Is it true that the congestive heart failure means that the pumping efficiency of the heart is depressed so that there is inadequate delivery of blood to body tissues?

Technically "shock" refers to the inadequate delivery of oxygen to the body tissues. With that in mind, congestive heart failure (CHF) can lead to shock because the heart is unable to adequately circulate blood through the body. It is still possible to be suffering from signs and symptoms of CHF but still have adequate delivery of oxygenated blood to you body tissues.

In the medical world many would describe CHF as the heart is drowning in fluid's.