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Cheong, Ki, Lee, Lee, Kim, Hur, Cho, Lim, Lee, Kim, and Lee: The combination of sugammadex and neostigmine can reduce the dosage of sugammadex during recovery from the moderate neuromuscular blockade

Abstract

Background

Sugammadex is a novel neuromuscular reversal agent, but its associated hypersensitivity reaction and high cost have been obstacles to its widespread use. In the interest of reducing the necessary dosage of sugammadex, the reversal time of the combined use of sugammadex and neostigmine from moderate neuromuscular blockade were investigated.

Methods

The patients enrolled ranged in age from 18 to 65 years old with American Society of Anesthesiologists class 1 or 2. The subjects were randomly assigned into one of the four groups (Group S2, S1, SN, and N; n = 30 per group). The reversal agents of each groups were as follows: S2 - sugammadex 2 mg/kg, S1 - sugammadex 1 mg/kg, SN - sugammadex 1 mg/kg + neostigmine 50 µg/kg + glycopyrrolate 10 µg/kg, N - neostigmine 50 µg/kg + glycopyrrolate 10 µg/kg. The time to recovery of the train-of-four (TOF) ratio was checked in each group.

Results

The time to 90% recovery of TOF ratio was 182.6 ± 88.9, 371.1 ± 210.4, 204.3 ± 103.2, 953.2 ± 379.7 sec in group S2, S1, SN and N, respectively. Group SN showed a significantly shorter recovery time than did group S1 and N (P < 0.001). However, statistically significant differences between the S2 and SN groups were not be observed (P = 0.291). No hypersensitivity reactions occurred in all groups.

Conclusions

For the reversal from rocuronium-induced moderate neuromuscular blockade, the combined use of sugammadex and neostigmine may be helpful to decrease the recovery time and can also reduce the required dosage of sugammadex. However, the increased incidence of systemic muscarinic side effects must be considered.

Introduction

Sugammadex is a novel agent for the reversal of neuromuscular blockade, which functions by forming complexes in a 1 : 1 ratio with steroidal neuromuscular blocking agents. In contrast with anticholinesterases and other classic neuromuscular reversal agents, sugammadex has shown little to no cholinergic side effects and residual muscle relaxation [1,2,3,4,5,6,7]. Above all, the greatest advantage of sugammadex was ultra-rapid reversal from neuromuscular blockade, regardless of the degree of neuromuscular blockade. Thus, sugammadex its clinical use has gained great interest [1,2,3,4,5,6,7]. However it has yet to be approved by the Food and Drug Administration of the USA (US FDA) due to the associated hypersensitivity reaction [8], and several previous studies have shown that the hypersensitivity reaction occurred more frequently at higher doses [9,10,11,12]. In addition, given that the price of sugammadex is much more expensive than classic neuromuscular reversal drugs, many anesthesiologists have been reluctant to use sugammadex in the interest of limiting health care spending costs [6,13,14].
To reduce the dosage and overall cost of sugammadex, the combined use of sugammadex and neostigmine has been attempted. In a previous study, the combined use of sugammadex 0.5 mg/kg and neostigmine 40 µg/kg showed shorter time to reversal from deep neuromuscular blockade than did sugammadex 1 mg/kg alone [14]. The investigators in this study, however, used sub-clinical dosages of sugammadex despite deep neuromuscular blockade, and, thus, these results are difficult to apply in the clinically. In addition, as many surgeries are performed with moderate neuromuscular blockade [15,16], we aimed to investigate recovery time from moderate neuromuscular blockade. Our pilot study to determine the dosage of sugammadex and neostigmine showed that the time to 90% recovery of train-of-four (TOF) ratio from moderate neuromuscular blockade (TOF count 1 or 2) was not significantly different between the combination of sugammadex 1 mg/kg and neostigmine 50 µg/kg group and sugammadex 2 mg/kg group (144 ± 15.8 vs. 125 ± 16.2 sec).
We generated the hypothesis that the combination of sugammadex 1 mg/kg and neostigmine 50 µg/kg was not inferior to sugammadex 2 mg alone in the time to recovery of TOF ratio from moderate neuromuscular blockade. We planned to compare the time to recovery of TOF ratio from moderate neuromuscular blockade between the use of sugammadex alone versus the combined use of sugammadex and neostigmine. In addition, the incidence of hypersensitivity reactions and systemic muscarinic side effects of each reversal agents were evaluated.

Materials and Methods

The present study was approved by our university Institutional Review Board. Written consent was obtained from all subjects who agreed to be involved in this study.
The 120 subjects were enrolled through the CONSORT process, as illustrated in Fig. 1. The inclusion criteria were age between 18 to 65 year olds; 1 or 2 American Society of Anesthesiologists (ASA) physical status; and scheduled for elective surgery in our hospital. The exclusion criteria were patients expected to have difficult intubation due to anatomical abnormality or limited neck mobility at preoperative evaluation; patients with neuromuscular abnormality; cardiovascular disease; kidney function disorder; liver function disorder; pregnancy; and history of side effects with anesthetics and analgesics. Experiment withdrawal criteria were unexpected massive hemorrhage; unrecovered electrocardiograph (ECG) abnormality; profound hypotension; respiratory abnormality; and TOF device error during experiment.
In the pilot study, we recorded the time to 90% recovery of TOF ratio in two group. The first group (n = 5) received intravenously administrated sugammadex 2 mg/kg alone, and the second group (n = 5) received sugammadex 1 mg/kg and neostigmine 50 µg/kg + glycopyrrolate 10 µg/kg. The time to 90% recovery of TOF ratio were 125 ± 16.2 sec in first group and 144 ± 15.8 sec in second group. Under the presumption that the difference of the time to 90% recovery of TOF ratio between groups was not more than 30 sec, the calculated sample size with alpha value 0.05 and power value 80% was 26 in each group. Considering 10% of the rate loss, the final sample size was determined to be 30 in each group.
The subjects were randomly assigned into one of four groups (Group S2, S1, SN and N). The Group S2 received sugammadex 2 mg/kg intravenously, group S1 received sugammadex 1 mg/kg, group SN received sugammadex 1 mg/kg and neostigmine 50 µg/kg + glycopyrrolate 10 µg/kg, and group N received neostigmine 50 µg/kg + glycopyrrolate 10 µg/kg for reversal of neuromuscular blockade. To minimize observer bias, the drugs were prepared in syringes labelled "reverse" by a third party. When bradycardia (heart rate; HR < 50 beats/min) or hypotension (mean blood pressure; MBP < 60 mmHg) occurred, atropine 0.5 mg or ephedrine 5 mg were administered.
All patients were received glycopyrrolate 4 µg/kg intramuscularly for premedication 30 minutes before the operation. After the subjects entered the operating room, the ECG, blood pressure (BP), and pulse oximetry were monitored and two stimulating electrodes of TOF-Watch® (NV Organon, OSS, The Netherlands) were attached over the ulnar nerve on the wrist at intervals of 3 to 4 cm and the accelerometer was fixed on the ipsilateral thumb. Anesthesia was induced with intravenous propofol 1.5-2.5 mg/kg and rocuronium 0.6 mg/kg, and maintained with sevoflurane 1.5-2.5 vol% and 50% N2O. During the operation, end tidal CO2 was maintained at 30-35 mmHg and axillary temperature was maintained 35.0-37.5℃. TOF count was monitored with 50 mA current, at 15 min intervals, and rocuronium 5-10 mg was administered intermittently to maintain TOF count under 2.
Following the operation, the anesthesiologist waited till the TOF count was 1 or 2, then the reversal agent of each group was administered. During the neuromuscular recovery period, the end-expiratory concentration of sevoflurane, displayed on the Primus anesthetic workstation (Dräger, Lübeck, Germany), was maintained to 1 minimal alveolar concentration. The TOF was checked every 15 sec till the TOF ratio reached 90%, and the time to 70, 80 and 90% recovery of TOF ratio were also recorded. In addition, the HR and BP were checked when the reversal drug was administered as well as 2, 5, 10 min thereafter. The presence or absence of a hypersensitivity reaction, including manifestations such as skin rash, hypotension, tachycardia and decreased SpO2 were recorded after administration of sugammadex. When the TOF ratio surpassed 90%, sevoflurane was discontinued and fentanyl 0.5 µg/kg and ramosetron 5 µg/kg were subsequently administered intravenously to control postoperative pain and nausea / vomiting (PONV).
At the post-anesthesia care unit, PONV score (0 = no nausea or vomiting, 1 = nausea but no vomiting, 2 = vomiting, 3 = persistent vomiting despite of additional therapy) and signs of residual neuromuscular blockade (removing the tongue after manual grasping, and maintaining head up for 5 seconds) were checked. Subsequently, BP and oxygen saturation were monitored for 30 minutes until the subjects returned to the wards. Before subjects went to the wards, patients were examined for signs of residual neuromuscular blockade once more.
All measured data are shown as mean ± standard deviation (SD). Differences of ASA physical status and PONV score among groups were analyzed using chi-square test or Fisher's exact test. The other continuous parameters were analyzed using the Kolmogorov-Smironov test. The normally distributed data were analyzed using ANOVA and a post-hoc analysis was performed by Tukey's HSD analysis. If the data did not follow a normal distribution, the Kruskal-Wallis test and Mann-Whitney U-test were used. The statistical analyses was conducted using SPSS version 18 (SPSS Inc., Chicago, IL, USA) and P value below 0.05 was assumed to be statistically significant.

Results

The age and body weight (BW) were normally distributed and the other values did not follow normal distribution. Baseline characteristics are shown in Table 1. The BW of the groups S1 and N showed statistically significant differences (P = 0.035), and the other values did not showed significant differences between each group.

TOF recovery time

The times to recovery of TOF ratio are shown in Table 2 and Fig. 2. The time to 70, 80, and 90% recovery of TOF ratio were not statistically significantly different between groups S2 and SN (P values were 0.368 in 70%, 0.456 in 80%, 0.291 in 90%). Group N showed statistically significant differences to the other groups (P < 0.001), however group S1 showed statistically significant difference to the SN (P = 0.001 in 70%, P < 0.001 in 80% and 90%) and S2 groups (P < 0.001).

Incidence of adverse effect

The MBP and HR after the administration of the reversal agents are shown in Table 3 and Fig. 3. Immediately following administration of the reversal agents, the MBP of group SN was significantly lower than that of group S2 and N (P = 0.013 and 0.027, respectively). After 5 min of the reversal agent administration, the MBP of the group SN and N were significantly lower than that of the S1 group (P = 0.001 and 0.005, respectively), and the MBP of the SN group was significantly lower than that of S2 (P = 0.01). Ten min after administration of the reversal agents, the N group showed significantly lower MBP than did the S2 and S1 groups (P = 0.002 and 0.014, respectively).
The HR of the SN group was significantly lower than that of S2 and S1 (P = 0.001 and 0.002, respectively), and the HR of the N group was also significantly lower that of group S2 and S1 (P < 0.001) after 5 min of the reversal agents administration. After 10 min of the reversal agents administration, group N showed significant lower HR than groups S2, S1 (P < 0.001), and SN (P = 0.007). The HR of group SN was significantly lower than that of group S2 (P = 0.031) 10 min following administration of the reversal agents. Bradycardia or hypotension was present in 3 patients in the SN group (10%) and in 4 patients in group N (13%). After one time administration of atropine 0.5 mg or ephedrine 5 mg intravenously, BP and HR were normalized.
There were no patients with PONV score over 3 in the postanesthetic care unit in all groups. The number of patients with PONV score 2 were 1 (3.3%), 1 (3.3%), 2 (6.7%), 4 (13.3%) in group S2, S1, SN, N, respectively. Moreover, there were no signs of hypersensitivity reactions and residual neuromuscular blockade in all subjects.

Discussion

The present study demonstrates that the combined use of sugammadex 1 mg/kg and neostigmine 50 µg/kg shortened the time to 90% recovery of TOF ratio than that of sugammadex 1 mg/kg alone in patients with moderate neuromuscular blockade. In addition, a statistically significant difference of the time to 90% recovery of TOF ratio could not be observed between the administration of sugammadex 2 mg/kg and the combined use of sugammadex 1 mg/kg and neostigmine 50 µg/kg.
Anticholinesterases have been used most commonly for the reversal of neuromuscular blockade [1,5]. Anticholinesterase inhibits the breakdown of acetylcholine within the neuromuscular junction by reversibly attaching to acetylcholinesterase. Increased acetylcholine within the neuromuscular junction competes against non-depolarizing neuromuscular blocking agents and affects the nicotinic receptor in the motor end plate [1,5]. Anticholinesterase action can evoke systemic muscarinic side effects such as bradycardia, QT interval prolongation, PONV, an bronchial spasm, by affecting the branches of the autonomic nervous system that use acetylcholine as the neurotransmitter [1,17,18]. To reduce systemic muscarinic side effects of anticholinesterase activity, anticholinergic drugs such as atropine or glycopyrrolate are administrated with anticholinesterase. Since anticholinesterase cannot inactivate or break down neuromuscular blocking agents themselves, the residual neuromuscular blockade or recurarization by neuromuscular blocking agent can occur [19,20]. Therefore, respiratory complications such as atelectasis and pneumonia may occur in the recovery period, as can hypoxic brain damage in more severe cases [1,21,22,23].
Sugammadex is a recently-developed neuromuscular reversal agent that can overcome the limitations of anticholinesterase. Sugammadex has a modified γ-cyclodextrin structure that forms a complex in a 1 : 1 ratio with steroidal neuromuscular blocking agents, thereby inactivating the neuromuscular blocking agent. This mechanism enables fast reversal from neuromuscular blockade regardless of the depth of the neuromuscular blockade [1,2,3,4]. Moreover sugammadex is not associated with the systemic muscarinic side effects of anticholinesterase [1,2,3,4]. However, the hypersensitivity reaction has been a major obstacle to its wide-spread clinical application [8,9,24,25]. This adverse reactions occurs within 5 min of sugammadex administration and can be life-threatening, manifesting as skin rash, hypotension, tachycardia or decreased SpO2 [8,24,25]. The hypersensitivity reaction was known to occur with first exposure of sugammadex, and it was hypothesized that patients were sensitized by the cyclodextrins present in food [8]. The dosage of sugammadex associated with hypersensitivity were 1.8 to 32.0 mg/kg [8,12,24,25], and it was thought to occur more frequently at higher doses [9,10,11]. Hypersensitivity reactions were not be observed in the present study. The incidence of hypersensitivity with sugammadex is not known, however it is considered to be low and to be dose-dependent [9,10,11]. Since the number of subjects in the present study may be too small to observe hypersensitivity reaction, it is not clear if the absence of hypersensitivity in the present study was related to the low dosage of sugammadex. Moreover, the presumption that the hypersensitivity reaction of sugammadex occurs in a dose-dependent manner has yet to be verified, and more clinical experience with large-scale studies may be needed. However reducing the dosage of sugammadex may be a viable alternative for the anesthesiologist who raises concern regarding the hypersensitivity reaction and higher costs associated with sugammadex. In the present study, sugammadex and neostigmine were combined, under the hypothesis that the neuromuscular reversal effect of sugammadex and neostigmine may be synergistic due to different neuromuscular reversal mechanisms. To test this hypothesis, the S1 and SN groups were compared. In addition, we investigated whether the combined use of sugammadex and neostigmine could reduce the dose requirements of sugammadex by comparing the S2 and SN group.
There have been several studies comparing sugammadex and neostigmine [13,17,18,26,27]. Blobner et al. [26] compared the neuromuscular reversal time from moderate muscle blockade of sugammadex and neostigmine. The time taken from TOF count 2 to TOF ratio 90% was 90 sec in the group that received sugammadex 2 mg/kg; 1,116 sec in the group that received neostigmine 50 µg/kg and glycopyrrolate 10 µg/kg during anesthesia with sevoflurane. Kakinuma et al. [14] showed that the combined use of sugammadex and neostigmine was more effective than the use of sugammadex alone in the setting of profound neuromuscular blockade induced by rocuronium. In the present study, sugammadex 1 mg/kg were administered in the control group and sugammadex 0.5 mg/kg and neostigmine 40 µg/kg were administered in the experimental group 5 min after administration of rocuronium 0.6 mg/kg. The times to 90% recovery of TOF ratio were 29.9 ± 7.5 min in the control group and 18.8 ± 8.9 min in the experimental group. However the results of this study are difficult to extrapolate into clinical anesthesia, given that the dosage of sugammadex was too small despite profound neuromuscular blockade. The present study measured the recovery time from moderate neuromuscular blockade, in contrast with the previous study, given that most surgeries required moderate depth of neuromuscular blockade to an approximate TOF count 1-2 [15,16]. Moreover 2 mg/kg of sugammadex was used, which was the most effective dosage at moderate neuromuscular blockade [1,2,4,5,27,28].
Neostigmine can cause systemic muscarinic side effects, such as bradycardia, hypotension, and PONV [1,17,18]. Geldner et al. [17] showed that the HR in the group that received neostigmine was lower than that of the group the group that received sugammadex. PONV, however, was affected by patients' risk factors rather than the kinds of drugs administered. Hovorka et al. [29] also showed that neostigmine has no effect on the incidence or severity of PONV. In the present study, to reduce the systemic muscarinic side effect, glycopyrrolate was administered with neostigmine. Nevertheless, the BP and HR of the neostigmine administered groups were lower than that of the sugammadex only groups, particularly at 5, 10 min following the administration of the reversal agent (Fig. 3). Furthermore, bradycardia or hypotension occurred in groups that received neostigmine: 10% in the SN group, 13% in group N. Nonetheless, this was easily stabilized by administration of atropine or ephedrine once. To reduce PONV, ramosetron 5 µg/kg was also administered intravenously. The incidence of PONV in the post-anesthetic care unit was 3.3, 3.3, 6.7, 13.3% in group S2, S, SN, N, respectively, and severe PONV (PONV score over 3) was not observed among all groups. However, it is not clear that neostigmine increased PONV, given that the number of subjects was too small to analyze the incidence of the PONV. Overall, the incidence of systemic muscarinic side effects, including bradycardia and hypotension, may be increased after neostigmine administration.
Many anesthesiologists agree that sugammadex is a very fascinating agent that has many advantages over anticholinesterase. However the relatively higher cost of sugammadex has been a constraint on its use [6,13,14]. The approximate costs of drugs are as follows (May 2015 in Korea):
Sugammadex (Bridion®, MSD, Seoul, Korea): 142 USA dollar (USD) in 200 mg
Neostigmine (Daihan-neostigmine®, Daihan Pharm, Seoul, Korea): 0.45 USD in 0.5 mg
Glycopyrrolate (Mobinul®, Myungmoon Pharm, Seoul, Korea): 0.65 USD in 0.2 mg
The costs of reversal agents per BW (kg) in each groups can be calculated as follows:
Group S2: (142 × 2 × BW) / 200
Group S1: (142 × 1 × BW) / 200
Group SN: (142 × 1 × BW) / 200 + (0.45 × 0.05 × BW) / 0.5 + (0.65 × 0.01 × BW) / 0.2
Group N: (0.45 × 0.05 × BW) / 0.5 + (0.65 × 0.01 × BW) / 0.2
The opportunity cost in the operating theater was assumed £4.44 (about 7 USD) per min [13], and calculated using the following equation: 7 × Time to 90% recovery of TOF ratio (min). The estimated total cost was defined as the sum of cost of reversal agents and the opportunity cost in the operating theater. The estimated total costs of each groups were 107.9 ± 17.1, 91.5 ± 24.8, 73.5 ± 13.9, 115.9 ± 44.2 (95% CI: 101.5-114.2, 82.3-100.8, 68.2-78.7, 99.4-132.4) USD in group S2, S1, SN, N, respectively. The estimated total cost of group S2 was not significantly different from that of group N (P = 0.665), and the estimated total cost of group SN was significantly lower than that of group S2 and N (P < 0.001). Group SN showed the fast recovery time, similar with that of group S2, with the lowest cost. Sugammadex was commercialized under the name of Bridion®, and it contained 200 mg per ampule. One ampule is enough to reverse moderate neuromuscular blockade by administering 2 mg/kg, if the patient's weight is under 100 kg. Therefore the drug cost calculation of the present study may not be coincident with the actual cost. However, if a sugammadex ampule of under 200 mg is released, overall costs may be reduced by combined use of sugammadex and neostigmine.
The combination of sugammadex and neostigmine has its advantages and disadvantages. Given the dosage and cost, the combination of sugammadex 1 mg/kg and neostigmine 50 µg/kg can replace the sugammadex 2 mg/kg alone. However the incidence of systemic muscarinic side effects, such as bradycardia, hypotension, and PONV may be increased with neostigmine administration. Although the side effects were not serious and easily controlled in the present study, the use of sugammadex alone may be beneficial if the higher cost and increased probability of hypersensitivity are not considered.
The present study has several limitations. Firstly, the BW of the group S1 and N showed significant differences (P = 0.035). The BW influences the dosage of administered drugs, which can influence the data of the present study including the time to recovery of TOF ratio, MBP, HR and PONV score. However, the comparison between group S1 and N are less important than the comparison between SN and S2; S2 and S1. The faster recovery and lower incidence of the systemic muscarinic side effect using sugammadex compared to neostigmine has been shown in previous studies [1,2,3,4,5,13,17]. Secondly, neostigmine also can cause hypersensitivity, albeit rare [30]. According to the New Drug Application of the US FDA at 2013 [30], there have been 5 reported anaphylaxis or hypersensitivity cases related to the use of neostigmine. Thirdly, the opportunity cost for the operating theater in Korea was not evaluated. The referred opportunity cost of the present study was estimated according to circumstances in the United Kingdom (UK) [13]. The opportunity cost of the operating theater include factors such as the cost of the anesthetic management, personnel expenses for surgery teams, and average profit of operating theater per time. The data regarding the opportunity cost for the operating theater in Korea could not be found and, thus, the investigators referenced data from the UK. Since health care in the UK is operated by the National Health Service in a manner similar to the National Health Insurance Service in Korea, the referred opportunity cost may be similar to that of Korea.
In conclusion, for the reversal of rocuronium induced moderate neuromuscular blockade, the combined use of sugammadex and neostigmine may be helpful to decrease the recovery time and can reduce the dose requirement of sugammadex. The clinical anesthesiologist, however, must consider the increased incidence of systemic muscarinic side effects when using sugammadex combined with neostigmine.

Acknowledgments

This work was supported by the 2011 Inje University research grant.

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Fig. 1

CONSORT flow diagram.

kjae-68-547-g001.jpg
Fig. 2

The time to 70, 80 and 90% recovery of TOF ratio. Group N showed significantly longer time to 70, 80 and 90% recovery of TOF ratio than the other groups (P < 0.001). Group S2 and Group SN did not show significant difference in time to 70, 80 and 90% recovery of TOF ratio. The thick lines represent the median values, boxes indicate the interquartile range, whiskers represent the 10th and 90th percentiles, and block dots represent outliers. Group S2: sugammadex 2 mg/kg, Group S1: sugammadex 1 mg/kg, Group SN: sugammadex 1 mg/kg + neostigmine 50 µg/kg + glycopyrrolate 10 µg/kg, Group N: neostigmine 50 µg/kg + glycopyrrolate 10 µg/kg (*P < 0.05 when compared with group S1, P < 0.001 when compared with the other groups, P < 0.001 when compared with group S1).

kjae-68-547-g002.jpg
Fig. 3

The trend of the (A) mean blood pressure (MBP), and (B) heart rate (HR) after administration of neuromuscular reversal agents. (A) Immediately after the reversal agents administration, the MBP of group SN was significantly lower than group S2 and N (P < 0.05). After 5 min of the reversal agents administration, the MBP of the group SN and N were significantly lower than that of group S1 (P < 0.05), and the MBP of group SN was significantly lower than that of S2 (P < 0.05). After 10 min of the reversal agents administration, group N showed significantly lower MBP than group S2 and S1 (P < 0.05). (B) The HR of the group N were significantly lower than group S1 and S2 after 5 and 10 min of the reversal agents administration (P < 0.001). The group SN showed significantly lower HR than group S2 and S1 (P < 0.05) after 5 min, and significantly higher HR than group N (P < 0.05) and lower HR than group S2 (P < 0.05) after 10 min of the reversal agents administration. The thick lines represent the median values, boxes indicate the interquartile range, whiskers represent the 10th and 90th percentiles, and block dots represent outliers. Group S2: sugammadex 2 mg/kg, Group S1: sugammadex 1 mg/kg, Group SN: sugammadex 1 mg/kg + neostigmine 50 µg/kg + glycopyrrolate 10 µg/kg, Group N: neostigmine 50 µg/kg + glycopyrrolate 10 µg/kg (*P < 0.05, P < 0.001 when compared between groups).

kjae-68-547-g003.jpg
Table 1

Baseline Characteristics

Group S2 Group S1 Group SN Group N
Number (person) 30 30 30 30
Sex (M/F) 17/13 16/14 17/13 8/22
Age (yr) 44.7 ± 15.2 52.5 ± 15.3 45.1 ± 13.7 46.9 ± 12.2
Weight (kg) 61.2 ± 10.3 67.9 ± 11.3 63.0 ± 11.1 60.6 ± 8.9
Height (cm) 164.0 ± 7.6 164.6 ± 9.1 163.4 ± 9.0 162.1 ± 6.6
ASA (I/II) 18/12 17/13 21/9 19/11
Type of Operation
 Face or neck surgery 18 13 15 17
 Laparoscopic surgery 5 6 6 4
 Laparotomy surgery 5 6 7 6
 Surgery of extremities 2 5 2 3

Values are expressed as number or mean ± standard deviation. Group S2: sugammadex 2 mg/kg, Group S1: sugammadex 1 mg/kg, Group SN: sugammadex 1 mg/kg + neostigmine 50 µg/kg + glycopyrrolate 10 µg/kg, Group N: neostigmine 50 µg/kg + glycopyrrolate 10 µg/kg. ASA: American Society of Anesthesiologists physical status.

Table 2

The Time to Recovery of TOF Ratio (sec)

TOF ratio Group P value
S2 S1 SN N
70% 113.2 ± 55.3*,†
(92.5-133.8)
225.5 ± 156.2*
(167.2-283.8)
130.7 ± 67.1*,‡
(105.7-155.8)
635.5 ± 317.0
(517.2-753.9)
< 0.001
80% 144.8 ± 69.5*,†
(118.8-170.7)
286.7 ± 167.3*
(224.2-349.2)
168.3 ± 94.5*,†
(133.1-203.7)
793.3 ± 350.5
(662.5-924.3)
< 0.001
90% 179.2 ± 88.3*,†
(146.2-212.2)
371.1 ± 210.5*
(292.5-449.7)
204.3 ± 103.3*,†
(165.7-242.9)
953.2 ± 379.8
(811.4-1,095.0)
< 0.001

Values are expressed as mean ± standard deviation (95% confidence interval). Group S2: sugammadex 2 mg/kg, Group S1: sugammadex 1 mg/kg, Group SN: sugammadex 1 mg/kg + neostigmine 50 µg/kg + glycopyrrolate 10 µg/kg, Group N: neostigmine 50 µg/kg + glycopyrrolate 10 µg/kg (*P < 0.001 when compared with group N, P < 0.001 when compared with group S1, P < 0.05 when compared with group S1).

Table 3

The Mean Blood Pressure (MBP) and Heart Rate (HR) after Administration of Reversal Agents

Time after reverse (min) Group P value
S2 S1 SN N
MBP (mmHg) 0 77.9 ± 12.7* 74.6 ± 11.6 70.1 ± 10.3 76.2 ± 11.4* 0.049
2 77.8 ± 14.2 77.8 ± 13.3 74.5 ± 12.6 77.8 ± 14.6 0.641
5 79.1 ± 13.7* 83.3 ± 15.6*,† 70.9 ± 10.4 72.4 ± 13.9 0.002
10 88.2 ± 16.0 86.7 ± 17.6 80.1 ± 14.6 75.3 ± 13.1 0.007
HR (bpm) 0 75.4 ± 11.8 73.0 ± 12.2 71.3 ± 12.0 71.1 ± 13.2 0.354
2 70.5 ± 11.3 71.2 ± 11.1 73.3 ± 11.3 68.6 ± 12.3 0.251
5 71.3 ± 12.7*,‡ 70.1 ± 12.7*,‡ 61.5 ± 10.9 58.1 ± 11.7 < 0.001
10 78.2 ± 12.7*,‡ 73.1 ± 12.4 69.2 ± 17.8 56.5 ± 10.3* < 0.001

Values are expressed as mean ± standard deviation. Group S2: sugammadex 2 mg/kg, Group S1: sugammadex 1 mg/kg, Group SN: sugammadex 1 mg/kg + neostigmine 50 µg/kg + glycopyrrolate 10 µg/kg, Group N: neostigmine 50 µg/kg + glycopyrrolate 10 µg/kg (*P < 0.05 when compared with group SN, P < 0.05 when compared with group N, P < 0.001 when compared with group N).



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