Thank you for your question, i am assistant professor in the field of cardiology and working in a tertiary care unit. Pulse pressure alone cannot be used as a marker to predict the risk of future heart problems. In most of the healthy people who have normal arterial elasticity have low diastolic pressure. So if you do not have any symptoms of chest pain or shortness of breath then you do not need to worry.
Thank you for your reply, as heart muscles get their blood during diastole, so lower the diastolic pressure lesser blood heart muscles get. In my clinical experience diastolic pressure less than 40-45 is more related to heart problems but still as i have mentioned that we do not have a study which helps us to see only diastolic pressure alone as a marker for future heart disease.