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.
Behind the ear (BTE) hearing aids. BTE aids have an earmould that fits snugly inside your ear, while the rest of the aid rests behind your ear. Some models have twin microphones, which let you switch between all-round sound and a more directional setting that helps you focus on what you want to hear in noisy places.