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How To Prevent Vertigo While Scuba Diving

BY JAMES L. CARUSO

Q: I sometimes experience vertigo while diving. Can I prevent this?

A: Vertigo is the feeling that the world around you is moving, spinning or tilting while you are remaining essentially still. Vertigo can be a result of a number of ailments, ranging from an infection in the inner ear to chronic problems such as Meniere’s disease.

Vertigo is not uncommon among divers, and your experience with it occurring when you are at significant depth is fairly typical. Diving physics tells us that the greatest pressure changes occur closer to the surface, but as the diver descends, equalizing the pressure in the middle ear is still very important. Divers generally continue to descend even when having difculty with equalizing. Plus, the middle ears need to equalize during ascent as well.

You are experiencing alternobaric vertigo, which is caused by unequal pressures between your middle-ear compartments. The pressure diference does not have to be very great. The inequality is communicated to the inner ear organs, resulting in vertigo. Divers can also experience nausea and vomiting. Vertigo is usually more common while a diver ascends. Not only are the symptoms uncomfortable, but they also can lead to catastrophic problems for the diver. Vertigo can also occur when diving with a hood if one side of the hood seals over the ear tighter than the other.

Prevention of vertigo during diving requires careful, gradual and continuous equalization of the pressures within the middle ear throughout the dive.

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