Aspectos anatômicos da macro e microvascularização da placenta em ovinos (Ovis aries)

Schoenau, Luciana Silveira Flores; Morais‐Pinto, Luciano de; Pereira, Flávia Thomaz Veréchia; Schoenau, William; Miglino, María Angélica

doi:10.11606/issn.1678-4456.bjvras.2005.26398

Cited by 6 publications

(3 citation statements)

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“…It is also worth emphasizing that the mean RI and PI values reported by Beltrame et al (2017) are similar to those of our study when compared (RI= 0.62;0.60;0.58 / PI= 1.15;1.05;0.97;in early,medium and late pregnancy,respectively). Another hypothesis is that the location of arterial flow is divergent between the studies, taking in consideration that the maternal-fetal vascularization is formed by closely associated vascular systems, with several branches and anastomoses (Schoenau et al, 2005), which can make it difficult to individualize and standardize. In this sense, there is also the variation related to the Doppler insonation angle used in the different studies, considering that the velocity of blood flow usually changes according to the Doppler angle (Serin et al, 2010).…”

Section: Discussionmentioning

confidence: 99%

Doppler sonography of the umbilical and uterine arteries blood flow of pregnant Saanen goats

Silva

Santos

et al. 2022

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The objective was to evaluate the blood flow of the uterine artery (UA) and umbilical artery (UMB) in the physiological pregnancy of goats by means of Doppler throughout the gestational period. Twenty-five Saanen goats weighing 55 ± 10 kg and aged between 2 and 5 were evaluated weekly, from the 21 st until the 143 rd day of gestation, and daily from that period until parturition. Values for peak systolic velocity (PSV), end diastolic velocity (EDV) and resistance (RI) and pulsatility (PI) indices of the uterine and umbilical arteries were determined. The values obtained were correlated with gestational age by Spearman's test, tested for adjustment to regression models and compared with the number of fetuses by ANOVA. The umbilical cord was first visualized at 28 days. Of the variables evaluated, RIUMB and PIUMB correlated with gestational age (p<0.001; and 0.046; respectively) and RIUMB had a low negative correlation with the number of fetuses per pregnancy (p = 0.003; r-Spearman = -0.218). PSVUMB and EDVUMB values did not correlate with gestational age (p=0.737 and 0.768, respectively), but there was a decrease in the mean values throughout pregnancy (PSVUMB= 0.07; 0.31 and EDVUMB= 0.01; 0.06) as well as the change in the flow pattern of the spectral trace. The mean values of the uterine artery dopplervelocimetric variables PSVUT, EDVUT, PIUT and RIUT did not correlate with gestational age (p= 0.324; 0.372, 0.143; 0.13; respectively). It is expected that the results obtained will contribute to a broader understanding of the hemodynamic changes resulting from pregnancy in goats.

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Section: Discussionmentioning

confidence: 99%

Doppler sonography of the umbilical and uterine arteries blood flow of pregnant Saanen goats

Silva

Santos

et al. 2022

Anim. Reprod.

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“…Blood samples were also collected from the neonates four, eight, twelve and twenty-four hours after birth. Total placental blood samples were collected immediately after birth, before placental expulsion, through puncture of the venous intercotyledonary vessels described by (Schoenau et al 2005).…”

Section: Methodsmentioning

confidence: 99%

Assessment of serum lactate levels, blood glucose values and blood gas values in sheep, newborn lambs and placenta

et al. 2018

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RESUMO.-[Avaliação da concentração de lactato sérico, glicemia e hemogasometria de ovelhas, cordeiros recém-nascidos e placenta.] Os principais desafios da transição fetal-neonatal são a estabilização do equilíbrio ácido-básico, glicemia e oxigenação ao longo das primeiras 24 horas de vida. Falhas nesse sistema são a maior causa de morte nesse período e os estudos de viabilidade neonatal tem se concentrado nas avaliações destas variáveis. O objetivo do presente estudo foi avaliar a comparação da lactatemia materna, placentária e neonatal ao nascimento e, ainda, observar o comportamento do lactato, glicemia e hemogasometria nas primeiras 24 horas de vida do neonato ovino. Para tanto, as avaliações foram realizadas ao nascimento, 4, 8, 12 e 24 horas após. A lactatemia neonatal se mostrou próxima à placentária (p=0,991) e significativamente diferente da materna (p=0,011), o que sugere uma influência da produção de lactato pela placenta na lactatemia neonatal ao nascimento. Ao longo das 24 horas de vida foi possível observar a depuração de lactato pelo organismo do neonato, aproximando assim dos valores de referência para a espécie. Na hemogasometria foi possível observar discreta acidose metabólica, com normalização já nas primeiras 4 horas e estabilização completa do equilíbrio ácido-básico ao final das 24 horas de vida. ABSTRACT.-Peternelli Silva L., Lourenço M.L.G., Paula R.A., Verdugo M.R., Pereira K.H.N.P. & Chiacchio S.B. 2018. Assessment of serum lactate levels, blood glucose values and blood gas values in sheep, newborn lambs and placenta. Pesquisa Veterinária Brasileira 38 (9):1878-1884. Newborn animals, in the fetal-to-neonatal transition, usually face several challenges in their first 24 hours, including issues with acid-base balance, glycemic levels and oxygenation. Difficulties to overcome such issues have caused several deaths among newborns. Therefore, studies have been carried out in order to evaluate them. The main purpose of this study is to evaluate the correlation between the serum lactate level in the mother, in the placenta and in the newborn. Moreover, the study measured the lactate level, blood glucose level and blood gas level in the first 24 hours. Tests were carried out right after birth, and at 4, 8, 12 and 24 hours after. Lactate levels were quite similar to the placental levels (p=0.991) which, in turn, were significantly different from the mother's (p=0.011). Results showed that, shortly after birth, the production of lactate in the placenta is part of the issue. Along the first 24 hours, the study observed a reduction of the levels of lactate in newborns; the levels were closer to the normal index levels for the species. Regarding the blood gas test results, we observed mild metabolic acidosis at birth; acid-base balance was completely stable at the end of the period.Pesq. Vet. Bras. 38(9):1878-1884, setembro 2018 Assessment of serum lactate levels, blood glucose values and blood gas values in sheep, newborn lambs and placenta

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“…Podem ser distinguidos cinco tipos de vilos baseados no calibre, característica do estroma e estrutura dos vasos, refletindo diferentes subdivisões da árvore vilosa. (SCHOENAU, 2000). Hafez (1954) BERTOLINI et al, 2002;LAVEN;PETERS, 2001;LEISER et al 1997b;MILES, 2004).…”

Section: Vilos Coriônicosunclassified

Aspectos estereológicos dos vilos coriônicos da placenta de bovinos clonados

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Aspectos anatômicos da macro e microvascularização da placenta em ovinos (Ovis aries)

Cited by 6 publications

References 6 publications

Doppler sonography of the umbilical and uterine arteries blood flow of pregnant Saanen goats

Doppler sonography of the umbilical and uterine arteries blood flow of pregnant Saanen goats

Assessment of serum lactate levels, blood glucose values and blood gas values in sheep, newborn lambs and placenta

Aspectos estereológicos dos vilos coriônicos da placenta de bovinos clonados

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