XXXX after the age of sixty.

@entity1 @entity410 @entity455 @entity1313 @entity179 @entity302 @entity731
Despite adequate diagnostic evaluation and prolonged follow-up, the causes of @entity302 in the elderly @entity1 frequently remain unknown. Some of these may be of occult, @entity179 origin--entities which are often difficult to incriminate specifically. Unquestionably, in a few cases, @entity410 occur at the time of the initial cerebrovascular accident, although in some @entity1 @entity410 may follow such an episode after a latent interval, particularly when cortical motor areas have been damaged by the initial vascular insult. It is important to differentiate this group from those with recurrent @entity455 , in whom diagnostic studies and treatment may differ. @entity1313 is as prominent a cause of @entity410 in the seventh decade as it is in younger adults, but probably is of lower incidence thereafter. Focal, clinical and electroencephalographic findings and a progressive clinical course are particularly common in this group. A heterogeneous group of causes, a few of which are liable to affect the ageing @entity1 , are responsible for some of the @entity410 in old age and should be searched for when the etiology is obscure. Diagnostic studies will vary with the individual problem and, whenever possible, should be restricted to non-invasive studies such as electroencephalography and computer-assisted tomography, after initial baseline clinical assessment and laboratory studies have been performed. Contrast procedures such as angiography are sometimes hazardous to @entity1 with @entity731 and should be reserved for selected @entity1 . Treatment follows conventional guidelines with some modifications due to the vulnerability of the ageing @entity1 to @entity179 of immobilization.
