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Disturbances in equilibrium function after major earthquake.

Honma M, Endo N, Osada Y, Kim Y, Kuriyama K - Sci Rep (2012)

Bottom Line: Major earthquakes were followed by a large number of aftershocks and significant outbreaks of dizziness occurred over a large area.Equilibrium dysfunction in the aftershock-exposed group appears to have arisen from disturbance of the inner ear, as well as individual vulnerability to state anxiety enhanced by repetitive exposure to aftershocks.We indicate potential effects of autonomic stress on equilibrium function after major earthquake.

View Article: PubMed Central - PubMed

Affiliation: Department of Adult Mental Health, National Institute of Mental Health, National Center of Neurology and Psychiatry, 4-1-1 Ogawa-Higashi, Kodaira, Tokyo 187-8553, Japan. mhonma@ncnp.go.jp

ABSTRACT
Major earthquakes were followed by a large number of aftershocks and significant outbreaks of dizziness occurred over a large area. However it is unclear why major earthquake causes dizziness. We conducted an intergroup trial on equilibrium dysfunction and psychological states associated with equilibrium dysfunction in individuals exposed to repetitive aftershocks versus those who were rarely exposed. Greater equilibrium dysfunction was observed in the aftershock-exposed group under conditions without visual compensation. Equilibrium dysfunction in the aftershock-exposed group appears to have arisen from disturbance of the inner ear, as well as individual vulnerability to state anxiety enhanced by repetitive exposure to aftershocks. We indicate potential effects of autonomic stress on equilibrium function after major earthquake. Our findings may contribute to risk management of psychological and physical health after major earthquakes with aftershocks, and allow development of a new empirical approach to disaster care after such events.

No MeSH data available.


Related in: MedlinePlus

Earthquakes.(a) Locations of the epicenter of the Tohoku earthquake, the sampled areas of Tokyo and Osaka, and the most affected areas of Iwate, Miyagi, and Fukushima. The distances from the epicenter to Tokyo and Osaka are approximately 350 and 700 km, respectively. The transparent circles indicate the geographic areas within which the members of each group resided. (b) Number of aftershocks per week from March 11, 2011 to July 6, 2011 in Tokyo (Quake group) and Osaka (Control group) recorded more than Shindo level 2.
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f1: Earthquakes.(a) Locations of the epicenter of the Tohoku earthquake, the sampled areas of Tokyo and Osaka, and the most affected areas of Iwate, Miyagi, and Fukushima. The distances from the epicenter to Tokyo and Osaka are approximately 350 and 700 km, respectively. The transparent circles indicate the geographic areas within which the members of each group resided. (b) Number of aftershocks per week from March 11, 2011 to July 6, 2011 in Tokyo (Quake group) and Osaka (Control group) recorded more than Shindo level 2.

Mentions: Past major earthquakes have been associated with increased prevalence of psychiatric morbidities such as anxiety disorders1, mood disorders2, sleep disorders34, and posttraumatic stress disorder13 as well as neurological complaints such as dizziness5. The Tohoku earthquake on March 11 in 2011 (moment magnitude = 9.0, Shindo 7 [Japanese seismic scale: see Supplementary Table 1]) and the large numbers of aftershocks (Fig. 1) was no exception (Japan Meteorological Agency, 2011: The Shindo database searching, http://www.seisvol.kishou.go.jp/eq/shindo_db/shindo_index.html); several months after the initial earthquake, significant outbreaks of dizziness occurred over a large area surrounding the epicenter of the earthquake, including in Tokyo6.


Disturbances in equilibrium function after major earthquake.

Honma M, Endo N, Osada Y, Kim Y, Kuriyama K - Sci Rep (2012)

Earthquakes.(a) Locations of the epicenter of the Tohoku earthquake, the sampled areas of Tokyo and Osaka, and the most affected areas of Iwate, Miyagi, and Fukushima. The distances from the epicenter to Tokyo and Osaka are approximately 350 and 700 km, respectively. The transparent circles indicate the geographic areas within which the members of each group resided. (b) Number of aftershocks per week from March 11, 2011 to July 6, 2011 in Tokyo (Quake group) and Osaka (Control group) recorded more than Shindo level 2.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3475992&req=5

f1: Earthquakes.(a) Locations of the epicenter of the Tohoku earthquake, the sampled areas of Tokyo and Osaka, and the most affected areas of Iwate, Miyagi, and Fukushima. The distances from the epicenter to Tokyo and Osaka are approximately 350 and 700 km, respectively. The transparent circles indicate the geographic areas within which the members of each group resided. (b) Number of aftershocks per week from March 11, 2011 to July 6, 2011 in Tokyo (Quake group) and Osaka (Control group) recorded more than Shindo level 2.
Mentions: Past major earthquakes have been associated with increased prevalence of psychiatric morbidities such as anxiety disorders1, mood disorders2, sleep disorders34, and posttraumatic stress disorder13 as well as neurological complaints such as dizziness5. The Tohoku earthquake on March 11 in 2011 (moment magnitude = 9.0, Shindo 7 [Japanese seismic scale: see Supplementary Table 1]) and the large numbers of aftershocks (Fig. 1) was no exception (Japan Meteorological Agency, 2011: The Shindo database searching, http://www.seisvol.kishou.go.jp/eq/shindo_db/shindo_index.html); several months after the initial earthquake, significant outbreaks of dizziness occurred over a large area surrounding the epicenter of the earthquake, including in Tokyo6.

Bottom Line: Major earthquakes were followed by a large number of aftershocks and significant outbreaks of dizziness occurred over a large area.Equilibrium dysfunction in the aftershock-exposed group appears to have arisen from disturbance of the inner ear, as well as individual vulnerability to state anxiety enhanced by repetitive exposure to aftershocks.We indicate potential effects of autonomic stress on equilibrium function after major earthquake.

View Article: PubMed Central - PubMed

Affiliation: Department of Adult Mental Health, National Institute of Mental Health, National Center of Neurology and Psychiatry, 4-1-1 Ogawa-Higashi, Kodaira, Tokyo 187-8553, Japan. mhonma@ncnp.go.jp

ABSTRACT
Major earthquakes were followed by a large number of aftershocks and significant outbreaks of dizziness occurred over a large area. However it is unclear why major earthquake causes dizziness. We conducted an intergroup trial on equilibrium dysfunction and psychological states associated with equilibrium dysfunction in individuals exposed to repetitive aftershocks versus those who were rarely exposed. Greater equilibrium dysfunction was observed in the aftershock-exposed group under conditions without visual compensation. Equilibrium dysfunction in the aftershock-exposed group appears to have arisen from disturbance of the inner ear, as well as individual vulnerability to state anxiety enhanced by repetitive exposure to aftershocks. We indicate potential effects of autonomic stress on equilibrium function after major earthquake. Our findings may contribute to risk management of psychological and physical health after major earthquakes with aftershocks, and allow development of a new empirical approach to disaster care after such events.

No MeSH data available.


Related in: MedlinePlus