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      Serum IGF-I levels correlate to improvement of functional outcome after ischemic stroke.

      The Journal of Clinical Endocrinology and Metabolism
      Adolescent, Adult, Aged, Brain Ischemia, blood, rehabilitation, Female, Humans, Insulin-Like Growth Factor I, metabolism, Male, Middle Aged, Recovery of Function, physiology, Stroke, Treatment Outcome

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          Abstract

          GH has positive cognitive effects when given to GH-IGF-I-deficient patients. GH and IGF-I exert both neuroprotective and regenerative effects on experimental stroke. We investigated whether the endogenous serum IGF-I (s-IGF-I) levels correlated with recovery of functional independence in patients who had suffered an ischemic stroke. The s-IGF-I levels were measured in 407 patients (260 males, 147 females) with mean age of 55 (range, 18-69) yr and 40 randomly selected matched controls who were previously included in the Sahlgrenska Academy Study on Ischemic Stroke. Serum samples were collected on two occasions: acutely at 1-10 d (median, 4 d) after stroke and 3 months after the stroke. Recovery after ischemic stroke was evaluated using the modified Rankin scale 3 and 24 months after the stroke, and the Scandinavian Stroke Scale was used for assessments during the acute stage and 3 months after the stroke. The s-IGF-I levels were higher in the acute stage than after 3 months and compared with the controls (P < 0.001 and P < 0.01, respectively), and the s-IGF-I levels were progressively lower in the elderly patients. The levels of s-IGF-I in the acute phase and after 3 months both positively correlated with improvement in the modified Rankin scale scores between 3 and 24 months (P = 0.001; r = 0.174, and P < 0.001; r = 0.24, respectively). A high s-IGF-I during the rehabilitation phase of stroke correlates to better recovery of long-term function.

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