Question:medium
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
Show Solution
The Correct Option is D
Solution and Explanation
Step 1: The task is to find the condition NOT linked to Mobitz type 2 second-degree AV block.
Step 2: The conduction system can be damaged by ischaemia (coronary artery disease, MI), inflammation (myocarditis), and infiltration (sarcoidosis, haemochromatosis), all of which can produce this block, so those options are real causes.
Step 3: Metabolic and systemic causes such as myxoedema from hypothyroidism, Lyme disease, and neuromuscular disorders are also documented, confirming hypothyroidism as a cause.
Step 4: Cushing syndrome, a state of cortisol excess, is not on the list of recognized causes of this AV block, making it the exception.
\[\boxed{\text{Cushing syndrome}}\]
Step 2: The conduction system can be damaged by ischaemia (coronary artery disease, MI), inflammation (myocarditis), and infiltration (sarcoidosis, haemochromatosis), all of which can produce this block, so those options are real causes.
Step 3: Metabolic and systemic causes such as myxoedema from hypothyroidism, Lyme disease, and neuromuscular disorders are also documented, confirming hypothyroidism as a cause.
Step 4: Cushing syndrome, a state of cortisol excess, is not on the list of recognized causes of this AV block, making it the exception.
\[\boxed{\text{Cushing syndrome}}\]
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