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Chronic β-blockade is associated with a reduction in the inward component of IK1 (at −120 mV). Values are means±SEM current-voltage-relationship for Ba2+-sensitive IK1, in myocytes from patients treated (●: n=21 myocytes, 11 patients) or not treated (○: n=31 myocytes, 12 patients) with a β-blocker. *=p<0.05.
