Which of the following is associated with A-V block?: (A) Hypothyroidism, (B) Hypehyroidism, (C) Cushing disease, (D) Pheochromocytoma
Answer is A. Hypothyroidism will lead to myxedema which can interfere in A.V conduction pathway of hea. Etiologies of Atrioventricular Block Autonomic Carotid sinus hypersensitivity Vasovagal Metabolic/ Endocrine Hyperkalemia Hypermagnesemia Hypothyroidism Adrenal insufficiency Drug Related Beta blocker Calcium channel blockers Digitalis Adenosine Antiarrhythmics (class I and III) Lithium Infectious Endocarditis Lyme disease Chagas disese Syphilis Tuberculosis Diphtheria Toxoplasmosis Heritable/ congenital