluid/olygohydramnios was higher in cases that developed increased serum creatinine (four out of nine) than in those that did not (nil). Sodium above the 95th percentile was 100% specific and 44% sensitive to predict an increased serum creatinine during early infancy, while chloride above the 95th percentile was 70% specific and 56% sensitive. All seven cases in which urinary sodium was elevated and/or amniotic fluid volume was reduced developed renal failure. Urine sampling slightly improved renal function prediction, but this must be balanced against its fetal risks.

Research paper thumbnail of Prediction of successful labor induction using transvaginal sonographic cervical measurements

Journal of Clinical Ultrasound, 2013

To predict the success of labor induction by sonographic cervical measurements, maternal/obstetri... more To predict the success of labor induction by sonographic cervical measurements, maternal/obstetrical factors, and the Bishop's score. Between February 2008 and February 2010, 190 consecutive pregnant women underwent clinical examination to assess the Bishop's score and transvaginal sonographic cervical measurements (cervical length, fetal head stage, and cervical dilatation) before labor induction. The following outcomes were analyzed: overall vaginal delivery and vaginal delivery up to 24 hours after labor induction. Overall vaginal delivery occurred in 133 (70.0%) patients and vaginal delivery 24 hours after labor induction happened in 119 (62.6%) patients. The sonographic cervical measurements were significantly associated with all outcomes (p < 0.01). The areas under the ROC curve (AUC) of all ultrasound cervical parameters to predict the two events were 68.9% and 72.0% (cervical length); 71.6% and 73.6% (fetal head stage); and 72.0% and 73.4% (cervical dilatation). Mathematical equations were obtained to calculate the probability for each event considering the sonographic cervical measurements in association with clinical factors after regression analysis, which increased the AUC for both events (80.1% and 79.3%). Transvaginal sonographic cervical measurements can predict the successful labor induction, especially when associated to clinical analysis (Bishop's score).

Research paper thumbnail of Fetal nasal bone length: reference range and clinical application in ultrasound screening for trisomy 21

Ultrasound in Obstetrics and Gynecology, 2003

Objectives Fetuses with trisomy 21 typically present with subtle facial abnormalities, including ... more Objectives Fetuses with trisomy 21 typically present with subtle facial abnormalities, including a hypoplastic nasal bone. The aim of this study was to provide a reference range for the length of the fetal nasal bone and to test its value in second-trimester ultrasound screening for trisomy 21.