ED50, Knee Arthroplasty, Sedation
Conditions
Brief summary
Regional anesthesia is a common clinical anesthesia method, and regional anesthesia-assisted sedation play a central role in promoting patient comfort and relieving anxiety. With increasing age, elderly people experience changes in pharmacokinetics and pharmacodynamics and increased drug sensitivity. Ciprofol has advantages in adverse events such as hypotension and respiratory depression. There are fewer studies on the recommended dosage of ciprofol-assisted sedation for intrathecal anesthesia in elderly patients. The aim of study is to identify the median effective dose(ED50) of ciprofol-assisted sedation in elderly patients undergoing spinal anesthesia
Detailed description
Select the patients who received knee arthroplasty in the Second Hospital of Shanxi Medical University. The patients received a loading dosage of 0.05mg/kg of ciprofol to begin sedation following the completion of intravertebral anesthesia, and the maintenance dose is calculated using the sequential method. Based on the relevant literature and pilot study, 0.2 mg·kg-1·h-1 is selected as initial test dose with a dose gradient of 0.02 mg·kg-1·h-1. The Modified Alertness Sedation Score (MOAA/S ) scores and the bispectral index (BIS) were recorded for patients before administration (T0), 5 min after administration (T1), 10 min after administration (T2), 20 min after administration (T3), 30 min after administration (T4), 45 min after administration (T5), and 60min after administration (T6). If the first patient had ≥ 4 time points with MOAA/A score ≤3 and BIS\<85 from T0-T6, the sedation was regarded as satisfactory, then the next patient 's dose of ciprofol was reduced by one level. On the contrary, if the patient's MOAA/S score and BIS at T0-T6 had less than 4 points of MOAA/S ≤3 points and BIS \<85, it was regarded as unsatisfactory sedation. The next patient's dose of ciprofol was increased by one level. After 8 crossovers, the trial was terminated. At the same time, the change of vital signs and adverse reactions before and after administration were recorded
Interventions
DRUGCiprofol
Ciprofol was injected intravenously, and was pumped during operation to maintain sedation
Sponsors
Second Hospital of Shanxi Medical University
Study design
Allocation
NA
Intervention model
SEQUENTIAL
Primary purpose
OTHER
Masking
NONE
Eligibility
Sex/Gender
ALL
Age
65 Years to No maximum
Healthy volunteers
No
Inclusion criteria
* Age ≥ 65 years * ASA grade I\ III * BMI 18\ 30 kg/m2
Exclusion criteria
* Contraindications to intrathecal anesthesia * Suffering from severe psychiatric or neurologic disorders or taking sedative drugs within the last 3 months * Difficult airway or having respiratory diseases such as upper airway obstruction * Severe cardiovascular system diseases * Severe hepatic or renal dysfunction * Allergy or contraindication to propofol and its drug-related components * Patient Prefusal
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Bispectral index (BIS) | 24 hours | Changes in Bispectral index |
| Modified Alertness Sedation Score (MOAA/S) | 24 hours | Changes in Modified Alertness Sedation Score |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| diastolic blood pressure（DBP） | 24 hours | Changes in diastolic blood pressure |
| pulse oxygen saturation（SpO2） | 24 hours | changes in pulse oxygen saturation |
| heart rate (HR) | 24 hours | changes in heart rate |
| systolic blood pressure （SBP） | 24 hours | Changes in systolic blood pressure |
Other
| Measure | Time frame | Description |
|---|---|---|
| Occurrence of Sedation-related adverse events | 72 hours | It includes intraoperative and postoperative sedation-related adverse events |
Countries
China
Outcome results
None listed