hyperthyroid patients and observed no change in serum T3 concentrations.2We realise that these 3-adrenergic blocking drugs are less activethanpropranolol as membrane-stabilising agents, both as a local anaesthetic and in their action on intracellular cardiac potentials,3 but we would have expected to see a fall in serum T3 levels if the mechanism proposed by Dr Heyma and others is correct.
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Wright et al. (1980) studied this question.