Maldonado André Luiz Louzada, Araujo Júnior Edward, Mendonça Débora Sartori, Nardozza Luciano Marcondes Machado, Moron Antonio Fernandes, Ajzen Sérgio Aron
Department of Imaging Diagnostic, Federal University of São Paulo (UNIFESP), 05303-000 São Paulo, SP, Brazil.
Vet Med Int. 2012;2012:850867. doi: 10.1155/2012/850867. Epub 2012 Jul 10.
Objective. To verify if the placental thickness allows determining the gestational age, evaluating the correlation between the referred gestational age with the studied one, and the accuracy of the placental thickness measurement (biometry) with fetal morphologic parameters in bitches. Methods. The placental thickness of 336 bitches of diverse breeds was evaluated. Bitches were divided in three groups by body weight: small, medium, and big large size. The gestations pregnancies were evaluated by ultrasound from the third week of gestation. An analysis was performed between the mean values of the gestational age obtained of placental thickness by adjustment of curves and the reported gestational age. Student's t-test was applied to compare the mean of reported and placental thickness gestational age. Significance was defined as P < 0.05. Results. A positive and statistically significant correlation exists between the placental thickness and gestational age. The expression that presents the best correlation coefficient and explanation was thickness of placenta = 0.021x gestational age -0.314. Conclusion. It is possible to determine the gestational age in relation to the placental thickness measured by ultrasound in bitches with a satisfactory accuracy in relation to fetal morphologic parameters as gestational vesicle, ribs, or kidneys.
目的。验证胎盘厚度是否有助于确定妊娠年龄，评估所提及的妊娠年龄与研究的妊娠年龄之间的相关性，以及母犬胎盘厚度测量（生物测量）与胎儿形态学参数的准确性。方法。对336只不同品种的母犬的胎盘厚度进行评估。母犬按体重分为三组：小型、中型和大型。从妊娠第三周开始通过超声评估妊娠情况。通过曲线拟合获得的胎盘厚度妊娠年龄平均值与报告的妊娠年龄之间进行分析。应用学生t检验比较报告的妊娠年龄平均值和胎盘厚度妊娠年龄平均值。显著性定义为P < 0.05。结果。胎盘厚度与妊娠年龄之间存在正相关且具有统计学意义。呈现最佳相关系数和解释的表达式为：胎盘厚度 = 0.021×妊娠年龄 - 0.314。结论。对于母犬，通过超声测量胎盘厚度来确定妊娠年龄是可行的，相对于妊娠囊、肋骨或肾脏等胎儿形态学参数，其准确性令人满意。
