An elderly man is brought into the hospital on a hot, sunny day complaining of light-headedness. You administer an ECG and notice that the P-R interval is 350 msec. His heart sounds are normal. His blood tests indicate that the LDH, SGOT, CK, and CK-MB levels are all normal. What is wrong with this patient?

An elderly man is brought into the hospital on a hot, sunny day complaining of light-headedness. You administer an ECG and notice that the P-R interval is 350 msec. His heart sounds are normal. His blood tests indicate that the LDH, SGOT, CK, and CK-MB levels are all normal. What is wrong with this patient?

The answer is :

The man has a problem with the conduction system of the atria or possibly with the AV node.

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