<prompt> All of the following lead to AV block except?HypothyroidismAnkylosing spondylitisLyme diseaseLevs disease  <response>: Myxedema AV node can block Ankylosing spondylitis will not cause av block Lyme disease caused by Borrelia burgdorferi, transmitted by Tick Bite causes Myocarditis AV block. Levs disease Idiopathic fibrosis of conduction system. 