Heart failure, atrial fibrillation, hypertension and hypertrophic obstructive cardiomyopathy are the conditions that my 100-lb., 90-year-old mother has suffered. Her systolic blood pressure ranges from 110 to 134, but her dystolic pressure has been in the range of 47-56 for the past two weeks. What are your thoughts on the reason for her dystolic pressure being so low?