In various embodiments, only a few selected channels are available to be used for scanning for a network controller in a wireless network. Each of the first and second sections is formed so as to include at least three lobes and four 180\xb0 turns, while establishing a thin profile heating element. The first casing has a plurality of first interconnect elements, and the second casing engages the first interconnect elements to the first casing. A bypass conduit communicating with a delivery side of the pump is connected via a first check valve to a first intermediate space defined between the first helical teeth and the second helical teeth and via a second check valve to a second intermediate space defined between the second helical teeth and the third helical teeth. The first and second coolants have first temperatures entering and second temperatures exiting the heat transferring mechanism, respectively. Upon detection of bradycardia or a drop in blood pressure indicating the onset of syncope, electrostimulation pulses are delivered during the heart’s refractory period.