Rare express saccades in elderly fallers

Q Yang1, T T Lê1, E Debay1, C Orssaud2, G Magnier3, Z Kapoula11Groupe IRIS Vision and Motricité Binoculaire, CNRS, Service d’Ophtalmologie-ORL-Stomatologie; 2Service d’Ophtalmologie, Hôpital Européen Georges Pompidou, Paris, France; 3H&am...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Q Yang, T T Lê, E Debay, C Orssaud, G Magnier, Z Kapoula
Formato:	article
Lenguaje:	EN
Publicado:	Dove Medical Press 2008
Materias:	Geriatrics RC952-954.6
Acceso en línea:	https://doaj.org/article/f8881efe3ef14ca082fa8c1b1e81828b
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:f8881efe3ef14ca082fa8c1b1e81828b
record_format	dspace
spelling	oai:doaj.org-article:f8881efe3ef14ca082fa8c1b1e81828b2021-12-02T04:17:04ZRare express saccades in elderly fallers1178-1998https://doaj.org/article/f8881efe3ef14ca082fa8c1b1e81828b2008-12-01T00:00:00Zhttps://www.dovepress.com/rare-express-saccades-in-elderly-fallers-peer-reviewed-article-CIAhttps://doaj.org/toc/1178-1998Q Yang1, T T Lê1, E Debay1, C Orssaud2, G Magnier3, Z Kapoula11Groupe IRIS Vision and Motricité Binoculaire, CNRS, Service d’Ophtalmologie-ORL-Stomatologie; 2Service d’Ophtalmologie, Hôpital Européen Georges Pompidou, Paris, France; 3Hôpital de gériatrie Henry Dunant, Paris, FranceObjective: To examine horizontal saccades in elderly subjects with falling history; prior extensive screening was done to recruit subjects with falling history in the absence of pathology.Methods: Twelve elderly with falling history were tested. Two testing conditions were used: the gap (fixation target extinguishes prior to target onset) and the overlap (fixation stays on after target onset) paradigms. Each condition was run at three viewing distances −20 cm, 40 cm, and 150 cm, corresponding to convergence angle at 17.1°, 8.6°, and 2.3°, respectively. Eye movements were recorded with the photoelectric IRIS (Skalar medical).Results: (i) like in healthy elderly subjects, elderly with falling history produce shorter latencies in the gap paradigm than in the overlap paradigm; (ii) their latencies are shorter at near distances (20 and 40 cm) relative to 150 cm for both paradigms; (iii) the novel result is that they fail to produce express latencies even in the conditions (near viewing distance and the gap task) known to promote high rates of express in adults (25%) or in healthy elderly (20%). Seven from the 10 healthy elderly produced express saccades at rates >12%, while 9 of the 12 older subjects with falling history showed no express saccades at all; the remaining 3 subjects showed low rates <12%.Conclusion: The quasi paucity of express saccades could be due to the disequilibrium of complex cortical/subcortical networks needed for making express saccades. The results support models suggesting specific network for express saccades; missing of such optomotor reflex may go along with missing other reflexes as well increasing the chances of falling.Keywords: elderly, falling, saccades, gap/overlap, express saccadeQ YangT T LêE DebayC OrssaudG MagnierZ KapoulaDove Medical PressarticleGeriatricsRC952-954.6ENClinical Interventions in Aging, Vol Volume 3, Pp 691-698 (2008)
institution	DOAJ
collection	DOAJ
language	EN
topic	Geriatrics RC952-954.6
spellingShingle	Geriatrics RC952-954.6 Q Yang T T Lê E Debay C Orssaud G Magnier Z Kapoula Rare express saccades in elderly fallers
description	Q Yang1, T T Lê1, E Debay1, C Orssaud2, G Magnier3, Z Kapoula11Groupe IRIS Vision and Motricité Binoculaire, CNRS, Service d’Ophtalmologie-ORL-Stomatologie; 2Service d’Ophtalmologie, Hôpital Européen Georges Pompidou, Paris, France; 3Hôpital de gériatrie Henry Dunant, Paris, FranceObjective: To examine horizontal saccades in elderly subjects with falling history; prior extensive screening was done to recruit subjects with falling history in the absence of pathology.Methods: Twelve elderly with falling history were tested. Two testing conditions were used: the gap (fixation target extinguishes prior to target onset) and the overlap (fixation stays on after target onset) paradigms. Each condition was run at three viewing distances −20 cm, 40 cm, and 150 cm, corresponding to convergence angle at 17.1°, 8.6°, and 2.3°, respectively. Eye movements were recorded with the photoelectric IRIS (Skalar medical).Results: (i) like in healthy elderly subjects, elderly with falling history produce shorter latencies in the gap paradigm than in the overlap paradigm; (ii) their latencies are shorter at near distances (20 and 40 cm) relative to 150 cm for both paradigms; (iii) the novel result is that they fail to produce express latencies even in the conditions (near viewing distance and the gap task) known to promote high rates of express in adults (25%) or in healthy elderly (20%). Seven from the 10 healthy elderly produced express saccades at rates >12%, while 9 of the 12 older subjects with falling history showed no express saccades at all; the remaining 3 subjects showed low rates <12%.Conclusion: The quasi paucity of express saccades could be due to the disequilibrium of complex cortical/subcortical networks needed for making express saccades. The results support models suggesting specific network for express saccades; missing of such optomotor reflex may go along with missing other reflexes as well increasing the chances of falling.Keywords: elderly, falling, saccades, gap/overlap, express saccade
format	article
author	Q Yang T T Lê E Debay C Orssaud G Magnier Z Kapoula
author_facet	Q Yang T T Lê E Debay C Orssaud G Magnier Z Kapoula
author_sort	Q Yang
title	Rare express saccades in elderly fallers
title_short	Rare express saccades in elderly fallers
title_full	Rare express saccades in elderly fallers
title_fullStr	Rare express saccades in elderly fallers
title_full_unstemmed	Rare express saccades in elderly fallers
title_sort	rare express saccades in elderly fallers
publisher	Dove Medical Press
publishDate	2008
url	https://doaj.org/article/f8881efe3ef14ca082fa8c1b1e81828b
work_keys_str_mv	AT qyang rareexpresssaccadesinelderlyfallers AT ttlecirc rareexpresssaccadesinelderlyfallers AT edebay rareexpresssaccadesinelderlyfallers AT corssaud rareexpresssaccadesinelderlyfallers AT gmagnier rareexpresssaccadesinelderlyfallers AT zkapoula rareexpresssaccadesinelderlyfallers
_version_	1718401345179877376

Rare express saccades in elderly fallers

Ejemplares similares