Do you wear your iPod when OUT in a thunder storm?

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A topic from Technology: iPod, MP3 and Digital Music Tech

stronghold_ukFri 13/07/07 09:58

From the New England Journal of Medicine:

To the Editor: The potential for permanent hearing loss due to prolonged use of personal stereo equipment, such as portable compact-disk or MP3 players, at high decibel levels has been well described in the literature. We have recently become aware of an additional, albeit uncommon, hazard associated with the use of such devices.

A 37-year-old man was brought to the emergency department at our hospital. He had been jogging in a thunderstorm, listening to his iPod, when an adjacent tree was struck by lightning. Witnesses reported that he was thrown approximately 8 ft (2.4 m) from the tree.

The patient had second-degree burns on his chest and left leg. In addition, two linear burns extended along his anterior chest and neck to the sides of his face, terminating in substantial burns in the external auditory meatus bilaterally, corresponding to the positions of his earphones at the time of the lightning strike. Both of his tympanic membranes were ruptured, and he had a severe conductive hearing deficit. He also had a mandibular fracture. Computed tomography of the mandible and of the temporal bones showed bilateral dislocation of the incudomalleolar joints. Internal fixation of the mandibular fractures was performed and the perforations of the tympanic membranes were managed with the use of perichondrial grafting.

Although people may be struck directly by lightning, it is more common for the lightning to jump to a person from a nearby object, such as a tree — a phenomenon known as a side flash. Opisthotonic muscle contraction may project the victim some distance, leading to further injury from blunt trauma. Because of the high resistance of skin, the lightning is often conducted over the outside of the body (an effect known as a flashover); however, sweat and metallic objects in contact with the skin can disrupt the flashover, leading to the internal flow of current. Although the use of a device such as an iPod may not increase the chances of being struck by lightning in this case, the combination of sweat and metal earphones directed the current to, and through, the patient's head. The mandibular fractures were probably caused by muscle contraction, since there were no external signs of injury to the face. The perforations of the tympanic membranes occurred as a result of the sudden heating and expansion of air around the current, leading to pressure waves. Perforations are commonly seen in patients who have been struck by lightning although ossicular injuries appear to be rare.

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