Remifentanil
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Chetan Lokhande, M.B.B.S [2]
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Overview
Remifentanil is an analgesic opioid that is FDA approved for the {{{indicationType}}} of general anesthesia; adjunct, monitored anesthesia care sedation, analgesic component; adjunct, postoperative pain, immediate postoperative period. Common adverse reactions include cardiovascular: hypotension (19% or less ), dermatologic: pruritus (less than 1% to 18% ), gastrointestinal: nausea (less than 1% to 44% ), vomiting (less than 1% to 22% ), musculoskeletal: muscle rigidity (11% or less) , neurologic: headache (18% or less ).
Adult Indications and Dosage
FDA-Labeled Indications and Dosage (Adult)
- Exceeding the recommended dose (greater than 1 and up to 20 mcg/kg) or exceeding the recommended infusion rate (starting dose greater than 0.1 mcg/kg/min) results in higher incidence of adverse events.
- Administering bolus doses to spontaneously breathing patients is not recommended.
- Analgesia for a mechanically ventilated patient, ICU: continuous infusion, 0.1 to 0.15 mcg/kg/min IV initially (using ideal body weight), with titration to a max dose of 0.2 to 0.4 mcg/kg/min IV (clinical studies).
- General anesthesia; adjunct: induction, 0.5 to 1 mcg/kg/min IV; 1 mcg/kg IV over 30 to 60 seconds if intubated within 8 minutes of initiation.
- General anesthesia; adjunct: maintenance, 0.25 mcg/kg/min IV (range 0.05 to 2 mcg/kg/min) plus isoflurane or propofol; supplemental bolus of 1 mcg/kg every 2 to 5 minutes if needed.
- General anesthesia; adjunct: maintenance, 0.4 mcg/kg/min IV (range 0.1 to 2 mcg/kg/min IV) plus nitrous oxide; supplemental bolus of 1 mcg/kg every 2 to 5 minutes if needed.
- General anesthesia; adjunct: CABG, during induction through intubation, 1 mcg/kg/min IV.
- General anesthesia; adjunct: CABG, during maintenance of anesthesia, 1 mcg/kg/min IV (range 0.125 to 4 mcg/kg/min); supplemental bolus of 0.5 to 1 mcg/kg if needed.
- Monitored anesthesia care sedation, Analgesic component; adjunct: single dose, used with midazolam, 0.5 mcg/kg IV injection over 30 to 60 seconds as single dose 90 seconds before administration of local anesthetic.
- Monitored anesthesia care sedation, Analgesic component; adjunct: single dose, used alone 1 mcg/kg IV injection over 30 to 60 seconds as single dose 90 seconds before administration of local anesthetic.
- Monitored anesthesia care sedation, Analgesic component; adjunct: continuous infusion, used WITH midazolam, 0.05 mcg/kg/min IV infusion 5 minutes before placement of local or regional block; after placement of block, decrease dose to 0.025 mcg/kg/min (range 0.025 to 0.2 mcg/kg/min), adjust dose in 0.025 mcg/kg/min increments at 5-minute intervals.
- Monitored anesthesia care sedation, Analgesic component; adjunct: continuous infusion, used alone, 0.1 mcg/kg/min IV infusion 5 minutes before placement of local or regional block; after placement of block, decrease dose to 0.05 mcg/kg/min (range 0.025 to 0.2 mcg/kg/min), adjust dose in 0.025 mcg/kg/min increments at 5-minute intervals.
- Postoperative pain, Immediate postoperative period: 0.1 mcg/kg/min IV, adjust infusion every 5 minutes in 0.025 mcg/kg/min increments to reach desired effect (range 0.025 to 0.2 mcg/kg/min) [1]
- Postoperative pain, Immediate postoperative period: CABG, 1 mcg/kg/min IV infusion (range 0.05 to 1 mcg/kg/min).
Off-Label Use and Dosage (Adult)
Guideline-Supported Use
- Analgesia for a mechanically ventilated patient, ICU.
- Procedural sedation.
Non–Guideline-Supported Use
There is limited information about Off-Label Non–Guideline-Supported Use of Remifentanil in adult patients.
Pediatric Indications and Dosage
FDA-Labeled Indications and Dosage (Pediatric)
- Efficacy for use in pediatric patients during the immediate postoperative period or for use as a component of monitored anesthesia care has not been established.
- Administering bolus doses to spontaneously breathing patients is not recommended.
- Analgesia for a mechanically ventilated patient, ICU: (infants) continuous infusion, 0.075 to 0.15 mcg/kg/min IV initially, with titration to a max dose of 0.5 to 0.94 mcg/kg/min IV (clinical studies).
- Analgesia for a mechanically ventilated patient, ICU: (children) continuous infusion, 0.1 mcg/kg/min IV (clinical study) [9]
- General anesthesia; Adjunct: (age birth to 2 months) maintenance, 0.4 mcg/kg/min IV (range 0.4 to 1 mcg/kg/min) plus nitrous oxide; supplemental bolus of 1 mcg/kg every 2 to 5 minutes if needed.
- General anesthesia; Adjunct: (age 1 year to 12 years) maintenance, 0.25 mcg/kg/min IV (range 0.05 to 1.3 mcg/kg/min) plus halothane, sevoflurane, or isoflurane; supplemental bolus of 1 mcg/kg every 2 to 5 minutes if needed.
Off-Label Use and Dosage (Pediatric)
Guideline-Supported Use
There is limited information about Off-Label Guideline-Supported Use of Remifentanil in pediatric patients.
Non–Guideline-Supported Use
There is limited information about Off-Label Non–Guideline-Supported Use of Remifentanil in pediatric patients.
Contraindications
Due to the presence of glycine in the formulation, ULTIVA is contraindicated for epidural or intrathecal administration. ULTIVA is also contraindicated in patients with known hypersensitivity to fentanyl analogs.
Warnings
Continuous infusions of ULTIVA should be administered only by an infusion device. IV bolus administration of ULTIVA should be used only during the maintenance of general anesthesia. In nonintubated patients, single doses of ULTIVA should be administered over 30 to 60 seconds.
Interruption of an infusion of ULTIVA will result in rapid offset of effect. Rapid clearance and lack of drug accumulation result in rapid dissipation of respiratory depressant and analgesic effects upon discontinuation of ULTIVA at recommended doses. Discontinuation of an infusion of ULTIVA should be preceded by the establishment of adequate postoperative analgesia.
Injections of ULTIVA should be made into IV tubing at or close to the venous cannula. Upon discontinuation of ULTIVA, the IV tubing should be cleared to prevent the inadvertent administration of ULTIVA at a later point in time. Failure to adequately clear the IV tubing to remove residual ULTIVA has been associated with the appearance of respiratory depression, apnea, and muscle rigidity upon the administration of additional fluids or medications through the same IV tubing.
USE OF ULTIVA IS ASSOCIATED WITH APNEA AND RESPIRATORY DEPRESSION. ULTIVA SHOULD BE ADMINISTERED ONLY BY PERSONS SPECIFICALLY TRAINED IN THE USE OF ANESTHETIC DRUGS AND THE MANAGEMENT OF THE RESPIRATORY EFFECTS OF POTENT OPIOIDS, INCLUDING RESPIRATORY AND CARDIAC RESUSCITATION OF PATIENTS IN THE AGE GROUP BEING TREATED. SUCH TRAINING MUST INCLUDE THE ESTABLISHMENT AND MAINTENANCE OF A PATENT AIRWAY AND ASSISTED VENTILATION.
ULTIVA SHOULD NOT BE USED IN DIAGNOSTIC OR THERAPEUTIC PROCEDURES OUTSIDE THE MONITORED ANESTHESIA CARE SETTING. PATIENTS RECEIVING MONITORED ANESTHESIA CARE SHOULD BE CONTINUOUSLY MONITORED BY PERSONS NOT INVOLVED IN THE CONDUCT OF THE SURGICAL OR DIAGNOSTIC PROCEDURE. OXYGEN SATURATION SHOULD BE MONITORED ON A CONTINUOUS BASIS.
RESUSCITATIVE AND INTUBATION EQUIPMENT, OXYGEN, AND AN OPIOID ANTAGONIST MUST BE READILY AVAILABLE.
Respiratory depression in spontaneously breathing patients is generally managed by decreasing the rate of the infusion of ULTIVA by 50% or by temporarily discontinuing the infusion.
Skeletal muscle rigidity can be caused by ULTIVA and is related to the dose and speed of administration. ULTIVA may cause chest wall rigidity (inability to ventilate) after single doses of >1 mcg/kg administered over 30 to 60 seconds, or after infusion rates >0.1 mcg/kg/min. Single doses <1 mcg/kg may cause chest wall rigidity when given concurrently with a continuous infusion of ULTIVA.
Muscle rigidity induced by ULTIVA should be managed in the context of the patient's clinical condition. Muscle rigidity occurring during the induction of anesthesia should be treated by the administration of a neuromuscular blocking agent and the concurrent induction medications.
Muscle rigidity seen during the use of ULTIVA in spontaneously breathing patients may be treated by stopping or decreasing the rate of administration of ULTIVA. Resolution of muscle rigidity after discontinuing the infusion of ULTIVA occurs within minutes. In the case of life-threatening muscle rigidity, a rapid onset neuromuscular blocker or naloxone may be administered.
ULTIVA should not be administered into the same IV tubing with blood due to potential inactivation by nonspecific esterases in blood products.
Adverse Reactions
Clinical Trials Experience
ULTIVA produces adverse events that are characteristic of µ-opioids, such as respiratory depression, bradycardia, hypotension, and skeletal muscle rigidity. These adverse events dissipate within minutes of discontinuing or decreasing the infusion rate of ULTIVA. See CLINICAL PHARMACOLOGY, WARNINGS, and PRECAUTIONS on the management of these events.
Adverse event information is derived from controlled clinical trials that were conducted in a variety of surgical procedures of varying duration, using a variety of premedications and other anesthetics, and in patient populations with diverse characteristics including underlying disease.
Adults
Approximately 2770 adult patients were exposed to ULTIVA in controlled clinical trials. The frequencies of adverse events during general anesthesia with the recommended doses of ULTIVA are given in Table 3. Each patient was counted once for each type of adverse event.
The frequencies of adverse events from the clinical studies at the recommended doses of ULTIVA in monitored anesthesia care are given in Table 5.
Other Adverse Events in Adult Patients
The frequencies of less commonly reported adverse clinical events from all controlled general anesthesia and monitored anesthesia care studies are presented below.
Event frequencies are calculated as the number of patients who were administered ULTIVA and reported an event divided by the total number of patients exposed to ULTIVA in all controlled studies including cardiac dose-ranging and neurosurgery studies (n = 1883 general anesthesia, n = 609 monitored anesthesia care).
Incidence Less than 1%
Digestive: constipation, abdominal discomfort, xerostomia, gastro-esophageal reflux, dysphagia, diarrhea, heartburn, ileus.
Cardiovascular: various atrial and ventricular arrhythmias, heart block, ECG change consistent with myocardial ischemia, elevated CPK-MB level, syncope.
Musculoskeletal: muscle stiffness, musculoskeletal chest pain.
Respiratory: cough, dyspnea, bronchospasm, laryngospasm, rhonchi, stridor, nasal congestion, pharyngitis, pleural effusion, hiccup(s), pulmonary edema, rales, bronchitis, rhinorrhea.
Nervous: anxiety, involuntary movement, prolonged emergence from anesthesia, confusion, awareness under anesthesia without pain, rapid awakening from anesthesia, tremors, disorientation, dysphoria, nightmare(s), hallucinations, paresthesia, nystagmus, twitch, sleep disorder, seizure, amnesia.
Body as a Whole: decreased body temperature, anaphylactic reaction, delayed recovery from neuromuscular block.
Skin: rash, urticaria.
Urogenital: urine retention, oliguria, dysuria, urine incontinence.
Infusion Site Reaction: erythema, pruritus, rash.
Metabolic and Nutrition: abnormal liver function, hyperglycemia, electrolyte disorders, increased CPK level.
Hematologic and Lymphatic: anemia, lymphopenia, leukocytosis, thrombocytopenia.
The frequencies of adverse events from the clinical studies at the recommended doses of ULTIVA in cardiac surgery are given in Tables 6, 7, and 8. These tables represent adverse events collected during discrete phases of cardiac surgery. Any event should be viewed as temporally associated with drug administration and the phase indicated should not be perceived as the only time the event might occur.
Pediatrics
ULTIVA has been studied in 342 pediatric patients in controlled clinical trials for maintenance of general anesthesia. In the pediatric population (birth to 12 years), the most commonly reported events were nausea, vomiting, and shivering.
The frequencies of adverse events during general anesthesia with the recommended doses of ULTIVA are given in Table 9. Each patient was counted once for each type of adverse event. There were no adverse events ≥1% for any treatment group during the maintenance period in the pediatric patient general anesthesia studies.
Observed During Clinical Practice
In addition to adverse events reported from clinical trials, the following events have been identified during post-approval use of remifentanil in conjunction with one or more anesthetic agents in clinical practice. Because they are reported voluntarily from a population of unknown size, estimates of frequency cannot be made. These events have been chosen for inclusion due to a combination of their seriousness, frequency of reporting, or potential causal connection to remifentanil.
Cardiovascular: Asystole.
Non-Site Specific: Anaphylactic/anaphylactoid responses, which in some cases have been severe (e.g., shock).
In the elderly population (>65 years), the incidence of hypotension is higher, whereas the incidence of nausea and vomiting is lower.
Postmarketing Experience
There is limited information regarding Remifentanil Postmarketing Experience in the drug label.
Drug Interactions
There is limited information regarding Remifentanil Drug Interactions in the drug label.
Use in Specific Populations
Pregnancy
Pregnancy Category (FDA):
There is no FDA guidance on usage of Remifentanil in women who are pregnant.
Pregnancy Category (AUS):
There is no Australian Drug Evaluation Committee (ADEC) guidance on usage of Remifentanil in women who are pregnant.
Labor and Delivery
There is no FDA guidance on use of Remifentanil during labor and delivery.
Nursing Mothers
There is no FDA guidance on the use of Remifentanil in women who are nursing.
Pediatric Use
There is no FDA guidance on the use of Remifentanil in pediatric settings.
Geriatic Use
There is no FDA guidance on the use of Remifentanil in geriatric settings.
Gender
There is no FDA guidance on the use of Remifentanil with respect to specific gender populations.
Race
There is no FDA guidance on the use of Remifentanil with respect to specific racial populations.
Renal Impairment
There is no FDA guidance on the use of Remifentanil in patients with renal impairment.
Hepatic Impairment
There is no FDA guidance on the use of Remifentanil in patients with hepatic impairment.
Females of Reproductive Potential and Males
There is no FDA guidance on the use of Remifentanil in women of reproductive potentials and males.
Immunocompromised Patients
There is no FDA guidance one the use of Remifentanil in patients who are immunocompromised.
Administration and Monitoring
Administration
There is limited information regarding Remifentanil Administration in the drug label.
Monitoring
There is limited information regarding Remifentanil Monitoring in the drug label.
IV Compatibility
There is limited information regarding the compatibility of Remifentanil and IV administrations.
Overdosage
There is limited information regarding Remifentanil overdosage. If you suspect drug poisoning or overdose, please contact the National Poison Help hotline (1-800-222-1222) immediately.
Pharmacology
There is limited information regarding Remifentanil Pharmacology in the drug label.
Mechanism of Action
ULTIVA is a µ-opioid agonist with rapid onset and peak effect, and short duration of action. The µ-opioid activity of ULTIVA is antagonized by opioid antagonists such as naloxone.
Unlike other opioids, ULTIVA is rapidly metabolized by hydrolysis of the propanoic acid-methyl ester linkage by nonspecific blood and tissue esterases. ULTIVA is not a substrate for plasma cholinesterase (pseudocholinesterase) and, therefore, patients with atypical cholinesterase are expected to have a normal duration of action.
Structure
ULTIVA (remifentanil hydrochloride) for Injection is a µ-opioid agonist chemically designated as a 3-[4-methoxycarbonyl-4-[(1-oxopropyl)phenylamino]-1-piperidine]propanoic acid methyl ester, hydrochloride salt, C20H28N2O5•HCl, with a molecular weight of 412.91. It has the following chemical structure:
ULTIVA is a sterile, nonpyrogenic, preservative-free, white to off-white lyophilized powder for intravenous (IV) administration after reconstitution and dilution. Each vial contains 1, 2, or 5 mg of remifentanil base; 15 mg glycine; and hydrochloric acid to buffer the solutions to a nominal pH of 3 after reconstitution. When reconstituted as directed, solutions of ULTIVA are clear and colorless and contain remifentanil hydrochloride (HCl) equivalent to 1 mg/mL of remifentanil base. The pH of reconstituted solutions of ULTIVA ranges from 2.5 to 3.5. Remifentanil HCl has a pKa of 7.07. Remifentanil HCl has an n-octanol:water partition coefficient of 17.9 at pH 7.3.
Pharmacodynamics
The analgesic effects of ULTIVA are rapid in onset and offset. Its effects and side effects are dose dependent and similar to other µ-opioids. ULTIVA in humans has a rapid blood-brain equilibration half-time of 1 ± 1 minutes (mean ± SD) and a rapid onset of action. The pharmacodynamic effects of ULTIVA closely follow the measured blood concentrations, allowing direct correlation between dose, blood levels, and response. Blood concentration decreases 50% in 3 to 6 minutes after a 1-minute infusion or after prolonged continuous infusion due to rapid distribution and elimination processes and is independent of duration of drug administration. Recovery from the effects of ULTIVA occurs rapidly (within 5 to 10 minutes). New steady-state concentrations occur within 5 to 10 minutes after changes in infusion rate. When used as a component of an anesthetic technique, ULTIVA can be rapidly titrated to the desired depth of anesthesia/analgesia (e.g., as required by varying levels of intraoperative stress) by changing the continuous infusion rate or by administering an IV bolus injection.
Hemodynamics
In premedicated patients undergoing anesthesia, 1-minute infusions of <2 mcg/kg of ULTIVA cause dose-dependent hypotension and bradycardia. While additional doses >2 mcg/kg (up to 30 mcg/kg) do not produce any further decreases in heart rate or blood pressure, the duration of the hemodynamic change is increased in proportion to the blood concentrations achieved. Peak hemodynamic effects occur within 3 to 5 minutes of a single dose of ULTIVA or an infusion rate increase. Glycopyrrolate, atropine, and vagolytic neuromuscular blocking agents attenuate the hemodynamic effects associated with ULTIVA. When appropriate, bradycardia and hypotension can be reversed by reduction of the rate of infusion of ULTIVA, or the dose of concurrent anesthetics, or by the administration of fluids or vasopressors.
Respiration
ULTIVA depresses respiration in a dose-related fashion. Unlike other fentanyl analogs, the duration of action of ULTIVA at a given dose does not increase with increasing duration of administration, due to lack of drug accumulation. When ULTIVA and alfentanil were dosed to equal levels of respiratory depression, recovery of respiratory drive after 3-hour infusions was more rapid and less variable with ULTIVA (see Figure 1).
pontaneous respiration occurs at blood concentrations of 4 to 5 ng/mL in the absence of other anesthetic agents; for example, after discontinuation of a 0.25-mcg/kg/min infusion of remifentanil, these blood concentrations would be reached in 2 to 4 minutes. In patients undergoing general anesthesia, the rate of respiratory recovery depends upon the concurrent anesthetic; N2O < propofol < isoflurane (see CLINICAL TRIALS: Recovery).
Muscle Rigidity
Skeletal muscle rigidity can be caused by ULTIVA and is related to the dose and speed of administration. ULTIVA may cause chest wall rigidity (inability to ventilate) after single doses of >1 mcg/kg administered over 30 to 60 seconds or infusion rates >0.1 mcg/kg/min; peripheral muscle rigidity may occur at lower doses. Administration of doses <1 mcg/kg may cause chest wall rigidity when given concurrently with a continuous infusion of ULTIVA. Prior or concurrent administration of a hypnotic (propofol or thiopental) or a neuromuscular blocking agent may attenuate the development of muscle rigidity. Excessive muscle rigidity can be treated by decreasing the rate or discontinuing the infusion of ULTIVA or by administering a neuromuscular blocking agent.
Histamine Release
Assays of histamine in patients and normal volunteers have shown no elevation in plasma histamine levels after administration of ULTIVA in doses up to 30 mcg/kg over 60 seconds.
Analgesia
Infusions of 0.05 to 0.1 mcg/kg/min, producing blood concentrations of 1 to 3 ng/mL, are typically associated with analgesia with minimal decrease in respiratory rate. Supplemental doses of 0.5 to 1 mcg/kg, incremental increases in infusion rate >0.05 mcg/kg/min, and blood concentrations exceeding 5 ng/mL (typically produced by infusions of 0.2 mcg/kg/min) have been associated with transient and reversible respiratory depression, apnea, and muscle rigidity.
Anesthesia
ULTIVA is synergistic with the activity of hypnotics (propofol and thiopental), inhaled anesthetics, and benzodiazepines (see CLINICAL TRIALS, PRECAUTIONS, and DOSAGE AND ADMINISTRATION).
Age
The pharmacodynamic activity of ULTIVA (as measured by the EC50 for development of delta waves on the EEG) increases with increasing age. The EC50 of remifentanil for this measure was 50% less in patients over 65 years of age when compared to healthy volunteers (25 years of age) (see DOSAGE AND ADMINISTRATION).
Gender
No differences have been shown in the pharmacodynamic activity (as measured by the EEG) of ULTIVA between men and women.
Drug Interactions
In animals the duration of muscle paralysis from succinylcholine is not prolonged by remifentanil.
Intraocular Pressure
There was no change in intraocular pressure after the administration of ULTIVA prior to ophthalmic surgery under monitored anesthesia care.
Cerebrodynamics
Under isoflurane-nitrous oxide anesthesia (PaCO2 <30 mmHg), a 1-minute infusion of ULTIVA (0.5 or 1.0 mcg/kg) produced no change in intracranial pressure. Mean arterial pressure and cerebral perfusion decreased as expected with opioids. In patients receiving ULTIVA and nitrous oxide anesthesia, cerebrovascular reactivity to carbon dioxide remained intact. In humans, no epileptiform activity was seen on the EEG (n = 44) at remifentanil doses up to 8 mcg/kg/min.
Renal Dysfunction
The pharmacodynamics of ULTIVA (ventilatory response to hypercarbia) are unaltered in patients with end stage renal disease (creatinine clearance <10 mL/min).
Hepatic Dysfunction
The pharmacodynamics of ULTIVA (ventilatory response to hypercarbia) are unaltered in patients with severe hepatic dysfunction awaiting liver transplant.
Pharmacokinetics
After IV doses administered over 60 seconds, the pharmacokinetics of remifentanil fit a three-compartment model with a rapid distribution half-life of 1 minute, a slower distribution half-life of 6 minutes, and a terminal elimination half-life of 10 to 20 minutes. Since the terminal elimination component contributes less than 10% of the overall area under the concentration versus time curve (AUC), the effective biological half-life of ULTIVA is 3 to 10 minutes. This is similar to the 3- to 10-minute half-life measured after termination of prolonged infusions (up to 4 hours; see Figure 2) and correlates with recovery times observed in the clinical setting after infusions up to 12 hours. Concentrations of remifentanil are proportional to the dose administered throughout the recommended dose range. The pharmacokinetics of remifentanil are unaffected by the presence of renal or hepatic impairment.
Distribution
The initial volume of distribution (Vd) of remifentanil is approximately 100 mL/kg and represents distribution throughout the blood and rapidly perfused tissues. Remifentanil subsequently distributes into peripheral tissues with a steady-state volume of distribution of approximately 350 mL/kg. These two distribution volumes generally correlate with total body weight (except in severely obese patients when they correlate better with ideal body weight [IBW]). Remifentanil is approximately 70% bound to plasma proteins of which two-thirds is binding to alpha-1-acid-glycoprotein.
Metabolism
Remifentanil is an esterase-metabolized opioid. A labile ester linkage renders this compound susceptible to hydrolysis by nonspecific esterases in blood and tissues. This hydrolysis results in the production of the carboxylic acid metabolite (3-[4-methoxycarbonyl-4-[(1-oxopropyl)phenylamino]-1-piperidine]propanoic acid), and represents the principal metabolic pathway for remifentanil (>95%). The carboxylic acid metabolite is essentially inactive (1/4600 as potent as remifentanil in dogs) and is excreted by the kidneys with an elimination half-life of approximately 90 minutes. Remifentanil is not metabolized by plasma cholinesterase (pseudocholinesterase) and is not appreciably metabolized by the liver or lung.
Elimination
The clearance of remifentanil in young, healthy adults is approximately 40 mL/min/kg. Clearance generally correlates with total body weight (except in severely obese patients when it correlates better with IBW). The high clearance of remifentanil combined with a relatively small volume of distribution produces a short elimination half-life of approximately 3 to 10 minutes (see Figure 2). This value is consistent with the time taken for blood or effect site concentrations to fall by 50% (context-sensitive half-times) which is approximately 3 to 6 minutes. Unlike other fentanyl analogs, the duration of action does not increase with prolonged administration.
Titration to Effect
The rapid elimination of remifentanil permits the titration of infusion rate without concern for prolonged duration. In general, every 0.1-mcg/kg/min change in the IV infusion rate will lead to a corresponding 2.5-ng/mL change in blood remifentanil concentration within 5 to 10 minutes. In intubated patients only, a more rapid increase (within 3 to 5 minutes) to a new steady state can be achieved with a 1.0-mcg/kg bolus dose in conjunction with an infusion rate increase.
Special Populations
Pediatrics
In pediatric patients, 5 days to 17 years of age (n = 47), the clearance and volume of distribution of remifentanil were increased in younger children and declined to young healthy adult values by age 17. The average clearance of remifentanil in neonates (less than 2 months of age) was approximately 90.5 ± 36.8 mL/min/kg (mean ± SD) while in adolescents (13 to 16 years) this value was 57.2 ± 21.1 mL/min/kg. The total (steady-state) volume of distribution in neonates was 452 ± 144 mL/kg versus 223 ± 30.6 mL/kg in adolescents. The half-life of remifentanil was the same in neonates and adolescents. Clearance of remifentanil was maintained at or above normal adult values in patients 5 days to 17 years of age.
Renal Impairment
The pharmacokinetic profile of ULTIVA is not changed in patients with end stage renal disease (creatinine clearance <10 mL/min). In anephric patients, the half-life of the carboxylic acid metabolite increases from 90 minutes to 30 hours. The metabolite is removed by hemodialysis with a dialysis extraction ratio of approximately 30%.
Hepatic Impairment
The pharmacokinetics of remifentanil and its carboxylic acid metabolite are unchanged in patients with severe hepatic impairment.
Elderly
The clearance of remifentanil is reduced (approximately 25%) in the elderly (>65 years of age) compared to young adults (average 25 years of age). However, remifentanil blood concentrations fall as rapidly after termination of administration in the elderly as in young adults.
Gender
There is no significant difference in the pharmacokinetics of remifentanil in male and female patients after correcting for differences in weight.
Obesity
There is no difference in the pharmacokinetics of remifentanil in non-obese versus obese (greater than 30% over IBW) patients when normalized to IBW.
Cardiopulmonary Bypass (CPB)
Remifentanil clearance is reduced by approximately 20% during hypothermic CPB.
Drug Interactions
Remifentanil clearance is not altered by concomitant administration of thiopental, isoflurane, propofol, or temazepam during anesthesia. In vitro studies with atracurium, mivacurium, esmolol, echothiophate, neostigmine, physostigmine, and midazolam revealed no inhibition of remifentanil hydrolysis in whole human blood by these drugs.
Nonclinical Toxicology
There is limited information regarding Remifentanil Nonclinical Toxicology in the drug label.
Clinical Studies
ULTIVA was evaluated in 3341 patients undergoing general anesthesia (n = 2706) and monitored anesthesia care (n = 639). These patients were evaluated in the following settings: inpatient (n = 2079) which included cardiovascular (n = 426), and neurosurgical (n = 61), and outpatient (n = 1349). Four-hundred and eighty-six (486) elderly patients (age range 66 to 90 years) and 410 pediatric patients (age range birth to 12 years) received ULTIVA. Of the general anesthesia patients, 682 also received ULTIVA as an IV analgesic agent during the immediate postoperative period.
Induction and Maintenance of General Anesthesia—Inpatient/Outpatient
The efficacy of ULTIVA was investigated in 1562 patients in 15 randomized, controlled trials as the analgesic component for the induction and maintenance of general anesthesia. Eight of these studies compared ULTIVA to alfentanil and two studies compared ULTIVA to fentanyl. In these studies, doses of ULTIVA up to the ED90 were compared to recommended doses (approximately ED50) of alfentanil or fentanyl.
Induction of Anesthesia
ULTIVA was administered with isoflurane, propofol, or thiopental for the induction of anesthesia (n = 1562). The majority of patients (80%) received propofol as the concurrent agent. ULTIVA reduced the propofol and thiopental requirements for loss of consciousness. Compared to alfentanil and fentanyl, a higher relative dose of ULTIVA resulted in fewer responses to intubation (see Table 1). Overall, hypotension occurred in 5% of patients receiving ULTIVA compared to 2% of patients receiving the other opioids.
ULTIVA has been used as a primary agent for the induction of anesthesia; however, it should not be used as a sole agent because loss of consciousness cannot be assured and because of a high incidence of apnea, muscle rigidity, and tachycardia. The administration of an induction dose of propofol or thiopental or a paralyzing dose of a muscle relaxant prior to or concurrently with ULTIVA during the induction of anesthesia markedly decreased the incidence of muscle rigidity from 20% to <1%.
Use During Maintenance of Anesthesia
ULTIVA was investigated in 929 patients in seven well-controlled general surgery studies in conjunction with nitrous oxide, isoflurane, or propofol in both inpatient and outpatient settings. These studies demonstrated that ULTIVA could be dosed to high levels of opioid effect and rapidly titrated to optimize analgesia intraoperatively without delaying or prolonging recovery.
Compared to alfentanil and fentanyl, these higher relative doses (ED90) of ULTIVA resulted in fewer responses to intraoperative stimuli (see Table 2) and a higher frequency of hypotension (16% compared to 5% for the other opioids). ULTIVA was infused to the end of surgery, while alfentanil was discontinued 5 to 30 minutes before the end of surgery as recommended. The mean final infusion rates of ULTIVA were between 0.25 and 0.48 mcg/kg/min.
In three randomized, controlled studies (n = 407) during general anesthesia, ULTIVA attenuated the signs of light anesthesia within a median time of 3 to 6 minutes after bolus doses of 1 mcg/kg with or without infusion rate increases of 50% to 100% (up to a maximum rate of 2 mcg/kg/min).
In an additional double-blind, randomized study (n = 103), a constant rate (0.25 mcg/kg/min) of ULTIVA was compared to doubling the rate to 0.5 mcg/kg/min approximately 5 minutes before the start of the major surgical stress event. Doubling the rate decreased the incidence of signs of light anesthesia from 67% to 8% in patients undergoing abdominal hysterectomy, and from 19% to 10% in patients undergoing radical prostatectomy. In patients undergoing laminectomy the lower dose was adequate.
Recovery
In 2169 patients receiving ULTIVA for periods up to 16 hours, recovery from anesthesia was rapid, predictable, and independent of the duration of the infusion of ULTIVA. In the seven controlled, general surgery studies, extubation occurred in a median of 5 minutes (range: -3 to 17 minutes in 95% of patients) in outpatient anesthesia and 10 minutes (range: 0 to 32 minutes in 95% of patients) in inpatient anesthesia. Recovery in studies using nitrous oxide or propofol was faster than in those using isoflurane as the concurrent anesthetic. There was no case of remifentanil-induced delayed respiratory depression occurring more than 30 minutes after discontinuation of remifentanil (see PRECAUTIONS).
In a double-blind, randomized study, administration of morphine sulfate (0.15 mg/kg) intravenously 20 minutes before the anticipated end of surgery to 98 patients did not delay recovery of respiratory drive in patients undergoing major surgery with remifentanil-propofol total IV anesthesia.
Spontaneous Ventilation Anesthesia
Two randomized, dose-ranging studies (n = 127) examined the administration of ULTIVA to outpatients undergoing general anesthesia with a laryngeal mask. Starting infusion rates of ULTIVA of ≤0.05 mcg/kg/min provided supplemental analgesia while allowing spontaneous ventilation with propofol or isoflurane. Bolus doses of ULTIVA during spontaneous ventilation lead to transient periods of apnea, respiratory depression, and muscle rigidity.
Pediatric Anesthesia
ULTIVA has been evaluated for maintenance of general anesthesia in 410 pediatric patients from birth to 12 years undergoing inpatient and outpatient procedures. Four clinical trials have been performed.
Study 1, an open-label, randomized, controlled clinical trial (n = 129), compared ULTIVA (n = 68) with alfentanil (n = 19), isoflurane (n = 22), or propofol (n = 20) in children 2 to 12 years of age undergoing strabismus surgery. After induction of anesthesia which included the administration of atropine, ULTIVA was administered as an initial infusion of 1 mcg/kg/min with 70% nitrous oxide. The infusion rate required during maintenance of anesthesia was 0.73 to 1.95 mcg/kg/min. Time to extubation and to purposeful movement was a median of 10 minutes (range 1 to 24 minutes).
Study 2, a double-blind, randomized, controlled trial (n = 222), compared ULTIVA (n = 119) to fentanyl (n = 103) in children 2 to 12 years of age undergoing tonsillectomy with or without adenoidectomy. After induction of anesthesia, patients received a 0.25 mcg/kg/min infusion of ULTIVA or fentanyl by IV bolus with nitrous oxide/oxygen (2:1) and either halothane or sevoflurane for maintenance of anesthesia. The mean infusion rate required during maintenance of anesthesia was 0.3 mcg/kg/min (range 0.2 to 1.3 mcg/kg/min). The continuous infusion rate was decreased to 0.05 mcg/kg/min approximately 10 minutes prior to the end of surgery. Time to spontaneous purposeful movement was a median of 8 minutes (range 1 to 19 minutes). Time to extubation was a median of 9 minutes (range 2 to 19 minutes).
Study 3, an open-label, randomized, controlled trial (n = 271), compared ULTIVA (n = 185) with a regional anesthetic technique (n = 86) in children 1 to 12 years of age undergoing major abdominal, urological, or orthopedic surgery. Patients received a 0.25 mcg/kg/min infusion of ULTIVA following a 1.0 mcg/kg bolus or bupivacaine by epidural infusion, along with isoflurane and nitrous oxide after the induction of anesthesia. The mean infusion rate required during maintenance of anesthesia was 0.25 mcg/kg/min (range 0 to 0.75 mcg/kg/min). Both treatments were effective in attenuating responses to skin incision during surgery. The hemodynamic profile of the ULTIVA group was consistent with an opioid-based general anesthetic technique. Time to spontaneous purposeful movement was a median of 15 minutes (range, 2 to 75 minutes) in the remifentanil group. Time to extubation was a median of 13 minutes (range, 4 to 31 minutes) in the remifentanil group.
Study 4, an open-label, randomized, controlled trial (n=60), compared ULTIVA (n = 38) with halothane (n = 22) in ASA 1 or 2, full term neonates and infants ≤ 8 weeks of age weighing at least 2500 grams who were undergoing pyloromyotomy. After induction of anesthesia, which included the administration of atropine, patients received 0.4 mcg/kg/min of ULTIVA or 0.4% halothane with 70% nitrous oxide for initial maintenance of anesthesia and then both agents were adjusted according to clinical response. Bolus doses of 1 mcg/kg administered over 30 to 60 seconds were used to treat brief episodes of hypertension and tachycardia, and infusion rates were increased by 50% to treat sustained hypertension and tachycardia. The range of infusion rates of ULTIVA required during maintenance of anesthesia was 0.4 to 1 mcg/kg/min. [Seventy-one percent (71%) of Ultiva patients required supplementary boluses or rate increases from the starting dose of 0.4 mcg/kg/min to treat hypertension, tachycardia, movement or somatic signs of light anesthesia. Twenty-four percent of the patients required an increase from the initial rate of 0.4 mcg/kg/min prior to incision and 26% of patients required an infusion rate between 0.8 and 1.0 mcg/kg/min, most often during gastric manipulation. The continuous infusion rate was decreased to 0.05 mcg/kg/min approximately 10 minutes before the end of surgery. In the ULTIVA group, median time from discontinuation of anesthesia to spontaneous purposeful movement was 6.5 minutes (range, 1 to 13 minutes) and median time to extubation was 8.5 minutes (range, 1 to 14 minutes). The initial maintenance infusion regimen of Ultiva evaluated in pediatric patients from birth to 2 months of age was 0.4 mcg/kg/min, the approved adult regimen for use with N2O. The clearance rate observed in the neonatal population was highly variable and on average was two times higher than in the young healthy adult population. Therefore, while a starting infusion of 0.4 mcg/kg/min may be appropriate for some neonates, an increased infusion rate may be necessary to maintain adequate surgical anesthesia, and additional bolus doses may be required. The individual dose for each patient should be carefully titrated. (see Clinical Pharmacology: Special Populations: Pediatric Patients, and DOSAGE AND ADMINISTRATION, Table 11).
No pediatric patients receiving ULTIVA required naloxone during the immediate postoperative recovery period.
Coronary Artery Bypass Surgery
ULTIVA was originally administered to 225 subjects undergoing elective CABG surgery in two dose-ranging studies without active comparators. Subsequently, two double-blind, double-dummy clinical studies (N = 426) evaluated ULTIVA (n = 236) at recommended doses versus active comparators (n = 190).
The first comparator study, a multi-center, randomized, double-blind, double-dummy, parallel-group study (N = 369), compared ULTIVA (n = 201) with fentanyl (n = 168) in adult patients undergoing elective CABG surgery. Subjects received 1 to 3-mg midazolam and 0.05-mg/kg morphine IV as premedication. Anesthesia was induced with propofol 0.5 mg/kg (higher doses administered with ULTIVA were associated with excessive hypotension) over one minute plus 10-mg boluses every 10 seconds until loss of consciousness followed by either cisatracurium 0.2 mg/kg or vecuronium 0.15 mg/kg. Patients randomized to ULTIVA received a 1 mcg/kg/min infusion of ULTIVA followed by a placebo bolus administered over 3 minutes. In the active control group, a placebo IV infusion was started and a fentanyl bolus 10 mcg/kg was administered over 3 minutes. All subjects received isoflurane titrated initially to end tidal concentration of 0.5%. During maintenance, the group randomized to ULTIVA received as needed 0.5-1 mcg/kg/min IV rate increases (to a maximum of 4 mcg/kg/min) of ULTIVA and 1 mcg/kg IV boluses of ULTIVA. The active control group received 2 mcg/kg IV boluses of fentanyl and increases in placebo IV infusion rate.
The second comparator study, a multi-center, double-blind, randomized, parallel group study (N = 57), compared ULTIVA (n = 35) to fentanyl (n = 22) in adult patients undergoing elective CABG surgery with poor left ventricular function (ejection fraction <0.35). Subjects received oral lorazepam 40 mcg/kg as premedication. Anesthesia was induced using etomidate until loss of consciousness, followed by a low-dose propofol infusion (3 mg/kg/hr) and pancuronium 0.15 mg/kg. Subjects in the group administered ULTIVA received a placebo bolus dose and a continuous infusion of ULTIVA 1 mcg/kg/min and subjects in the fentanyl group received a bolus loading dose of 15 mcg/kg and placebo continuous infusion. During maintenance, supplemental bolus doses of ULTIVA (0.5 mcg/kg) and infusion rate increases of 0.5 to 1 mcg/kg/min (maximum rate allowed was 4 mcg/kg/min) of ULTIVA were administered to one group; while the fentanyl group was given intermittent maintenance bolus doses of 2 mcg/kg and increases in the placebo infusion rate.
In these two studies, using a high dose opioid technique with ULTIVA as a component of a balanced or total intravenous anesthetic regimen, the remifentanil regimen effectively attenuated response to maximal sternal spread generally better than the dose and regimen studied for the active control (fentanyl). While this provides evidence for the efficacy of remifentanil as an analgesic in this setting, caution must be exercised in interpreting these results as evidence of superiority of remifentanil over the active control, since these studies did not make any attempt to evaluate and compare the optimal analgesic doses of either drug in this setting.
Neurosurgery
ULTIVA was administered to 61 patients undergoing craniotomy for removal of a supratentorial mass lesion. In these studies, ventilation was controlled to maintain a predicted PaCO2 of approximately 28 mmHg. In one study (n = 30) with ULTIVA and 66% nitrous oxide, the median time to extubation and to patient response to verbal commands was 5 minutes (range -1 to 19 minutes). Intracranial pressure and cerebrovascular responsiveness to carbon dioxide were normal (see CLINICAL PHARMACOLOGY).
A randomized, controlled study compared ULTIVA (n = 31) to fentanyl (n = 32). ULTIVA (1 mcg/kg/min) and fentanyl (2 mcg/kg/min) were administered after induction with thiopental and pancuronium. A similar number of patients (6%) receiving ULTIVA and fentanyl had hypotension during induction. Anesthesia was maintained with nitrous oxide and ULTIVA at a mean infusion rate of 0.23 mcg/kg/min (range 0.1 to 0.4) compared with a fentanyl mean infusion rate of 0.04 mcg/kg/min (range 0.02 to 0.07). Supplemental isoflurane was administered as needed. The patients receiving ULTIVA required a lower mean isoflurane dose (0.07 MAC-hours) compared with 0.64 MAC-hours for the fentanyl patients (P = 0.04). ULTIVA was discontinued at the end of anesthesia, whereas fentanyl was discontinued at the time of bone flap replacement (a median time of 44 minutes before the end of surgery). Median time to extubation was similar (5 and 3.5 minutes, respectively, with ULTIVA and fentanyl). None of the patients receiving ULTIVA required naloxone compared to seven of the fentanyl patients (P = 0.01). Eighty-one percent (81%) of patients receiving ULTIVA recovered (awake, alert, and oriented) within 30 minutes after surgery compared with 59% of fentanyl patients (P = 0.06). At 45 minutes, recovery rates were similar (81% and 69% respectively for ULTIVA and fentanyl, P = 0.27). Patients receiving ULTIVA required an analgesic for headache sooner than fentanyl patients (median of 35 minutes compared with 136 minutes, respectively [P = 0.04]). No adverse cerebrovascular effects were seen in this study (see CLINICAL PHARMACOLOGY).
Continuation of Analgesic Use into the Immediate Postoperative Period
Analgesia with ULTIVA in the immediate postoperative period (until approximately 30 minutes after extubation) was studied in 401 patients in four dose-finding studies and in 281 patients in two efficacy studies. In the dose-finding studies, the use of bolus doses of ULTIVA and incremental infusion rate increases ≥0.05 mcg/kg/min led to respiratory depression and muscle rigidity. Bolus doses of ULTIVA to treat postoperative pain are not recommended and incremental infusion rate increases should not exceed 0.025 mcg/kg/min at 5-minute intervals.
In two efficacy studies, ULTIVA 0.1 mcg/kg/min was started immediately after discontinuing anesthesia. Incremental infusion rate increases of 0.025 mcg/kg/min every 5 minutes were given to treat moderate to severe postoperative pain. In Study 1, 50% decreases in infusion rate were made if respiratory rate decreased below 12 breaths/min and in Study 2, the same decreases were made if respiratory rate was below 8 breaths/min. With this difference in criteria for infusion rate decrease, the incidence of respiratory depression was lower in Study 1 (4%) than in Study 2 (12%). In both studies, ULTIVA provided effective analgesia (no or mild pain with respiratory rate ≥8 breaths/min) in approximately 60% of patients at mean final infusion rates of 0.1 to 0.125 mcg/kg/min.
Study 2 was a double-blind, randomized, controlled study in which patients received either morphine sulfate (0.15 mg/kg administered 20 minutes before the anticipated end of surgery plus 2-mg bolus doses for supplemental analgesia) or ULTIVA (as described above). Emergence from anesthesia was similar between groups; median time to extubation was 5 to 6 minutes for both. ULTIVA provided effective analgesia in 58% of patients compared to 33% of patients who received morphine. Respiratory depression occurred in 12% of patients receiving ULTIVA compared to 4% of morphine patients. For patients who received ULTIVA, morphine sulfate (0.15 mg/kg) was administered in divided doses 5 and 10 minutes before discontinuing ULTIVA. Within 30 minutes after discontinuation of ULTIVA, the percentage of patients with effective analgesia decreased to 34%.
Monitored Anesthesia Care
ULTIVA has been studied in the monitored anesthesia care setting in 609 patients in eight clinical trials. Nearly all patients received supplemental oxygen in these studies. Two early dose-finding studies demonstrated that use of sedation as an endpoint for titration of ULTIVA led to a high incidence of muscle rigidity (69%) and respiratory depression. Subsequent trials titrated ULTIVA to specific clinical endpoints of patient comfort, analgesia, and adequate respiration (respiratory rate >8 breaths/min) with a corresponding lower incidence of muscle rigidity (3%) and respiratory depression. With doses of midazolam >2 mg (4 to 8 mg), the dose of ULTIVA could be decreased by 50%, but the incidence of respiratory depression rose to 32%.
The efficacy of a single dose of ULTIVA (1.0 mcg/kg over 30 seconds) was compared to alfentanil (7 mcg/kg over 30 seconds) in patients undergoing ophthalmic surgery. More patients receiving ULTIVA were pain free at the time of the nerve block (77% versus 44%, P = 0.02) and more experienced nausea (12% versus 4%) than those receiving alfentanil.
In a randomized, controlled study (n = 118), ULTIVA 0.5 mcg/kg over 30 to 60 seconds followed by a continuous infusion of 0.1 mcg/kg/min, was compared to a propofol bolus (500 mcg/kg) followed by a continuous infusion (50 mcg/kg/min) in patients who received a local or regional anesthetic nerve block 5 minutes later. The incidence of moderate or severe pain during placement of the block was similar between groups (2% with ULTIVA and 8% with propofol, P = 0.2) and more patients receiving ULTIVA experienced nausea (26% versus 2%, P < 0.001). The final mean infusion rate of ULTIVA was 0.08 mcg/kg/min.
In a randomized, double-blind study, ULTIVA with or without midazolam was evaluated in 159 patients undergoing superficial surgical procedures under local anesthesia. ULTIVA was administered without midazolam as a 1-mcg/kg dose over 30 seconds followed by a continuous infusion of 0.1 mcg/kg/min. In the group of patients that received midazolam, ULTIVA was administered as a 0.5-mcg/kg dose over 30 seconds followed by a continuous infusion of 0.05 mcg/kg/min and midazolam 2 mg was administered 5 minutes later. The occurrence of moderate or severe pain during the local anesthetic injection was similar between groups (16% and 20%). Other effects for ULTIVA alone and ULTIVA/midazolam were: respiratory depression with oxygen desaturation (SPO2<90%), 5% and 2%; nausea, 8% and 2%; and pruritus, 23% and 12%. Titration of ULTIVA resulted in prompt resolution of respiratory depression (median 3 minutes, range 0 to 6 minutes). The final mean infusion rate of ULTIVA was 0.12 mcg/kg/min (range 0.03 to 0.3) for the group receiving ULTIVA alone and 0.07 mcg/kg/min (range 0.02 to 0.2) for the group receiving ULTIVA/midazolam.
Because of the risk for hypoventilation, the infusion rate of ULTIVA should be decreased to 0.05 mcg/kg/min following placement of the local or regional block and titrated thereafter in increments of 0.025 mcg/kg/min at 5-minute intervals. Bolus doses of ULTIVA administered simultaneously with a continuous infusion of ULTIVA to spontaneously breathing patients are not recommended.
How Supplied
ULTIVA should be stored at 2° to 25°C (36° to 77°F). ULTIVA for IV use is supplied as follows:
LTIVA® is a registered trademark of Glaxo Group Limited. DIPRIVAN® is a registered trademark of Zeneca Pharmaceuticals. US Patent Nos. 5,019,583; and 5,866,591
Manufactured for: Mylan Institutional LLC Rockford, IL 61103 U.S.A.
Manufactured by: Hospira, Inc. Lake Forest, IL 60045
Made in U.S.A.
JULY 2011 MI:ULTIIJ:R1
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