Blood pressure question

[icemanof92]

I have a couple of questions regarding blood pressures. I am a nursing student, and also an EMT student. I normally feel comfortable checking bp's and I am usually confident in my reading, but occasionally I will have a patient who doesn't quite fit the mold of textbook korotkoff sounds, and it throws me.

On the systolic, sometimes a few mmhg above where I start hearing an actual beat, I hear a whoosh type sound. Is the systolic going to be the start of the whoosh, or the sound of the beat?

Sometimes with the diastolic, the sound changes from a beat back to a whoosh. I have been taught that the point where it changes is the diastolic, as opposed to the point at which all sounds stop (unless the beat stops and there is no more sound). Is this correct?

Thanks for your help!