Relationship Analysis of Central Venous-to-arterial Carbon Dioxide Difference and Cardiac Index for Septic Shock

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Zhiqiang Guo
Ming Yin
Jichang Kong
Bin Wang
Kunpeng Dai
Tian Zuo
Guangyan Yu
Yong Bao
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[1] Department of Critical Care Medicine of Beidaihe Hospital of Qinhuangdao,
[2] Department of Interventional Endoscopy of General Hospital of North China Petroleum Administration,undefined
[3] Deparment of Critical Care Medicine of General Hospital of North China Petroleum Administration,undefined
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To analyze the relationship of the central venous-to-arterial carbon dioxide difference (p(cv-a)CO2) and cardiac index (CI) in patients with septic shock, an observational study was conducted in intensive care unit (ICU). 66 consecutive patients with septic shock and central venous oxygen saturation (ScvO2) ≥ 70% were included after early fluid resuscitation. Measurements were taken at a 6 h interval (T0, T6, T12, T18, T24) during first 24 h after their admission into ICU, including heart rate (HR), mean arterial pressure (MAP), central venous pressure (CVP), p(cv-a)CO2, cardiac index(CI, L/(min•m2)) and ScvO2. Patients were divided into low p(cv-a)CO2 group (n = 35) and high p(cv-a)CO2 group (n = 31) according to a threshold of 6 mmHg for p(cv-a)CO2 at T0. As a result, at T0, T6, T12, T18 and T24, there were respectively significant differences between low and high p(cv-a)CO2 groups for CI (4.1 ± 1.4 vs 2.4 ± 0.6, 4.4 ± 0.9 vs 2.8 ± 0.7, 4.1 ± 1.3 vs 2.9 ± 0.6, 4.0 ± 1.3 vs 2.7 ± 0.8, 4.2 ± 1.4 vs 2.9 ± 0.8, p < 0.001 at each time point), 28-day mortality rate was 38.7%(12/31) for high p(cv-a)CO2 group and 22.8% (8/35) for low p(cv-a)CO2 group (p > 0.05), there were significant differences for p(cv-a)CO2 (p < 0.05) between low and high p(cv-a)CO2 groups, no differences for HR, MAP, CVP, ScvO2 (p > 0.05). CI was inversely correlated with p(cv-a)CO2 value (r = −0.804, p < 0.001), but not for ScvO2(r = 0.08, p > 0.05). Receiver operating characteristic curve analysis confirmed the correlation of p(cv-a)CO2 with CI (AUC: 0.782;p < 0.001; 95% confidence interval: 0.710–0.853). The cut-off value for the best predictive value of CI ≥ 2.2 L/(min·m2) was p(cv-a)CO2 of 5.55 mmHg or lower with a sensitivity of 85.7% and specificity of 66.8%. Hence CI measured with USCOM is inversely correlated with p(cv-a)CO2 values in guiding the resuscitation of patients with septic shock.
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