Debate : do we need invasive monitoring in severe sepsis?

Pro-con debate on the always open topic of the utility of invasive monitoring vs non-invasive monitoring in patient affected by sepsis. Despite the fact that invasive monitoring grant an early treatment other tests can be performed on symptoms to evaluate: Haemodynamics( CO, Pressure (MAP, CVP), Swan-Ganz, Volumes) and Breathing (Pressures, Volume). The question is: Which is the adequate haemodynamics? Non-invasive monitoring includes Pulse oxymetry, PETCO2, Echography, Blood gases and Urine analysis. According to blood samples remember the venous side!