What type of murmur is generally not associated with a thrill?

A 3/6 murmur is typically not associated with a thrill because it is classified as a moderate murmur that is audible but does not produce enough turbulence in blood flow to create a palpable vibration or thrill. Murmurs are graded on a scale from I to VI based on their intensity, with grades I and II usually being soft and often not associated with thrills.

As the grade of the murmur increases to 4/6 or above, the turbulence increases significantly, making it more likely that a thrill will be palpated. A 4/6 murmur, for example, is considered a loud murmur that is often accompanied by a palpable thrill and indicates more significant hemodynamic changes. Similarly, 5/6 and 6/6 murmurs indicate very loud sounds with extreme turbulence, which almost always correlate with a thrill.

In summary, a 3/6 murmur represents a level of intensity where the blood flow is turbulent enough to create an audible sound but not enough to produce the sensation of a thrill, making it the correct choice in this scenario.