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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

conductive

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 ?
EMI shields made from either conductively painted plastic or soldered sheet
Therefore, in the case of the same surroundings temperature the droplet mass average temperature is always higher in combined heating case than for conductively heated droplets independently of the sprayed water temperature (Fig.
Likewise, the thermal conductivity of conductively filled systems increased upon the small addition of the ICP-coated carbon blacks (refs.
The Electriplast Polymer is a patent pending, compounded, pelletized formulation of resin-based materials, which are conductively loaded or doped with a proprietary controlled, balanced concentration of micron conductive materials contained within the manufactured pellet.
The new BLM family member represents the industry's smallest footprint and highest power conductively cooled product.
Oclaro developed a conductively cooled 9xx nm laser diode bar primarily designed for QCW pumping of miniaturized solid state lasers, which is what Pantec required for its P.
6,096,982 entitled "Method and Apparatus For Conductively Joining Components" was issued on August 1, 2000.
These new conductively cooled laser diode bars deliver very-high brightness in the 9xx nm to 10xx nm range, simplifying the design and reducing the overall costs for equipment in multi-kilowatt high brightness direct diode applications, fiber laser pumping, medical and industrial manufacturing applications.
We now offer one-stop shopping for rapid prototypes, quickcast molds, conductively cooled mold inserts along with traditional single and multicavity injection molds.
For 808nm laser diodes on conductively cooled standard CS type assembly up to 580W were measured at 500us and about 1 % duty cycle.