Inferior Vena Cava [IVC]
The main vein from the lower part of the body which returns deoxygenated blood to the heart.
Cardiac
Innocent Murmur
A murmur heard in healthy children, which does not signify any underlying heart disease or defect. These soft heart murmurs are very common and are of no significance.
Inotropes
Positive inotropes: Any medicine that increases the strength of the heart’s contraction. Negative inotropes: Any medicine that decreases the strength of the heart’s contraction and the blood pressure in the vessels.