Fetal pH value determined by cordocentesis: an independent predictor of the development of antepartum fetal heart rate late decelerations in growth retarded fetuses with absent end-diastolic velocity in umbilical artery

1996 ◽  
Vol 24 (6) ◽  
pp. 601-608 ◽  
Author(s):  
Domenico Arduini ◽  
Giuseppe Rizzo ◽  
Alessandra Capponi ◽  
Donatella Rinaldo ◽  
Carlo Romanini
Keyword(s):  
Heart Rate ◽  
Fetal Heart Rate ◽  
Umbilical Artery ◽  
Fetal Heart ◽  
Ph Value ◽  
Independent Predictor ◽  
Diastolic Velocity ◽  
Fetal Ph

Assessment of umbilical artery flow and fetal heart rate to predict delivery time in bitches

2016 ◽  
Vol 86 (7) ◽  
pp. 1654-1661 ◽  
Author(s):  
Amália Turner Giannico ◽  
Daniela Aparecida Ayres Garcia ◽  
Elaine Mayumi Ueno Gil ◽  
Marlos Gonçalves Sousa ◽  
Tilde Rodrigues Froes
Keyword(s):  
Heart Rate ◽  
Fetal Heart Rate ◽  
Umbilical Artery ◽  
Fetal Heart ◽  
Delivery Time ◽  
Artery Flow

Relation of Bradycardia and Blood Pressure of the Fetal Lamb in Utero to Mild and Severe Hypoxia

1958 ◽  
Vol 193 (2) ◽  
pp. 249-256 ◽  
Author(s):  
S. R. M. Reynolds ◽  
W. M. Paul
Keyword(s):  
Blood Pressure ◽  
Heart Rate ◽  
Fetal Heart Rate ◽  
Umbilical Artery ◽  
Fetal Heart ◽  
Periodic Breathing ◽  
In Utero ◽  
Severe Hypoxia ◽  
Vagal Activity ◽  
Moderate Hypoxia

Fetal lambs of mostly 130–145 days gestation age, were subjected to hypoxia by having the ewe breathe 13%, 10% and 6% oxygen. The umbilical artery and umbilical veins were catheterized with the fetus still in utero along with the maternal carotid artery. Blood pressures and heart rates were recorded, as well as maternal respiratory movement through an intrapleural trochar. Samples of ewe arterial and fetal venous bloods were taken for O2 and CO2 tension analysis by the Riley method. With mild or moderate hypoxia, umbilical artery mean and pulse pressures generally increase; fetal heart rate may increase, decrease, or fluctuate. With severe hypoxia, mean and pulse pressures in the umbilical artery decrease along with the fetal heart rate. When periodic breathing occurred in the ewe, reciprocal effects on the ewe and fetal circulations were observed; as the ewe heart rate and blood pressure went up during apnea, the fetal heart rate and blood pressure went down and vice versa when respiratory movements were resumed. Bradycardia in its initial stages may be momentarily stopped by injection of atropine into the fetus. The critical O2 tension for depression of the fetal circulation is between 10–30 mm Hg. Bradycardia is not indicative of mild or moderate hypoxia; blood pressure improves with mild or moderate hypoxia; when blood pressure and heart rate both decline in severe hypoxia, it is indicative of fetal heart failure and imminent fetal death. The initial hypoxic bradycardia results from vagal activity since it can be blocked briefly by atropine and since the heart rate may fluctuate between beats from a slow to a fast rate. Fetal heart rate and blood pressure respond quickly to change of the gas content of the ewe's blood as demonstrated by changes occurring during periodic breathing in the ewe.

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