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Here are some citations that you might want to look up:

 Callejas Rubio JL, et al.
Celiac disease presenting as chronic anemia associated with heart block.
Am J Gastroenterol. 1998 Aug;93(8):1391-2. Review.

 Mah MW, et al.
Idiopathic pulmonary hemosiderosis, complete heart block and celiac disease.
Can J Cardiol. 1989 May;5(4):191-4.

 Rautureau M, et al.
[Bile acids and salts].
Arch Fr Mal App Dig. 1971 Aug-Sep;60(8):445-62. Review. French.

 Cozzolino G, et al.
[Clinical findings and pathogenetic considerations on a case of
gluten-sensitive arrhythmia].
Boll Soc Ital Cardiol. 1968;13(1):107-15. Italian.