Search results
Results from the WOW.Com Content Network
The heart failure is due to the size of the arteriovenous shunt that can steal 80% or more of the cardiac output, with large volumes of blood under high pressure returning to the right heart and pulmonary circulation and sinus venosus atrial septal defects. [4] [5] It is also the most common cause of death in such patients. [6]
The reduced blood flow through the umbilical vein at birth will collapse and close the ductus venosus. Hence, the IVC will only carry deoxygenated blood from the infant's organs and lower extremities. Second, as the infant breathes, the lungs will expand and fill the alveoli with oxygen.
It takes place in normal pregnancies as well as when there are obstetric or trauma related complications to pregnancy. Normally the maternal circulation and the fetal circulation are kept from direct contact with each other, with gas and nutrient exchange taking place across a membrane in the placenta made of two layers, the syncytiotrophoblast ...
During pregnancy the plasma volume increases by 40-50% and the red blood cell volume increases only by 20–30%. [22] These changes occur mostly in the second trimester and prior to 32 weeks gestation. [24] Due to dilution, the net result is a decrease in hematocrit or hemoglobin, which are measures of red blood cell concentration.
The deep venous system is primarily composed of traditional veins inside the deep structures of the brain, which join behind the midbrain to form the great cerebral vein (vein of Galen). This vein merges with the inferior sagittal sinus to form the straight sinus which then joins the superficial venous system mentioned above at the confluence ...
The classic triad of the vasa praevia is: membrane rupture, painless vaginal bleeding and fetal bradycardia or fetal death. Prior to the advent of ultrasound, this diagnosis was most often made after a stillbirth or neonatal death in which the mother had ruptured her membranes, had some bleeding, and delivered an exsanguinated baby.
Absence of the great cerebral vein is a congenital disorder.The deep cerebral veins of the brain normally drain through the great cerebral vein. In its absence, the veins from the diencephalon and the basal ganglia drain laterally into the transverse sinus instead of conjoining in the midline through the Galenic drainage system. [8]
Pregnancy from 24–28 Weeks Gestation: Intervention should be provided only after educating decision-makers of potential risks. Pregnancy after 28 Weeks Gestation: Intervention should be provided until fetus can be delivered or the mother's condition worsens. A second view considers the autonomy of the mother and her right to die. For example ...