Its such a relief to get an answer to my concerns. Its been 18 months since cardiac arrest. I have researched supplements but concerned they would interfere with warfarin and other drugs he takes. Looked at acetylcholine. Hes taking B vitamins. Will look at thread for supplements. I do notice that when we do lumosity, fitbrains etc he will verbalise some strategies to help. One of the biggest problems is that he worries he will say the wrong thing and also finds it hard to retrieve ideas so doesent talk: it gets very lonely.