The association between contraversive lateropulsion and outcomes post stroke: A systematic review

The association between neuroimaging data and presence of lateropulsion after stroke

BACKGROUND

Post-stroke lateropulsion is prevalent and has been associated with varied lesion locations, but existing imaging studies are limited by small participant cohorts. Evidence to guide lateropulsion rehabilitation is also limited. Improved understanding of lesion localization associated with lateropulsion post-stroke may inform more targeted intervention approaches.

OBJECTIVES

This study investigated the associations between stroke neuroimaging data and presence of lateropulsion at inpatient rehabilitation admission.

METHODS

This prospective, observational study included participants aged ≥65 years, admitted for inpatient stroke rehabilitation. Using routinely collected clinical neuroimaging data, stroke type, location, and volume were reported, and their association with lateropulsion presence (Four-Point Pusher Score - 4PPS) at admission was explored.

RESULTS

Of 144 included participants, 82 (56.9%) had lateropulsion (4PPS ≥1). Lateropulsion presence was univariately associated with hemorrhagic stroke (p = 0.002), frontal cortical involvement (OR = 2.17, 95%CI 1.02-6.46), and white matter involvement (OR = 2.45, 95%CI 1.24-4.85), particularly frontal white matter (p = 0.021). Lesions involving the posterior limb of the internal capsule (OR = 2.88, 95% CI 1.14-7.27) and those involving the entire thalamus (OR = 1.0, p = 0.03) were associated with lateropulsion presence. When stratified by stroke type, no specific location was significantly associated with lateropulsion presence in hemorrhagic strokes. Among participants with ischemic stroke, involvement of the pre-central gyrus (OR = 2.45, 95%CI 1.05-5.76), post-central gyrus (OR = 2.76, 95%CI 1.15-6.60), inferior parietal cortex (OR = 3.95, 95%CI 1.43-10.90), and supramarginal gyrus (OR = 3.73, 95%CI 1.25-11.13) were associated with lateropulsion presence. The stroke laterality and size were not significantly associated with lateropulsion presence.

CONCLUSIONS

The findings indicate a role of network disconnection in the post-stroke lateropulsion presence. Future, larger-cohort lesion-network mapping studies are recommended.

Lateropulsion resolution and outcomes up to one year post-stroke: a prospective, longitudinal cohort study

BACKGROUND

Post-stroke lateropulsion is prevalent and associated with poor rehabilitation outcomes; however, data regarding long-term function associated with lateropulsion are lacking.

OBJECTIVES

This study aimed to explore lateropulsion resolution and associations between lateropulsion, functional outcomes, and fall occurrence up to 12 months post-stroke.

METHODS

Participants for this prospective, longitudinal cohort study were recruited from a Stroke Rehabilitation Unit (SRU). Assessments were conducted at SRU admission, at discharge, and at three, six, nine, and twelve months post-stroke. Outcomes included the Four-Point Pusher Score (4PPS), Functional Independence Measure (FIM), and fall occurrence. Longitudinal outcomes were modeled using generalized linear mixed-effects models.

RESULTS

The final analyses included data from 144 participants. Eighty-two participants (56.9) had lateropulsion (4PPS ≥ 1) on admission. Odds of resolved lateropulsion (4PPS = 0) increased longitudinally from discharge for people who participated in rehabilitation physiotherapy (OR: 9.7, 28.1, 43.1, 81.3: <0.001 at three, six, nine, and twelve months respectively). The greatest FIM improvement among participants in all 4PPS categories occurred during the SRU inpatient phase. The probability of falls post-discharge was greatest among participants with 4PPS = 1 at three months, when compared with 4PPS = 0 (p= 0.022).

CONCLUSIONS

This study showed that lateropulsion can continue to resolve up to one year post-stroke. Earlier lateropulsion resolution was associated with ongoing rehabilitation physiotherapy participation. Long-term functional gains were maintained among people discharged home, whereas functional status deteriorated after six months among those in residential care. Study findings will allow rehabilitation and service providers to better plan for and accommodate the long-term rehabilitation and care needs of people with post-stroke lateropulsion.

Lateropulsion in Right-Sided Stroke: Brain Anatomical Correlates of Severity and Duration

BACKGROUND AND PURPOSE

Lateropulsion (LP) is a profound disorder of postural control that has a significant impact on neurorehabilitation. Knowledge of relevant brain areas could guide decisions on appropriate intervention methods. Although LP severity and duration are highly variable in individuals with LP, imaging studies on LP have not sufficiently considered these aspects. The aim of this study was to investigate the lesion location in individuals after stroke and the correlation with LP duration and severity.

METHODS

A retrospective case-control study using voxel lesion symptom mapping (VLSM) in 74 individuals with right-sided brain lesion (49 with and 25 without LP) was performed to analyze the correlation between lesion location and LP severity. Duration was investigated in a subsample of 22 individuals with LP. LP was diagnosed by means of the Scale for Contraversive Pushing.

RESULTS

Individuals with LP showed significantly larger lesion sizes compared with the individuals with no LP. VLSM analysis of LP severity did not reveal statistically significant results. VLSM analysis showed a statistically significant association with longer LP duration for the inferior frontal gyrus, the hippocampus, the inferior parietal gyrus, the supramarginal gyrus, the angular gyrus, the temporal cortex, the sagittal stratum, and the superior longitudinal fasciculus.

DISCUSSION AND CONCLUSION

LP-relevant areas are located in the multisensory network. Areas of the frontoparietal network, which are related to spatial cognition, memory, and attention, were found to be relevant for duration and severity. The findings, especially those regarding duration involving the middle temporal cortex, could explain the better intervention outcomes for methods based more on implicit than on explicit knowledge of verticality.Video Abstract available for more insights from the authors (see the Video, Supplemental Digital Content 1 available at: http://links.lww.com/JNPT/A433 ).

Clinical practice recommendations for management of lateropulsion after stroke determined by a Delphi expert panel

OBJECTIVE

People exhibiting post-stroke lateropulsion actively push their body across the midline to the more affected side and/or resist weight shift toward the less affected side. Despite its prevalence and associated negative rehabilitation outcomes, no clinical practice guidelines exist for the rehabilitation of post-stroke lateropulsion. We aimed to develop consensus-based clinical practice recommendations for managing post-stroke lateropulsion using an international expert panel.

DESIGN

This Delphi panel process conformed with Guidance on Conducting and Reporting Delphi Studies recommendations.

PARTICIPANTS

Panel members had demonstrated clinical and/or scientific background in the rehabilitation of people with post-stroke lateropulsion.

MAIN MEASURES

The process consisted of four electronic survey rounds. Round One consisted of 13 open questions. Subsequent rounds ascertained levels of agreement with statements derived from Round One. Consensus was defined a priori as ≥75% agreement (agree or strongly agree), or ≥70% agreement after excluding 'unsure' responses.

RESULTS

Twenty participants completed all four rounds. Consensus was achieved regarding a total of 119 recommendations for rehabilitation approaches and considerations for rehabilitation delivery, positioning, managing fear of falling and fatigue, optimal therapy dose, and discharge planning. Statements for which 'some agreement' (50%-74% agreement) was achieved and those for which recommendations remain to be clarified were recorded.

CONCLUSIONS

These recommendations build on existing evidence to guide the selection of interventions for post-stroke lateropulsion. Future research is required to elaborate specific rehabilitation strategies, consider the impact of additional cognitive and perceptual impairments, describe positioning options, and detail optimal therapy dose for people with lateropulsion.

Post-Stroke Lateropulsion: Resolution and Function After Discharge From Inpatient Rehabilitation - A Cohort Study

Purpose

A person with post-stroke lateropulsion pushes their body toward their hemiparetic side and/or resists accepting weight onto their nonparetic side. Research findings regarding long-term persistence of lateropulsion and its association with function are lacking. This study reports associations between lateropulsion severity (Four Point Pusher Score - 4PPS) and functional outcome (Functional Independence Measure - FIM) at three months after discharge.

Methods

This prospective cohort study included 41 consecutive admissions to a stroke rehabilitation unit. Lateropulsion severity and FIM were measured at admission, discharge and three-month follow-up. Lateropulsion status at discharge, stroke laterality, ongoing physiotherapy after discharge, and demographic variables (age and sex) were tested for association with FIM change over the follow-up period.

Results

Complete data were available for 38 participants. Among these, 17 (44.7%) showed lateropulsion (4PPS ≥ 1) on admission, 9 (23.7%) showed persistent lateropulsion on discharge, and 7 (18.4%) showed persistent lateropulsion at three month follow-up. Improved functional status (FIM score) was seen at follow-up in those discharged with lateropulsion who had right-sided lesions but not in those with left-sided lesions.

Conclusions

Lateropulsion can continue to resolve after discharge from inpatient rehabilitation. Larger cohort studies are needed to further explore associations between persistent lateropulsion and long-term outcomes.

Accuracy of the Australian National Sub-Acute and Non-Acute Patient Classification in predicting rehabilitation length of stay for stroke survivors who are ≥65 years of age and have lateropulsion

BACKGROUND

Lateropulsion is a common impairment after stroke. Regardless of stroke severity, functional recovery is slower in people with lateropulsion, resulting in requirement for longer rehabilitation duration. In Australia, inpatient rehabilitation funding is determined via the Australian National Sub-Acute and Non-Acute Patient Classification (AN-SNAP). AN-SNAP class is determined using age, diagnosis, weighted Functional Independence Measure (FIM) motor score, and FIM cognitive score.

OBJECTIVES

To explore accuracy of the AN-SNAP to predict length of stay (LOS) for people with poststroke lateropulsion.

METHODS

A retrospective database audit was undertaken. AN-SNAP predicted LOS for each participant was calculated based on 2019 calendar year national benchmarks. A multivariable linear regression model estimated mean differences in reported LOS and AN-SNAP predicted LOS after adjusting for lateropulsion severity (Four Point Pusher Score). A separate logistic regression model assessed whether FIM change during admission was associated with reported LOS exceeding AN-SNAP predicted LOS.

RESULTS

Data were available from 1126 admissions. Reported LOS exceeding AN-SNAP predicted LOS was associated with greater lateropulsion severity on admission. Where AN-SNAP predicted LOS was longer, those with no lateropulsion on admission showed shorter reported than predicted LOS. Greater improvement in FIM during rehabilitation was associated with increased odds of reported LOS exceeding AN-SNAP predicted LOS (OR 1.02, 95%CI 1.01-1.03, p < .001).

CONCLUSIONS

Inclusion of a measure of poststroke lateropulsion in the AN-SNAP classification model would result in more accurate LOS predictions to inform funding. Costs of longer rehabilitation LOS may be countered by optimized long-term physical function, reducing requirement for ongoing care.

Treatment approaches for pusher behaviour: a scoping review

BACKGROUND

Some individuals with hemiplegia show a postural disorder called pusher behavior. Various underlying theoretical mechanisms have been proposed, thus leading to various treatment approaches.

OBJECTIVES

The aim of this scoping review is to identify and analyze the available evidence on the treatment approaches for pusher behavior.

METHODS

Two independent reviewers conducted a literature search for original studies reporting on treatments for pusher behavior. Studies were searched in PubMed, Scopus, Web of Science, CINAHL and PEDro from their inception to December 2020. Treatment approaches were grouped in homogeneous areas based on the supposed underlying mechanism. To assess the reporting of the interventions, the Template for Intervention Description and Replication (TIDieR) was used.

RESULTS

Thirty-one papers describing 45 interventions were included in the review. Most of the studies were case reports (i.e. including 1 person) (n = 16), followed by randomized controlled trials (n = 5), single subject design trials (n = 5), non-randomized controlled trials (n = 3), and case series (i.e. including more than 1 person) (n = 2). Treatment approaches were grouped into five categories: visual feedback, somatosensory cues, visual-somatosensory integration, brain stimulation, and other nonspecific treatments. The median number of TIDIeR items reported was 7 (range 4 to 10).

CONCLUSION

Pusher behavior is still little-known. Five main categories of treatment approaches based on the alleged etiological underlying mechanisms have been identified. Most of studies are case reports; controlled trials should be further conducted. Intervention reporting should be improved to allow treatment replication in larger trials.

rTMS for poststroke pusher syndrome: study protocol for a randomised, patient-blinded controlled clinical trial

INTRODUCTION

Poststroke pusher syndrome (PS) prevalence is high. Patients with PS require longer rehabilitation with prolonged length of stay. Effective treatment of PS remains a challenge for rehabilitation professionals. Repetitive transcranial magnetic stimulation (rTMS) is a non-invasive neuromodulation technique that is effective and recommended in the clinical guidelines of stroke rehabilitation. However, the role of rTMS for PS has not been examined. The study is to assess the efficacy of a specific rTMS programme for patients with PS in reducing pushing behaviour, enhancing motor recovery and improving mobility, as well as testing the safety of rTMS for patients with PS.

METHODS AND ANALYSIS

A randomised, patient and assessor blinded sham-controlled trial with two parallel groups will be conducted. Thirty-four eligible patients with PS will be randomly allocated to receive either rTMS or sham rTMS for 3 weeks. The primary assessment outcome is the pushing behaviour measured by the Burke Lateropulsion Scale and Scale for Contraversive Pushing. The secondary outcomes are the motor functions and mobility measured by the Fugl-Meyer Assessment Scale (motor domain) and Modified Rivermead Mobility Index, and any adverse events. Assessment will be performed at baseline and 1 week, 2 weeks and 3 weeks after intervention. Repeated-measures analysis of variance will be used for data analysis with the level of significance level set at 0.05.

ETHICS AND DISSEMINATION

The protocol has been approved by the Biomedical Ethics Committee of West China Hospital, Sichuan University on 23 March 2022 (2022-133). The trial findings will be published in peer-reviewed journals.

TRIAL REGISTRATION NUMBER

Chinese Clinical Trial Registry (ChiCTR2200058015).