<prompt> Mobitz type 2 second degree AV block is seen in all except:HypothyroidismCoronary Aery DiseaseSarcoidosisCushing syndrome  <response>: Delay or lack of conduction through the atrioventricular AV node and below has multiple causes. Degenerative changes eg, fibrosis, calcification, or infiltration are the most common cause of nonischeamic AV block. Idiopathic fibrosis or calcification of the AV conduction system, commonly seen in the elderly, can cause complete AV block. Causes of Mobitz type 2 second degree AV block are - Damage of the conduction system from coronary aery disease, valve surgery, myocardial infarction, myocarditis, infiltrative cardiomyopathies sarcoidosis, hemochromatosis, myxedema, Lyme disease, neuromuscular disease, and AV junction ablation REF : HARRISONS 21ST ED 