Those which occur during relaxation of the heart between beats are called diastolic murmurs. Those which occur during contraction of the heart muscle are called systolic murmurs
Diastolic is more likely to be due to a real problem, where systolic may be harmless. However, there's no rule about which is worse...they have different possible causes, both bad and not so bad.
What does the BP numbers mean? The number on the top is the systolic blood pressure and the number on the bottom is the diastolic blood pressure. The systolic BP is the pressure in the arteries right...