Antihistamines and QT prolongation

[loveoforganic2]

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Is there a known/proposed mechanism for this?

 

[Suncrusher]

antihistamines are atypical antimuscarinics...I think they cause tachycardia but also long QT. I read on medscape that some of the H1 blockers block fast Na+ while others block rectifying K+...I think that means long QT either way. Don't quote me on this even though I just reviewed it today. It confuses the **** out of me.

 

[loveoforganic2]

Edit: I have no idea what I'm talking about, I'll return to this eventually...