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Comparison of intrathecal levobupivacaine combined with sufentanil, fentanyl, or placebo for elective caesarean section: a prospective, randomized, double-blind, controlled study.
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PMID:  24465046     Owner:  NLM     Status:  PubMed-not-MEDLINE    
BACKGROUND: The addition of opioids to local anesthetics contributes to the quality of spinal anesthesia and postoperative analgesia.
OBJECTIVE: In our prospective, randomized, double-blind, controlled study, our aim was to compare the effect of low-dose sufentanil plus levobupivacaine or a fentanyl plus levobupivacaine mixture on anesthesia quality, block characteristics, newborn and mother well-being, surgeon satisfaction, and duration of postoperative analgesia.
METHODS: Ninety-three patients were randomized into 3 groups (n = 31). Patients in Group C received 0.5% levobupivacaine (2.2 ± 0.2 mL), Group S received 2.5 µg sufentanil plus 0.5% levobupivacaine (2.2 ± 0.2 mL), and Group F received 10 µg fentanyl plus 0.5% levobupivacaine (2.2 ± 0.2 mL) intrathecally completed to a volume of 3 mL with the addition of saline in all groups. Patients' demographics, sensory and motor block characteristics, hemodynamics, Apgar scores, umbilical blood gas values, maternal side effects, surgeon satisfaction score, time to first analgesia requirement, and additional analgesic use within 24 hours were recorded.
RESULTS: In Group S and Group F, target levels of sensory and motor block were achieved more rapidly (P < 0.001). The hemodynamic values were lower (P < 0.05), and the duration of sensory blockade and the time of first analgesic requirement were longer (P < 0.001) in Group S. Additional analgesic requirement during first 24-hour period was lowest in Group S, and highest in Group C (P < 0.001). Apgar scores and umbilical blood gas samples were similar between groups. Postoperative pruritus was more frequent in Group S (P < 0.001) and surgeon satisfaction score was significantly lower in Group C (P = 0.003).
CONCLUSIONS: We suggest that the addition of sufentanil and fentanyl to intrathecal levobupivacaine during caesarean section surgery is more effective than the administration of levobupivacaine alone. The addition of sufentanil to levobupivacaine allowed rapid onset time for sensory and motor block levels. It also extended the duration of postoperative analgesia and led to a decrease in total analgesic requirement. identifier: NCT01858090.
Nesrin Bozdogan Ozyilkan; Aysu Kocum; Mesut Sener; Esra Caliskan; Ebru Tarim; Pinar Ergenoglu; Anis Aribogan
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Current therapeutic research, clinical and experimental     Volume:  75     ISSN:  0011-393X     ISO Abbreviation:  Curr Ther Res Clin Exp     Publication Date:  2013 Dec 
Date Detail:
Created Date:  2014-01-27     Completed Date:  2014-01-27     Revised Date:  2014-01-30    
Medline Journal Info:
Nlm Unique ID:  0372621     Medline TA:  Curr Ther Res Clin Exp     Country:  United States    
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Languages:  eng     Pagination:  64-70     Citation Subset:  -    
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Journal ID (nlm-ta): Curr Ther Res Clin Exp
Journal ID (iso-abbrev): Curr Ther Res Clin Exp
ISSN: 0011-393X
Publisher: Elsevier
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© 2013 The Authors
Accepted Day: 21 Month: 9 Year: 2013
pmc-release publication date: Day: 1 Month: 12 Year: 2013
Print publication date: Month: 12 Year: 2013
Volume: 75First Page: 64 Last Page: 70
PubMed Id: 24465046
ID: 3898189
Publisher Id: S0011-393X(13)00026-X
DOI: 10.1016/j.curtheres.2013.09.003

Comparison of Intrathecal Levobupivacaine Combined with Sufentanil, Fentanyl, or Placebo for Elective Caesarean Section: A Prospective, Randomized, Double-Blind, Controlled Study
Nesrin Bozdogan Ozyilkan, MD1 Email:
Aysu Kocum, MD1
Mesut Sener, MD1
Esra Caliskan, MD1
Ebru Tarim, MD2
Pinar Ergenoglu, MD1
Anis Aribogan, MD1
1Anesthesiology and Reanimation Department, Baskent University School of Medicine, Adana, Turkey
2Department of Gyneocology and Obstetrics, Baskent University School of Medicine, Adana, Turkey
Address correspondence to: Nesrin Bozdogan Ozyilkan, MD, Anesthesiology and Reanimation Department, Baskent University School of Medicine, 39 Sk No. 6 01250, Yuregir/Adana, Turkey.


Spinal anesthesia is a preferred method in elective and emergency caesarean section surgeries.1,2 Levobupivacaine is a frequently used local anesthetic (LA) due to its longer sensory block, lower cardiac toxicity, and shorter motor block properties.3–5 The addition of opioids to LA spinal anesthesia increases anesthesia quality and ensures effective analgesia during intraoperative and early postoperative periods.6–9 For this reason, the strongly lipophilic drugs sufentanil and fentanyl are preferred during caesarean section surgeries.7,8,10 However, these agents may cause dose-dependent side effects on fetal heart rate in newborns such as bradycardia, as well as various side effects in the mother such as maternal hypotension, pruritus, nausea, vomiting, and respiratory depression.7,11,12 The doses of fentanyl and sufentanil that would provide effective analgesia and minimum side effects were reported to be 10 to 25 µg and 2.5 to 5 µg, respectively.6–8,10,12–15 Furthermore, the equivalent dose range between fentanyl and sufentanil during intrathecal administration was identified as 3.4 to 4.5:1.11,12

Although there are studies in the literature comparing the effectiveness of fentanyl and sufentanil added as adjuvants to 0.5% levobupivacaine during spinal anesthesia, there is no consensus regarding which agents would be more effective. In our prospective, randomized, double-blind, controlled study, our aim was to compare the effect of adding low-dose fentanyl (10 µg) or sufentanil (2.5 µg) to 0.5% levobupivacaine (2.2 ± 0.2 mL) on anesthesia quality, block characteristics, side effects, duration of postoperative analgesia, and surgeon satisfaction score.

Patients and Methods

Following the approval by the Baskent University Ethics Committee (No. KA08/48) and receipt of written informed consents from patients, 93 pregnant women older than age 18 years without fetal distress/anomaly (ie, gestational pregnancy age ≥36 weeks, height ≥155 cm, weight ≤110 kg, and fetal weight ≥2500 g) and with American Society of Anesthesiologists physical status of I to II who were undergoing elective caesarean section were enrolled in the study. Patients with allergies to any local anesthetic, with a history of hypersensitivity and anaphylactic reactions, who were taken to emergency surgery, and who had pre-eclampsia were excluded.

Patients were randomized by a computer into 3 groups. The demographic data and gestational age of patients were recorded. No premedications were administered. Following monitoring with noninvasive blood pressure, electrocardiogram, and pulse oxymeter in all patients, Ringer’s lactate solution (15 mL/kg) was administered for 10 to 15 minutes. Spinal anesthesia was performed in the sitting position with midline approach at the L3–L4 intervertebral space by an anesthesiologist blinded to the drug injected. The drug syringes were prepared before injection by another anesthesiologist who was not involved in the study. Intraoperative and postoperative assessments were performed by an anesthesiologist blinded to patient allocations and study drugs. The study drugs included 2.2 mL (11 mg) levobupivacaine (Chirocaine; Abbott Laboratories, Abbott Park, Illinois) administered to patients with height <163 cm, whereas 2.4 mL (12 mg) levobupivacaine was administered to patients with height ≥163 cm. In addition, 2.2 ± 0.2 mL 0.5% levobupivacaine plus 10 µg fentanyl (Fentanyl citrate ampule 50 µg/mL; Johnson & Johnson, New Brunswick, New Jersey) was administered to Group F and 2.2 ± 0.2 mL levobupivacaine plus 2.5 µg sufentanil (Sufenta; Johnson & Johnson, New Brunswick, New Jersey) was administered to Group S at rate of 3 mL/30 sec and completed to a volume of 3 mL with the addition of saline in all groups. Following intrathecal administration, patients were placed in the supine position and their heads were slightly elevated. Patients were then directed to a left lateral position with a 15˚ to 20° angle to prevent aortocaval compression, and oxygen (at 2–4 L/min) was provided with a facemask.

Sensory block was evaluated every 2 minutes with a pinprick test; motor block was evaluated with the Bromage scale (0 = no motor loss, 1 = inability to flex the hip, 2 = inability to flex the knee, and 3 = inability to flex the ankle). Onset times for sensory and motor blocks were recorded. Surgical intervention was initiated when block reached the T5 level. If sensory block did not achieve the T5 level within 20 minutes, general anesthesia was administered.

Onset time of sensory block at the L1-T10 level, the highest level of sensory block, duration of sensory block, time for 2-segment regression of sensory block through the T10 level, and the onset and duration of motor block were recorded.

Systolic blood pressure (SBP) and diastolic blood pressure (DBP), heart rate (HR), and oxygen saturation were evaluated every 3 minutes during the first 15 minutes, and every 5 minutes afterward. If SBP values decreased >20% with respect to the baseline values, or decreased to <100 mm Hg, fluid loading and ephedrine (5 mg) were administered. A decrease in heart rate to <55 beats/min was considered bradycardia and atropine (0.5 mg) was administered. A decrease in the respiratory rate to <10/min, and a decrease in oxygen saturation to <90% were considered indications of respiratory depression. In such cases, support was provided with facemask ventilation.

Apgar scores were evaluated at first and fifth minutes by a pediatrician with no information regarding the groups. For blood gas measurements, samples were obtained from the umbilical cord of newborns.

Intraoperative pain evaluation was performed with the visual analog scale (VAS) (0 = no pain and 10 = worst pain possible) while performing surgical incision, uterine incision, and skin closure. In cases where VAS >3, IV fentanyl (50 µg) was administered. Sedation levels were monitored, and propofol (up to 0.5 mg/kg) was administered if patients had still discomfort. When patients required >50 µg fentanyl and/or 0.5 mg/kg propofol, the block was considered unsuccessful and general anesthesia was administered. Intraoperative and postoperative nausea, vomiting, pruritus, respiratory depression, and other side effects were recorded at the first, second, sixth, and 12th hours. Metoclopramide (10 mg IV) was administered for nausea, and diphenhydramine (25 mg) was administered for severe pruritus.

Surgeries were performed by the same surgeon with no knowledge regarding the group allocation. Surgeon satisfaction score was evaluated according to the sufficiency of muscle relaxation and the provision of adequate surgical conditions (0 = poor, 1 = fair, 2 = good, and 3 = excellent).

The time of first analgesic requirement was recorded for the patients, and pethidine hydrochloride (50 mg IM) was administered as the first analgesic choice when VAS score was >3 and additional analgesic requirements were satisfied with diclofenac sodium (75 mg IM). The total amount of diclofenac sodium required during the first 24 hours was also recorded.

Statistical Analysis

Data analysis was performed using SPSS (version 17.0, IBM-SPSS Inc, Armonk, New York). The primary outcome of this study was the duration of sensory block. The mean duration of sensory block was assumed to be 140 ±34.4 minutes based on a previous study,14 in which a group of patients received fentanyl. A power analysis indicated that 25 patients per group were required to detect an increase in duration of sensory block by 20%. We allowed for 6 more patients in each group to compensate for drop-outs during the study period. Categorical measurements were recorded as numbers and percentages, continuous measurements as mean (SD), and also the median (minimum–maximum) where necessary. In the comparison of categorical variables, the χ2 test or the Fisher exact test were used. The ANOVA test was used for distributions in the comparison of continuous measurements between the groups, whereas the Kruskal-Wallis test was used for parameters without normal distribution. Hemodynamic data were analyzed with repeated measures analysis. The α error was set at 0.05, type II error was set at 0.20, and a P value <0.05 was considered significant for all comparisons.


Ninety-three patients scheduled for caesarean sections were enrolled in the study. Figure 1 presents the allocation of patients into the study groups. No significant intergroup differences were identified with regard to individual characteristics, the duration of surgery, and total fluid use (Table I). All groups had similar baseline SBP, DBP, and HR values. All groups had a significant SBP and DBP decrease with respect to the baseline values (P = 0.001 and P = 0.029, respectively) during the third minute, with the highest decrease in Group S, and the lowest decrease in Group C (Figure 2). The number of patients requiring ephedrine, and the administered ephedrine doses were similar between all groups (Table I). In Group S, 4 patients were treated with atropine due to bradycardia (P < 0.05), and HR values were significantly higher than the basal values at the sixth, ninth, and 12th minutes (P = 0.007, P = 0.007, and P = 0.004, respectively). HR values did not differ in comparison to baseline values in Group F and Group C. Oxygen saturation values were similar between groups and above 90% at all times.

The onset time of sensory block, the onset time of the block reached the T10 level—the highest sensory block level—and the onset time of motor block were significantly longer in Group C (P < 0.001), whereas no significant differences were identified between Group S and Group F. The highest block level (T4) and the duration of motor block was similar in all 3 groups, and no significant difference was observed between groups with regard to the time of 2-segment regression of the sensory block. The time of regression of the sensory block to the T10 level and the duration of sensory block was significantly longer for Group S (P = 0.003 and P < 0.001, respectively) (Table II).

VAS values for surgical incision, uterus incision, and skin closure, as well as intravenous fentanyl demand and sedation requirement were significantly higher in Group C (P < 0.05 for each comparisons) (Table III). The time to first analgesic requirement was significantly longer and the analgesic demand during the first 24 hours was significantly lower in Group S (P < 0.001) (Table II).

Apgar scores and umbilical venous blood gas values (pH, oxygen partial pressure, carbon dioxide partial pressure, and base excess) were similar between groups and within normal ranges (Table IV).

During the intraoperative period, all groups were similar with regard to the frequency of complications. Postoperatively, the frequency of pruritus was significantly higher in Group S for the first 2 hours (P < 0.001). One patient in Group S had pruritus and eruption on the legs, whereas 1 patient in Group C developed lumbar pain. However, no further complications were observed in the patient follow-ups (Table V).

Surgeon satisfaction score was statistically lower in Group C in comparison to the other groups (P = 0.003) (Figure 3).


Spinal anesthesia is preferred over epidural anesthesia due to its rapid onset, the higher level of muscle relaxation, and the lower dose requirement of LA during caesarean section. It ensures reliable and good quality of block for both the mother and the newborn.1

In our study, the duration of sensory block and first analgesic requirement were longer and analgesic requirement during the 24-hour period was lower in Group S, and sufficient intraoperative anesthesia could not be ensured. The frequency of perioperative pruritus was also higher in the sufentanil group. Surgeon satisfaction score was insufficient in all groups, being the lowest in the control group.

In caesarean section surgeries performed under spinal anesthesia, it has been reported that the administration of LA alone has a short duration of effect, that it is insufficient for preventing visceral pain and nausea especially during uterus manipulation and peritoneum closure, and that it leads to postoperative analgesic requirement at an earlier stage.15–17 The most frequently used agent among intrathecal opioids is fentanyl, which was demonstrated to be effective for 180 to 240 minutes when administered at doses of 10 to 25 µg.7 Sufentanil is also a lipophilic opioid; it has been reported that its onset of effect is more rapid,16,18–20 and that its duration of effect is 25% longer than fentanyl.21 Due to the rapid onset of its effects, as well as the effective postoperative analgesia that it ensures, sufentanil is an alternative to fentanyl and other opioids, and its use is becoming increasingly more common in caesarean section surgeries. In our study, we also aimed to determine the effectiveness of sufentanil.

The selection of different combinations and suitable doses when using opioids with LAs requires a careful consideration of factors such as the formation of sensory and motor block, the quality and duration of postoperative analgesia, and the side effects that might be observed in the mother and the newborn.2,14 In previous studies, the fact that different results were reported in normal individuals despite the use of similar dosages is associated with the differing distribution of the drugs during pregnancy.1,12,14,17,22 For caesarean section surgeries, the minimum intrathecal dose was reported as 10.58 mg levobupivacaine,8 6.25 μg fentanyl,23 and 1.5 to 2.5 μg sufentanil.11 We have also used a low-dose LA and adjuvant opioid in our study.

In Vercauteren et al22 an intrathecally administered 2 mL 0.125% levobupivacaine plus 1.5 µg sufentanil plus 2.5 µg epinephrine combination was used for delivery analgesia, and reported onset times for sensory block (4.4 minutes) were longer than the times obtained for the sufentanil and fentanyl groups in our study. This can be explained with the higher sufentanil concentrations and doses in our study. With a combination of 8 mg levobupivacaine plus 2.5 µg sufentanil, Gautier et al24 reported that the mean time to the highest level of sensory block was 17 minutes. In our study, this time was determined as 8.54 minutes with the levobupivacaine plus sufentanil combination, 7.52 minutes with the levobupivacaine plus fentanyl combination, and 12.7 minutes with the levobupivacaine only group. The shorter times in our study might be associated with the higher levobupivacaine doses.

In studies where intrathecal levobupivacaine was used alone, motor block onset times were reported as 10.0 minutes by Glaser et al25 and as 15 minutes by Burke et al.26 In our study, the addition of opioids to LA decreased onset times of motor block for levobupivacaine (Group S 3.75 minutes, Group F 3.0 minutes, and Group C 10.0 minutes). In a study comparing the effects of fentanyl addition (10, 15, or 25 μg) to intrathecal levobupivacaine (5, 7.5, or 10 mg) on sensory and motor blocks, the time to maximum motor block was reported as being shorter in the 10 mg levobupivacaine plus fentanyl group.27 Similarly in our study, motor and sensory block levels increased more rapidly in comparison to the control group; this effect was probably associated with the lipophilic character of sufentanil and fentanyl.

In studies comparing sufentanil with fentanyl, longer spinal anesthesia durations have been reported with sufentanil.13–15,21,28 In the study by Dahlgren et al,14 where 2.5 or 5 µg sufentanil and10 µg fentanyl was added to bupivacaine, and in the study by Meininger et al,13 where 2.5 or 5 µg sufentanil and10 µg fentanyl was added to 60 mg 2% mepivacaine, effective spinal analgesia durations were found to be higher in sufentanil groups in comparison to fentanyl and placebo groups. In our study, the duration of sensory block was, in agreement with the literature, significantly longer in the sufentanil group. The fact that this duration was shorter in the fentanyl group compared with the sufentanil group (179 minutes vs 211 minutes) is also consistent with other studies in which intrathecal 10 µg fentanyl was added to treatment.13–15,28

In our study, the durations of motor block were found to be shorter than the duration of the sensory block. These results are consistent with other studies in the literature.13,14,21,28

Continuation of postoperative analgesia despite an early end to the motor block significantly extended the time to the first analgesic requirement in the sufentanil group. For spinal anesthesia performed during caesarean sections, Gautier et al24 reported the time to first analgesic requirement as 136 minutes for a 8 mg levobupivacaine plus 2.5 µg sufentanil combination. This duration was longer in our study, and was identified as 219 minutes for the sufentanil group. This difference might be due to the higher dose of levobupivacaine used in our study.

In a study where fentanyl and sufentanil were added to bupivacaine, Dahlgren et al14 reported intraoperative intravenous fentanyl requirement for 1 patient in the 5 µg sufentanil group. In their study where 20 µg fentanyl, 2.5 µg sufentanil, or saline was added to 1.5 to 2.4 mL 0.5% bupivacaine, Lee et al28 reported that intraoperative intravenous fentanyl administration was only required by 22 of 24 patients in the control group. Intraoperative pain and discomfort caused by separation of the rectus muscle and stretching of the peritoneum also necessitated the use of additional analgesia and sedation in our study. During uterus incision and skin closure, 22% of control patients required intravenous fentanyl use. Despite higher VAS values in the sufentanil group that were not statistically significant, 19% of patients required intravenous fentanyl. Intraoperative analgesia was best ensured in the group with fentanyl added to levobupivacaine, with none of the patients requiring any IV fentanyl for intraoperative analgesia. In our study, the requirement for fentanyl and sedation affected anesthesia quality. When fentanyl and propofol use were considered, it was determined that the quality of anesthesia was lowest in the control group, and was highest in the fentanyl group. This is in agreement with the characteristics of the blocks determined in our study, with inadequate block levels in the control group leading to an increase in both fentanyl and propofol use. This also suggests that the intraoperative administration of intravenous fentanyl may have contributed to the sensory block duration and effective postoperative analgesia in the sufentanil group.

Incidence of hypotension in spinal anesthesia procedures during caesarean section surgeries is 45%.12,29 Methods such as fluid loading, having the patient assume a left lateral position, and using vasoconstrictor agents have been recommended for its prevention.12,29,30 Significant levels of hypotension compared with the basal values was observed in all groups at the third minute following the block; such cases were corrected with rapid administration of fluid loading and ephedrine. In their study comparing addition of 5 µg sufentanil and 10 and 20 µg fentanyl to10 mg levobupivacaine and10 mg bupivacaine during spinal anesthesia, Bremeric et al15 reported that the hemodynamic data of both groups were similar, with no differences regarding side effects. Gunusen et al27 demonstrated that the addition of 10 µg fentanyl to 10 mg levobupivacaine increased the incidence of hypotension, whereas lower doses of levobupivacaine led to insufficient anesthesia and analgesia.

In our study, no intergroup differences were observed with regard to intraoperative side effects. Pruritus was significantly more frequent in the sufentanil group during the postoperative period, whereas pruritus did not develop in any control group patients. This demonstrates that the addition of opioids had an effect on pruritus. Incidence of pruritus among pregnant women with various opioids (especially lipophilic opioids) administered intrathecally was reported at between 30% and 95%, although the pruritus was generally transient and mild.11,12,31 In their study performed with varying intrathecal fentanyl doses (5–45 µg), Palmer et al32 described that pruritus was not dose-dependent, and that it was observed in all patients. In certain studies, intrathecal sufentanil increased the incidence of pruritus in a dose-dependent fashion.10,11,14,27,28 In their study adding placebo, 1.5, 2.5, or 5 µg sufentanil to 0.5% hyperbaric bupivacaine during elective caesarean section surgery, Demiraran et al11 reported that the lowest incidence of pruritus was observed in the group with 1.5 µg sufentanil added to their LA. Similarly in our study, the frequency of pruritus increased in the group with 2.5 µg sufentanil combined with their treatment. However, the cases of pruritus were transient, and only 1 patient required treatment.

Best postoperative analgesia in our study was provided by the addition of sufentanil to levobupivacaine, which affected the use of additional analgesics within the postoperative first 24 hours. It has been reported in the literature that intrathecal doses of 2.5 to 5 µg sufentanil reduced the postoperative requirement for analgesia, especially during the first 6 hours.12 Dahlgren et al14 determined in their study a significantly lower use of additional analgesia in the sufentanil group during the first 24 hours (especially during the first 6 hours). Although the additional use of analgesics during the postoperative first 24 hours in our study was significantly lower in the sufentanil group, the use of additional analgesics was highest in the control group.

The addition of intrathecal fentanyl or other opioids to LA administration during caesarean sections did not affect the Apgar scores and newborn blood gas values.10,14,27 There was no direct relationship between the likelihood of hypotension and the Apgar scores. It was emphasized that the depth and duration of hypotension could have a considerable influence on hypotension’s effect on newborns.31 No differences were observed between the Apgar scores and the gas values of the umbilical blood, and fetal acidosis was not seen in any of the groups. This might be associated with the transient nature of the changes in blood pressure, and also its rapid correction.

Surgeon satisfaction score in our study was significantly lower in the control group. However, muscle relaxation at surgery site was generally moderate in the other groups, and considered excellent by only 5 patients. Sufficient muscle relaxation was not achieved in some patients; this adversely affected the quality of anesthesia and surgeon satisfaction. A study published in recent years reported a 50% effective dose of 6.2 mg for levobupivacaine, and a 95% effective dose of 12.9 mg.33 The study described that the addition of 2.5 µg sufentanil to the 95% effective dose did not affect hemodynamics, that sufficient block and effective anesthesia and analgesia were achieved, and that lower doses resulted were not effective. Our results suggest that the administered levobupivacaine doses could have been insufficient.

The limitation of our study is the lack of assesment of patients’ satisfaction levels. This could have let us evaluate the compatibility of patients’ and surgeons’ satisfaction scores about the anesthetic technique.


Our study demonstrated that the addition of sufentanil and fentanyl to intrathecal levobupivacaine during caesarean section surgery is more effective than the administration of levobupivacaine alone. The addition of sufentanil to levobupivacaine allowed rapid onset time for sensory and motor block levels. It also extended the duration of postoperative analgesia, and led to a decrease in total analgesic requirement. However, physicians should keep in mind that it may be insufficient in terms of intraoperative anesthesia quality and sufentanil might invoke perioperative pruritus.


This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial-No Derivative Works License, which permits non-commercial use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Drs. Ozyilkan, Kocum, Sener, Caliskan, Tarim, Ergenoglu, and Aribogan all made significant contributions to the study design, data collection, data interpretation, figure creation, and writing of the manuscript.

Conflicts of interest

The authors have indicated that they have no conflicts of interest regarding the content of this article.

Article Categories:
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Keywords: Key Words caesarean section, fentanyl, levobupivacaine, local anesthetics, spinal anesthesia, sufentanil.

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