Stroke Sequelae Clinical Trial
Official title:
Characterization and Understanding of the Mechanisms of Balance Disorders in a Seated Position Following a Stroke
One of the causes of disability in stroke patients is postural disturbances that result in
postural asymmetry in the standing position, characterized during an evaluation on a force
platform by a greater displacement of the center of pressure towards the lesion side and thus
by a greater percentage of weight on the lower limb (Weight -Bearing Asymmetry (WBA)). Today,
the mechanisms of balance disorders in standing position are better understood. Indeed, in
addition to sensory and motor deficits, spatial cognitive disorders also contribute to these
postural disturbances, particularly in right brain damage stroke. This would be the reason
why patients with right brain damage have a more precarious and time-consuming balance to
re-educate than patients with lesions located in the left hemisphere.
Postural disturbances can also result in a disturbance of balance in the sitting position,
which is a poor prognosis for the acquisition of transfers, standing and walking. To date,
seated postural disturbances are not perfectly described with many differences in the
explanatory mechanisms found in the literature. Thus, some people notice a more pronounced
asymmetry on the medio-lateral plane while others find a more pronounced imbalance at the
antero-posterior plane.
Sitting posture disorders benefit from few instrumental measurement tools outside clinical
measurement scales. A very wide variety of evaluation methods by instrumental measurements
are proposed and not validated. Sensor pad, which are usually used to adjust the bases of
pressure ulcer patients, may be useful in quantifying the postural balance. But since the
involvement of the head and trunk in the sitting posture is well documented in the
literature, the addition of an evaluation of the position of the trunk and head seems
essential. To our knowledge, no author has proposed to quantify sitting balance disorders by
combining a measure of support asymmetry by taking into account the posture of the trunk with
that of the head.
In France, stroke is the third leading cause of death and the first cause of acquired
disability in adults. Approximately 130,000 people suffer a stroke each year. On the other
hand, since the frequency of stroke is age-related, the aging of the population suggests that
the number of people with stroke will increase in the coming years.
One of the causes of disability in stroke patients is postural disturbances. These postural
disturbances cause a greater risk of falls and are a source of loss of autonomy for these
patients. In standing position, during evaluation on a force platform, these postural
disturbances can be characterized by postural asymmetry which results in a greater
displacement of the center of pressure on the lesion side and thus a greater percentage of
support on the lower limb non-paretic (Weight-Bearing Asymmetry (WBA)). Today, the mechanisms
of balance disorders in standing position are better understood. Indeed, in addition to
sensory and motor deficits, spatial cognitive disorders also contribute to these postural
disturbances, particularly in right brain damage stroke. Many authors agree on a localization
of spatial cognition and in particular the mental elaboration of the representation of the
body in space according to the different types of spatial frame at the level of the right
cerebral hemisphere. This would be the reason why patients with right brain damage have a
more precarious and time-consuming balance to rehabilitate than patients with lesions located
in the left hemisphere.
Postural disturbances can also result in a disturbance of balance in the sitting position.
The persistence of these disorders in a sitting position is a poor prognosis for the
acquisition of transfers, standing and walking. To date, the mechanisms of these postural
disturbances in the seated position in stroke patients have not been fully described. Indeed,
many discrepancies are found in the literature. Although it appears that for a majority of
authors, stroke patients have greater sitting asymmetry than healthy subjects, not all of
them are unanimous. Moreover, among these authors highlighting this asymmetry in the sitting
position, some note a more pronounced lateral plane while others find a more pronounced
imbalance in the antero-posterior plane. Apart from the motor and sensory deficit, the
postural asymmetry found in the sitting position could also be due to a spatial cognitive
disorder. The authors Au-Yeung et al showed a more pronounced deviation in patients with a
localized stroke in the right hemisphere. This result in relation to the relationship between
posturography data from the sitting position and the postural vertical suggests the
involvement of spatial cognition in balance disorders in the sitting position. However, since
the authors Van Nes et al did not find this result in their study, this hypothesis remains to
be confirmed.
Unlike standing posture disorders, which are commonly assessed by force platforms in
rehabilitation, sitting posture disorders benefit from few instrumental measurement tools
outside clinical measurement scales. In addition, in the literature, a very wide variety of
evaluation methods by instrumental measures are proposed and not validated. In some cases,
the patient was placed directly on the force platform, others chose to sit the patient on a
chair positioned on the platform. Initially, sensor pad are usually used to adapt the bases
of patients with pressure ulcers but they may be useful for quantifying the postural base.
However, the involvement of the head and trunk in the sitting posture is well documented in
the literature and the addition of an assessment of the trunk and head therefore seems
essential. To our knowledge, no author has studied sitting balance disorders in a quantified
way by taking into account both the posture of the trunk associated with the head and a
measurement of postural asymmetry.
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