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PubMed1997

Age-related hearing loss: a case for nursing intervention.

This review paper selectively examines the problem of age-related hearing loss. Drawing on specialist audiological research, nursing research and patient anecdotes to make a case for nursing intervention. The limitations of national prevalence estimates are highlighted with regard to dependent elderly people, and are challenged as political underestimations of need. Despite the evidence of an exceptionally high level of potential demand only a minority of elderly people who might benefit from amplification possess a hearing aid. Factors to explain the low levels of hearing aid ownership and use are discussed. Through considerable reference to the author's own research the potential for nurses to lead practice developments and initiate service reform in the management of age-related hearing loss is debated.

Aged↗
PubMed1998

Quinine reduces the dynamic range of the human auditory system.

The aim of the study was to evaluate and quantify quinine-induced changes in the human auditory dynamic range, as a model for cochlear hearing loss. Six otologically normal volunteers (21-40 years old) received quinine hydrochloride (15 mg/kg body weight) in two identical oral doses and one intravenous infusion. Refined hearing tests were performed monaurally at threshold, at moderate hearing levels and at high hearing levels. Quinine induced a maximal pure-tone threshold shift of 23 dB (1000-2000 Hz). The increase in the psychoacoustical click threshold agreed with an increase in the detection threshold of click-evoked otoacoustic emissions. The change in the stimulus-response relationship of the emissions reflected recruitment. The self-attained most comfortable speech level and the acoustic stapedius reflex thresholds were not affected by quinine administration. Quinine is a useful model substance for reversibly inducing complete loudness recruitment in humans as it acts specifically on some parts of the hearing function. Its mechanism of action on the molecular level is likely to reveal further information on the physiology of hearing.

Administration, Oral↗