Presumed Normal Hemodynamic Values of the Arteries in the Final Third Period of Gestation in Bitches

Background: Doppler ultrasonography enables the investigation of vascular blood flow indexes in gestational assessment, being able to detect resistances that can affect fetal and maternal circulation, such as cases placental insufficiency, associated with cerebral oxygenation deficit distress. The study aims assume hemodynamically normal values final third gestation bitches, umbilical, uteroplacental, middle internal carotid arteries, correlating obtained velocimetric indexes, for assessment feto-placental prediction viability centralization probable date delivery.Materials, Methods & Results: Thirty healthy bitches were examined (40-60 days). These evaluated by at 2 times (T): T1: between 40-50 days; T2: 51-60 gestation. At each time point, peak systolic velocities (PSV) end-diastolic (EDV) used obtain pulsatility (IP) resistivity (IR) arteries fetuses evaluated. Also, systole/diastole (S/D) ratio these vessels was data subjected analysis variance Tukey test, using a P value equal 5%. A significant difference observed phases all studied vessels. There an increase PSV EDV decrease delivery approached. umbilical cord IR showed from P1 P2 (P < 0.05), while IP decreased same time. For variables there statistically 0.05). In uteroplacental artery, similarly P2, S/D up 60 days (P2). during interval pregnant bitches. when analyzed comparatively As artery increased until end pregnancy. Likewise, pregnancy (P2).Discussion: hemodynamic uterine significantly different 40 50 (P1) (P2), resistance velocities. It be related greater association maternal-fetal perfusion, due demand development fetus. Middle Cerebral Artery (MCA) also changes pregnancy, reduced, differing P2. diastolic progressively, IR, decreased, periods (P1 P2), providing canine fetuses, maintaining heart rate, indicating positive viability. Keywords: Doppler, ultrasound, carotid, artery.