High blood glucose, also called blood sugar, can harm your baby during the first weeks of pregnancy, even before you know you are pregnant. If you have diabetes and are already pregnant, see your doctor as soon as possible to make a plan to manage your diabetes.
These are the only veins in the body that carry fresh, oxygenated blood. Blood leaves the heart from the left ventricle through the artery called the aorta. The aorta has several branches into other arteries that are carrying blood away from the heart and to the body tissues.
The superior vena cava (SVC) is a large vein that carries blood from the upper half of the body straight to the heart. It lies in the middle of the chest, behind the breast bone (sternum). Superior vena cava obstruction (SVCO) happens when something blocks the blood from flowing along the SVC.