The effect of optokinetic and galvanic vestibular stimulations in reducing post-stroke postural asymmetry.

OBJECTIVE: To investigate the postural effect of 2 types of sensory stimulation in patients with a left hemispheric lesion (LHL) or right hemispheric lesion (RHL) compared with controls. METHODS: 35 patients (18 LHL, 17 RHL) and 27 controls (mean age 54.1 years), with a mean delay post-stroke of 3.0 months were enrolled. Subjects stood on a force platform and were stimulated on the left and right side by optokinetic (Okn) and galvanic vestibular (Gv) stimulation. Lateral displacement following stimulation toward the right and left directions was calculated as the mean position of the centre of pressure (CP) during the stimulation period minus the mean position at rest. RESULTS: Postural asymmetry was reduced in LHL and RHL patients. CP displacement was higher in cases of left-sided stimulation in the RHL group compared with control subjects and LHL patients (respectively 2.8 and 2.4 times higher, group effect, p<0.001, group × direction of stimulation interaction, p=0.007). The magnitude of displacement under Okn significantly correlated with Gv in all cases (ρ=0.635, p<0.001). CONCLUSIONS: Both GV and Okn stimulations can modulate hemiparetic's CP and their postural effects are correlated. SIGNIFICANCE: Results support a high level cortical postural effect of sensory stimulation on supramodal spatial network.

Motor strategies of postural control after hemispheric stroke.

After stroke, the causes of balance disorders include motor disorders, sensory loss, perceptual deficits and altered spatial cognition. This review focuses on motor strategies for postural control after stroke. Weight-bearing asymmetry, smaller surface of stability, increased sway, body tilting and sometimes pushing syndrome are observed. Weakness and sensory impairments account only for some of these disturbances; altered postural reactions and anticipated postural adjustments as well as abnormal synergistic muscular activation play an important part. These disorders are often linked to cognitive impairments (visuospatial analysis, perception of verticality, use of sensory information, attention, etc.), which explain the preeminent disorders of postural control seen with right rather than left-hemisphere lesions. Most of the motor changes are due to an impaired central nervous system but some could be considered adaptive behaviors. These changes have consequences for rehabilitation and need further studies for building customized programs based on the motor comportment of a given patient.

Walking with eyes closed is easier than walking with eyes open without visual cues: The Romberg task versus the goggle task.

BACKGROUND: The Romberg test, with the subject standing and with eyes closed, gives diagnostic arguments for a proprioceptive disorder. Closing the eyes is also used in balance rehabilitation as a main way to stimulate neural plasticity with proprioceptive, vestibular and even cerebellar disorders. Nevertheless, standing and walking with eyes closed or with eyes open in the dark are certainly 2 different tasks. We aimed to compare walking with eyes open, closed and wearing black or white goggles in healthy subjects. METHODS: A total of 50 healthy participants were randomly divided into 2 protocols and asked to walk on a 5-m pressure-sensitive mat, under 3 conditions: (1) eyes open (EO), eyes closed (EC) and eyes open with black goggles (BG) and (2) EO, EO with BG and with white goggles (WG). Gait was described by velocity (m·s(-1)), double support (% gait cycle), gait variability index (GVI/100) and exit from the mat (%). Analysis involved repeated measures Anova, Holm-Sidak's multiple comparisons test for parametric parameters (GVI) and Dunn's multiple comparisons test for non-parametric parameters. RESULTS: As compared with walking with EC, walking with BG produced lower median velocity, by 6% (EO 1.26; BG 1.01 vs EC 1.07 m·s(-1), P=0.0328), and lower mean GVI, by 8% (EO 91.8; BG 66.8 vs EC 72.24, P=0.009). Parameters did not differ between walking under the BG and WG conditions. CONCLUSION: The goggle task increases the difficulty in walking with visual deprivation compared to the Romberg task, so the goggle task can be proposed to gradually increase the difficulty in walking with visual deprivation (from eyes closed to eyes open in black goggles).

Lack of repercussions of sleep apnea syndrome on recovery and attention disorders at the subacute stage after stroke: a study of 45 patients.

INTRODUCTION: Sleep apnea syndrome (SAS) frequently occurs after a stroke. Its association with a poor prognosis is open to discussion. OBJECTIVE: To study, in a physical and rehabilitation medicine (PRM) unit, the possible repercussions of SAS on neurological and functional recovery as well as attentional abilities following a stroke. PATIENTS AND METHODS: Forty-five patients, all of whom had recently had a stroke without previously documented SAS, were screened using the ApneaLink(®) system. An apnea-hypopnea index (AHI) score ≥10 was considered as indicative of SAS. The NIHSS, Fugl-Meyer (FM) and Functional Independence Measure (FIM) Scales were applied on admission and at two months as means of assessing neurological and functional recovery, which was expressed by the difference between the first and the second scores (delta FM, delta NIHSS, delta FIM). The Battery Attention William Lennox (BAWL) Test was given once in order to evaluate attention disorders. SAS severity was categorized according to the AHI. We compared the groups formed (mild, moderate and severe) using the same method. RESULTS: Twenty-eight patients (62.2%) presented AHI ≥ 10. Stroke characteristics were comparable in the SAS+ and the SAS- groups, with average post-stroke time lapse of 26 days, initial average FIM score of 71.2 points ± 26.3 and initial average NIHSS score of 8.9 ± 4.9. The demographic characteristics of the two groups were likewise comparable with the exception of age, as the SAS+ group was pronouncedly older (65.4 vs. 53.5 years). As for delta FIM, which evaluated functional recovery, it averaged 31.8 ± 20.6. Cases of SAS were found to be mild (37.1%), moderate (28.6%) or severe (34.3%). No significant difference was observed on admission or at 2 months as regards the clinical scales or the BAWL test between the two groups or according to severity, except for the NIHSS score at 2 months in the severe sub-group. DISCUSSION AND CONCLUSION: This study did not demonstrate the supposed repercussions of SAS on the recovery or attentional abilities of post-stroke patients. The tests were maybe given too early; they should take place at a lengthier time interval after the stroke, and also to be more complete.

Poliomyelitis sequels in France and the clinical and social needs of survivors: a retrospective study of 200 patients.

INTRODUCTION: Polio survivors in France are estimated at 50,000. This study aimed at describing their needs from their clinical and vocational conditions. METHOD: A retrospective study of our physical and rehabilitation medicine (PRM) consultation activity. RESULTS: One hundred and fifteen women/85 men, with a mean age of 51years±14.3 (17 to 82). Paralysis involved only one lower limb in 108 patients, the two lower limbs in 56 patients and only one upper limb in 4. At the time of the first consultation 137 patients had experienced functional worsening. The complaints were pain (105 subjects), fatigue (59) and new paresis (58). Only 25% had retired. Post-polio syndrome criteria were present in 46 subjects (23%). Patients who had contracted poliomyelitis in France (56%) differed from the other subjects with regard to age (58.4 versus 41.5), professional status and frequency of PPS (30.9% versus 12.6%). CONCLUSION: These polio survivors were not particularly aged and they had often experienced functional worsening. The evolution of their disease shall represent a public health issue over the decades to come.

Sensory reweighting in controls and stroke patients.

OBJECTIVE: To test sensitivity to proprioceptive, vestibular and visual stimulations of stroke patients with regard to balance. METHOD: The postural control of 20 hemiparetic patients after a single hemispheric stroke that had occurred at least 6 months before the study along with 20 controls was probed with vibration, optokinetic, and vestibular galvanic stimulations. Balance was assessed using a force platform (PF) with two miniature inertial sensors placed on the head (C1) and the trunk (C2) under each sensory condition and measured by three composite scores as the mean displacement of the body (PF, C1, C2) during the stimulation. A subject with a composite score greater than the 75th percentile of the composite scores found in the control subjects was arbitrarily considered to be sensitive to that stimulation. RESULTS: Both control and stroke patients showed large inter-individual variations in response to the three types of sensory stimulation. Among the hemiparetic patients, nearly 65% were sensitive to the optokinetic stimulation, 60% to the galvanic stimulation and 65% to the vibration stimulation. In contrast to the control group, all the hemiparetic subjects were sensitive to at least one type of stimulation. CONCLUSION: Stroke patients are highly dependent on visual, proprioceptive and vestibular information in order to control their standing posture and individually differ in their relative sensitivity to each type of sensory stimulation. SIGNIFICANCE: Contrarily to what one might suppose, the increased visual dependence manifested by stroke patients does not necessarily entail any neglect of proprioceptive and vestibular information.

Care pathways in physical and rehabilitation medicine (PRM): the patient after proximal humeral fracture and shoulder hemi-arthroplasty.

This document is part of the "Care Pathways in Physical and Rehabilitation Medicine" series developed by the French Physical and Rehabilitation Medicine Society (Sofmer) and the French Physical and Rehabilitation Medicine Federation (Fedmer). For a given patient profile, each concise document describes the patient's needs, the care objectives in physical and rehabilitation medicine, the required human and material resources, the time course and the expected outcomes. The document is intended to enable physicians, decision-makers, administrators and legal and financial specialists to rapidly understand patient needs and the available care facilities, with a view to organizing and pricing these activities appropriately. Here, patients with acute proximal humeral fracture requiring shoulder hemi-arthroplasty are classified into four care sequences and two clinical categories, both of which are treated according to the same six parameters and by taking account of personal and environmental factors (according to the WHO's International Classification of Functioning, Disability and Health) that may influence patient needs.

Care pathways in physical and rehabilitation medicine (PRM): the patient after shoulder stabilization surgery.

This document is part of the "Care pathways in physical and rehabilitation medicine" series developed by the French Physical and Rehabilitation Medicine Society (SOFMER) and the French Physical and Rehabilitation Medicine Federation (FEDMER). For a given patient profile, each concise document describes the patient's needs, the care objectives in physical and rehabilitation medicine, the required human and material resources, the time course and the expected outcomes. The document is intended to enable physicians, decision-makers, administrators and legal and financial specialists to rapidly understand patient needs and the available care facilities, with a view to organizing and pricing these activities appropriately. Here, patients with shoulder instability requiring surgical stabilization are classified into five care sequences and two clinical categories, each of which are treated according to the same six parameters and by taking account of personal and environmental factors (according to the WHO's International Classification of Functioning, Disability and Health) that may influence patient needs.

Physical and rehabilitation medicine (PRM) care pathways: "spinal cord injury".

This document is part of a series of documents designed by the French Physical and Rehabilitation Medicine Society (SOFMER) and the French Federation of PRM (FEDMER). These documents describe the needs for or a specific type of patients; PRM care objectives, human and material resources to be implemented, chronology as well as expected outcomes. "Care pathways in PRM" is a short document designed to enable the reader (physicians, decision-maker, administrator, lawyer or finance manager) to quickly apprehend the needs of these patients and the available therapeutic care structures for proper organization and pricing of these activities. The patients after spinal cord injury are divided into five categories according to the severity of the impairments, each one being treated according to the same six parameters according to the International Classification of Functioning, Disability and Health (WHO), while taking into account personal and environmental factors that could influence the needs of these patients.

Physical and rehabilitation medicine (PRM) care pathways: "patients after knee ligament surgery".

This document is part of a series of documents designed by the French Physical and Rehabilitation Medicine Society (Sofmer) and the French Federation of PRM (Fedmer). These documents describe the needs for or a specific type of patients; PRM care objectives, human and material resources to be implemented, chronology as well as expected outcomes. "Care pathways in PRM" is a short document designed to enable the reader (physicians, decision-maker, administrator, lawyer or finance manager) to quickly apprehend the needs of these patients and the available therapeutic care structures for proper organization and pricing of these activities. Patients after knee ligament surgery are classified into four care sequences and two clinical categories, taking into account personal and environmental factors that could influence patients' needs, in accordance with the International Classification of Functioning (WHO).

Physical and rehabilitation medicine (PRM) care pathways: "stroke patients".

This document is part of a series of documents designed by the French Physical and Rehabilitation Medicine Society (SOFMER) and the French Federation of PRM (FEDMER). These documents describe the needs for a specific type of patients; PRM care objectives, human and material resources to be implemented, chronology as well as expected outcomes. "Care pathways in PRM" is a short document designed to enable the reader (physicians, decision-maker, administrator, lawyer or finance manager) to quickly apprehend the needs of these patients and the available therapeutic care structures for proper organization and pricing of these activities. Stroke patients are divided into four categories according to the severity of the impairments, each one being treated according to the same six parameters according to the International Classification of Functioning, Disability and Health (WHO), while taking into account personal and environmental factors that could influence the needs of these patients.

Physical and rehabilitation medicine (PRM) care pathways: "patients after rotator cuff tear surgery".

This document is part of a series of documents designed by the French Physical and Rehabilitation Medicine Society (Sofmer) and the French Federation of PRM (Fedmer). These documents describe the needs for or a specific type of patients; PRM care objectives, human and material resources to be implemented, chronology as well as expected outcomes. "Care pathways in PRM" is a short document designed to enable the reader (physicians, decision-maker, administrator, lawyer or finance manager) to quickly apprehend the needs of these patients and the available therapeutic care structures for proper organization and pricing of these activities. Patients after rotator cuff tear surgery are classified into four care sequences and two clinical categories, taking into account personal and environmental factors that could influence patients' needs, in accordance with the International Classification of Functioning (ICF) (WHO).

Managing spasticity with drugs.

Spasticity is a common symptom observed after pyramidal system lesion. The treatment of spasticity has considerably changed during last years, notably with the generalization of Botulinum toxin use. However, the treatment of spasticity should consider all therapeutic possibility in accordance with patient status and objective. Drugs are only a part of the treatment and physical therapy must always be used. Others treatments such as surgery, orthosis, occupational therapy must also be discussed individually. Several guidelines are now available for Botulinum toxin treatment but only the French guidelines consider all drug therapies. This review addresses the different drugs commonly used on the basis of an extensive review of literature. Some facts are clearly established by randomized controlled trials but a certain number of questions remains unclear and only clinical experience and consensus can guide injectors.

Post-polio syndrome: Pathophysiological hypotheses, diagnosis criteria, drug therapy.

Post-polio syndrome (PPS) refers to a clinical disorder affecting polio survivors with sequelae years after the initial polio attack. These patients report new musculoskeletal symptoms, loss of muscular strength or endurance. PPS patients are tired, in pain and experience new and unusual muscular deficits, on healthy muscles as well as deficient muscles initially affected by the Poliovirus. Once a clinical diagnosis is established, the therapeutic options can be discussed. Some pathophysiological mechanisms have been validated by research studies on PPS (inflammatory process in cerebrospinal fluid [CSF] and cytokines of the immune system). Several studies have been conducted to validate medications (pyridostigmine, immunoglobulin, coenzyme Q10) or physical exercises protocols. This article focuses on the relevance and efficacy that can be expected from these therapeutics. Very few studies reported some improvements. Medications combined to individual and supervised exercise training programs are promising therapeutic strategies for PPS patients care management.

Influence of subjective visual vertical misperception on balance recovery after stroke.

BACKGROUND: Subjective visual vertical (SVV) perception can be perturbed after stroke, but its effect on balance recovery is not yet known. AIM: To evaluate the influence of SVV perturbations on balance recovery after stroke. METHODS: 28 patients (14 with a right hemisphere lesion (RHL) and 14 with a left hemisphere lesion (LHL)) were included, 5 were lost to follow-up. SVV perception was initially tested within 3 months after stroke, then at 6 months, using a luminous line, which the patients adjusted to the vertical position in a dark room. Mean deviation (V) and uncertainty (U), defined as the standard deviation of the SVV, were calculated for eight trials. Balance was initially assessed by the Postural Assessment Scale for Stroke (PASS), and at 6 months by the PASS (PASS6), a force platform (lateral and sagittal stability limits (LSL6 and SSL6)), the Rivermead Mobility Index (RMI6) and gait velocity (v6). Functional outcome was also assessed by the Functional Independence Measure at 6 months (FIM6). RESULTS: The scores for balance and for FIM6 were related to the initial V value: PASS6 (p = 0.01, tau = -0.38); RMI6 (p = 0.002, tau = -0.48), LSL6 (p = 0.06, tau = -0.29), SSL6 (p = 0.004, tau = -0.43), v6 (p = 0.01, tau = -0.36) and FIM6 (p = 0.001, tau = -0.49), as well as to the initial U value: PASS6 (p = 0.03, tau = -0.32), RMI6 (p = 0.02, tau = -0.35), SSL6 (p = 0.005, tau = -0.43) and FIM6 (p = 0.01, tau = -0.38). CONCLUSIONS: Initial misperception of verticality was related to a poor score for balance after stroke. This relationship seems to be independent of motricity and neglect. Rehabilitation programmes should take into account verticality misperceptions, which could be an important factors influencing balance recovery after stroke.

Evolution of subjective visual vertical perturbation after stroke.

OBJECTIVE: The perception of visual verticality is often perturbed after stroke and might be an underlying component of imbalance. The aim of this study was to describe the evolution of visual vertical (VV) perturbation and to investigate the factors affecting it. METHODS: Thirty patients with hemiplegia after a single hemispheric stroke (17 left lesioned [LL] and 13 right lesioned [RL]) were studied. Visual verticality was tested within 45 days of stroke, and then at 3 and 6 months. Subjects sat in a dark room and adjusted a luminous rod to the vertical position. The differences between patients' adjustments and vertical were calculated. The effects on VV evolution of the side, size, type, and location of the lesion were tested. RESULTS: Sixty percent of the recent stroke patients had an initial inaccurate perception of verticality, and 39% of these patients recovered during the 1st 3 months after stroke. The evolution of VV tilt depended on the side of the lesion (P = 0.01), with better recovery in LL patients. None of the other factors studied affected VV normalization. CONCLUSIONS: The poorer recovery of vertical perception after right-side stroke might be due to the predominant role of the right hemisphere in spatial cognition, and might be involved in the poorer recovery of balance after stroke in RL patients.