http://nnr.sagepub.com/content/30/1/9?etoc
- Celine Piscicelli, MS1,2
- Julien Barra, PhD3
- Brice Sibille, MS1
- Charlotte Bourdillon1
- Michel Guerraz, PhD4
- Dominic Alain Pérennou, MD, PhD1,2⇑
- 1Grenoble University Hospital, Grenoble, France
- 2Grenoble-Alpes University, Grenoble, France
- 3Paris Descartes University, Paris, France
- 4Savoie University, Chambéry, France
- Dominic Alan Pérennou, Clinique MPR-CHU, Laboratoire de Psychologie et Neurocognition CNRS UMR 5105, Grenoble Université, Avenue de Kimberley, Grenoble 38000, France. Email: DPerennou@chu-grenoble.fr
Abstract
Background. Visual vertical (VV)
measurement provides information about spatial cognition and is now part
of postural disorders assessment.
Guidelines for clinical VV measurement after stroke
remain to be established, especially regarding the orientation settings
for patients who do not sit upright.
Objectives. We analyzed the need to control body orientation while patients estimate the VV. Methods.
VV orientation and variability were assessed in 20 controls and 36
subacute patients undergoing rehabilitation after a first
hemisphere stroke, in 3 settings: body not
maintained (trunk and head free), partially maintained (trunk
maintained, head
free), or maintained (trunk and head). VV was
analyzed as a function of trunk and head tilt, also quantified. Results.
Trunk and head orientations were independent. The ability to sit
independently was affected by a tilted trunk. The setting
had a strong effect on VV orientation and
variability in patients with contralesional trunk tilt (n = 11; trunk
orientation
−18.4 ± 11.7°). The contralesional VV bias was
severe and consistent under partially maintained (−8.4 ± 5.2°) and
maintained
(−7.8 ± 3.5°) settings, whereas various individual
behaviors reduced the mean bias under the nonmaintained setting (−3.6 ±
9.3°, P < .05). VV variability was lower under the maintained (1.5 ± 0.2°) than nonmaintained (3.7 ± 0.4°, P < .001) and partially maintained (3.6 ± 0.2°, P < .001) settings. In contrast, setting had no effect in patients with satisfactory postural control in sitting.
Conclusion.
Subject setting improves VV measurement in stroke patients with
postural disorders. Maintaining the trunk upright enhances
the validity of VV orientation, and maintaining the
head upright enhances the validity of within-subject variability.
Measuring
VV without any body maintaining is valid in
patients with satisfactory balance abilities.
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