| myotonia | Increased muscular irritability and contractility with decreased power of relaxation; toxic spasm of muscle. (12 Dec 1998) |
|---|---|
| myotonia acquisita | Acquired myotonia following exposure to certain toxins. (05 Mar 2000) |
| myotonia atrophica | A rare, slowly progressive, hereditary disease transmitted as an autosomal dominant trait and characterised by myotonia followed by atrophy of the muscles, cataracts, hypogonadism, balding, and cardiac abnormalities. (12 Dec 1998) |
| myotonia congenita | A congenital genetic disease characterised by tonic spasm and rigidity of certain muscles when an attempt is made to move them after a period of rest or when mechanically stimulated. The stiffness disappears as the muscles are moved. (12 Dec 1998) |
| myotonia dystrophica | <neurology> An inherited human neuromuscular disease classed as an autosomal dominant disease in which there is progressive muscle weakening and wasting. A triplet repeat syndromes (like fragile X syndrome), this most common adult form of muscular dystrophy is caused by expansion of the unstable trinucleotide repeat CTG in the 3' untranslated region on chromosome 19q13 (cAMP-dependent muscle protein kinase gene). Anticipation has been associated with further expansion of the repeat upon transmission to subsequent generations (the inheritance pattern is autosomal dominant), although contraction has been noted to occur as well. Especially severe neonatal cases have been born to affected mothers preferentially, suggesting a role for genomic imprinting as well. The classic physical signs include atrophy of facial muscles, cataracts, and delayed muscle relaxation. Detection of the expanded trinucleotide repeat is accomplished by PCR or Southern blot and expansion appears to correlate with decreased transcription of the protein kinase gene. Inheritance: autosomal dominant. (29 Dec 1997) |
| myotonia neonatorum | Hypocalcaemic tetany occurring in neonates or young infants, due to transient functional hypoparathyroidism in consumption of cow's milk (high phosphorus content). Synonym: myotonia neonatorum, tetania neonatorum, tetanism. (05 Mar 2000) |
| auscultatory percussion | Auscultation of the chest or other part at the same time that percussion is made, to aid in hearing the sound made by percussion. (05 Mar 2000) |
| bimanual percussion | Immediate percussion in which the finger of one hand taps the other hand; a form of mediate percussion. (05 Mar 2000) |
| palpatory percussion | Finger percussion in which attention is focused upon the resistance and reverberation of the tissues under the finger as well as upon the sound elicited. Synonym: plessesthesia. (05 Mar 2000) |
| mediate percussion | Percussion effected by the intervention of a finger or a plessimeter between the striking finger or plessor and the part percussed. (05 Mar 2000) |
| percussion | 1. The act of percussing, or striking one body against another; forcible collision, especially. Such as gives a sound or report. 2. Hence: The effect of violent collision; vibratory shock; impression of sound on the ear. "The thunderlike percussion of thy sounds." (Shak) 3. <medicine> The act of tapping or striking the surface of the body in order to learn the condition of the parts beneath by the sound emitted or the sensation imparted to the fingers. Percussion is said to be immediate if the blow is directly upon the body; if some interventing substance, as a pleximeter, is, used, it is called mediate. Center of percussion. See Center. Percussion bullet, a bullet containing a substance which is exploded by percussion; an explosive bullet. Percussion cap, a small copper cap or cup, containing fulminating powder, and used with a percussion lock to explode gunpowder. Percussion fuze. See Fuze. Percussion lock, the lock of a gun that is fired by percussion upon fulminating powder. Percussion match, a match which ignites by percussion. Percussion powder, powder so composed as to ignite by slight percussion; fulminating powder. Percussion sieve, Percussion table, a machine for sorting ores by agitation in running water. Origin: L. Percussio: cf. F. Percussion. See Percuss. Source: Websters Dictionary (01 Mar 1998) |
| percussion sound | Any sound elicited on percussing over one of the cavities of the body. (05 Mar 2000) |
| percussion wave | The main positive wave of an arterial pulse tracing. (05 Mar 2000) |
| clavicular percussion | Percussion, usually direct, along the entire clavicle to demonstrate dullness, particularly in apical pulmonary tuberculosis. (05 Mar 2000) |
| piano percussion | Examination for dullness by striking the chest wall directly with the fingertips of one hand successively, beginning with the fifth finger. Synonym: piano percussion. (05 Mar 2000) |