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.
Receiver-In-Canal (RIC) With the RIC hearing aid, there is a small case that sits behind the ear, and a connecting tube between the case and the earpiece that is nearly invisible. The RIC can be made with one of two types of earpieces: one is a mold that fits into the ear canal. The other is an open fit earpiece.