4/30/2013

Saving Savors

PITTSBURGH (AP) Four Pittsburgh firefighters are suing seven companies that manufacture fire trucks or sirens, claiming they've lost hearing due to the blaring sirens.

The firefighters range in age from 38 to 62 and joined the city's fire bureau between 1975 and 2000.
They're claiming that Mack Trucks Inc., Seagrave Fire Apparatus LLC and five other firms "knew or should have known the products ... were inherently dangerous, defective and hazardous to human hearing."

The men claim they've suffered irreversible hearing loss "due to exposure to the intense noise."
The firefighters are seeking unspecified monetary damages and are not suing the city.

They contend the manufacturers should have insulated the sirens to protect their hearing and/or provided warnings about their use.     Read more:
All told, seven companies are listed as defendants in the suit, which is seeking unspecified monetary damages.

American Lafrance, E-One Inc., Kovatch Mobile Equipment Corp., Mack Trucks Inc., Pierce Manufacturing Inc., Seagrave Fire Apparatus and Federal Signal Corp. were the companies whose trucks allegedly damaged the firefighters' ears.
Given the timespan that most of the plaintiffs have worked for the city, their  problems appear to stem from a series of different trucks that they have used during their careers and not just one make or model.

The lawsuit asserts that the manufacturers could have- and should have- insulated the sirens in order to protect the hearing of people around them, or issued warnings advising them of the health risks.

THE SCIENCE OF HAIR CELL REGENERATION
Tiny cells called hair cells are located in the inner ears of birds and mammals, and are required for normal hearing. They are called hair cells because they actually resemble the hairs on your head. These cells convert sound information into electrical signals that are sent to the brain. Once hair cells die in mammals - including humans - hearing loss is permanent.

Many types of commonly acquired hearing loss are the result of damage or death to these delicate hair cells, including noise-induced hearing loss, presbycusis (age-related hearing loss), and ototoxic hearing loss (hearing loss that occurs after a patient is exposed to certain life-saving but toxic medications).

In the late 1980s, both Dr. Edwin Rubel (then at the University of Virginia and now at the University of Washington) and Dr. Douglas Cotanche (then at the University of Pennsylvania and now at the Harvard School of Public Policy) discovered that even after chickens' hair cells had been deliberately destroyed in their labs, the cells grew back. Dr. Cotanche's work was funded by Hearing Health Foundation.

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