Until now, the primary system for monitoring fluid buildup, frequently termed “overload,” has been extremely simple and less than low-tech – the simple bathroom scale to measure weight gain. Now, Medtronic (Minneapolis) claims a large and definitely high-tech advance, using the November scientific sessions of the American Heart Association (AHA; Dallas) to report approval of its InSync Sentry cardiac resynchronization therapy (CRT) defibrillator systems.