We know that alterations in hemodynamics do not only occur in hemorrhagic shock.  Both obstructive (such as from tension pneumothorax) and neurogenic shock (for example, from a spinal cord transection), can result in hemodynamic compromise that would not be corrected by blood product administration.  There have been some studies that have shown isolated traumatic brain injury (TBI) can also cause hemodynamic derangements. This article looks at a paper which attempts to examine the incidence of cardiovascular instability in patients with TBI.