Final answer:
The true statement regarding innocent murmurs is that the murmur is low intensity, graded 1-3. Innocent murmurs are not associated with structural heart disease and are often benign without calling for prompt referral or exhibiting a precordial thrill.
Step-by-step explanation:
The question is asking which statement regarding innocent murmurs is true, and out of the given options, the accurate statement is that the murmur is low intensity, graded 1-3 on the murmur scale. An innocent murmur is a heart murmur that is not associated with any structural heart disease and is considered benign. An innocent murmur is typically soft (grade 1-3), heard during systole, and does not require any further investigation unless other symptoms are present. It is not holosystolic, it does not typically warrant a prompt referral to a cardiologist unless accompanied by other signs or symptoms of cardiac disease, and a precordial thrill (a palpable vibration on the chest wall accompanying a loud heart murmur) is generally not present with innocent murmurs.