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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.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| normal pregnancy | Adult pregnant women scheduled for cesarean section under spinal anesthesia |
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| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| analgesia nociception index (ANI) monitoring | Other | 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. |
| Measure | Description | Time Frame |
|---|---|---|
| The change of averaged value | The change of averaged value presented in ANI monitor | 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 | 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 | During the anesthesia (from initiation of anesthesia until the end of anesthesia) | |
| Total dose of injected glycopyrrolate | During the anesthesia (from initiation of anesthesia until the end of anesthesia) | |
| The change of systolic blood pressure | Every 1 min after entering the operating room until finishing the operation |
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Inclusion Criteria:
Exclusion Criteria:
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Adult pregnant women scheduled for cesarean section under spinal anesthesia
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| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Seoul National University Bundang Hospital | Seongnam-si | Gyeonggi-do | 13620 | South Korea |
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