<prompt> All of the following are associated with Atrioventricular block, except:HyperkalemiaHypomagnesemiaHypothyroidismCushings syndrome  <response>: Adrenal insufficiency is associated with Atrioventricular Block Not cushing;s syndrome. MetabolicEndocrine Causes of AV Block: Hyperkalemia Hypermagnesemia Hypothyroidism Adrenal Insufficiency Ref: Harrison 19th edition Pg no: 1471 