The nurse auscultates the precordium of a client who is diagnosed with mitral valve regurgitation and hears a grade IV systolic murmur. When documenting the comparison of systolic murmurs, which characteristics should the nurse use to support this systolic finding?

Choice A rationale A moderately loud, machine-like rumble is characteristic of a patent ductus arteriosus, which is a continuous murmur, not typically a systolic murmur associated with mitral regurgitation. A thrill signifies a palpable murmur intensity. Choice B rationale A grade IV systolic murmur is characterized as loud and typically associated with a palpable thrill, which is a vibratory sensation over the precordium. Mitral regurgitation murmurs are often loudest at the apex due to the turbulent flow during systole. Choice C rationale A very loud murmur heard without a stethoscope, with an easily palpable thrill and visible heave, describes a grade VI murmur, which is the highest intensity. A grade IV murmur is loud but still requires a stethoscope for auscultation. Choice D rationale A soft, barely heard murmur in a quiet room describes a grade I systolic murmur. This intensity indicates a very faint sound and is not consistent with a grade IV murmur, which is considerably louder and more easily detected.