HRA in mapping contexts refers to recording from which chamber?

HRA in mapping contexts refers to recording from which chamber?

• A. High Right Atrium
• B. Left Atrium
• C. Right Ventricle
• D. Left Ventricle

Answer: (A)

In mapping contexts, HRA stands for recording from the high right atrium—the upper portion of the right atrium near the sinoatrial node. This site is used to capture atrial electrical activity and timing (for example, atrial activation and A-H conduction), making it an atrial reference point during mapping. It is not a recording site for the left atrium or either ventricle, which would be mapped from different locations. So the correct interpretation is that HRA records from the high right atrium.

In mapping contexts, HRA stands for recording from the high right atrium—the upper portion of the right atrium near the sinoatrial node. This site is used to capture atrial electrical activity and timing (for example, atrial activation and A-H conduction), making it an atrial reference point during mapping. It is not a recording site for the left atrium or either ventricle, which would be mapped from different locations. So the correct interpretation is that HRA records from the high right atrium.