Hello everybody, I have a question regarding taking blood pressure from patients. I know the systolic pressure is when u hear the first tone and diastolic pressure is when the tone is last heard. But sometimes before I hear a real tone, I hear a pulsating sound, like a static sound or murmur or something, hard to explain. When i hear that sound, is that the systolic pressure? Sometimes that pulsating sound lasts 20 mmHG.