Category: Pa-Pb

A prefix with many meanings, including: alongside of, beside, near, resembling, beyond, apart from, and abnormal. For example, the parathyroid glands are called “para-thyroid” because they are adjacent to the thyroid. For another example, paraumbilical means alongside the umbilicus (the belly button). The prefix “para-” comes straight from the Greek.

Any woman who has given birth once or more is termed a “para.” Note that, for a pregnancy to count as a “birth,” it must go to at least 20 weeks’ gestation (the mid-point of a full-term pregnancy) or yield an infant that weighs at least 500 grams, irrespective of whether the infant is live…

Swelling of the head of the optic nerve, a sign of increased intracranial pressure. The optic nerve head, also called the optic disk or papilla, is the area where the optic nerve (the nerve that carries messages from the eye to the brain) enters the eyeball. The finding of papilledema is made with the ophthalmoscope (the instrument that shines…

1. Prostatic acid phosphatase. 2. Pulmonary artery pressure.

Panniculus: a sheet or layer of tissue. The term panniculus is most commonly used in the lay press to refer to an abdominal panniculus adiposus, a sheet of fat tissue that is present in the lower abdominal area. An abdominal panniculus may be seen with obesity, following pregnancy, or after significant weight loss. In severe cases, the fat layer…

An anxiety disorder that is characterized by sudden attacks of fear and panic. Panic attacks may occur without a known reason, but more frequently they are triggered by fear-producing events or thoughts, such as taking an elevator or driving. Symptoms of panic attacks include rapid heartbeat, strange chest sensations, shortness of breath, dizziness, tingling, and anxiousness. Hyperventilation,…

A sudden strong feeling of fear that prevents reasonable thought or action. The word comes from the name of the Greek woodland god Pan, who was a frightening figure’part human, part goat’and whose pet caprice was to terrify people who ventured into rural areas.

Inadequate or absent production of the anterior pituitary hormones due to various causes. The anterior pituitary produces the hormones thyrotropin (thyroid-stimulating hormone [TSH]), corticotropin (adrenocorticotropic hormone [ACTH]), luteinizing hormone (LH), follicle-stimulating hormone (FSH), growth hormone (GH), and prolactin (PRL). Also known as hypopituitarism. The condition may occur at birth or may be acquired later in life. Acquired hypopituitarism is more common than the congenital (present at birth) form. Symptoms include…

An epidemic (a sudden outbreak) that becomes very widespread and affects a whole region, a continent, or the world due to a susceptible population. By definition, a true pandemic causes a high degree of mortality (death) By contrast: The word “pandemic” comes from the Greek “pan-“, “all” + “demos,” “people or population” = “pandemos” = “all the people.” A…

A shortage of all types of blood cells. Pancytopenia can be caused by a side effect of many medications (such as azathioprine, methotrexate, and others) or diseases (such as lupus and bone marrow disorders). Treatment is directed toward the underlying cause and may be supplemented by medications that stimulate the bone marrow.