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The purpose of the study is to investigate whether there is a correlation between the vegetative stress evaluated by the State-Trait-Anxiety-Inventory (STAI-Test) and the measurement of heart rate variability (HRV). A subgroup analysis will also be performed to determine whether premedication contributes to a lower STAI score and/or heart rate variability. The primary outcome will be the parameter of frequency-based analysis Low Frequency (LF) and High Frequency (HF), and the STAI score. Secondary outcomes are the parameters Low Frequency/High Frequency-ratio (LF/HF-ratio), Standard deviation of normal-to-normal (NN) intervals (SDNN), Root Mean Square of successive differences" (RMSSD) and mean heart rate, age, gender, if they are smokers and if they work in shifts.
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