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![<bold>Figure 4</bold>](/view/journals/anpr/64/2/inline-i0003-3006-64-2-106-f04.png)
Splanchnic circulation under fasting conditions. The liver receives most of its blood supply via the portal vein under fasting conditions. (Source: Barrett KE. Chapter 10. Functional anatomy of the liver and biliary system. In: Barrett KE, ed. Gastrointestinal Physiology, 2nd ed. 2014.)
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![](/view/journals/anpr/67/4/inline-i0003-3006-67-4-214-f01.png)
![<bold>Figure 2. </bold>](/view/journals/anpr/69/1/inline-i0003-3006-69-1-24-f02.png)
Flowchart of enrollment, allocation, and data analysis. 1 Change to another sedative because of not following preoperative fasting period; 2 intravenous (IV) access failure (twice; n = 1); 3 IV access failure (twice; n = 1) and trouble with heart rate variability (HRV) measurement equipment (n = 2).