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Current guidelines recommend maintaining central venous oxygen saturation (ScvO 2 ) higher than 70% in patients with severe sepsis and septic shock. As high levels of ScvO 2  may reflect an inadequate use of oxygen, our aim was to evaluate the relation between maximal ScvO 2  levels (ScvO 2 max  ) and survival among intensive care unit (ICU) patients with septic shock.    Methods  We retrospectively analyzed data from all admissions to our ICU between January 2008 and December 2009. All septic shock patients in whom the ScvO 2  was measured were included. The measures of ScvO 2 max   within the first 72 hours after the onset of shock were collected.    Results  A total of 1,976 patients were screened and 152 (7.7%) patients met the inclusion criteria. The level of ScvO 2 max   was 85% (78 to 89) in the non-survivors, compared with 79% (72 to 87) in the survivors ( P  = 0.009).    Conclusions  Our findings raise concerns about high levels of ScvO 2  in patients with septic shock. This may reflect the severity of the shock with an impaired oxygen use. Future strategies may target an optimization of tissue perfusion in this specific subgroup of patients.

High central venous oxygen saturation in the latter stages of septic shock is associated with increased mortality