Based on the patient's heart rate variability, the analgesia nociception index (ANI) measures the activity of the autonomic nervous system and the sympathetic/parasympathetic nervous system and expresses it as a numerical value through a specific algorithm. The investigators will analyze it and see if it has the ability to predict severe hypotension following spinal anesthesia.
Study Type
OBSERVATIONAL
Enrollment
50
The ANI monitor starts lying on the bed in the waiting area before entering the operating room, and the monitoring period should be at least 15 minutes. After entering the operating room, monitoring begins again and is maintained during the operation.
Seoul National University Bundang Hospital
Seongnam-si, Gyeonggi-do, South Korea
The change of averaged value
The change of averaged value presented in ANI monitor
Time frame: 15 min, 10 min and 5 min before entering the operating room; every 5 min after entering the operating room
The change of instantaneous value
The change of instantaneous value presented in ANI monitor
Time frame: 15 min, 10 min and 5 min before entering the operating room; every 5 min after entering the operating room
Total dose of injected phenylephrine
Time frame: During the anesthesia (from initiation of anesthesia until the end of anesthesia)
Total dose of injected glycopyrrolate
Time frame: During the anesthesia (from initiation of anesthesia until the end of anesthesia)
The change of systolic blood pressure
Time frame: Every 1 min after entering the operating room until finishing the operation
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