Noise and hypoxia induced temporary threshold shifts in rats studied by ABR

Attias, Joseph; Sohmer, Haim; Gold, Shlomit; Haran, Idit; Shahar, Amir

doi:10.1016/0378-5955(90)90124-8

Cited by 27 publications

(18 citation statements)

References 17 publications

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“…Both effects lasted for of 1 h after the noise exposure was finished. A complete recovery was reached after 3 h. Another study animals showed a temporary threshold shift after an isobaric exposure to 6% oxygen, which corresponds to an altitude of about 10 500 m (Attias et al, 1990). The finding that acclimatized animals showed significantly lesser hearing impairment supports the thesis of a combined effect of hypoxia and noise (Berndt et al, 1978).…”

Section: Discussionsupporting

confidence: 67%

Does Modern Helicopter Construction Reduce Noise Exposure in Helicopter Rescue Operations?

Küpper

Jansing

Schöffl

et al. 2012

The Annals of Occupational Hygiene

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Background: During helicopter rescue operations the medical personnel are at high risk for hearing damage by noise exposure. There are two important factors to be taken into account: first, the extreme variability, with some days involving no exposure but other days with extreme exposure; second, the extreme noise levels during work outside the helicopter, e.g. during winch operations. The benefit of modern, less noisier constructions and the consequences for noise protection are still unknown.Objectives Results and conclusions: Depending on modern technologies the situation for the personnel has been improved significantly. Nevertheless noise prevention, which includes noise intermissions in spare time, is essential. Medical checks of the crews by occupational medicine (e.g. 'G20' in Germany) are still mandatory.

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Section: Discussionsupporting

confidence: 67%

Does Modern Helicopter Construction Reduce Noise Exposure in Helicopter Rescue Operations?

Küpper

Jansing

Schöffl

et al. 2012

The Annals of Occupational Hygiene

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“…Noise-induced changes in the co chlear blood flow with consecutive metabolic alterations are discussed, as well as metabolic exhaustion as a result of cellular overstimulation. In rats exposed to industrial noise for 3 months, a decrease in cochlear blood flow detected by the microsphere method has been reported [ 18], Noise of 115 dB for 2 h. alone or in combination with controlled hypoxia, produced more severe hearing loss than controlled hypoxia alone [ 19]. These results point to a noise-induced cochlear metabolic disturbance or to a me chanical lesion producing hearing loss.…”

Section: Discussionmentioning

confidence: 44%

Morphologic Damage and Changes of Intracellular Calcium-Binding Sites after Acute Noise Trauma in the Organ of Corti of the Guinea Pig

Maurer¹,

Heinrich²,

Mann³

1993

ORL

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In guinea pigs, an acute acoustic trauma was created by 6 consecutive gunshots. The sound pressure at the ear drum was 156 ± 4 dB, the frequency maximum was between 4 and 6 kHz. Sixty hours after the noise trauma, the animals were decapitated, and the cochleae were prepared for microscopic analysis of the resulting trauma to the organ of Corti. During the process of fixation, the potassium-pyroantimonate precipitation reaction was performed to localize calcium-binding sites. The pattern of cell morphology and the distribution of calcium-binding sites was compared to that of normal control animals. Morphologic changes of the cells in the organ of Corti correlated with changes of the cellular calcium distribution, indicating the crucial role of calcium in cell damage and necrosis after acute noise trauma.

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“…Hypoxia is an independent risk factor for hearing threshold shifts, as an exposure to 5% oxygen induces such a reversible shift [19] that is less pronounced in acclimatized animals [20]. Humans show similar reactions at about 4500 m a.s.l.…”

Section: Noise Exposure During Ambulance Flights O R I G I N a L P A mentioning

confidence: 76%

Noise exposure during ambulance flightsand repatriation operations

Küpper¹,

Zimmer²,

Conrad³

et al. 2010

International Journal of Occupational Medicine and Environmental Health

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Objectives: Although ambulance flights are routine work and thousands of employees work in repatriation organizations, there is no data on noise exposure which may be used for preventive advice. We investigated the noise exposure of crews working in ambulance flight organizations for international patient repatriation to get the data for specific guidelines concerning noise protection. Material and Methods: Noise levels inside Learjet 35A, the aircraft type which is most often used for repatriation operations, were collected from locations where flight crews typically spend their time. A sound level meter class 1 meeting the DIN IEC 651 requirements was used for noise measurements, but several factors during the real flight situations caused a measurement error of ~3%. Therefore, the results fulfill the specifications for class 2. The data was collected during several real repatriation operations and was combined with the flight data (hours per day) regarding the personnel to evaluate the occupationally encountered equivalent noise level according to DIN 45645-2. Results and Conclusions: The measured noise levels were safely just below the 85 dB(A) threshold and should not induce permanent threshold shifts, provided that additional high noise exposure by non-occupational or private activities was avoided. As the levels of the noise produced by the engines outside the cabin are significantly above the 85 dB(A) threshold, the doors of the aircraft must be kept closed while the engines are running, and any activity performed outside the aircraft -or with the doors opened while the engines are running -must be done with adequate noise protection. The new EU noise directive (2003/10/EG) states that protective equipment must be made available to the aircrew to protect their hearing, though its use is not mandatory.

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Noise and hypoxia induced temporary threshold shifts in rats studied by ABR

Cited by 27 publications

References 17 publications

Does Modern Helicopter Construction Reduce Noise Exposure in Helicopter Rescue Operations?

Does Modern Helicopter Construction Reduce Noise Exposure in Helicopter Rescue Operations?

Morphologic Damage and Changes of Intracellular Calcium-Binding Sites after Acute Noise Trauma in the Organ of Corti of the Guinea Pig

Noise exposure during ambulance flightsand repatriation operations

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