Category: H

A form of periodic paralysis with onset usually before adulthood. An attack typically comes on during sleep, after strenuous exercise during the day. The weakness may be so pronounced as to prevent the patient from being able to call for help. The attack may last from several hours to a day or more. The diagnosis…

A rare form of periodic paralysis characterized by brief (1- to 2-hr) attacks of limb weakness. Respiratory muscles are involved in some cases. “Hyperkalemic” is misleading because the potassium levels may be normal. But, because an attack is precipitated by the administration of potassium, this form of paralysis is better termed “potassium-sensitive periodic paralysis.”  

Parallax in which, when one eye is covered, the object viewed appears to move closer to the uncovered eye.  

Parallax in which, when one eye is closed, the object viewed appears to move closer to the closed eye.  

Papilloma that develops from squamous epithelium.  

A wet-sheet pack extending from the axillae to below the knees.  

The female gamete, required for reproduction. The ovum develops from an oogonium within the graafian follicle of the ovary and matures through the meiotic process of oogenesis. A mature ovum is about 0.13 to 0.14 mm (0.0051 to 0.0055 in) in diameter. At ovulation, the ovum is bounded by a translucent cellular membrane (the zona…

An ovum that undergoes complete cleavage, as opposed to partial or meroblastic cleavage.  

A disorder characterized by enlargement of the distal phalanges of the fingers and toes and a thickening of their distal ends, accompanied by a peculiar longitudinal curving of nails. The wrists and interphalangeal joints may become enlarged, as may the distal ends of the tibia, the fibula, and the jaw. This condition may be associated…

An oil-in-water emulsion in the form of a standardized ointment preparation used topically as an emollient.