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Doctoral Thesis
DOI
10.11606/T.7.2011.tde-24012012-111043
Document
Author
Full name
Flora Maria Barbosa da Silva
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2011
Supervisor
Committee
Oliveira, Sonia Maria Junqueira Vasconcellos de (President)
Bick, Debra Elizabeth
Diniz, Carmen Simone Grilo
Osava, Ruth Hitomi
Riesco, Maria Luiza Gonzalez
Title in Portuguese
Transferências maternas de uma casa de parto para o hospital: estudo caso-controle
Keywords in Portuguese
centros independentes de assistência à gravidez e ao parto
enfermagem obstétrica
estudos de casos e controles.
parto
parto normal
Abstract in Portuguese
Centros de parto normal (CPN) têm como finalidade a assistência à mulher no parto normal sem complicações. Podem ter localização intra-hospitalar, peri-hospitalar ou extra-hospitalar (autônomo). Os objetivos foram: identificar os fatores de risco para transferência materna de um CPN para o hospital; elaborar um modelo de risco para transferência intraparto baseado nos fatores identificados e analisar os desfechos maternos e neonatais das transferências. Estudo do tipo caso-controle, com coleta de dados retrospectiva, em um centro de parto extra-hospitalar (Casa do Parto de Sapopemba - CPS) e no Hospital Estadual de Vila Alpina (HEVA), na cidade de São Paulo. Os casos foram todas as mulheres transferidas da CPS para o HEVA, de março de 2002 a dezembro de 2009. Os controles foram mulheres não transferidas que deram à luz na CPS no mesmo período, selecionadas aleatoriamente, sendo quatro controles para cada caso. Os fatores de risco para transferências maternas intraparto foram analisados primeiro pelo teste Qui-Quadrado. Na análise múltipla, incluíram-se as variáveis com p<0,20. Elaborou-se a seguir o modelo de regressão logística múltiplo pelo processo stepwise forward selection; variáveis com p<0,05 foram fatores independentes associados às transferências maternas. Transferências maternas pós-parto tiveram análise descritiva, em razão do reduzido número (13). Variáveis identificadas como fatores de risco independentes para transferência intraparto: nuliparidade (OR 5,6; IC 95% 2,9-10,9), idade materna 35 anos (OR 5,0; IC 95% 2,0-12,7), não ter companheiro (OR 2,7; IC 95% 1,4-5,1), ser admitida na CPS com cervicodilatação 3 cm (OR 2,0; IC 95% 1,1-3,4), realizar 5-12 consultas na CPS (OR 3,3; IC 95% 1,6-6,7) e peso do RN de 4.000-4.600 g (OR 3,5; IC 95% 1,1-11,2). Adequação entre altura uterina e idade gestacional baixa (OR 0,3; IC 95% 0,2-0,6) foi fator de proteção para a transferência. Apresentou-se modelo de risco para transferência intraparto, com probabilidade de transferência estimada de acordo com as variáveis identificadas como fatores de risco. Nos desfechos das transferências maternas: taxa de transferência intraparto: 4,1%; pós-parto: 0,5%; não houve óbitos entre as mulheres que deram à luz na CPS ou no HEVA e entre os RN da CPS; houve óbito de dois RN do HEVA (taxa de mortalidade perinatal: 0,73/1.000 nascidos vivos). Causas de transferência intraparto: maternas (57,6% falha no progresso do trabalho de parto); fetais (28% líquido amniótico meconial e traçado cardiotocográfico alterado); outras (14,4%); via de parto das mulheres transferidas: 49,5% parto normal; 44,1% cesariana; 4,5% fórceps e 1,8% vácuo extrator. Entre os RN de mães transferidas: 25,2% e 4,5% tiveram Apgar <7 nos 1º e 5º minutos, respectivamente; unidade de internação: 10,8% na UTI neonatal, 9,0% unidade de cuidados intermediários, 0,9% setor de observação e 79,3% alojamento conjunto. Causas de transferência no pós-parto: retenção placentária (38,5%); outros problemas (30,8%); sangramento vaginal aumentado (15,4%) e febre materna (15,4%); 46,1% necessitaram de curetagem e 38,4% de transfusão sanguínea. Concluiu-se que identificar os fatores de risco para transferência materna contribui para refinar os critérios de admissão de mulheres atendidas em CPN, ao auxiliar na identificação de casos que podem resultar em complicações.
Title in English
Maternal transfers from a freestanding birth center to the hospital: a case control study
Keywords in English
Birthing centers
case control studies.
natural childbirth
obstetrical nursing
parturition
Abstract in English
Birth centers (BC) aim to provide care to women in normal birth without complications. They may have in-hospital, alongside or freestanding (autonomous) locations. The objectives were to identify risk factors for maternal transfer from a BC to the hospital, to develop a risk model for intrapartum transfers using the identified factors and to analyze the maternal and neonatal outcomes of transfers. It was a case-control study, with retrospective data collection in a freestanding birth center (Sapopemba Birth Center - SBP) and the State Hospital Vila Alpina (HEVA), in São Paulo. The cases were all women transferred from SBP to HEVA, from March 2002 to December 2009. The controls were not transferred women who gave birth in CPS in the same period, randomly selected, four controls for each case. Risk factors for maternal intrapartum transfers were primarily analized by the Chi-square test. In the multivariate analysis, the variables with p <0.20 were included. The multiple logistic regression model was build by stepwise forward selection process; variables with p <0.05 were factors independently associated with maternal transfers. Postpartum maternal transfers had descriptive analysis, due to the small number (13). Variables identified as independent risk factors for intrapartum transfer: nulliparity (OR 5.6, 95% CI 2.9 to 10.9), maternal age 35 years (OR 5.0, 95% CI 2.0 to 12. 7), no partner (OR 2.7, 95% CI 1.4 to 5.1), admission to the CPS with cervical dilation 3 cm (OR 2.0, 95% CI 1.1-3.4), number of appointments on SBC 5-12 CPS (OR 3.3, 95% CI 1.6 to 6.7) and newborn weight 4000-4600 g (OR 3.5, 95% CI 1.1 to 11.2). The low result for fitting uterine height and gestational age (OR 0.3, 95% CI 0.2-0.6) was a protective factor for transfer. A model of risk for intrapartum transfer was presented, to estimate the probability of transfer according to the variables identified as risk factors. The outcomes of maternal transfers were: intrapartum transfer rate: 4.1%; postpartum transfer rate: 0.5%; there were no deaths among women who gave birth in SBC or HEVA or between the newborns who were born on SBC; there were two deaths of newborns born in HEVA (perinatal mortality rate: 0.73 / 1,000 live births). Causes of intrapartum transfer: maternal (57.6% failure to progress in labor), fetal (28% meconium stained amniotic fluid and cardiotocographic trace changes), others (14.4%); mode of delivery of the transferred women: 49, 5% normal delivery, cesarean section 44.1%, 4.5% forceps and 1.8% vacuum extractor. Among infants of mothers transferred: 25.2% and 4.5% had Apgar score <7 at 1st and 5th minutes, respectively; unit admission of newborns: 10.8% in the neonatal intensive care unity, 9.0% intermediate care unit, 0, 9% observation rooms and 79.3% rooming-in unity. Causes of postpartum transfer: retained placenta (38.5%), other problems (30.8%), increased vaginal bleeding (15.4%) and maternal fever (15.4%); 46.1% required curettage and 38.4% blood transfusion. It was concluded that identifying risk factors for maternal transfer contributes to refine the criteria for admission of women attending BC, as it can be useful in identifying cases that may lead to complications.
 
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Doutorado_Flora.pdf (9.57 Mbytes)
Publishing Date
2012-01-26
 
WARNING: The material described below relates to works resulting from this thesis or dissertation. The contents of these works are the author's responsibility.
  • SILVA, Flora, et al. Factors associated with maternal intrapartum transfers from a freestanding birth centre in São Paulo : Brazil: a case control study [doi:10.1016/j.midw.2012.07.012]. Midwifery [online], 2012. Early View (in press).
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