Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «H»:
Hypoparathyroidism: Underfunction of the parathyroid glands with deficient production of the hormone parathormone which leads to low blood calcium (hypocalcemia). The parathyroid glands are located adjacent to the thyroid gland. They may be missing due to a birth defect, impaired by autoimmune disea...
Hypopharyngeal diverticulum: See: Zenker diverticulum....
Hypophosphatemia: A less
than normal blood level of phosphate.
The opposite of hyperphosphatemia. ...
Hypopigmented: Underpigmented. ...
Hypoplasia: Underdevelopment or incomplete development of a
tissue or organ. For example, there can be hypoplasia (underdevelopment) of the enamel of
the teeth. Hypoplasia is less drastic than aplasia where there is no development at all....
Hypoplasia of the thymus and parathyroids
Hypoplasia of the thymus and parathyroids: See: DiGeorge syndrome....
Hypoplasia, syndromatic hepatic ductular
Hypoplasia, syndromatic hepatic ductular:
Also called Alagille syndrome or arteriohepatic dysplasia, this is a genetic disorder characterized by jaundice in the newborn period, liver disease with cholestasis, peripheral pulmonic stenosis and unusual face. Children with Alagille syndrome usually pres...
Hypoplastic anemia-triphalangeal thumbs
Hypoplastic anemia-triphalangeal thumbs, Aase-Smith type: See: Aase-Smith syndrome II....
Hypoplastic left heart syndrome
Hypoplastic left heart syndrome:
A form of congenital heart disease in which the whole left
half of the heart (including the aorta , aortic valve, left
ventricle and mitral valve) is underdeveloped
(hypoplastic). Blood returning from the lungs has to flow
through an opening in the wall betwee...
Hypopnea: Literally, underbreathing. Breathing that is shallower or slower than normal. Hypopnea is distinct from apnea in which there is no breathing.
Hypopnea comes from the Greek roots hypo- (meaning low, under, beneath, down, below normal) and pnoe (meaning breathing)....
Hypoproteinemic hypertrophic gastropathy
Hypoproteinemic hypertrophic gastropathy: See: Giant hypertrophic gastritis....
Hyposmia: A reduced ability to smell and to detect odors. Some people have anosmia and can detect no odors....
Hypospadias: A birth defect of the penis involving
the urethra (the transport tube leading from the bladder to discharge urine outside the body). The urethra normally travels in the male through the full length of the penis so that the stream of urine comes from the urethral opening at the tip of ...
Hypotension: Any blood pressure that is below the
normal expected for an individual in a given environment.
Hypotension is the opposite of hypertension (abnormally high
Hypotension is a relative term because the blood pressure normally
varies greatly with activity, age, medica...
Hypotension, orthostatic: A temporary lowering of
blood pressure (hypotension) due usually to suddenly standing
up (orthostatic). Orthostatic hypotension may be experienced by healthy
people -- it is more common in older people -- who rise quickly from
a chair, especially after a meal, and have...