The present invention is related to a database management system that is capable of autonomous dynamic ontology management through soft classing. Myopotential associated with each of the sensing channels in monitored, and a ventricular arrhythmia monitoring mode is selected based thereon. In one form, the tool uses heat pipes to remove thermal energy from the head, and also a heat exchanger for higher-powered units. The substrate may be in an organic solvent or may be aqueous based. The heat-dissipating member provides a first heat-dissipating path for the first electronic component.