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hearing loss of aging

Presbycusis 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.

conductive flooring
flooring or floor covering made specially conductive to electrical current, usually by the inclusion of copper wiring that is earthed externally.

conduction, conductive

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.
conduction anesthesia
local anesthesia produced by the injection of an anesthetic agent close to a nerve in order to prevent transmission of nerve impulses along it.
bone conduction
conduction of sound waves to the inner ear through the bones of the skull.
conduction disorder
abnormalities in the conduction pathways of the heart.
James accessory conduction
conduction system
the system comprises the sinoatrial and atrioventricular nodes, atrioventricular bundle and Purkinje fibers.
Enlarge picture
Conduction system of the heart. By permission from Cunningham JG, Textbook of Veterinary Physiology, Saunders, 2002
conduction time
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.
References in periodicals archive ?
6 Industry Trends 7 Thermally Conductive Plastic Market, By Raw Material 8 Thermally Conductive Plastic Market, By End-Use Industry 9 Thermally Conductive Plastic Market, By Region 10 Competitive Landscape11 Company Profiles
The global conductive carbon black market is consolidated with a few major players and the trend is expected to continue over the next five to eight years.
Nickel-coated graphite (Novamet Company), epoxy resin (Araldite GZ471-X75, Huntsman Company), and its polyamine hardener (Aradur 283, Huntsman Company) were also used to evaluate the effect of conductive filler and resin type on the electrical resistivity of nanoclay conductive coatings.
According to Susan Eustis, the principal author of the study, The advantage of transparent conductive film is that a very thin layer of material as a coating on a surface can provide touch screen capability.
Polymer blends including between 1520 percent of intrinsically conductive polymers (ICPs) and 85-80 percent of a low melting polymer such as polyethylene or polypropylene.
Second, the specific kinds of conductive coatings favored by several of the underlying electronics markets are shifting.
Silver epoxy is the most common conductive epoxy used in shielding and plane applications on flex circuits.
The faces of MDF panels are very smooth, and often sufficiently smooth that priming prior to powder coating is not necessary, provided that MDF is suitably conductive at the time of coating.
Product components accounted for 57 percent of all conductive polymer applications in 2005.
Aluminum and P20 tool steel aren't conductive enough.
To help commemorate the anniversary, centres across the country have designated March 11-19 as Conductive Education Awareness Week to highlight its benefits for physically disabled children and adults.
The Sylon[R] electrically conductive adhesive solders from Devcon can be used to form conductive paths in applications where hot soldering would be ineffective or impractical.