CV [cardiovascular] ¶ RRR; normal heart sounds; no murmurs, rubs, or gallops 2009, Kristen L. Longstreth, “Pulmonary Embolism”, in Terry L. Schinghammer, Julia M. Koehler, editors, Pharmacotherapy Casebook: A Patient-Focused Approach, 7th edition, McGraw Hill, →DOI, →ISBN, page 62:
(abbreviation, alt-of, countable, initialism, uncountable) Initialism of relative risk reduction.