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Master's Dissertation
DOI
10.11606/D.5.2009.tde-08032010-160711
Document
Author
Full name
Carolina Hofmeister de Andrade Mansú
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2009
Supervisor
Committee
Brizot, Maria de Lourdes (President)
Duarte, Geraldo
Liao, Adolfo Wenjaw
Title in Portuguese
Predição do parto prematuro espontâneo em gestações gemelares pela medida do colo uterino: comparação entre medida obtida entre 18-21 semanas e 22-25 semanas de gestação e análise do encurtamento cervical
Keywords in Portuguese
Colo do útero/crescimento e desenvolvimento
Gravidez múltipla
Medida do comprimento cervical
Trabalho de parto prematuro
Ultrasonografia pré-natal
Abstract in Portuguese
OBJETIVO: O objetivo do presente estudo é comparar o poder da medida do comprimento do colo uterino quando obtida no período de 18-21 semanas com a obtida no período de 22-25 semanas de gestação na predição do parto prematuro espontâneo em gestações gemelares e analisar o valor do encurtamento cervical observado entre essas duas medidas. MÉTODO: estudo retrospecto envolvendo 383 gestantes gemelares que foram avaliadas entre a 18ª e a 21ª semanas (GRUPO 1- 241 pacientes) e a 22ª e a 25ª semanas de gestação (GRUPO 2- 266 pacientes). Esses dois períodos foram avaliados de maneira independente e as pacientes foram incluídas em um deles ou em ambos, com ao menos 3 semanas entre os exames. Pacientes incluídas nos dois períodos (GRUPO 3- 124 pacientes) permitiram a análise do encurtamento cervical. Não foram incluídas gestações com as seguintes complicações: síndrome da transfusão feto-fetal, poliidrâmnio, malformação fetal, patologia uterina, gestações submetidas a procedimento invasivo, cerclagem uterina, parto prematuro eletivo e os casos em que não foi possível obter o desfecho da gestação. O parâmetro avaliado foi o comprimento do colo. Curvas ROC foram usadas para comparar a capacidade de predição do parto prematuro. Na determinação de sensibilidade, especificidade, VPP e VPN foi usado como ponto de corte o 5º percentil do comprimento do colo determinado por Fujita et al (2002) em nossa população. RESULTADO: GRUPO 1- o comprimento médio do colo com 19,5 semanas (IG média no grupo) foi 38,2 ±8,7 mm. A taxa de PPE (parto prematuro espontâneo) abaixo de 28, 30, 32 e 34 semanas de gestação foi 3,7%, 6,2%, 7,8% e 16,1%, respectivamente. A incidência de colo curto foi (14/241) 5,8%. Análise da curva ROC revelou área sob a curva de 0,64 (CI95% 0,53-0,75). Sensibilidade de 33,3%, 33,3%, 30% e 23% e VPN de 97,3%, 95,6%, 93,8% e 86,8% para parto abaixo de 28, 30, 32, e 34 semanas de gestação foram obtidos. GRUPO 2- o comprimento médio do colo com 23,3 semanas (IG média no grupo) foi 35,6 ±10,5 mm. A taxa de PPE abaixo de 28, 30, 32 e 34 semanas de gestação foi 2,6%, 5,2%, 7,1% e 12,8%, respectivamente. A incidência de colo curto foi (22/266) 8,2%. Análise da curva ROC revelou área sob a curva de 0,80 (CI95% 0,72-0,88), e essa área é maior do que a do GRUPO 1 (p0,001). Sensibilidade de 71,4%, 57,1%, 52,6% e 38,2% e VPN de 99,1%, 97,5%, 96,3% e 91,4% para parto abaixo de 28, 30, 32, e 34 semanas de gestação foram obtidos. GRUPO 3- Análise da curva ROC revelou área sob a curva de 0,81 (CI95% 0,73-0,89). O melhor ponto de corte para encurtamento cervical foi dado pelo joelho de curva e foi 2 mm/semana. Sensibilidade de 80%, 90%, 78,5% e 60,8% e VPN de 98,9%, 98,9%, 96,8% e 90,6% para parto abaixo de 28, 30, 32, e 34 semanas de gestação. CONCLUSÃO: nas gestações gemelares, a medida do colo uterino entre 22-25 semanas de gestação é melhor preditora do parto prematuro abaixo de 34 semanas do que a medida obtida entre 18-21 semanas. O encurtamento cervical 6mm/3 semanas entre 18 e 25 semanas de gestação é bom preditor de parto prematuro em subgrupo de alto risco.
Title in English
Prediction of spontaneous preterm birth in twin pregnancies by cervical length measurement: comparison between assessment at 18- 21 weeks and 22-25 weeks gestation and analyses of cervical shortening
Keywords in English
Cervical length measurement
Cervix uteri/growth & development
Obstetric labor
Pregnancy multiple
Premature
Prenatal
Ultrasonography
Abstract in English
OBJECTIVE: The aim of the present study is to compare the value of cervical assessment in twin pregnancies in predicting risk of spontaneous preterm delivery when performed at 18-21 weeks and 22-25 weeks gestation and to examine the value of cervical shortening observed between both periods. METHODS: This retrospective study involved 383 women carrying twins who were scheduled between 18-21 completed weeks (GROUP 1- 241 patients) and 22-25 completed weeks of gestation (GROUP 2- 266 patients). These two periods were assessed independently, and patients could be included in one or both with at least three weeks between the exams, whose delivery data was obtained. Patients included in both periods (GROUP 3- 124 patients) allowed the analysis of cervical shortening. Pregnancies presenting with the following complications where not included in the analyses: twin-twin transfusion syndrome, polihidramnius, fetal malformation, uterine patology; cases that underwent invasive procedures or uterine cerclage, premature delivery indicated for maternal or fetal complications and cases in which pregnancy outcome was impossible to obtain. Cervical length was the analyzed parameter. Area under the ROC curve was used to compare the predictive capacity of spontaneous preterm birth. To determine sensitivity, specificity, PPV and NPV, cervical length cut-off for short cervix was determined by Fujita et al (2002) curve, designed in our population. RESULTS: GROUP 1- The mean cervical length at 19.5 weeks (mean gestational age in the group) was 38.2 +- 8.7 mm. The rate of spontaneous preterm delivery (SPD) < 28, <30, <32 and < 34 weeks of gestation was 3.7%, 6.2%, 7.8% and 16.1%, respectively. The incidence of short cervix in the group was (14/241) 5.8%. Receiver operating characteristic curve analysis revealed area under the curve 0.64 (CI95% 0.53-0.75). Sensitivities of 33.3%, 33.3%, 30% and 23% and negative predictive values of 97.3%, 95.6%, 93.8% and 86.8% for delivery at <28, <30, <32, and <34 weeks gestation were achieved. GROUP 2- The mean cervical length at 23.3 weeks (mean gestational age in the group) was 35.6 +- 10.5 mm. The rate of SPD < 28, <30, <32 and < 34 weeks of gestation was 2.6%, 5.2%, 7.1% and 12.8%, respectively. The incidence of short cervix was (22/266) 8.2%. Receiver operating characteristic curve analysis revealed area under the curve 0.80 (CI95% 0.72-0.88), and this is larger than GROUP 1 area (p0,001). Sensitivities of 71.4%, 57.1%, 52.6% and 38.2% and negative predictive values of 99.1%, 97.5%, 96.3% and 91.4% for delivery at <28, <30, <32, and <34 weeks gestation were achieved. GROUP 3- Receiver operating characteristic curve analysis revealed area under the curve 0.81 (CI95% 0.73-0.89). The best cut-off for cervical shortening was reveled by the inflection point of the curve and was 2 mm/week. Sensitivities of 80%, 90%, 78.5% and 60.8% and negative predictive values of 98.9%, 98.9%, 96.8% and 90.6% for delivery at <28, <30, <32, and <34 weeks gestation were achieved. CONCLUSION: In twin gestations, assessment of cervical length at 22-25 weeks is better than __________________________________________________________________ assessment at 18-21 weeks to predict preterm delivery before 34 weeks. Cervical shortening of 6 mm/ 3weeks between 18 and 25 weeks gestation was a good predictor of spontaneous preterm birth in high risk population.
 
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Publishing Date
2010-03-15
 
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