| periodic migrainous neuralgia | Recurrent facial pain and headache, more common in men than in women. Synonym: Harris' migraine. (05 Mar 2000) |
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| periodic neutropenia | Neutropenia recurring at regular intervals (14 to 45 days), in association with various types of infectious diseases, e.g., stomatitis, cutaneous ulcers, furuncles, arthritis, and others. Synonym: cyclic neutropenia. (05 Mar 2000) |
| periodic oedema | A vascular reaction involving the deep dermis or subcutaneous or submucal tissues, representing localised oedema caused by dilatation and increased permeability of the capillaries and characterised by development of giant wheals. (18 Nov 1997) |
| periodic ophthalmia | An acute iridocyclitis of horses, involving one or both eyes; it subsides only to recur at intervals of varying length and usually ends in blindness; the cause is uncertain but some have associated it with leptospires; does not appear to be contagious. Synonym: moon blindness. (05 Mar 2000) |
| periodic paralysis | Term for a group of diseases characterised by recurring episodes of muscular weakness or flaccid paralysis without loss of consciousness, speech, or sensation; attacks begin when the patient is at rest, and there is apparent good health between attacks. See: hyperkalaemic periodic paralysis, hypokalaemic periodic paralysis, normokalaemic periodic paralysis. (05 Mar 2000) |
| periodic peritonitis | familial paroxysmal polyserositis |
| periodic polyserositis | familial paroxysmal polyserositis |
| periodic system | The arrangement of the chemical elements in a definite order as indicated by their respective atomic numbers in such a way that groups of elements with similar chemical properties (similar valence shell electron number) are grouped together. See: Mendeleeff's law. (05 Mar 2000) |
| hyperkalaemic periodic paralysis | A form of periodic paralysis in which the serum potassium level is elevated during attacks; onset occurs in infancy, attacks are frequent but relatively mild, and myotonia is often present; autosomal dominant inheritance. (05 Mar 2000) |
| hypokalaemic periodic paralysis | <biochemistry> A rare inherited disorder, affecting men more often than women, characterised by intermittent episodes of muscle weakness or paralysis. One form, known as hypokalaemic periodic paralysis, is an autosomal recessive disorder that is characterised by bouts of muscle weakness (or paralysis) accompanied by low serum potassium levels. Inheritance: autosomal recessive. Incidence: 1 in 100,000. (11 Jan 1998) |
| sodium-responsive periodic paralysis | A form of periodic paralysis in which the serum potassium level is within normal limits during attacks; onset usually occurs between the ages of 2 and 5 years; there is often severe quadriplegia, usually improved by the administration of sodium salts; autosomal dominant inheritance. Synonym: sodium-responsive periodic paralysis. (05 Mar 2000) |
| normokalaemic periodic paralysis | A form of periodic paralysis in which the serum potassium level is within normal limits during attacks; onset usually occurs between the ages of 2 and 5 years; there is often severe quadriplegia, usually improved by the administration of sodium salts; autosomal dominant inheritance. Synonym: sodium-responsive periodic paralysis. (05 Mar 2000) |
| benign familial chorea | A rare, nonprogressive movement disorder characterised by chorea and athetosis appearing in early childhood, most commonly manifested as gait ataxia and upper limb coordination. Intellect is unaffected. Probably autosomal-dominance inheritance with incomplete penetrance. (05 Mar 2000) |
| benign familial chronic pemphigus | Recurrent eruption of vesicles and bullae that become scaling and crusted lesions with vesicular borders, predominantly of the neck, groin, and axillary regions; autosomal dominant inheritance, presenting in late adolescence or early adult life. Synonym: Hailey-Hailey disease. (05 Mar 2000) |
| benign familial icterus | Mild jaundice due to increased amounts of unconjugated bilirubin in the plasma without evidence of liver damage, biliary obstruction, or haemolysis; thought to be due to an inborn error of metabolism in which the excretion of bilirubin by the liver is defective, ascribed to decreased conjugation of bilirubin as a glucuronide or impaired uptake of hepatic bilirubin. Synonym: benign familial icterus, constitutional hepatic dysfunction, Gilbert's disease, Gilbert's syndrome, Hebra's disease. (05 Mar 2000) |