1. A method of treating congestive heart failure using an implantable medical device, the method comprising: applying a first electrical signal during a first stimulation period and applying a second electrical signal during a second stimulation period to a cranial nerve, wherein: the first electrical signal comprises: a pulse frequency; a first pulse width; and a first pulse amplitude; and the second electrical signal comprises: a plurality of microbursts applied at a microburst frequency, wherein at least one microburst comprises a plurality of microburst pulses applied during a first microburst duration, wherein each microburst pulse comprises: a second pulse width; a pulse shape; and a second pulse amplitude; wherein the first pulse width is different than the second pulse width and the first pulse amplitude is different than the second pulse amplitude and wherein a microburst has a microburst characteristic where the microburst characteristic includes at least one of: a number of electrical pulses being between 2 to 25 and a microburst duration of 10 milliseconds to 1 second.