The purpose of this study is to assess the influence of extracorporeal circulation during cardiac surgery on the optic nerve sheath diameter (ONSD) after the surgery.
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Ultrasound measuring of optic nerve sheath diameter baseline
Timeframe: Before start of surgery
Ultrasound measuring of optic nerve sheath diameter end of surgery
Timeframe: 1 hour after the end of surgery
Ultrasound measuring of optic nerve sheath diameter day 1
Timeframe: day 1 after the surgery