Quick Answer. Cardiotonic drugs are substances that increase the contracting mechanism within the heart, thereby causing more blood to be pumped throughout the circulatory system. These drugs usually affect intracellular calcium levels in the heart muscle to achieve the desired increase in muscle action.
Like the name suggests, the entire CIC hearing aid fits into the ear canal. There is nothing on the outside of the ear, making it virtually unnoticeable. The CIC hearing aid is custom-made to fit into your ear canal to ensure a perfect fit.
Completely in the canal hearing aid types, or CICs, refer to those in-the-canal products which are specifically manufactured to sit deep within the ear canal. A well-manufactured CIC may really be invisible, even when the ear containing the CIC is viewed side-on.