A congestive heart failure mortality risk metric is automatically generated using an implantable medical device and, if it exceeds a predetermined threshold, a warning signal is issued indicating a significant risk of mortality due to CHF, perhaps necessitating more aggressive medical therapy. The charge pump outputs an output voltage according to the operation of at least one clock signal. A value is retrieved from a data store using the unique key. On the other hand, since the small capacity buffer transfers the cell to only one output port, it is sufficient if the switching matrix SWM is of a N:1 multiplexer structure which is far simpler than a complete cross-bandwidth available register structure. The deformation structure is formed in a lower fuselage region disposed below the lower floor structure.