Institutional Overlap and Responses to Political Crises in South America

The current regional security architecture in South America is characterized by a proliferation of institutions. Most regional organizations have by now adopted mechanisms to respond to domestic political crises and unconstitutional changes of government. This chapter studies whether overlapping mandates and activities in the management of political crises are harmful or beneficial for regional cooperation. The first part theorizes the effects of overlap on member states’ strategies, regional organizations’ interaction patterns, and the policy outcome. The second part explores overlapping democracy clauses in South America and analyzes six episodes where OAS, MERCOSUR, and/or UNASUR have simultaneously taken action in defense of democracy. The results show that, in the face of power shifts and competitive inter-organizational dynamics, overlapping actions by regional organizations might jeopardize the norms they set out to protect

Interventions for age-related visual problems in patients with stroke

<b>Background</b> The prevalence of eye problems increases with age and, consequently, so does the level of visual impairment. As the incidence of stroke also increases with age, a significant proportion of stroke patients will have age-related visual problems. It is possible that the effect of interventions for age-related visual problems may differ in the population of stroke patients compared to the wider population of older people. The interaction between the problems arising directly from stroke and those arising directly from age-related visual problems will be complex. Interventions for age-related visual problems may also be affected by the presence of other stroke-related co-morbidities. Consequently, the nature and outcome of interventions for age-related visual problems may be different in patients with stroke.<p></p> <b>Objectives</b> The aim of this review is to determine if interventions for age-related visual problems improve functional ability following stroke.<p></p> <b>Search methods</b> We searched the Cochrane Stroke Group Trials Register (March 2011), the Cochrane Eyes and Vision Group Trials Register (December 2009) and nine electronic bibliographic databases including: the Central Register of Controlled Trials (CENTRAL) (The Cochrane Library 2011, Issue 1), MEDLINE (1950 to February 2011), EMBASE (1980 to February 2011), CINAHL (1982 to February 2011), AMED (1985 to February 2011) and PsycINFO (1967 to February 2011). We also searched reference lists and trials registers, handsearched journals and conference proceedings, and contacted experts.<p></p> <b>Selection criteria</b> Randomised trials in adults after stroke, where the intervention is specifically targeted at assessing, treating or correcting age-related visual problems, or improving the ability of the patient to cope with visual impairment. Primary outcome was functional ability in activities of daily living and secondary outcomes included functional ability in extended activities of daily living, visual acuity, visual field, visual function, balance, falls, depression and anxiety, discharge destination/residence after stroke, quality of life and social isolation, adverse events and death.<p></p> <b>Data collection and analysis</b> Two review authors independently screened abstracts and planned to extract data and appraise trials. We planned that assessment of methodological quality would be undertaken for allocation concealment, blinding of outcome assessor, method of dealing with missing data and other potential sources of bias.<p></p> <b>Main results</b> We considered 7357 titles, 460 abstracts and 85 full papers. We identified no studies for inclusion in this review.<p></p> <b>Authors' conclusions</b> There are no implications for practice arising from this review. Evidence relating to the management of patients (from the general population) with age-related visual problems is available from other Cochrane reviews and is likely to be the best evidence available for making treatment decisions about individual patients. Subgroup analyses within these reviews to explore the effect of interventions for age-related visual problems in patients with stroke are recommended. We recommend that the objectives and selection criteria for this Cochrane review are amended and clarified prior to any future updates