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.
Most people are aware that hearing protection comes in two main. types; ear muffs (which if you are lucky make you look like some. cool F1 racing engineer, or if you are unlucky make you look like a. reject from the Mickey Mouse Club); or ear plugs. One of the issues which is often overlooked is that not all hearing.