Importance of Svo2 Monitoring and Plasma Lactate Level in Critical Care Management

DOI 2 Citations 16 References
  • MIYAO Hideki
    Department of Anesthesiology, Saitama Medical Center, Saitama Medical School
  • KOYAMA Kaoru
    Department of Anesthesiology, Saitama Medical Center, Saitama Medical School
  • KODAKA Mitsuharu
    Department of Anesthesiology, Saitama Medical Center, Saitama Medical School

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  • 混合静脈血酸素飽和度と血中乳酸値測定の意義

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  Although assessment of cardiac function using the Starling curve has been widely accepted for management of critically ill patients, the method does not contain the idea of oxygen demand and supply. The mixed venous oxygen saturation (Svo2) is determined by arterial oxygen saturation (Sao2) , oxygen consumption (Vo2) , hemoglobin (Hb) , and cardiac output (CO) . Then, since Svo2 can assess the abnormal balance between oxygen demand (Vo2) and supply (Sao2, Hb, CO) , it is useful for cardiac and metabolic management, i.e., during anesthesia as a lower oxygen demand state or in septic shock as a higher oxygen demand state. High Svo2 does not always means a good condition because arterio-venous shunt or impaired oxygen utilization in septic shock increases Svo2. Plasma lactate level can complement the disadvantages of Svo2 in such pathological states. The meaning and utility of Svo2 and lactate monitoring are discussed in the text.

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