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.
2) Use the proper sized ear tips. Earphones usually come with multiple sizes of ear tips. Trying all the sizes that came with the earphone will help you achieve the best combination of comfort, security, and good sound quality. Even if you have preconceived thoughts about the size of your ear/ear canal, a particular ear tip may fit better than others.