User:Dan Pagel is my name/sandbox

Recently subscribed to the "Harvard Healthy Heart was indicative Newsletter." There ad specified a reason for taking blood pressure readings from both arms instead of just one; that a variance of 10 points or more was indicative of a worsening heart condition. What is the significance? My wife's primary care giver had not heard of this, whom she saw within a week of having a heart attack. Would very much like to pass on the info to that physician.