Question:
Mobitz type 2 second degree AV block is seen in all of the following EXCEPT:
Mobitz type 2 second degree AV block is seen in all of the following EXCEPT:
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Mobitz II comes from infranodal conduction damage; which option does not scar the His-Purkinje system?
Updated On: Jun 24, 2026
- Hypothyroidism
- Coronary artery disease
- Sarcoidosis
- Cushing syndrome
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The Correct Option is D
Solution and Explanation
Step 1: Mobitz type 2 AV block reflects damage to the His-Purkinje conduction system. It is caused by structural or infiltrative disease of the conduction tissue. Step 2: Recognised causes include coronary artery disease and myocardial infarction (ischaemic damage), infiltrative cardiomyopathies such as sarcoidosis and haemochromatosis, and myxoedema (hypothyroidism), as well as valve surgery, myocarditis and Lyme disease. So options a, b and c are all true associations. Step 3: Cushing syndrome (cortisol excess) causes hypertension, central obesity, hyperglycaemia and metabolic effects but is not a recognised cause of Mobitz type 2 block; it does not infiltrate or destroy the His-Purkinje system. Step 4: Therefore the EXCEPT answer is Cushing syndrome (option d).
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