English textbooks

What is a cast? A cast holds a broken bone in place as it heals. Casts also help prevent or decrease muscle contractions, and are effective at providing immobilization. Casts immobilize the joint above and the joint below the area…

What is cat scratch disease in children? Cat scratch disease is a bacterial infection carried in cat saliva. It is passed from a cat bite or scratch to a human. It can also result from a fleabite, but cats are the…

What is a cataract? When light passes into your eye, it goes through the lens. This is a clear structure that focuses light on the inner lining of the back of your eye, allowing you to see. Sometimes the lens…

What are cataracts? A cataract is a clouding of the lens in your eye. The lens is normally clear. When clouding occurs, it keeps light rays from passing through the lens and focusing on the retina. The retina is a…

What are cataracts in children? A cataract is a clouding of the eye’s lens. The lens is normally clear (transparent). Cataracts keep light rays from passing through the lens and focusing on the retina. The retina is the thin layer…

What is CPVT? Catecholaminergic polymorphic ventricular tachycardia (CPVT) is a rare condition. It causes an irregular heart rhythm that can be life-threatening. It often shows up in childhood, but it can show up later in life. The first sign is…

Does this test have other names? Dopamine, epinephrine, and norepinephrine tests  What is this test? This test measures the levels of catecholamines in your blood. The catecholamine hormones are epinephrine, norepinephrine, and dopamine. Epinephrine is also called adrenalin. Catecholamines are…

Does this test have other names? urine metanephrines, epinephrine, norepinephrine, dopamine  What is this test? This test measures the levels of catecholamines in your urine. Catecholamines are hormones made by your adrenal glands. They are released when you have physical…

What is catheter ablation? Catheter ablation is a nonsurgical procedure used to treat an abnormal heartbeat (arrhythmia). An arrhythmia can make your heart beat too fast or in an irregular pattern. During the procedure, a healthcare provider guides a flexible…

Click on the links below to learn more about what causes skin cancer. © 2000-2024 The StayWell Company, LLC. All rights reserved. This information is not intended as a substitute for professional medical care. Always follow your healthcare…

A cerebral cavernous malformation (CCM) is a cluster of abnormal tiny blood vessels (capillaries) and larger stretched out thin-walled blood vessels filled with blood in the central nervous system. In CCM, the walls of the capillaries are thinner than normal.…

Does this test have other names? CD4/CD8 ratio T-cell test What is this test? This test looks at the ratio of 2 important types of white blood cells in your blood. Lymphocytes are a type of white blood cell in your…