Final answer:
NSR is the abbreviation that is NOT a diagnostic procedure.
Step-by-step explanation:
CTA, MRA, EKG, and TEE are all abbreviations for diagnostic procedures. However, NSR, which stands for Normal Sinus Rhythm, is not a diagnostic procedure. It refers to a normal heart rhythm without any irregularities or abnormalities. NSR is used to describe the normal functioning of the heart.
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