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hearing loss of agingPresbycusis Audiology The progressive loss of high pitch auditory discrimination seen in advanced age, affecting ±50% of those > age 75. See Hearing loss.
Hearing loss types
Conductive HL caused by damage to any mechanical components of the ear, eg accumulation of cerumen, disruption of tympanic membrane, fusion of one or more middle ear ossicles; conductive HLs may be amenable to surgery
Sensorineural HL due to a defect in the neural pathways, which may be at the level of the cochlea, auditory nerve, or in the cerebral cortex Etiology Infections–especially intrauterine, eg rubella, drug toxicity, eg aminoglycosides, and tumors, eg acoustic neuroma
Mixed HL due to a combination of mechanical and neural defects Etiology Down syndrome, cystic fibrosis, cerebral palsy
having the quality of readily conducting electric current.
flooring or floor covering made specially conductive to electrical current, usually by the inclusion of copper wiring that is earthed externally.
conveyance of energy, as of heat, sound or electricity.
accessory tract atrioventricular conduction
permits a sinus impulse from the atria to ventricles to precede that carried by the normal atrioventricular conduction system. Arrhythmia results, the particular electrocardiographic characteristics depending on the pathway(s) involved. See also wolff-parkinson-white syndrome.
aerial conduction, air conduction
conduction of sound waves to the organ of hearing through the air.
local anesthesia produced by the injection of an anesthetic agent close to a nerve in order to prevent transmission of nerve impulses along it.
conduction of sound waves to the inner ear through the bones of the skull.
abnormalities in the conduction pathways of the heart.
James accessory conduction
see james fibers.
the system comprises the sinoatrial and atrioventricular nodes, atrioventricular bundle and Purkinje fibers.
an indicator of a peripheral nerve's ability to carry an impulse; measured during electromyography. A nerve that has undergone Wallerian degeneration is unable to carry an impulse. Severe loss of myelin results in a prolonged conduction time.