Left Spatial neglect

Levine, David N.; Warach, Joshua D.; Benowitz, Larry I.; Calvanio, Ronald

doi:10.1212/wnl.36.3.362

Cited by 123 publications

(62 citation statements)

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“…In those reports that did, it was invariably within the first few days after onset of stroke. 38,41,48 It is well known that early (Ͻ24 hours after onset of stroke) CT scans can be misleading because they may show few or no abnormalities.…”

Section: Discussionmentioning

confidence: 99%

Reasons for Variability in the Reported Rate of Occurrence of Unilateral Spatial Neglect After Stroke

Bowen

McKenna

Tallis

1999

Stroke

360

228

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Background and Purpose-We sought to determine the frequency of occurrence of contralesional unilateral spatial neglect (USN) after stroke and to investigate the effect of side of lesion, nature of assessment tool used, and timing of assessment relative to stroke onset. Methods-We performed a systematic review of published reports, identified by a search of electronic databases (MEDLINE 1966, PSYCHLIT 1974, and CINAHL 1982 and by searching reference lists of the reports selected. Excluded were unpublished, non-English language, and nonhuman studies. Results-Thirty published reports met the selection criteria, 17 of which directly compared right brain damage (RBD) and left brain damage (LBD). Contralesional USN appeared to occur more frequently after RBD than LBD in 16 of these. Both the assessment tool used and the time of assessment relative to stroke onset affected the reported rate of occurrence, although recovery rate data were inadequate (4 reports). Conclusions-The clinical belief that USN occurs more frequently after RBD than LBD was apparently supported by a systematic review of published data. However, an accurate estimate of the rates of occurrence and recovery after stroke could not be derived. Four reasons for the variability among studies were discussed, including subject selection, lesion localization, and nature and timing of assessment. Different USN disorders may exist, which may require type-specific rehabilitation approaches. This may have implications for epidemiological studies and for the development of new treatments. Theoretically driven epidemiological studies are required before adequately powered randomized controlled trials of rehabilitation can be conducted.

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Section: Discussionmentioning

confidence: 99%

Reasons for Variability in the Reported Rate of Occurrence of Unilateral Spatial Neglect After Stroke

Bowen

McKenna

Tallis

1999

Stroke

360

228

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“…Atrophy has often been shown to increase the risk of post-stroke dementia [26]. Similarly, left hemi-neglect and delusions are more common following right hemisphere infarcts in the presence of atrophy [27, 28]. …”

Section: Discussionmentioning

confidence: 99%

Haemodialysis and Cerebral Oedema

Walters

Fox

Crum

et al. 2001

Nephron

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Background: Haemodialysis may cause neurological symptoms ranging from inconvenient feelings of disequilibrium to life-threatening neurological complications. There are animal data to suggest cerebral swelling may accompany haemodialysis and contribute symptomatically to dialysis disequilibrium. However, MR images acquired following haemodialysis often fail to demonstrate evidence of cerebral oedema. We wished to quantify any potential cerebral volume change which is caused by haemodialysis treatment. Method: Five renal patients and 5 control subjects had a two volumetric T1-weighted MRI scans on the same day. The patients were imaged immediately before and after haemodialysis. None were taking steroids. Precise positional matching (registration) was used to quantify cerebral volume change. Results: Patients had an increase in cerebral volume following dialysis which averaged 32.8 ml (SE 7.4 ml, 3% brain volume). The change in the controls was 1.4 ml (SE 0.6 ml), p < 0.001. No patient had significant neurological symptoms. Conclusion: Cerebral oedema developed in the patients following dialysis. There is a good biological model for these observations. Modifications to dialysis may help. Common problems which increase cerebral volume, e.g. acute stroke, require careful appraisal in these patients. These observations need consideration when quantifying atrophy in dialysis patients.

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“…An impaired automatic orienting of attention appears to constitute the core deficit, as shown by its persistence even in patients clinically recovered from neglect. The use of volitional orienting mecha,isms, possibly mediated by the dorsolateral frontal cortex, may temporarily or permanently be precluded to neglect patents on account of diaschisis phenomena (Fiorelli, Blin, Bakchine et al, 1991), or because of the presence of lesions extending anteriorly or subcortically (Colombo, De Renzi and Gentilini, 1982;Hier et al, 1983;Levine, Warach, Benowitz et al, 1986).…”

Section: Discussionmentioning

confidence: 99%

The Novelty Effect in Recovered Hemineglect

Bartolomeo

1997

Cortex

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Left neglect patients, patients who had recovered from left neglect and control subjects performed a task of simple motor reaction times (RTs) to lateralised visual stimuli. Neglect and recovered patients were slower than controls on left-sided targets. To explore the time course of the allocation of attention across space, an analysis of responses as a function of the serial order of the trials was performed. While neglect patients' performance did not substantially change over time, recovered patients showed a stereotyped 'novelty effect', consisting of larger left/right RT differences at the beginning of the task than at the end of it. To explain this practice-related change, a trade-off is hypothesised between the process of learning the motor task and the mechanisms involved in recovery from neglect, such as the reorienting of attention toward the contralesional side following the initial ipsilesional orienting. A possible role is proposed for the prefrontal cortex as the crucial neural structure that mediates both processes.

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Left Spatial neglect

Cited by 123 publications

References 0 publications

Reasons for Variability in the Reported Rate of Occurrence of Unilateral Spatial Neglect After Stroke

Reasons for Variability in the Reported Rate of Occurrence of Unilateral Spatial Neglect After Stroke

Haemodialysis and Cerebral Oedema

The Novelty Effect in Recovered Hemineglect

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