The ED95 (dose required to produce 95% suppression of the first [T1] mechanomyographic [MMG] response of the adductor pollicis muscle [thumb] to indirect supramaximal train-of-four stimulation of the ulnar nerve) during opioid/nitrous oxide/oxygen anesthesia is approximately 0.3 mg/kg. Patient variability around the ED95 dose suggests that 50% of patients will exhibit T1 depression of 91% to 97%.
Table 4 presents intubating conditions in patients with intubation initiated at 60 to 70 seconds.
TABLE 4: Percent of Excellent or Good Intubating Conditions and Median (Range) Time to Completion of Intubation in Patients with Intubation Initiated at 60 to 70 Seconds
Rocuronium Bromide Dose (mg/kg) Administered over 5 sec
| Percent of Patients with Excellent or Good Intubating Conditions
| Time to Completion of Intubation (min)
|
Adults* 18 to 64 yrs 0.45 (n=43) 0.6 (n=51)
| 86% 96%
| 1.6 (1 to 7) 1.6 (1 to 3.2)
|
Infants † 3 mo to 1 yr 0.6 (n=18)
| 100%
| 1 (1 to 1.5)
|
Pediatric† 1 to 12 yrs 0.6 (n=12)
| 100%
| 1 (0.5 to 2.3)
|
* Excludes patients undergoing Cesarean section.
† Pediatric patients were under halothane anesthesia.
Excellent intubating conditions = jaw relaxed, vocal cords apart and immobile, no diaphragmatic movement.
Good intubating conditions = same as excellent but with some diaphragmatic movement.
Table 5 presents the time to onset and clinical duration for the initial dose of Rocuronium Bromide Injection under opioid/nitrous oxide/oxygen anesthesia in adults and geriatric patients, and under halothane anesthesia in pediatric patients.
TABLE 5: Median (Range) Time to Onset and Clinical Duration Following Initial (Intubating) Dose During Opioid/Nitrous Oxide/Oxygen Anesthesia (Adults) and Halothane Anesthesia (Pediatric Patients)
Rocuronium Bromide Dose (mg/kg)
Administered
over 5 sec
| Time to ≥80% Block
(min)
| Time to Maximum Block
(min)
| Clinical Duration
(min)
|
Adults 18 to 64 yrs 0.45 (n=50)
0.6 (n=142)
0.9 (n=20)
1.2 (n=18)
| 1.3 (0.8 to 6.2) 1 (0.4 to 6)
1.1 (0.3 to 3.8)
0.7 (0.4 to 1.7)
| 3 (1.3 to 8.2) 1.8 (0.6 to 13)
1.4 (0.8 to 6.2)
1 (0.6 to 4.7)
| 22 (12 to 31) 31 (15 to 85)
58 (27 to 111)
67 (38 to 160)
|
Geriatric ≥65 yrs 0.6 (n=31)
0.9 (n=5)
1.2 (n=7)
| 2.3 (1 to 8.3) 2 (1 to 3)
1 (0.8 to 3.5)
| 3.7 (1.3 to 11.3) 2.5 (1.2 to 5)
1.3 (1.2 to 4.7)
| 46 (22 to 73) 62 (49 to 75)
94 (64 to 138)
|
Infants 3 mo to 1 yr 0.6 (n=17)
0.8 (n=9)
| — —
| 0.8 (0.3 to 3) 0.7 (0.5 to 0.8)
| 41 (24 to 68) 40 (27 to 70)
|
Pediatric 1 to 12 yrs 0.6 (n=27) 0.8 (n=18)
| 0.8 (0.4 to 2)
—
| 1 (0.5 to 3.3)
0.5 (0.3 to 1)
| 26 (17 to 39)
30 (17 to 56)
|
n = the number of patients who had time to maximum block recorded.
Clinical duration = time until return to 25% of control T1. Patients receiving doses of 0.45 mg/kg who achieved less than 90% block (16% of these patients) had about 12 to 15 minutes to 25% recovery.
Table 6 presents the time to onset and clinical duration for the initial dose of Rocuronium Bromide Injection under sevoflurane (induction) and isoflurane/nitrous oxide (maintenance) anesthesia in pediatric patients.
TABLE 6: Median (Range) Time to Onset and Clinical Duration Following Initial (Intubating) Dose During Sevoflurane (induction) and Isoflurane/Nitrous Oxide (maintenance) Anesthesia (Pediatric Patients)
Rocuronium Bromide Dose (mg/kg) Administered over 5 sec
| Time to Maximum Block (min)
| Time to Reappearance T3 (min)
|
Neonates birth to <28 days 0.45 (n=5) 0.6 (n=10) 1 (n=6)
| 1.1 (0.6 to 2.2) 1 (0.2 to 2.1) 0.6 (0.3 to 1.8)
| 40.3 (32.5 to 62.6) 49.7 (16.6 to 119) 114.4 (92.6 to 136.3)
|
Infants 28 days to ≤3 mo 0.45 (n=9) 0.6 (n=11) 1 (n=5)
| 0.5 (0.4 to 1.3) 0.4 (0.2 to 0.8) 0.3 (0.2 to 0.7)
| 49.1 (13.5 to 79.9) 59.8 (32.3 to 87.8) 103.3 (90.8 to 155.4)
|
Toddlers >3 mo to ≤2 yrs 0.45 (n=17) 0.6 (n=29) 1 (n=15)
| 0.8 (0.3 to 1.9) 0.6 (0.2 to 1.6) 0.5 (0.2 to 1.5)
| 39.2 (16.9 to 59.4) 44.2 (18.9 to 68.8) 72 (36.2 to 128.2)
|
Children >2 yrs to ≤11 yrs 0.45 (n=14) 0.6 (n=37) 1 (n=16)
| 0.9 (0.4 to 1.9) 0.8 (0.3 to 1.7) 0.7 (0.4 to 1.2)
| 21.5 (17.5 to 38) 36.7 (20.1 to 65.9) 53.1 (31.2 to 89.9)
|
Adolescents >11 to ≤17 yrs 0.45 (n=18) 0.6 (n=31) 1 (n=14)
| 1 (0.5 to 1.7) 0.9 (0.2 to 2.1) 0.7 (0.5 to 1.2)
| 37.5 (18.3 to 65.7) 41.4 (16.3 to 91.2) 67.1 (25.6 to 93.8)
|
n=the number of patients with the highest number of observations for time to maximum block or reappearance T3.
The time to 80% or greater block and clinical duration as a function of dose are presented in Figures 1 and 2.
FIGURE 1: Time to 80% or Greater Block vs. Initial Dose of Rocuronium Bromide by Age Group (Median, 25th and 75th Percentile, and Individual Values)
FIGURE 2: Duration of Clinical Effect vs. Initial Dose of Rocuronium Bromide by Age Group (Median, 25th and 75th Percentile, and Individual Values)
The clinical durations for the first 5 maintenance doses, in patients receiving 5 or more maintenance doses are represented in Figure 3 [see Dosage and Administration (2.3)].
FIGURE 3: Duration of Clinical Effect vs. Number of Rocuronium Bromide Maintenance Doses, by Dose
Once spontaneous recovery has reached 25% of control T1, the neuromuscular block produced by rocuronium bromide is readily reversed with anticholinesterase agents, e.g., edrophonium or neostigmine.
The median spontaneous recovery from 25% to 75% T1 was 13 minutes in adult patients. When neuromuscular block was reversed in 36 adults at a T1 of 22% to 27%, recovery to a T1 of 89 (50 to 132)% and T4/T1 of 69 (38 to 92)% was achieved within 5 minutes. Only 5 of 320 adults reversed received an additional dose of reversal agent. The median (range) dose of neostigmine was 0.04 (0.01 to 0.09) mg/kg and the median (range) dose of edrophonium was 0.5 (0.3 to 1) mg/kg.
In geriatric patients (n=51) reversed with neostigmine, the median T4/T1 increased from 40% to 88% in 5 minutes.
In clinical trials with halothane, pediatric patients (n=27) who received 0.5 mg/kg edrophonium had increases in the median T4/T1 from 37% at reversal to 93% after 2 minutes. Pediatric patients (n=58) who received 1 mg/kg edrophonium had increases in the median T4/T1 from 72% at reversal to 100% after 2 minutes. Infants (n=10) who were reversed with 0.03 mg/kg neostigmine recovered from 25% to 75% T1 within 4 minutes.
There were no reports of less than satisfactory clinical recovery of neuromuscular function.
The neuromuscular blocking action of rocuronium bromide may be enhanced in the presence of potent inhalation anesthetics [see Drug Interactions (7.3)].
Hemodynamics:
There were no dose-related effects on the incidence of changes from baseline (30% or greater) in mean arterial blood pressure (MAP) or heart rate associated with rocuronium bromide administration over the dose range of 0.12 to 1.2 mg/kg (4 x ED95) within 5 minutes after rocuronium bromide administration and prior to intubation. Increases or decreases in MAP were observed in 2% to 5% of geriatric and other adult patients, and in about 1% of pediatric patients. Heart rate changes (30% or greater) occurred in 0% to 2% of geriatric and other adult patients. Tachycardia (30% or greater) occurred in 12 of 127 pediatric patients. Most of the pediatric patients developing tachycardia were from a single study where the patients were anesthetized with halothane and who did not receive atropine for induction [see Clinical Studies (14.3)]. In US studies, laryngoscopy and tracheal intubation following rocuronium bromide administration were accompanied by transient tachycardia (30% or greater increases) in about one-third of adult patients under opioid/nitrous oxide/oxygen anesthesia. Animal studies have indicated that the ratio of vagal:neuromuscular block following rocuronium bromide administration is less than vecuronium but greater than pancuronium. The tachycardia observed in some patients may result from this vagal blocking activity.
Histamine Release:
In studies of histamine release, clinically significant concentrations of plasma histamine occurred in 1 of 88 patients. Clinical signs of histamine release (flushing, rash, or bronchospasm) associated with the administration of rocuronium bromide were assessed in clinical trials and reported in 9 of 1,137 (0.8%) patients.