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The normal PR interval is:

A.

0.04-0.20 seconds

B.

0.12-0.20 seconds

C.

Less than half the R-to-R ratio

D.

0.08-0.10 seconds

Answer and Explanation

The Correct Answer is B

Choice A reason: A PR interval of 0.04-0.20 seconds is too broad and includes values that are both below and above the normal range.

Choice B reason: A PR interval of 0.12-0.20 seconds is the established normal range for adults, reflecting proper conduction through the AV node.

Choice C reason: The PR interval being less than half the R-to-R ratio is not a standard measurement for PR intervals and does not provide a specific range.

Choice D reason: A PR interval of 0.08-0.10 seconds is below the normal range and may suggest pre-excitation or an AV nodal (junctional) rhythm.
 


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Related Questions

Correct Answer is B

Explanation

Choice A reason: A PR interval of 0.04-0.20 seconds is too broad and includes values that are both below and above the normal range.

Choice B reason: A PR interval of 0.12-0.20 seconds is the established normal range for adults, reflecting proper conduction through the AV node.

Choice C reason: The PR interval being less than half the R-to-R ratio is not a standard measurement for PR intervals and does not provide a specific range.

Choice D reason: A PR interval of 0.08-0.10 seconds is below the normal range and may suggest pre-excitation or an AV nodal (junctional) rhythm.

Correct Answer is D

Explanation

Choice A reason: Aspirin can irritate the stomach lining and increase acid reflux, worsening GERD symptoms. It is generally not recommended without consulting a healthcare provider.
Choice B reason : Mercury content in seafood is not directly linked to GERD. This statement is misleading and does not address known risk factors for GERD.
Choice C reason : Lying down after eating can indeed increase the onset of GERD as it allows stomach contents to flow back into the esophagus more easily.
Choice D reason : Alcohol and caffeine can relax the lower esophageal sphincter, allowing stomach acid to rise into the esophagus and worsen GERD symptoms. Therefore, it is advisable to avoid or reduce their intake.

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