Friedreich phenomenon

Fried·reich phe·nom·e·non

(frēd'rīk), phenomenon in which the tympanitic percussion sound over a pulmonary cavity is slightly raised in pitch on deep inspiration.

Friedreich,

Nikolaus, German neurologist, 1825-1882. Friedreich ataxia - sclerosis of the posterior and lateral columns of the spinal cord, occurring in children and marked by ataxia in the lower extremities, extending to the upper, followed by paralysis and contractures. Synonym(s): Biemond ataxia; hereditary spinal ataxiaFriedreich disease - an ill-defined disorder marked by rapid and widespread muscle contractions Synonym(s): Friedreich spasms; myoclonus multiplex; paramyoclonus multiplexFriedreich phenomenon - the tympanitic percussion sound over a pulmonary cavity is slightly raised in pitch on deep inspiration.Friedreich sign - in adherent pericardium, sudden collapse of the previously distended veins of the neck at each diastole of the heart.Friedreich spasms - Synonym(s): Friedreich disease