Emergence TimeNCT07675993
Effects of Preoperative Sleep Disorders on Perioperative Anesthesia Depth and Recovery Quality in Patients Undergoing Noncardiac Surgery
An observational study of Emergence Time, run by General Hospital of Ningxia Medical University at 1 site in China.
Trial summary
A Single-Center, Prospective Observational Cohort Study Comparing Perioperative Electroencephalographic Anesthesia Depth Parameters (Electroencephalographic Index, SE/RE Entropy, Burst Suppression Ratio) Between Patients With Preoperative Sleep Disorders and Those Without; To Identify the Independent Effects of… Read more about this study
- Who is it for?
- Ages 18 to 65 years
- Conditions the study is for
- Emergence Time
- What is being tested?
- Exposed cohort (sleep disorder group)
- How many people
- 80 participants
- Where
- 1 siteChina
- Study dates
- 16 Jun 2026to 31 Jan 2027
- Phase
- Observational
- Are there results?
- Not yet: the study is under way
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 to 65 years
- All sexes
- No healthy volunteers
- Adult, Older adult
Study population: Patients scheduled for elective non-cardiac surgery under general anesthesia at our hospital will be enrolled in this study.
Who may be able to join
- - Aged 18 to 65 years, with American Society of Anesthesiologists (ASA) physical status classification Ⅰ-Ⅲ;
- Elective non-cardiac surgery with an expected operative duration longer than 2 hours;
- Preoperative Mini-Mental State Examination (MMSE) score ≥ 24;
- Completion of the Pittsburgh Sleep Quality Index (PSQI) assessment 1 day before surgery;
- Absence of severe cardiac, hepatic, renal or cerebral diseases, and no history of psychiatric or neurological disorders;
- Voluntary provision of written informed consent.
Who cannot join
- Preoperative severe cognitive dysfunction, history of traumatic brain injury or stroke;
- Long-term regular use of sedative-hypnotics, antidepressants or antipsychotics;
- Intraoperative massive hemorrhage, cardiac arrest, or severe hypoxemia (SpO₂ < 90% lasting for more than 5 minutes);
- Inability to cooperate with EEG monitoring or scale evaluation;
- Pregnancy or breastfeeding status.
- Drop-out Criteria :
Show all 11Show fewer
- Cancellation of scheduled surgery/anesthesia or postoperative admission to the intensive care unit (ICU);
- Patient withdrawal of study participation;
- Intraoperative massive hemorrhage, cardiac arrest, or severe hypoxemia (SpO₂ < 90% lasting for more than 5 minutes);
- Development of severe postoperative complications;
- Incomplete data collection or voluntary trial withdrawal.
Trial locations and contacts
1 site in 1 country. Contact the study team or a site near you to ask about taking part.
Li Xin Ni, Doctoral contact
China1 site, 1 recruiting
- Recruiting
General hospital of Ningxia medical university
Yinchuan, Ningxia, 750001
Na Zhao, Doctoral Candidate, 86-951-674-3252, 18995096494@163.com
Li Xin Ni, Doctoral, 86-951-674-3252
About this study
Official title: Effects of Preoperative Sleep Disorders on Perioperative Anesthesia Depth and Recovery Quality in Patients Undergoing Noncardiac Surgery: A Single-Center, Prospective, Observational Cohort Study
A Single-Center, Prospective Observational Cohort Study Comparing Perioperative Electroencephalographic Anesthesia Depth Parameters (Electroencephalographic Index, SE/RE Entropy, Burst Suppression Ratio) Between Patients With Preoperative Sleep Disorders and Those Without; To Identify the Independent Effects of Preoperative Sleep Disorders on the Speed of Electroencephalographic Recovery During Emergence, Electroencephalographic Status at Extubation, Intra-PACU Electroencephalographic Fluctuations, and Quality of Emergence.
Read the detailed description
Preoperative sleep disorder is a common perioperative comorbidity. It impairs central nervous system stability and anesthetic drug metabolism, delays postoperative recovery, and is strongly associated with delayed emergence from general anesthesia, emergence agitation, and postoperative cognitive decline. Electroencephalographic (EEG) monitoring enables continuous, quantitative assessment of anesthetic depth (including EEG index, entropy, and burst suppression ratio), which can reflect central nervous depression more sensitively than conventional vital sign monitoring. To date, there is a lack of evidence based on complete preoperative-intraoperative-postoperative continuous EEG data to clarify the correlations between sleep disorders, anesthetic depth, and emergence quality. This prospective cohort study will collect full-course EEG parameters throughout the perioperative period to identify the effects of preoperative sleep disorders on the stability of anesthetic depth, EEG recovery during emergence, and adverse emergence events, so as to provide evidence-based references for perioperative cerebral protection and precision anesthetic management.
Primary Outcome Measures Preoperative \& Postoperative Polysomnography (PSG) indicators: Sleep Efficiency Index (SEI), Total Sleep Time (TST), Arousal Index (AI), and the proportional percentages of N1, N2, N3 stages within NREM sleep and REM sleep; assessments conducted on the night after surgery, postoperative Day 1 and postoperative Week 1.Intraoperative EEG parameters: mean value of EEG index, minimum EEG index value, cumulative duration when EEG index < 40, maximum Burst Suppression Ratio (BSR).Emergence-phase EEG indicators: recovery time of EEG index, EEG index at extubation, standard deviation of EEG fluctuation in Post-Anesthesia Care Unit (PACU).Emergence quality indicators: extubation time, PACU length of stay, incidence of emergence agitation.
Serum Brain-Derived Neurotrophic Factor (BDNF) levels collected at preoperative, intraoperative and postoperative time points.
- Conditions
- Emergence Time
- Being tested
- Exposed cohort (sleep disorder group), Control cohort (non-sleep disorder group)
- Keywords
- sleep disorders, sevoflurane anesthesia, delayed emergence
- Medical subject headings
- Sleep Wake Disorders
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Exposed cohort (sleep disorder group)Combination product
All participants receive standardized sevoflurane-based general anesthesia for elective non-cardiac surgery. Continuous perioperative electroencephalographic (EEG) monitoring is performed throughout induction, maintenance and emergence phase. Serial scale assessments including PSQI, PSG, MMSE, NRS and delirium evaluation, as well as serial serum BDNF testing are conducted at designated perioperative time points. This cohort consists of patients with preoperative Pittsburgh Sleep Quality Index (PSQI) score ≥ 7, defined as preoperative sleep disorders.
Control cohort (non-sleep disorder group)Combination product
All participants receive identical standardized sevoflurane-based general anesthesia and continuous full-course EEG monitoring during elective non-cardiac surgery. Uniform perioperative scale assessments (PSQI, PSG, MMSE, NRS, postoperative delirium screening) and serial serum BDNF detection are completed at unified time nodes. This control cohort includes patients with preoperative Pittsburgh Sleep Quality Index (PSQI) score < 7 without preoperative sleep disturbance.
| Study group | Role | What they receive |
|---|---|---|
| Exposed cohort (sleep disorder group) | Patients with preoperative Pittsburgh Sleep Quality Index (PSQI) score ≥7. Receives: Combination Product: Exposed cohort (sleep disorder group) | |
| Control cohort (non-sleep disorder group) | Patients with preoperative Pittsburgh Sleep Quality Index (PSQI) score <7. Receives: Combination Product: Control cohort (non-sleep disorder group) |
What is being measured
The primary outcome is the main question the study is designed to answer.
Emergence Time
Time to emergence from anesthesia:the time interval from discontinuation of anesthetics to patient awakening
Measured: "perioperative"
Time for recovery of EEG index
The EEG index recovery time during emergence was monitored using the Misamo depth-of-anesthesia monitor. The awake judgment thresholds were set as SE ≥ 85 and RE ≥ 90.
Shorter recovery time indicates rapid elimination of anesthetic suppression in the cerebral cortex and smoother emergence; significantly prolonged recovery time suggests accumulation of anesthetics and excessive cerebral cortical suppression.
Start point: Discontinuation of maintenance doses of propofol, sevoflurane and remifentanil (rescue analgesics alone are not counted as the drug withdrawal start time).
End point: The EEG index steadily reaches the awake threshold without decline for 10p
Measured: Perioperative
Secondary outcomes (4)
Dosage of anesthetics:
Dosage of anesthetics: total consumption of propofol, remifentanil and sevoflurane administered from anesthesia induction to emergence.
Measured: Perioperative
incidence of postoperative delirium
Postoperative delirium was assessed using the Confusion Assessment Method (CAM), which evaluates four dimensions: 1. acute fluctuating course; 2. inattention; 3. disorganized thinking; 4. altered level of consciousness. Higher CAM scores indicate more severe delirium.
Score 0: No delirium Score 1-2: Subsyndromal delirium (mild early stage) Score ≥3: Confirmed delirium Score 5-7: Severe delirium
Measured: CAM assessments were performed and recorded on postoperative Day 1, Day 3 and Day 7.
Numerical Rating Scale (NRS) pain score
The Numerical Rating Scale (NRS) was adopted to evaluate the postoperative pain trend from postoperative Day 1 to Day 7. Higher NRS scores indicate more severe pain.Scores of 1-3 indicate mild pain, 4-7 moderate pain, and 8-10 severe pain.
Measured: Pain scores were recorded immediately after surgery and daily from postoperative Day 1 to Day 7.
Incidence of postoperative nausea and vomiting (PONV)
Grade 0 No nausea or vomiting Normal Grade 1 Nausea only, no vomiting or retching Mild PONV Grade 2 Retching or intermittent vomiting, less than 2 episodes Moderate PONV Grade 3 Frequent vomiting (≥2 episodes) with gastric contents ejection Severe PONV requiring pharmacological intervention For patients with Grade 2 or above PONV, the event shall be recorded in the Adverse Event section of the CRF, with a notation on whether antiemetics are administered.
Measured: PONV assessments were conducted upon emergence from anesthesia after surgery, and on postoperative Day 1, Day 2 and Day 3.
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted30 Jun 2026
- Study start16 Jun 2026
- Primary completion31 Jan 2027 (estimated)
- Study completion31 Jan 2027 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Emergence TimeStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Observational
- Observational model
- Cohort
- Time perspective
- Cross-sectional
- Enrolment
- 80 participants (estimated)
Sponsor and investigators
- Lead sponsor
- General Hospital of Ningxia Medical University
- Sponsor type
- University, hospital or other
- Responsible party
- Sponsor
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT07675993
- Sponsor's protocol ID
- ZN-2026-0615
- Status last verified
- Jun 2026
- First submitted
- 16 Jun 2026
- Last updated
- 30 Jun 2026
- Results posted
- No
- Data monitoring committee
- Yes
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- No
Study at a glance
From the registry record, last updated by the sponsor on 30 Jun 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Effects of Preoperative Sleep Disorders on Perioperative Anesthesia Depth and Recovery Quality in Patients Undergoing Noncardiac Surgery: A Single-Center, Prospective, Observational Cohort Study
- ClinicalTrials.gov ID
- NCT07675993
- Acronym / sponsor ID
- ZN-2026-0615
- Conditions
- Emergence Time
- Keywords
- sleep disorders, sevoflurane anesthesia, delayed emergence
- Study type
- Observational
- Recruitment status
- Recruiting
- Enrolment
- 80 participants (estimated)
- Lead sponsor
- General Hospital of Ningxia Medical UniversityUniversity, hospital or other
- Study start
- 16 Jun 2026 (actual)
- Primary completion
- 31 Jan 2027 (estimated)
- Study completion
- 31 Jan 2027 (estimated)
- First posted
- 30 Jun 2026 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
A Single-Center, Prospective Observational Cohort Study Comparing Perioperative Electroencephalographic Anesthesia Depth Parameters (Electroencephalographic Index, SE/RE Entropy, Burst Suppression Ratio) Between Patients With Preoperative Sleep Disorders and Those Without; To Identify the Independent Effects of Preoperative Sleep Disorders on the Speed of Electroencephalographic Recovery During Emergence, Electroencephalographic Status at Extubation, Intra-PACU Electroencephalographic Fluctuations, and Quality of Emergence.
Detailed description
Preoperative sleep disorder is a common perioperative comorbidity. It impairs central nervous system stability and anesthetic drug metabolism, delays postoperative recovery, and is strongly associated with delayed emergence from general anesthesia, emergence agitation, and postoperative cognitive decline. Electroencephalographic (EEG) monitoring enables continuous, quantitative assessment of anesthetic depth (including EEG index, entropy, and burst suppression ratio), which can reflect central nervous depression more sensitively than conventional vital sign monitoring. To date, there is a lack of evidence based on complete preoperative-intraoperative-postoperative continuous EEG data to clarify the correlations between sleep disorders, anesthetic depth, and emergence quality. This prospective cohort study will collect full-course EEG parameters throughout the perioperative period to identify the effects of preoperative sleep disorders on the stability of anesthetic depth, EEG recovery during emergence, and adverse emergence events, so as to provide evidence-based references for perioperative cerebral protection and precision anesthetic management.
Primary Outcome Measures Preoperative \& Postoperative Polysomnography (PSG) indicators: Sleep Efficiency Index (SEI), Total Sleep Time (TST), Arousal Index (AI), and the proportional percentages of N1, N2, N3 stages within NREM sleep and REM sleep; assessments conducted on the night after surgery, postoperative Day 1 and postoperative Week 1.Intraoperative EEG parameters: mean value of EEG index, minimum EEG index value, cumulative duration when EEG index < 40, maximum Burst Suppression Ratio (BSR).Emergence-phase EEG indicators: recovery time of EEG index, EEG index at extubation, standard deviation of EEG fluctuation in Post-Anesthesia Care Unit (PACU).Emergence quality indicators: extubation time, PACU length of stay, incidence of emergence agitation.
Serum Brain-Derived Neurotrophic Factor (BDNF) levels collected at preoperative, intraoperative and postoperative time points.
Study design
- Observational model
- Cohort
- Time perspective
- Cross-sectional
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| Exposed cohort (sleep disorder group) | – | Combination Product: Exposed cohort (sleep disorder group)Patients with preoperative Pittsburgh Sleep Quality Index (PSQI) score ≥7. |
| Control cohort (non-sleep disorder group) | – | Combination Product: Control cohort (non-sleep disorder group)Patients with preoperative Pittsburgh Sleep Quality Index (PSQI) score <7. |
Who may qualify
- Ages
- 18 to 65 years
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
- Study population
- Patients scheduled for elective non-cardiac surgery under general anesthesia at our hospital will be enrolled in this study.
Key inclusion criteria (6 listed)
- - Aged 18 to 65 years, with American Society of Anesthesiologists (ASA) physical status classification Ⅰ-Ⅲ;
- Elective non-cardiac surgery with an expected operative duration longer than 2 hours;
- Preoperative Mini-Mental State Examination (MMSE) score ≥ 24;
- Completion of the Pittsburgh Sleep Quality Index (PSQI) assessment 1 day before surgery;
- Absence of severe cardiac, hepatic, renal or cerebral diseases, and no history of psychiatric or neurological disorders;
Key exclusion criteria (11 listed)
- Preoperative severe cognitive dysfunction, history of traumatic brain injury or stroke;
- Long-term regular use of sedative-hypnotics, antidepressants or antipsychotics;
- Intraoperative massive hemorrhage, cardiac arrest, or severe hypoxemia (SpO₂ < 90% lasting for more than 5 minutes);
- Inability to cooperate with EEG monitoring or scale evaluation;
- Pregnancy or breastfeeding status.
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Exposed cohort (sleep disorder group)All participants receive standardized sevoflurane-based general anesthesia for elective non-cardiac surgery. Continuous perioperative electroencephalographic (EEG) monitoring is performed throughout induction, maintenance and emergence phase. Serial scale assessments including PSQI, PSG, MMSE, NRS and delirium evaluation, as well as serial serum BDNF testing are conducted at designated perioperative time points. This cohort consists of patients with preoperative Pittsburgh Sleep Quality Index (PSQI) score ≥ 7, defined as preoperative sleep disorders. | Combination product | Exposed cohort (sleep disorder group) |
| Control cohort (non-sleep disorder group)All participants receive identical standardized sevoflurane-based general anesthesia and continuous full-course EEG monitoring during elective non-cardiac surgery. Uniform perioperative scale assessments (PSQI, PSG, MMSE, NRS, postoperative delirium screening) and serial serum BDNF detection are completed at unified time nodes. This control cohort includes patients with preoperative Pittsburgh Sleep Quality Index (PSQI) score < 7 without preoperative sleep disturbance. | Combination product | Control cohort (non-sleep disorder group) |
Primary outcome
Emergence Time
Time frame: "perioperative"
Time to emergence from anesthesia:the time interval from discontinuation of anesthetics to patient awakening
Time for recovery of EEG index
Time frame: Perioperative
The EEG index recovery time during emergence was monitored using the Misamo depth-of-anesthesia monitor. The awake judgment thresholds were set as SE ≥ 85 and RE ≥ 90. Shorter recovery time indicates rapid elimination of anesthetic suppression in the cerebral cortex and smoother emergence; significantly prolonged recovery time suggests accumulation of anesthetics and excessive cerebral cortical suppression. Start point: Discontinuation of maintenance doses of propofol, sevoflurane and remifentanil (rescue analgesics alone are not counted as the drug withdrawal start time). End point: The EEG index steadily reaches the awake threshold without decline for 10p
4 secondary outcomes
Dosage of anesthetics:
Time frame: Perioperative
incidence of postoperative delirium
Time frame: CAM assessments were performed and recorded on postoperative Day 1, Day 3 and Day 7.
Numerical Rating Scale (NRS) pain score
Time frame: Pain scores were recorded immediately after surgery and daily from postoperative Day 1 to Day 7.
Incidence of postoperative nausea and vomiting (PONV)
Time frame: PONV assessments were conducted upon emergence from anesthesia after surgery, and on postoperative Day 1, Day 2 and Day 3.
Results and safety
This study is still under way. Results are not available in the source record yet.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 30 Jun 2026.
- Individual participant dataSharing planned: No
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part.
Li Xin Ni, Doctoral contact
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
An observational study of Emergence Time, run by General Hospital of Ningxia Medical University at 1 site in China.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 6 inclusion and 11 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: looking for participants now, as of the sponsor's last update on 30 Jun 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in China. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
This study is still under way. Results are not available in the source record yet.
How can a doctor refer a patient or contact the research team?
Contact NA Zhao, Doctoral Candidate (86-951-674-3252, 18995096494@163.com), or a site near the patient. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Emergence Time (time frame: "perioperative"). The study lists 2 primary outcomes in all. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 30 Jun 2026.