Monitoring blood pressure has evolved from expensive, large equipment used only by professionals to something that we can all easily use. Huge advancements thanks to MEMS sensors and microcontrollers now allow for precise readings from much smaller form factors such as a watch, activity monitor or other wearable. Progression of MEMS sensors in the medical field will have increasing sophistication of algorithms that can detect accurate signals from the equipment.
More information on http://www.freescale.com/sensors