Umbilical venous doppler velocity pulsations and inferior vena cava pressure elevations in fetal lambs

Reed, Kathryn L.; Chaffin, David G.; Anderson, Caroline F.

doi:10.1016/0029-7844(95)00461-0

Cited by 46 publications

(19 citation statements)

References 8 publications

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“…Several studies addressed the role of the vascularity of genital organs in the estrous cycle, reproductive life, and gestation (Reed et al 1996, Nautrup 1998, Bollwein et al 2000, 2002a, 2002b, Köster et al 2001, Alvarez-Clau & Liste 2005, Di Salvo et al 2006, Scotti et al 2008, Brito et al 2010, Polisca et al 2010, Blanco et al 2011, Pereira et al 2012a, 2012b. Color-Doppler ultrasonography was previously used in cows to evaluate the vascularity of follicle, CL, and conceptus (Myamoto et al 2005, Pareja et al 2010, Silva et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Follicle and corpus luteum size and vascularity as predictors of fertility at the time of artificial insemination and embryo transfer in beef cattle

et al. 2015

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Abstract:Two ultrasound based fertility prediction methods were tested prior to embryo transfer (ET) and artificial insemination (AI) in cattle. Female bovines were submitted to estrous synchronization prior to ET and AI. Animals were scanned immediately before ET and AI procedure to target follicle and corpus luteum (CL) size and vascularity. In addition, inseminated animals were also scanned eleven days after insemination to target CL size and vascularity. All data was compared with fertility by using gestational diagnosis 35 days after ovulation. Prior to ET, CL vascularity showed a positive correlation with fertility, and no pregnancy occurred in animals with less than 40% of CL vascularity. Prior to AI and also eleven days after AI, no relationship with fertility was seen in all parameters analyzed (follicle and CL size and vascularity), and contrary, cows with CL vascularity greater than 70% exhibit lower fertility. In inseminated animals, follicle size and vascularity was positive related with CL size and vascularity, as shown by the presence of greater CL size and vascularity originated from follicle with also greater size and vascularity. This is the first time that ultrasound based fertility prediction methods were tested prior to ET and AI and showed an application in ET, but not in AI programs. Further studies are needed including hormone profile evaluation to improve conclusion.

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Section: Introductionmentioning

confidence: 99%

Follicle and corpus luteum size and vascularity as predictors of fertility at the time of artificial insemination and embryo transfer in beef cattle

et al. 2015

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“…Fetal heart rate has previously been shown to affect venous blood flow and pressure in the UV and fetal central veins in lamb preparations. This may also influence systolic and diastolic venous blood flows differently . If recorded without UV‐pulsations, the diastolic S/a ratio seems to lack association with the adverse perinatal outcome variables that we have tested and the association with UV‐pulsations was also lower compared with the other DV indices.…”

Section: Discussionmentioning

confidence: 77%

Alterations in ductus venosus velocity indices in relation to umbilical venous pulsations and perinatal outcome

Dahlbäck

Myren

Gudmundsson

2015

Acta Obstet Gynecol Scand

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Introduction. Abnormal blood velocity in the ductus venosus is more frequently detected than pulsations in the umbilical vein, but both are considered to be indicators of fetal compromise. The aim of this study was to investigate blood flow patterns in the ductus venosus and the association between individual blood velocity ratios and pulsations in the umbilical vein and perinatal outcome. Material and methods. Retrospective cohort study on Doppler ultrasound examination of ductus venosus and umbilical venous blood velocity in 358 high-risk pregnancies. Ductus venosus blood velocity pattern was analyzed for pulsatility index and the following velocity ratios: S/ ES, S/a and ES/a (where S is systole, ES is end-systole, and a is atrial contraction). Ductus venosus ratio z-scores were calculated and related to pulsations in the umbilical vein and adverse perinatal outcome. Results. Systolic ratios in the ductus venosus were less frequently abnormal than ratios taking into account diastolic velocities, particularly at full-term. High S/ES, ES/a ratios and pulsatility index (z-score >2), were all related to presence of pulsations in the umbilical vein. Umbilical venous pulsations were the best indicator of adverse perinatal outcome. Conclusions. Changes in ductus venosus blood flow during systole occur more rarely than diastolic changes, and alterations in end-diastolic blood velocity in the ductus venosus might give falsepositive indications of worsening fetal condition. Umbilical venous pulsations seem to better predict adverse outcome of pregnancy than do indices in the ductus venosus.

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“…Experience at the author's own institution and animal experimentation has also confirmed these findings [163,168]. Detailed reviews of the clinical value of blood fiow studies ofthe ductus venosus by Sherer et al [169] and Kiserud et al [170] suggest that evaluation of this vessel provides important clinical information regarding both fetal welfare and the timing of pathological events related to fetal hypoxia.…”

Section: Fetal Venous Systemmentioning

confidence: 86%

“…All seven of the singleton fetuses were significantly growth restricted while the two twin pregnancies had twin-twin transfusion syndrome with the donor twin being growth restricted and the recipient twin being macrosomic. Studies in the fetal lamb have supported these clinical finding, suggesting that umbilical venous pulsations develop as a result of significant fetal venous pressure elevations [162]. In many clinical situations umbilical venous pulsations do appear to be a significant pathological event that requires careful fetal evaluation, especially evaluation of the fetal cardiovascular system and they are frequently related to very poor perinatal outcome.…”

Section: Fetal Venous Systemmentioning

confidence: 92%

An update in the ultrasonic diagnosis and evaluation of intrauterine growth restriction

Ott

2005

The Ultrasound Review of Obstetrics & Gynecology

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A number of methods exist for identifying and monitoring suspected intrauterine growth restriction (IUGR). Estimation of fetal weight or abdominal circumference, combined with Doppler wave-form analysis of the uterine arterv' appears to be the most sensitive and specific method of identifying IUGR, The use of Doppler wave-form analysis of the uterine artery holds promise as a method of early identification of patients at risk for IUGR, Doppler ultrasound, coupled with biophysical testing, can be used to monitor the IUGR fetus and plan for the optimal time of delivery.

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Umbilical venous doppler velocity pulsations and inferior vena cava pressure elevations in fetal lambs

Abstract: Umbilical venous Doppler velocity pulsations developed after fluid administration and were associated with increases in inferior vena cava peak pressure. These findings suggest that umbilical venous pulsations develop when fetal venous pressures are elevated.

Cited by 46 publications

References 8 publications

Follicle and corpus luteum size and vascularity as predictors of fertility at the time of artificial insemination and embryo transfer in beef cattle

Follicle and corpus luteum size and vascularity as predictors of fertility at the time of artificial insemination and embryo transfer in beef cattle

Alterations in ductus venosus velocity indices in relation to umbilical venous pulsations and perinatal outcome

An update in the ultrasonic diagnosis and evaluation of intrauterine growth restriction

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