<prompt> Maintenance level of Mixed Venous Oxygen Saturation in shock must be4040-5050-7070.  <response>: Mixed Venous Oxygen Saturation: - This is a measure of oxygen returning to hea from body after delivery and extraction by tissues. Normal Value- 50-70 In cardiogenic shock and Hypovolemic shock, the tissues takes up more oxygen and hence value is low 50 In Septic and Distributive shock , the tissues takes up less oxygen and hence more oxygenated blood returns to hea and hence value is high 70 Ref:- Surgery Sixer 3rd Edition; Pg num:- 8 