The high ratio of "central venous to arterial carbon dioxide" to "arterial to central venous oxygen content " is associated with elevated lactate in patients with septic shock. So, the aim of the present study is to evaluate the ratio of "central venous-to-arterial CO2 tension or content" to "arterial-to-venous O2 content'' as an indicator of anaerobic metabolism in septic shock.
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Evaluation of the change of the ratio of "central venous-to-arterial CO2 tension or content" to "arterial-to-central venous O2 content" as an effective marker to indicate anaerobic metabolism in septic shock.
Timeframe: Measurements will be taken immediately before and immediately after volume expansion