Following a great question about heart rate and QT: Pacemakers can be a therapy for Long QT patients. In Long QT patients a sudden increase in heart rate can prolong the QT interval dramatically and even more so when the heart rate decreases again. Pacing has a number of benefits and some Long QT patients can be ‘treated’ with aggressive pacing to keep their heart rate higher than their intrinsic rate would normally rest at. Pacing obviously also has its drawbacks and risks so it isn’t a standard treatment option for all.
The Long Cutie 