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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State and Trait Anxiety Inventory (STAI-score)
Timeframe: First questionnaire is given 40 minutes before transfer to the holding area and the second questionnaire postoperative in the recovery ward directly before transfer back to ward
The measurement method of heart rate variability (especially the parameter of the frequency domain Low Frequency and High Frequency
Timeframe: One measurement (3-6 hours), start of measurement together with the first STAI questionnaire (40 min before transfer to the holding area), end of measurement after the second STAI questionnaire is done.