Measuring visual neglect in acute stroke and predicting its recovery: the visual neglect recovery index.

Abstract

An overall measure of the recovery of visual neglect in patients with an acute stroke is described: The "Visual Neglect Recovery Inde" (VNRI) expresses the amount of visual neglect on a battery of visual neglect tests as a percentage of complete recovery from the maximal visual neglect measurable. The principles underlying the development of the index are similar to those involved in the development of the Motricity Index for hemiplegia. A population of 68 survivors of stroke who presented with visual neglect at two to three days were followed for up to six months. The VNRI showed that neglect was greater in those with right hemisphere stroke than in those with left hemisphere stroke and that recovery was most rapid over the first 10 days and reached a plateau at three months. Most patients, including many with severe initial visual neglect, showed little visual neglect at three months. Stepwise regression analysis showed that the severity of visual neglect at three months and at six months post-stroke could be predicted by the severity of visual neglect and the presence of anosognosia at two to three days. A regression equation was produced which may enable clinicians to select patients for intensive treatment of visual neglect.