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Predicted effect compartment concentration of thiopental at loss of eyelash reflex

Lim TA, Inbasegaran K

Br J Anaesth, 2001 Mar;86(3):422-4.
PMID: 11573534

We derived the predicted effect compartment concentration of thiopental, at loss of the eyelash reflex, following three different injection regimens. Sixty patients were given thiopental for induction of anaesthesia. Twenty patients received multiple small boluses, 20 patients received a single bolus and 20 patients received an infusion. Computer simulation was then used to derive the effect compartment concentration. The median concentration was not significantly different between the three groups. EC50, derived after combining all three groups was 11.3 microg ml(-1). The EC05-EC95 range was 6.9-18.3 microg ml(-1), suggesting wide inter-individual variation.

Matched MeSH terms: Anesthetics, Intravenous/administration & dosage*; Anesthetics, Intravenous/pharmacokinetics; Anesthetics, Intravenous/pharmacology
The use of evipan sodium in obstetrics

Goh TW

Journal of the Malaya Branch of the British Medical Association, 1939;3:283-85.

Matched MeSH terms: Anesthetics, Intravenous
Effects of MDR1 and OPRM1 genetic polymorphisms on the pharmacodynamics of propofol-remifentanil TIVA in pediatrics

Liew Y, Capule FR, Rahman RA, Nor NM, Teo R, Makmor-Bakry M

Pharmacogenomics, 2023 Apr;24(5):247-259.
PMID: 36999508 DOI: 10.2217/pgs-2023-0006

Aims: To investigate the roles of MDR1 (1236C>T, 2677G>T/A, and 3435C>T) and OPRM1 (118A>G) gene polymorphisms on the anesthetic and adverse effects of propofol-remifentanil total intravenous anesthesia in pediatric surgery. Materials & methods: The genotypes were identified through Sanger sequencing. The clinical data including hemodynamics on anesthesia, postanesthesia pain and sedation score and the occurrence of adverse effects were recorded and compared against the genetic data. Results: A total of 72 pediatric patients undergoing surgery were recruited. A weak to no association was found between the genetic polymorphisms of MDR1 and OPRM1 and the anesthetic and adverse effects of propofol-remifentanil. Conclusion: Genetic polymorphisms in OPRM1, but not in MDR1, gene polymorphism, demonstrated plausible association with the effects of propofol-remifentanil.

Matched MeSH terms: Anesthetics, Intravenous/adverse effects
Pharmacokinetics of propofol infusion in Asian patients undergoing coronary artery bypass grafting

Lee HS, Khoo YM, Chua BC, Ng AS, Tan SS, Chew SL

Ther Drug Monit, 1995 Aug;17(4):336-41.
PMID: 7482686

The pharmacokinetics of propofol was studied in 11 Asian patients with fentanyl-isoflurane anaesthesia during cardiopulmonary bypass (CPB) and undergoing elective coronary artery bypass grafting (CABG). Instead of the usual increments of morphine and a benzodiazepine, propofol (4 mg/kg/h) was initiated at the start of CPB and ceased at CPB separation. Whole blood propofol concentrations were determined during and postinfusion using high-performance liquid chromatography with fluorescence detection. Data from four patients seemed to fit a two-compartment model, whereas those from seven patients were significantly (F test, p < 0.05) better fitted to a three-compartment model. The pharmacokinetic parameters were as follows: The mean (SD) of the initial distribution phase t1/2 pi, intermediate distribution phase t1/2 alpha, and elimination phase t1/2 beta were 2.22 (1.04) min, 42.9 (16.4) min, and 370 (138) min, respectively. The mean clearance of 1.31 (0.50) L/min was lower than those reported from other studies, whereas the mean blood concentration of 2.2 (1.0) mg/L at the 1-h infusion period was higher. The mean calculated apparent Css was 3.9 (1.5) mg/L. The low clearance is likely to be due to hemodynamic changes during CPB and CABG, thereby affecting drug distribution and blood flow to the liver.

Matched MeSH terms: Anesthetics, Intravenous/administration & dosage; Anesthetics, Intravenous/blood; Anesthetics, Intravenous/pharmacokinetics*
Multi-model generalised predictive control for intravenous anaesthesia under inter-individual variability

Jing CJ, Syafiie S

J Clin Monit Comput, 2021 10;35(5):1037-1045.
PMID: 32833146 DOI: 10.1007/s10877-020-00581-0

Inter-individual variability possesses a major challenge in the regulation of hypnosis in anesthesia. Understanding the variability towards anesthesia effect is expected to assist the design of controller for anesthesia regulation. However, such studies are still very scarce in the literature. This study aims to analyze the inter-individual variability in propofol pharmacokinetics/pharmacodynamics (PK/PD) model and proposed a suitable controller to tackle the variability. This study employed Sobol' sensitivity analysis to identify significance parameters in propofol PK/PD model that affects the model output Bispectral Index (BIS). Parameters' range is obtained from reported clinical data. Based on the finding, a multi-model generalized predictive controller was proposed to regulate propofol in tackling patient variability. [Formula: see text] (concentration that produces 50% of the maximum effect) was found to have a highly-determining role on the uncertainty of BIS. In addition, the Hill coefficient, [Formula: see text], was found to be significant when there is a drastic input, especially during the induction phase. Both of these parameters only affect the process gain upon model linearization. Therefore, a predictive controller based on switching of model with different process gain is proposed. Simulation result shows that it is able to give a satisfactory performance across a wide population. Both the parameters [Formula: see text] and [Formula: see text], which are unknown before anesthesia procedure, were found to be highly significant in contributing the uncertainty of BIS. Their range of variability must be considered during the design and evaluation of controller. A linear controller may be sufficient to tackle most of the variability since both [Formula: see text] and [Formula: see text] would be translated into process gain upon linearization.

Matched MeSH terms: Anesthetics, Intravenous
A novel method of deriving the effect compartment equilibrium rate constant for propofol

Lim TA

Br J Anaesth, 2003 Nov;91(5):730-2.
PMID: 14570797

BACKGROUND: Calculation of the effect compartment concentration (Ce) in non-steady-state conditions requires the equilibrium rate constant, keo. Most studies of propofol derive the keo using EEG measurements. This study investigated an alternative method. Starting from a predicted concentration-time profile, a keo value was included so that the predicted Ce at a specific pharmacodynamic end-point was the same when using three different methods of injection.
METHODS: Seventy-five patients were given propofol for induction of anaesthesia. Twenty-five patients received a single bolus, 25 patients received an infusion, and 25 patients received a bolus followed by an infusion. Computer simulation was used to derive the central compartment concentration. The keo that brought about the same value for Ce at loss of the eyelash reflex using the three methods of injection was derived.
RESULTS: Keo was found to be 0.80 min(-1). Mean (SD) Ce at loss of the eyelash reflex was 2.27 (0.69) microg ml(-1).
CONCLUSIONS: The effect compartment equilibrium rate constant and concentration at loss of the eyelash reflex can be derived without the use of electronic central nervous system monitors.

Matched MeSH terms: Anesthetics, Intravenous/administration & dosage; Anesthetics, Intravenous/blood*
Fulltext Isobolographic analysis of the hypnotic interaction between propofol and thiopental

Wong, W. H., Lim, T. A., Lim, K. Y.

Malaysian Journal of Medicine and Health Sciences, 2010;6(1):83-89.
MyJurnal

Introduction: Giving two intravenous anaesthetic agents simultaneously generally results in an additive effect. The aim of this study was to investigate the interaction between propofol and thiopental when given to patients who have had sedative premedication. Methods: Fifty patients were admitted into the study. All patients received oral midazolam 3.75 mg and intravenous fentanyl 100 mg before induction of anaesthesia. Twenty patients received an infusion of either propofol or thiopental while 30 patients received an infusion of an admixture of both drugs. Isobolographic analysis was used to determine the interaction between the two drugs. Results: The interaction between propofol and thiopental was
additive. The average dose at loss of the eyelash reflex for propofol and thiopental was 0.71 mg kg-1 and 1.54 mg kg-1 respectively. Premedication decreased the induction dose by 38.2%. Conclusion: Propofol and thiopental interact in an additive fashion when given at induction of anaesthesia.

Matched MeSH terms: Anesthetics, Intravenous
Impact of bispectral index monitoring on propofol administration in patients undergoing cardiopulmonary bypass

Chiu CL, Ong G, Majid AA

Anaesth Intensive Care, 2007 Jun;35(3):342-7.
PMID: 17591126

Propofol anaesthesia using target control infusion during cardiac surgery has become more popular recently. However, without depth of anaesthesia monitoring, the standard target concentration used may be higher than necessary to maintain adequate hypnosis during hypothermic cardiopulmonary bypass. The purpose of this study was to evaluate the effect of bispectral index monitoring on propofol administration during hypothermic cardiopulmonary bypass. After ethics committee approval and written informed consent, 20 New York Heart Association class I-III patients scheduled for elective cardiac surgery requiring hypothermic cardiopulmonary bypass were studied in this prospective randomised controlled trial. In group C, routine anaesthesia was practised, where patients received propofol at target concentration between 1.5 to 2.5 microg/ml during cardiopulmonary bypass. In group B, the target concentration was titrated to a bispectral index value of 40 to 50. Mean arterial pressure and bispectral index were recorded at various time intervals. The use of propofol, phenylephrine, sodium nitroprusside and adrenaline were recorded. The median propofol administration in group B was significantly less than that in group C (2.9 mg/kg/h compared to 6.0 mg/kg/h). The bispectral index value during bypass was significantly lower in group C than in group B, reflecting a deeper state of anaesthesia. There was no difference in the use of inotropes, vasoconstrictors or vasodilators. Bispectral index monitoring enables a 50% reduction in propofol administration at this standard dose during hypothermic cardiopulmonary bypass.

Matched MeSH terms: Anesthetics, Intravenous/administration & dosage*
Fulltext Anaesthesia for a patient with long QT syndrome undergoing renal transplantation

Lim KY, Lim TA, Wong WH

Med J Malaysia, 2005 Dec;60(5):647-9.
PMID: 16515119

Anaesthetizing patients with Long QT Syndrome is a major challenge, as the potential for sudden catastrophic cardiovascular collapse is well known. We present a 15-year-old boy with Long QT Syndrome who presented for an elective renal transplant. All electrolyte concentration abnormalities were corrected preoperative and adequate beta-blockade was maintained. The patient was given a target controlled infusion of propofol, together with opioids and atracurium. Anaesthesia was uneventful and the patient was extubated at the end of the surgical procedure.

Matched MeSH terms: Anesthetics, Intravenous/administration & dosage
The use of modified VBM laryngeal tube compared to Laryngeal Mask Airway during spontaneous ventilation

Chiu CL, Murugasu J, Chan L

Anaesth Intensive Care, 2003 Apr;31(2):187-92.
PMID: 12712784

We have compared the use of the laryngeal mask airway with the new modified laryngeal tube in a prospective randomized controlled study. Sixty ASA 1 or 2 patients, aged 18 to 65 years, scheduled for elective surgery and breathing spontaneously under general anaesthesia, were studied. After preoxygenation, anaesthesia was induced with fentanyl and propofol. The patients were randomized to receive either a laryngeal mask airway or a laryngeal tube. Anaesthesia was maintained with nitrous oxide, oxygen and isoflurane. We recorded the speed and the ease of insertion, the number of attempts needed to successfully secure the airway and intraoperative complications, such as partial airway obstruction needing airway manipulation. The airway devices were removed with the patients fully awake at the end of surgery. Systolic arterial blood pressure, heart rate and end-tidal CO2 were recorded at various time intervals. Postoperative complications were recorded. We found that the incidence of partial airway obstruction needing intraoperative airway manipulation was higher with the laryngeal tube than with the laryngeal mask airway. We conclude that during spontaneous ventilation the modified laryngeal tube is not as reliable in providing a satisfactory airway and we consider it is not a suitable alternative to the laryngeal mask airway.

Matched MeSH terms: Anesthetics, Intravenous*
Fulltext Sevoflurane induction in the elderly

Cheong KF, Teh TS

Med J Malaysia, 2001 Dec;56(4):446-50.
PMID: 12014764

The effects of 2% and 4% sevoflurane in oxygen and nitrous oxide for induction of anaesthesia in 60 unpremedicated elderly patients was compared to those obtained during an intravenous Thiopentone induction. Intravenous induction induced anaesthesia in 27 +/- 5 seconds, significantly faster than a 2% or 4% sevoflurane induction (109 +/- 36 and 71 +/- 24 seconds respectively). One patient in both the thiopentone and 2% sevoflurane groups, and 2 patients in the 4% sevoflurane group coughed during induction. The postinduction reduction in mean arterial pressure was greatest in the thiopentone group followed by the 4% and the 2% sevoflurane groups. Heart rate changes were minimal in all groups. We conclude that 2% or 4% sevoflurane offered suitable conditions for induction of anaesthesia in the elderly with minimal cardiovascular derangement.

Matched MeSH terms: Anesthetics, Intravenous/pharmacology*
Comparison of propofol and methohexitone as an induction agent in anaesthesia for electroconvulsive therapy

Lim SK, Lim WL, Elegbe EO

West Afr J Med, 1996 Oct-Dec;15(4):186-9.
PMID: 9020593

30 patients who received electroconvulsive therapy were anaesthetized with either Propofol or Methohexitone in a randomized cross-over study. Recovery times were shorter in those who received Propofol. The decrease in diastolic pressure after induction was greater with Propofol than with Methohexitone. There was a greater increase in the blood pressure after the electroconvulsive therapy in those who received Methohexitone. The duration of convulsion was similar for both agents.

Matched MeSH terms: Anesthetics, Intravenous/therapeutic use*
Bispectral index during modified rapid sequence induction using thiopentone or propofol and rocuronium

Sie MY, Goh PK, Chan L, Ong SY

Anaesth Intensive Care, 2004 Feb;32(1):28-30.
PMID: 15058117

This randomized controlled trial compared Bispectral Index (BIS) values in 40 patients after a modified rapid sequence induction using thiopentone 4 mg/kg or propofol 2 mg/kg with rocuronium 0.6 mg/kg as muscle relaxant. Endotracheal intubation was performed at 60 seconds from induction of anaesthesia and BIS values were recorded for three minutes after induction. At the 120, 150 and 180 second measurements there was a significantly greater proportion of subjects with BIS values < or = 60 ("anaesthetized") in the propofol group compared with the thiopentone group (P values < 0.02, < 0.01 and < 0.01 respectively). All intubations were completed within two minutes. No explicit recall of intubation was detected clinically with either induction agent. The BIS scores we have measured suggest that thiopentone 4 mg/kg is more likely to be associated with lighter planes of anaesthesia and consequent risk of awareness than propofol 2 mg/kg, if intubation is delayed or prolonged.

Matched MeSH terms: Anesthetics, Intravenous/pharmacology*
Fulltext Fentanyl pre-treatment alleviates pain during injection of propofol-lipuro premixed with lignocaine

Ahmad N, Zanariah Y, Balan S

Med J Malaysia, 2008 Dec;63(5):431-3.
PMID: 19803312

We studied the effect of fentanyl pretreatment on alleviating pain during the injection of Propofol-Lipuro. One hundred and seventy patients were randomly allocated to receive either 100 mcg of intravenous fentanyl or normal saline (placebo) followed by intravenous Propofol-Lipuro premixed with 20 mg lignocaine. The incidence of injection pain was 32% and 13% in the placebo and fentanyl groups, respectively. We found a statistically significant reduction in incidence of injection pain in the fentanyl group when compared with the placebo group (p<0.003). The number needed to treat was 6 (3.2< 95% CI <15.1). In conclusion, fentanyl pretreatment is effective in alleviating pain during injection of Propofol-Lipuro.

Matched MeSH terms: Anesthetics, Intravenous/administration & dosage*; Anesthetics, Intravenous/adverse effects
Preventing the withdrawal response associated with rocuronium injection: a comparison of fentanyl with lidocaine

Ahmad N, Choy CY, Aris EA, Balan S

Anesth Analg, 2005 Apr;100(4):987-990.
PMID: 15781511 DOI: 10.1213/01.ANE.0000147790.76114.3A

We compared the efficacy of IV fentanyl with IV lidocaine as pretreatment for the prevention of withdrawal response after rocuronium injection. For this prospective, randomized, placebo-controlled, double-blind study we recruited 90 patients aged between 18 and 65 yr, ASA physical status I or II, who had undergone elective surgery requiring general anesthesia and positive pressure ventilation. Patients were randomly allocated to 1 of 3 groups: group F received 2 mL IV fentanyl 50 microg/mL (100 microg), group L received 2 mL of preservative-free lidocaine 2% (40 mg), and group P (placebo) received 2 mL of normal saline. The incidence of withdrawal response after rocuronium was 57%, 30%, and 7% in the placebo, lidocaine, and fentanyl groups, respectively. We found a significant reduction in incidence of withdrawal response in both the fentanyl and lidocaine groups when compared with the placebo group (P < 0.05), with the fentanyl group being most effective (P < 0.05). In conclusion, both fentanyl and lidocaine are effective clinical treatments to alleviate the withdrawal response associated with rocuronium injection, with fentanyl being more effective.

Matched MeSH terms: Anesthetics, Intravenous/administration & dosage; Anesthetics, Intravenous/therapeutic use*
Fulltext Comparison of the Effects of Dexmedetomidine on the Induction of Anaesthesia Using Marsh and Schnider Pharmacokinetic Models of Propofol Target-Controlled Infusion

Wan Hassan WMN, Tan HS, Mohamed Zaini RH

Malays J Med Sci, 2018 Feb;25(1):24-31.
PMID: 29599632 MyJurnal DOI: 10.21315/mjms2018.25.1.4

Background: The study aimed to determine the effects of dexmedetomidine on the induction of anaesthesia using different models (Marsh and Schnider) of propofol target-controlled infusion (TCI).
Methods: Sixty-four patients aged 18-60 years, American Society of Anaesthesiologists (ASA) class I-II who underwent elective surgery were randomised to a Marsh group (n= 32) or Schnider group (n= 32). All the patients received a 1 μg/kg loading dose of dexmedetomidine, followed by TCI anaesthesia with remifentanil at 2 ng/mL. After the effect-site concentration (Ce) of remifentanil reached 2 ng/mL, propofol TCI induction was started. Anaesthesia induction commenced in the Marsh group at a target plasma concentration (Cpt) of 2 μg/mL, whereas it started in the Schnider group at a target effect-site concentration (Cet) of 2 μg/mL. If induction was delayed after 3 min, the target concentration (Ct) was gradually increased to 0.5 μg/mL every 30 sec until successful induction. The Ct at successful induction, induction time, Ce at successful induction and haemodynamic parameters were recorded.
Results: The Ct for successful induction in the Schnider group was significantly lower than in the Marsh group (3.48 [0.90] versus 4.02 [0.67] μg/mL;P= 0.01). The induction time was also shorter in the Schnider group as compared with the Marsh group (134.96 [50.91] versus 161.59 [39.64]) sec;P= 0.02). There were no significant differences in haemodynamic parameters and Ce at successful induction.
Conclusion: In the between-group comparison, dexmedetomidine reduced the Ct requirement for induction and shortened the induction time in the Schnider group. The inclusion of baseline groups without dexmedetomidine in a four-arm comparison of the two models would enhance the validity of the findings.

Matched MeSH terms: Anesthetics, Intravenous
Fentanyl dose for the insertion of Classic Laryngeal Mask Airways in non-paralysed patients induced with propofol 2.5 mg/kg

Tan AS, Wang CY

Anaesth Intensive Care, 2010 Jan;38(1):65-9.
PMID: 20191779

The aim of this randomised, controlled trial was to determine the optimum dose of fentanyl in combination with propofol 2.5 mg x kg(-1) when inserting the Classic Laryngeal Mask Airway. Seventy-five ASA I or II patients were randomly assigned to five groups of fentanyl dosage: 0 microg x kg(-1) (placebo), 0.5 microg x kg(-1), 1.0 microg x kg(-1), 1.5 microg x kg(-1) and 2.0 microg x kg(-1). Anaesthesia was induced by first injecting the study drug over 10 seconds. Three minutes after the study drug was injected, propofol (2.5 mg x kg(-1)) was injected over 10 seconds. The Classic Laryngeal Mask Airway was inserted four minutes and 30 seconds after injection of the study drug. Insertion conditions were evaluated using a four-category score. Thirty-nine males and 36 females aged 19 to 59 years were studied. The incidence of prolonged apnoea increased as fentanyl dose increased. We found that there was a high rate of successful first attempt at insertion with 1 microg x kg(-1) and 1.5 microg x kg(-1), 93% and 87% respectively, compared to 87% in the 2.0 microg x kg(-1) group. The 1.0 microg x kg(-1) group also achieved an 80% optimal insertion conditions score of 4, compared to 73% in the 1.5 microg x kg(-1) group and 80% in the 2 microg x kg(-1) group. Therefore we recommend 1.0 microg x kg(-1) as the optimal dose of fentanyl when used in addition to propofol 2.5 mg/kg for the insertion of the Classic Laryngeal Mask Airway.

Matched MeSH terms: Anesthetics, Intravenous*
Randomized double-blind comparison of ketamine-propofol, fentanyl-propofol and propofol-saline on haemodynamics and laryngeal mask airway insertion conditions

Goh PK, Chiu CL, Wang CY, Chan YK, Loo PL

Anaesth Intensive Care, 2005 Apr;33(2):223-8.
PMID: 15960405

The aim of this prospective, double-blind, randomized, placebo-controlled clinical trial was to investigate whether the administration of ketamine before induction with propofol improves its associated haemodynamic profile and laryngeal mask airway (LMA) insertion conditions. Ninety adult patients were randomly allocated to receive either ketamine 0.5 mg x kg(-1) (n = 30), fentanyl 1 microg x kg(-1) (n = 30) or normal saline (n = 30), before induction of anaesthesia with propofol 2.5 mg x kg(-1). Insertion of the LMA was performed 60s after injection of propofol. Arterial blood pressure and heart rate were measured before induction (baseline), immediately after induction, immediately before LMA insertion, immediately after LMA insertion and every minute for three minutes after LMA insertion. Following LMA insertion, the following six subjective endpoints were graded by a blinded anaesthestist using ordinal scales graded 1 to 3: mouth opening, gagging, swallowing, movement, laryngospasm and ease of insertion. Systolic blood pressure was significantly higher following ketamine than either fentanyl (P = 0.010) or saline (P = 0.0001). The median (interquartile range) summed score describing the overall insertion conditions were similar in the ketamine [median 7.0, interquartile range (6.0-8.0)] and fentanyl groups [median 7.0, interquartile range (6.0-8.0)]. Both appeared significantly better than the saline group [median 8.0, interquartile range (6.75-9.25); P = 0.024]. The incidence of prolonged apnoea (> 120s) was higher in the fentanyl group [23.1% (7/30)] compared with the ketamine [6.3% (2/30)] and saline groups [3.3% (1/30)]. We conclude that the addition of ketamine 0.5 mg x kg(-1) improves haemodynamics when compared to fentanyl 1 microg x kg(-1), with less prolonged apnoea, and is associated with better LMA insertion conditions than placebo (saline).

Matched MeSH terms: Anesthetics, Intravenous/pharmacology*
Assessment of tracheal intubating conditions in children using remifentanil and propofol without muscle relaxant

Batra YK, Al Qattan AR, Ali SS, Qureshi MI, Kuriakose D, Migahed A

Paediatr Anaesth, 2004 Jun;14(6):452-6.
PMID: 15153205

Tracheal intubation in children can be achieved by deep inhalational anaesthesia or an intravenous anaesthetic and a muscle relaxant, suxamethonium being widely used despite several side-effects. Studies have shown that oral intubation can be facilitated safely and effectively in children after induction of anaesthesia with propofol and alfentanil without a muscle relaxant. Remifentanil is a new, ultra-short acting, selective mu-receptor agonist that is 20-30 times more potent than alfentanil. This clinical study was designed to assess whether combination of propofol and remifentanil could be used without a muscle relaxant to facilitate tracheal intubation in children.

Matched MeSH terms: Anesthetics, Intravenous/administration & dosage*
Fulltext Intravenous ketamine is as effective as midazolam/fentanyl for procedural sedation and analgesia in the emergency department

Jamal SM, Fathil SM, Nidzwani MM, Ismail AK, Yatim FM

Med J Malaysia, 2011 Aug;66(3):231-3.
PMID: 22111446

The study compared the effectiveness of ketamine and midazolam/fentanyl as procedural sedation and analgesia agents for reduction of fractures and dislocated joints. Forty-one adult patients were enrolled by convenience sampling. They were randomized to receive ketamine or midazolam/fentanyl. Depth of sedation, pain score, procedural outcome and memory of the procedure were documented. The ketamine group had deeper sedation, but there was no statistical difference in other variables between the two groups. Three patients in the midazolam/fentanyl group had oxygen desaturation. More adverse effects were associated with ketamine. Intravenous ketamine is as effective as midazolam/fentanyl for procedural sedation.

Matched MeSH terms: Anesthetics, Intravenous/therapeutic use*

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