Clinical trial NCT04595591: Observation of Propofol Titration at Different Speeds
Official title: Effects of Propofol Titration at Different Speeds on Hemodynamics and Stress During General Anesthesia Induction
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: NA
Conditions: Anesthesia, General
Hemodynamics
Keywords: titration of propofol
Lead sponsor: Sixth Affiliated Hospital, Sun Yat-sen University
Sponsor class: OTHER
First posted: 2020-10-20
Enrollment: 276
Sex: ALL
Minimum age (years): 18
Maximum age (years): 60
Standard ages: ADULT
Accepts healthy volunteers: no
Allocation: RANDOMIZED
Intervention model: PARALLEL
Primary purpose: TREATMENT

Brief summary: Propofol is one of the most widely used anesthetics for its fast onset and quick elimination. The conventional speed of its induction dose often causes severe hemodynamics fluctuations with hypotension and arrhythmia. The recommended dosage on the drug insert comes from group pharmacokinetic studies which does not apply to the specific situation of every patient, so the investigators emphasize individualized medication. The investigators have observed the titration of propofol in general anesthesia induction, and found that the dosage was less and the hemodynamics was becoming more stable. At the same time, the investigators found that the hemodynamics still has obvious fluctuations in the titration of the administration rate recommended in the instructions. The investigators intend to further compare the effects of propofol titration administration at different rates for hemodynamics and stress during the induction period of general anesthesia, and find a safer and more appropriate rate of administration.

Detailed description: Based on the recommended dosing speed in the propofol instructions, this research protocol further reduces the dosing speed (40 mg administered every 10 seconds), and sets three different titration dosing speeds: group I 2 mg/kg/min; group II 1 mg /kg/min; group III 0.5 mg/kg/min. The program is calculated by statistics, and it will be planned to enroll 276 participants undergoing elective surgery under general anesthesia with oral endotracheal intubation, and randomly divided into 3 groups according to a random number table, with 92 cases in each group. When participants reach the titration endpoint (OAAS score 1 point) during the titration of propofol in the induction, the investigators stop the dosing and switch to a maintenance dose, and give rocuronium 0.15 mg/kg and remifentanil 2 ug/kg; 2 minutes later the chief anesthetist performs tracheal intubation. The investigators will observe hemodynamics changes and brain electrical activity throughout the process, and adjust the drugs according to the blood pressure to make the hemodynamics as stable as possible.

After confirming the successful tracheal intubation, the investigators will give participants machine-controlled ventilation, and the total intravenous anesthesia (TIVA) will be given with propofol, remifentanil, and cis-atracurium. During the operation, remifentanil will be injected with a constant rate of 0.2ug/kg/min, and propofol will be injected with a fluctuating rate of 2-8mg/kg/h (the pump injection rate will be adjusted according to blood pressure and BIS, and the rate of remifentanil can be adjusted if necessary) to maintain BIS between 40-60.Fluid therapy will be performed according to the participants' hemodynamics and intraoperative conditions. After extubation, participants will be sent to the postoperative recovery room; a follow-up visit will be performed the next day, and a telephone return visit will be performed on the 30th day.

The investigators record the visual analogue scale(VAS) score for preoperative anxiety of each participant, bispectral index (BIS) and hemodynamics of patients when participants reach different stages of sedation as determined by the Observer's Assessment of Alertness/Sedation Scale (OAAS) score, and the lowest value and specific time of mean blood pressure(MBP) and BIS during induction of anesthesia；the investigators record various parameters at the following time points(10 minutes after entering the operating room before propofol administration, every minute after administration until intubation, immediately after tracheal intubation, and 1, 2, 4, 6, 8, 10, 20 min after intubation), and parameters include: systolic blood pressure(SBP) , diastolic blood pressure(DBP), MBP, heart rate(HR), electrocardiogram ST-T changes (V1), BIS, cardiac function parameters (heart rate variability(HRV), stroke volume (SV), stroke index(SVI), cardiac output (CO), cardiac index(CI) ), oxygen delivery parameters (oxygen delivery (DO2), oxygen delivery index (DO2I)), peripheral vascular resistance parameters (systemic vascular resistance (SVR), systemic vascular resistance index (SVRI)), volume parameters (stroke volume variation(SVV), pulse pressure variation (PPV), increase in stroke volume(△SV)); the investigators record the time for each participant reach the titration endpoint and the amount of propofol used, the time from the start of induction to the completion of the tracheal intubation and the amount of propofol, and the total amount of propofol during the operation.

The investigators record invasive blood during the trial, and use cameras to video the entire process of anesthesia induction.

The 11-30th participants in each group will be given arterial blood samples at 1, 3, 5, and 7 minutes after the administration of propofol to measure the blood concentration of propofol; when rocuronium is given and 30 seconds after the completion of tracheal intubation, venous blood will be drawn to measure the catecholamine concentration; ten cases of propofol with high, medium and low sensitivity will be selected for transcriptome RNA sequencing; Single nucleotide polymorphism（SNP） analysis of propofol-related genes in special cases.

During the induction period, the investigators will monitor EEG of the left and right frontal, temporal and occipital lobes, and analyze the power spectrum of β, α, θ, and σ brain waves; observe the pupil reflex and auditory evoked potential(brain stem auditory evoked potentials(BAEP): the incubation period and amplitude of III, V ; middle latency auditory evoked potentials（MLAEP）: the incubation period and amplitude of Pa, Nb) before induction , when the titration endpoint reaches and after finishing intubation.

Blind design:

The observer performs pre-entry screening, and does not know the group of participants during the induction process. The anesthesia nurse receives the experiment envelope in advance, adjusts the infusion pump according to the group, and adjusts the pump to the position facing away from the observer and the chief anesthetist. The chief anesthetist communicates with patients and performs OAAS scores scoring. When the titration endpoint reaches, the anesthesia nurse will stop propofol administer and shift to the maintenance dose, following the observer's order to add vasoactive drugs or propofol during the induction process, and do not participate in the postoperative follow-up work. The chief anesthetist (working for more than 3 years) is responsible for assisted ventilation and tracheal intubation. The anesthesiologist in the resuscitation room, the patient, and the post-operative return visitor do not know the group of the participant.

Eligibility criteria: Inclusion Criteria:

1. Age 18-60 Years old
2. Elective surgery for general anesthesia through oral tracheal intubation and surgery is expected to last more than 2 hours
3. The American Society of Anesthesiologists(ASA) grade is I or II, and the cardiac function is 1-2;
4. Body mass index (BMI) 18-30 kg/m2;

Exclusion Criteria:

1. Patients have severe heart, lung, liver, and kidney diseases (heart function grade\>3 / respiratory failure / liver failure / renal failure)
2. Patients with arrhythmia: sinus bradycardia (ventricular rate \<60 beats/min), atrial fibrillation, atrial flutter, atrioventricular block, frequent ventricular premature, multi-source ventricular premature, ventricular premature R on T, Ventricular fibrillation and ventricular flutter.
3. Patients who are expected to be difficult to intubate, hypoalbuminemia(albumin is less than 35g/L), hypertension and diabetes;
4. Patients with a higher risk of reflux and aspiration, such as full stomach, gastrointestinal obstruction, gastroparesis, and pregnant women;
5. Patients have schizophrenia, epilepsy, Parkinson's disease, intellectual disability, hearing impairment, abnormal EEG, etc.;
6. Patients who take sedative and analgesic drugs for a long time;
7. Patients who are allergic to propofol or its fat emulsion;
8. Patients who are participating in other clinical trials, and who refuse to sign informed consent.

Primary outcomes:
measure: Mean blood pressure(MBP)
timeFrame: During the procedure of anesthesia induction
Secondary outcomes:
measure: Stroke Volume (SV)
timeFrame: During the procedure of anesthesia induction
measure: Cardiac Output (CO)
timeFrame: During the procedure of anesthesia induction
measure: Systemic Vascular Resistance (SVR)
timeFrame: During the procedure of anesthesia induction
measure: Catecholamine
timeFrame: During the procedure of anesthesia induction
measure: Plasma concentration change curves
timeFrame: During the procedure of anesthesia induction
measure: The relative level of mRNA in serum
timeFrame: Baseline
measure: Brain electrical activity
timeFrame: During the procedure of anesthesia induction
measure: The dosage of propofol
timeFrame: Through anesthesia completion, an average of 3 hours.
measure: Induction time
timeFrame: Through anesthesia completion, an average of 3 hours.
measure: Recovery time
timeFrame: Through anesthesia completion, an average of 3 hours.
measure: The occurrence of important cardiovascular events
timeFrame: One month after finish operation
Other outcomes:
Locations:
city: Guangzhou
country: China
facility: the Sixth Affiliated Hospital, Sun Yat-sen University
state: Guangdong
Study officials:
affiliation: The Sixth Affiliated Hospital, Sun Yat-sen University
name: SanQing Jin, MD
role: PRINCIPAL_INVESTIGATOR
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