Factores de riesgo asociados a traumatismo al nacimiento / Risk factors associated with birth trauma

ANTECEDENTES: Se define trauma al nacimiento las lesiones sufridas por el feto durante el trabajo de parto o expulsión. OBJETIVO: Identificar los factores de riesgo asociados a lesiones originadas durante el nacimiento en recién nacidos. MÉTODO: Estudio casos y controles, realizado en el período de julio/2004 a diciembre/2005, en la División de Ginecología y Obstetricia del Hospital General de Caxias do Sul/ Facultad de Medicina, Universidad de Caxias do Sul, RS, Brasil. Fueron analizadas variables maternas, del parto y fetales, utilizando el programa estadístico SPSS versión 19.0. Los factores que obtuvieron nivel significativo <0,10 en los análisis bivariado fueron insertas en la regresión logística. Se utilizó el modelo de entrada por bloques (block entry) para selección del modelo final de la regresión. RESULTADOS: En el período citado nacieron 2.137 infantes, 26 de ellos (1,2%) sufrieron trauma al nacimiento. La fractura de clavícula fue la lesión más frecuente (n=14; 53,8%), seguida del cefalohematoma (n=5; 19,2%). Las variables gasométricas no presentaron diferencia estadística. En la regresión logística, las únicas variables independientes asociadas a traumatismo al nacimiento fueron parto vaginal (OR-A: 11,08; IC95%: 2,45-49,98; p=0,002) y perímetro torácico >33 cm (OR-A: 3,36; IC95%: 1,35-9,73; p=0,010). CONCLUSIÓN: Los factores de riesgo asociados a lesiones durante el nacimiento involucran el parto vaginal y el perímetro torácico igual o superior a 33cm.

BACKGROUND: Obstetrics injuries can be defined as fetal lesions suffered by the fetus during labor or expulsion. OBJECTIVE: Identify risk factors for fetal birth trauma. METHOD: Case-control study conducted from July 2004 to December 2005. We analyzed maternal and fetal variables using software SPSS 19.0. The variables showing a significance level <0.10 in the bivariate analysis were included in the logistic regression analysis. We used the block entry model for selection of the final regression model. RESULTS: During these period, we identified 2137 births and 26 (1.2%) were related to fetal birth injury. Clavicle fracture was the most frequent injury (n = 14; 53.8%), followed by cephalohematoma (n = 5; 19.2%). Umbilical cord blood gas analysis did not show statistical significance. In the regression analysis of the variables that had significance level <0.10, the only independent variables associated with fetal birth injury were vaginal delivery (OR-A: 11.08; 95%CI: 2.45-49.98; p=0.002) and thorax circumference > 33 cm (OR-A: 3.36; 95%CI: 1.35-9.73; p=0.010). CONCLUSION: The risk factors for fetal birth injury were vaginal delivery and chest circumference equal to or larger than 33 cm. Other variables were not associated with the outcome in discussion.

Tocotraumatismo materno e fetal. Experiência de um hospital universitário nível III / Maternal and fetal birth injury: Experience in a tertiary referral university hospital

Introdução: Os tocotraumatismos maternos e fetais, por estarem diretamente vinculados à morbiletalidade, constituem tema importante na área perinatológica. Conhecer a real incidência desse evento torna-se importante para eventuais correções de condutas. O objetivo deste estudo foi identificar a prevalência e os tipos de tocotraumatismos materno e fetal na população usuária de um hospital universitário nível III. Métodos: Estudo de corte transversal, que envolveu gestantes no período de julho/2004 a dezembro/2005. Foram avaliadas variáveis maternas e neonatais. Utilizou-se o programa estatístico SPSS 16.0 para analisar as médias, desvios padrões e percentuais. Resultados: Em 2.137 nascimentos foram identificados 25 casos (1,2%) de tocotraumatismo fetal e 34 (1,6%) de tocotraumatismo materno. Dentre os tocotraumatismos fetais, a via de parto predominante foi a vaginal (88%) e a média da idade materna foi de 25,1±5,8 anos. O peso fetal médio foi de 3.366,4g±696,3g. As lesões leves foram as mais observadas (n=16; 64%). A fratura de clavícula foi o tocotraumatismo mais prevalente, seguido do céfalo-hematoma. Dentre os tocotraumatismos maternos, 33 nascimentos ocorreram via vaginal (97,1%) e a média da idade materna foi de 26,6±7,1 anos. O peso fetal médio foi de 3.152,9g ± 507,8g. As lesões mais observadas foram as de fúrcula vaginal (n=19; 55,9%). Conclusão: Dentre os casos de tocotraumatismo fetal (1,2%), as lesões do tipo leve e superficial foram as mais observadas, prevalecendo a fratura de clavícula. Dentre os casos de tocotraumatismos maternos (1,6%), as lacerações do 1.o e 2.o graus foram as mais prevalentes

Introduction: Because the maternal and fetal birth injuries are directly linked to morbidity/mortality, they are a major theme in the perinatal field. To get to know the real incidence of such events becomes important in order to correct any misconducts. The aim of this study was to determine the prevalence and the types of maternal and fetal birth injuries in the population cared for at a tertiary referral university hospital. Methods: A cross-sectional study involving pregnant women in the Jul/2004-Dec/2005 period. Maternal and neonatal variables were evaluated. Statistical software SPSS 16.0 was used in the analysis of means, standard deviations, and percentages. Results: Of 2.137 births, 25 cases (1.2%) of fetal and 34 (1.6%) cases of maternal birth injuries were reported. Among the fetal birth injuries, vaginal childbirth was the prevailing route of delivery (88%) and the mean maternal age was 25.1±5.8 years. The mean birth weight was 3.366.4g±696.3g. Minor lesions were the most prevalent ones (n=16; 64%). Fracture of the clavicle was the commonest injury, followed by cephalhematoma. Among the maternal birth injuries, 33 were through vaginal childbirth (97.1%) and the mean maternal age was 26.6±7.1 years. The mean birth weight was 3.152.9g±507.8g. The commonest injuries were those to the vaginal furcula (n=19; 55.9%). Conclusion: Among the cases of fetal birth injury (1.2%), minor, superficial lesions were the most frequent ones, with fracture of the clavicle prevailing. Among the maternal birth injuries (1.6%), 1st and 2nd degree lacerations were the most prevalent