Apnea

The absence of breathing. Sleep apnea is a common sleep disorder characterized by brief interruptions of breathing during sleep. Episodes usually last 10 seconds or more and occur repeatedly throughout the night. People with sleep apnea will partially awaken as they...

Arrhythmias

Abnormal heart rhythms; dysrhythmias. An arrhythmia is a problem with the speed or rhythm of the heartbeat. During an arrhythmia, the heart can beat too fast, too slow, or with an irregular rhythm. A heartbeat that is too fast is called tachycardia. A heartbeat that...

Arteriosclerosis

Hardening of the arteries; types generally recognized are: atherosclerosis, Mönckeberg’s arteriosclerosis, and arteriolosclerosis. Atherosclerosis is a disease in which plaque builds up on the insides of the arteries. Arteries are blood vessels that carry...

Artery

A vessel that carries blood from the heart to the to other areas of the body. Arteries that carry blood to the brain are the carotid arteries—one on each side of the neck—that divide into internal and external carotid arteries. The internal carotid arteries supply...

Arthritis

Inflammation of a joint or a state characterized by inflammation of joints. Arthritis is caused by inflammation, of the tissue lining the joints. Some signs of inflammation include redness, heat, pain, and swelling. In some types of arthritis, the joints involved can...

Articulation

The adjustments and movements of speech organs involved in pronouncing a particular sound, taken as a whole. A neurological examination assesses motor and sensory skills, the functioning of one or more cranial nerves, articulation, hearing, vision, coordination and...