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 Table of Contents  
Year : 2018  |  Volume : 8  |  Issue : 2  |  Page : 42-47

Comparing remifentanil, magnesium sulfate, and dexmedetomidine for intraoperative hypotension and bleeding and postoperative recovery in endoscopic sinus surgery and tympanomastoidectomy

1 Department of Anesthesiology and Critical Care, Arak University of Medical Sciences, Arak, Iran
2 School of Medicine, Arak University of Medical Sciences, Arak, Iran
3 Neurology and Neuroscience Research Center, Qom University of Medical Sciences, Qom, Iran

Date of Web Publication3-Jul-2018

Correspondence Address:
Hesameddin Modir
Department of Anesthesiology and Critical Care, Arak University of Medical Sciences, Arak
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Source of Support: The study was supported by a grant from Arak University of Medical Sciences, Iran., Conflict of Interest: None

DOI: 10.4103/2045-9912.235124

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The study aimed to compare remifentanil, magnesium sulfate, and dexmedetomidine for intraoperative hypotension, bleeding volume, and recovery time in endoscopic sinus surgery and tympanomastoidectomy (TM). A double-blind clinical trial enrolled the patients undergoing endoscopic nasal sinus surgery and TM at Amirkabir Hospital (Arak, Iran), who were randomly assigned into three groups dexmedetomidine (DEX), remifentanil (REM), and magnesium sulfate (MgSO4) to which we intravenously administered 1 μg/kg DEX, an intravenous dose of 1 μg/kg REM, and 40 mg/kg of intravenous MgSO4, respectively. The blood loss, blood pressure (BP), heart ratio (HR), oxygen saturation (SaO2), and recovery time were recorded. Significant differences were found statistically in bleeding rates among all groups (P = 0.0001). The least amount of blood loss (very mild bleeding) was observed at 82.85% in the DEX group. BP and HR were lower in this group than those in the other groups. While recovery score was significantly different in the three groups (P = 0.007), the recovery time was the highest in the DEX group, while the least in the REM group. Based on the present results Dexmedetomidine seems to better prevent from bleeding than the others. Moreover, DEX can cause lower BP and HR in subjects with lower propofol administration, but the recovery time is longer. This study was registered by IRCT2017021114056N11 in Iranian Registry Clinical Center.

Keywords: blood loss; Endoscopic; sinus; surgery; dexmedetomidine; magnesium sulfate; remifentanil; tympanomastoidectomy

How to cite this article:
Modir H, Modir A, Rezaei O, Mohammadbeigi A. Comparing remifentanil, magnesium sulfate, and dexmedetomidine for intraoperative hypotension and bleeding and postoperative recovery in endoscopic sinus surgery and tympanomastoidectomy. Med Gas Res 2018;8:42-7

How to cite this URL:
Modir H, Modir A, Rezaei O, Mohammadbeigi A. Comparing remifentanil, magnesium sulfate, and dexmedetomidine for intraoperative hypotension and bleeding and postoperative recovery in endoscopic sinus surgery and tympanomastoidectomy. Med Gas Res [serial online] 2018 [cited 2022 Jan 21];8:42-7. Available from: https://www.medgasres.com/text.asp?2018/8/2/42/235124

  Introduction Top

Functional Endoscopic sinus surgery (FESS) has been employed as a surgical intervention to treat chronic sinusitis in patients with no response to drug therapy,[1] during which the surgical vision may be greatly reduced by a small amount of bleeding.[1],[2] Thereby, the intraoperative controlled hypotension (CH) can improve the visibility. This can, however, cause serious complications in the postoperative period, including eye socket infections, visual acuity damage, meningeal infections, and other cases which develops by excess intraoperative bleeding.[2],[3],[4]

The goal of FESS is to restore drainage and aeration of paranasal sinuses while mucociliary clearance is naturally maintained.[1],[4] During FESS under general anesthesia, a controlled hypotension is provided, which means a deliberate reduction in systolic blood pressure (BP) up to 80-90 mm Hg, an arterial pressure of up to 50-70 mm Hg, or a decrease up to 30% (relative to mean arterial pressure) to keep tissue perfusion. It can provide better surgical condition, reduce the surgery time, improve the postoperative recovery, and reduce the postoperative endoscopic relapse rate.[4],[5],[6] Antihypertensive should ideally include attributes, such as ease of administration, rapid onset and termination of effect, the absence of toxic intermediates produced, minor effect on vital organs, and predictable dose-related effects.[7] Since access to the nasal area is limited, mainly through nostril, and numerous techniques cannot be used to control bleeding in other parts of the body in the surgery, then requiring a method to reduce intraoperative bleeding.[8],[9] Several methods availably used to control intraoperative bleeding include: local vasoconstrictors, antihypertensives, severe carbon dioxide (CO2) control, β-blocker pretreatment, reverse trendelenburg, intravenous and inhalation anesthetics, direct vasodilators (such as nitroglycerin and sodium nitroprusside), α-adrenergic agonists (such as clonidine and dexmedetomidine), calcium channel blockers, prostaglandin E1 (alprostadil) and adenosine, hydralazine, trimethaphan and fenoldopam.[1],[4] Moreover, anesthetics can reduce bleeding and improve the vision of the surgical field by vasodilation and hypotension, among which magnesium sulfate (MgSO4) has been proven to have positive effects on postoperative bleeding control.[7],[8] Magnesium is an N-methyl-D-aspartate (NMDA) receptor antagonist reducing the need for analgesics and sedatives, and competes with calcium in the neural canals, thereby inhibiting the release of acetylcholine (ACh) at the motor end plate.[10] It also acts as a vasodilator by increasing prostacyclin synthesis and by inhibiting the angiotensin-converting enzyme (ACE), while being widely used in patients with preeclampsia and pheochromocytoma.[2],[11]

Dexmedetomidine is a highly selective α2-adrenergic receptor agonist, with sedative, amnestic, and analgesic properties.[12] Moreover, the imidazole agent has a decongestant effect, inducing hypotension during tympanoplasty.[13] An elimination half-life of 2 hours and a distribution half-life of 6 minutes have made it an ideal drug for intravenous infusion. Moreover, this is used in patients undergoing septoplasty under local anesthesia and has been reported to reduce bleeding score.[3],[14] It also reduces both intraoperative and postoperative opioid requirement, and has a sympatholytic effect, decreasing the stress response to surgery and ensuring a stable hemodynamic state, while its central and peripheral sympatholytic performance is mediated by alpha-2 receptor, is manifested by reduced arterial BP, HR, cardiac output, and reduced release of norepinephrine.[3],[14],[15]

With a short-acting μ-opioid agonist, remifentanil has recently been identified as an agent for CH, which is characterized by its fast start and end of an action. When used with propofol or other inhaled anesthetics, it causes CH and improves visualization of the surgical field without affecting the local tissue circulation.[1],[6] Remifentanil by infusion leads hypotension and bradycardia. Little information was found about other hemodynamic variables such as changes in cardiac output, stroke volume, and total peripheral resistance (TPR).

No studies have been conducted on the effects of remifentanil, dexmedetomidine and MgSO4 in producing CH and providing favorable intraoperative conditions through different surgeries. But given that previous studies which examine dexmedetomidine and remifentanil, have achieved different, sometimes conflicting results,[3],[14],[15],[16] the present study aimed to introduce a magnesium sulfate to control intraoperative BP and to obtain recovery discharge criteria, compared with the others. Mainly comparing both in different conditions and surgical procedures, the previous studies did not explore the three anesthetics in a single study; while all were studied in three groups with almost identical conditions under the same procedures in ours work.

  Subjects and Methods Top

A double-blind clinical trial involved the patients undergoing endoscopic nasal sinus surgery and TM at Amirkabir Hospital, after obtaining written consent and verifying inclusion and exclusion criteria. The patients and data collection practitioner did not aware about the treatment allocation. Inclusion criteria: age 18-60, American Society of Anesthesiologists (ASA) I-II[17]; Exclusion criteria: age under 18 or above 50, ASA > II, coagulation disorders, history of cardiovascular and cerebrovascular disease, poor BP control, pregnancy, addiction to opioids, body mass index (BMI) > 35, intraoperative systolic BP < 65 mm Hg, surgical duration less than 30 minutes and more than 160 minutes, the need for intraoperative sympathomimetic drug, and the use of other hypotensive drugs. The sample size calculated by the Cochrane formula with considering α = 0.05 and study power equal 80%. Overall, 130 patients enrolled and after describing the study objectives 105 patients were singed the informed consents and entered in study. The ethical committee of Arak University of Medical Sciences approved this project IR.ARAKMU.REC.1395.359. Moreover, this study registered by IRCT2017021114056N11 in Iranian Registry Clinical Center.

All patients, admitted one day before surgery, were fasting for 8 hours. After demographic data was recorded, two intravenous lines were inserted in different areas on arrival to the operating room, to inject the three drugs studied and intravenous fluids (or other drugs) into the first and second lines, respectively. Before induction, heart ratio (HR), arterial BP and oxygen saturation (SaO2) were measured. Meanwhile, a left radial arterial line was inserted for an accurate estimate of changes in BP/HR of all subjects, while aggressively and instantaneously measuring the patient's BP from the time of induction.

At the start of induction, 5 mg/kg crystalloid fluid was infused and 100% oxygen was administered to patients through the mask for the first 2 minutes. Anesthesia was induced with 1 μg/kg fentanyl and 5 mg/kg nesdonal, and tracheal intubation was performed with 5.0 mg/kg atracurium. Each patient was mechanically ventilated to maintain an exhaled carbon dioxide concentration of 30-35 mm Hg and a SaO2 of more than 95%. The subjects including 105 eligible patients were assigned into three groups by block randomization equally. The Consort chart is depicted in [Figure 1].
Figure 1: The flowchart of patients.

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In the dexmedetomidine group, dexmedetomidine (precede, hospira Co, USA) was administered at 1 mg/kg in 100 mL with normal saline as an initial dose for 10 minutes, followed by 0.4 μg/kg per hour to keep the dose of infusion. In the remifentanil group, remifentanil (ultiva, glaxosmithkline Co., Italy) was intravenously administered at a dose of 1 μg/kg in 100 mL with normal saline for 10 minutes, while the infusion dose was 0.25 μg/kg per minute. With an infusion dose of 10 mg/kg per hour, MgSO4 group was injected with 40 mg/kg of intravenous MgSO4 (Paya Ghasd Darou, Iran) in 100 mL normal saline for 10 minutes before anesthesia induction. Moreover, general anesthesia was maintained with isoflurane (1%) (flurane, Baxter Co., USA).

An intravenous infusion of propofol was commenced at a dose of 50-150 μg/kg per minute in separate IV line after induction to prevent hypertension in all patients and achieve a mean arterial pressure of 65 mm Hg and HR of 75 per minute, while total propofol dose was recorded for each patient. HR, systolic/diastolic BP, and SaO2 were measured and recorded after induction and during the hypotension phase every 10 minutes until the end of surgery. Before the procedure, the surgeon used 3 mL of intradermal injection of lidocaine (2%) with epinephrine 1:200,000 to produce local vasoconstriction in the area of surgery. Based on the satisfaction scoring system of surgeons (0-6), the surgeon which assessed the surgical site for bleeding and rated it was blind on classifications of the study and had no information on anesthesia drug. The system includes: 0 = no bleeding; 1 = very mild bleeding (can be considered dry); 2 = mild bleeding (does not distort the cut area); 3 = moderate bleeding (affects the area); 4 = severe bleeding (can be controlled but destroys it); and 5 = very severe bleeding (cannot be controlled). In the scoring of bleeding, a score of ≤ 2 is favorable for surgical site.

Five minutes before the end of surgery, anesthetic gas was turned off and infusions were stopped. Extubation time was determined based on the good respiration volume and airway reflexes return, and the patient's recovery discharge time was evaluated using Aldrete score, to obtain a score of 9 or higher. This is recorded on the patient's assessment form. Then the patient was transferred to the ward, if scored a 9 or higher. Finally, side effects such as intraoperative hypotension (< 65 mm Hg) and bradycardia (HR < 50/min), and postoperative complications such as nausea and vomiting, muscle stiffness and tremor were recorded. In case of using other antihypertensives, they were recorded on the patient's assessment form, and then the patient was excluded.

Statistical analysis

The data collected were analyzed by Statistical Package for the Social Sciences (SPSS) software version 18.0 (SPSS Inc., Chicago, IL, USA). Descriptive statistics such frequency, mean and standard deviation were used for description of patients. Moreover, Chi Square test used to compare the bleeding severity in three groups. Comparing the hemodynamic variables and recovery score and surgery duration was conducted by analysis of variance and Tukey post hoc tests. Trend of hemodynamic variables during surgery was assessed by analysis of variance with repeated observations were used in analysis.

  Results Top

The mean age of patients was 33.4±6.27 years that varied between 20 to 52 years and 50.5% of patients were male. Three groups including dexmedetomidine, remifentanil and MgSO4 were same regarding to sex and mean of age and showed that the randomization was appropriate (P > 0.05).

The analysis of variance [Table 1] showed that there was no significant difference among studied groups regarding to surgery time (P = 0.402). But a significant difference was observed among three groups in Bleeding score, extubation time, recovery Time, recovery score and Propofol dose (P < 0.05). The Tukey post hoc test showed that the postoperative recovery time and extubation time were higher in dexmedetomidine group than other two groups. Moreover, the bleeding score, recovery score and Propofol dose was significantly lower in Dexmedetomidine group than remifentanil and MgSO4 groups.
Table 1: Comparing the multiple variables among dexmedetomidine, remifentanil and magnesium sulfate groups

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The Chi square test [Table 2] showed a statistically significant difference in bleeding severity among three groups (P < 0.001). The least amount of blood loss (no bleeding and very mild bleeding) was observed in the dexmedetomidine group with 85.7%%. However, the percent of no bleeding and very mild bleeding in remifentanil and MgSO4 groups were 40% and 17.1%, respectively.
Table 2: Comparison of bleeding severity in dexmedetomidine, remifentanil and magnesium sulfate groups

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The analysis of variance showed that there was no difference among three groups regarding to BP immediately after post induction until 60th minutes after post-operative (P > 0.05). However, a significant difference was observed among groups regarding to BP after the first hour to 150th minutes of operation and the BP was significantly lower in dexmedetomidine group than other two groups (P < 0.001). In addition, the repeated measurement analysis of varianceshowed that there was a decreasing trend in mean of BP in all three groups after induction and this trend increased 2 hours after induction. However, the mean of BP in the dexmedetomidine group was lower in the remifentanil and MgSO4 groups [Figure 2].
Figure 2: Comparison of mean of blood pressure (mmHg) in different times after operation in dexmedetomidine, remifentanil and magnesium sulfate groups
Note:Data are expressed as mean and analyzed by analysis of variance. I: Baseline (non-invasive); II: immediately post-induction; III–XVII: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150 minutes post operation.

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As shown in the [Figure 3], a significant difference was observed in the mean of HR among all groups at all times (P < 0.01) from the baseline to 150th minutes after operation. But this difference increased by time. However, the mean of HR was lower than in dexmedetomidine group than remifentanil and MgSO4 groups. Moreover, there was largest difference among groups by increasing time after operation and the HR decrease was more observed in dexmedetomidine group after first hour of post operation, while the highest HR was observed in the MgSO4 group. The repeated measurement analysis of variance did not show significant decreasing trend in all groups.
Figure 3: Comparison of mean of heart rate (beats per minute) in different times after operation in dexmedetomidine, remifentanil and magnesium sulfate groups
Note: Data are expressed as mean and analyzed by repeated measurement analysis of variance. I: Baseline (non-invasive); II: immediately post-induction; III–XVII: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150 minutes post operation.

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The analysis of variance showed that there was no significant difference among three studied groups in SaO2 at all time after operation (P > 0.05), except at 100th, 120th, 130th and 140th minutes after operation that mean of SaO2 was lower in Dexmedetomidine (P < 0.05). Moreover, based on repeated measurement test, there was no significant trend in three studied groups [Table 3].
Table 3: Comparison of mean of oxygen saturation (%) in different times after operation in dexmedetomidine, remifentanil and magnesium sulfate groups

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Adverse effects

According to our results, no significant difference was found in postoperative complications among the groups (P = 0.12). No side effects were observed in the remifentanil group at all, while the most were found in four cases for the dexmedetomidine group, none were seen intraoperatively, and 100% of patients were uncomplicated in the three groups. No significant differences were found statistically in the types of adverse effects in three groups (P = 0.060). However, the most adverse effects were observed in Dexmedetomidine group with 4 cases (11.42%) of drowsiness. For MgSO4, there was one case of lethargy and relaxation, and one case of flaccidity. Antihypertensives were not used for the patients in all groups during surgery.

  Discussion Top

According to our results, significant differences were seen statistically in duration of extubation after induction and recovery score and recovery time in the studied groups. The minimum of blood losing, BP and HR was observed in dexmedetomidine and highest recovery score was observed in MgSO4 group. Moreover, no intraoperative side effect was found, and 100% of patients were uncomplicated in all groups. None were observed postoperatively in the remifentanil group, while the most postoperative ones for the dexmedetomidine group with 4 cases (11.42%) of drowsiness. The extubation time and recovery time were longer in the dexmedetomidine group than the others, while the least recovery time for the remifentanil group.

Srivastava et al study compared the effects of dexmedetomidine and MgSO4 on propofol dose, hemodynamic conditions, and postoperative recovery in patients undergoing spinal surgery, concluding that dexmedetomidine produced better hemodynamic stability than MgSO4, while the duration of recovery and sedation were the same in both groups, compared to those in the control group.[18] In our study, subjects showed lower BP/HR, less bleeding, and longer recovery time in the dexmedetomidine group, probably due to different doses of MgSO4: 40 mg/kg of intravenous MgSO4 prescribed in our study against 50 mg/kg in their study. Comparing the anesthetic use of dexmedetomidine and remifentanil, another study found that control of bleeding, bleeding rates, and quality of surgeon visibility were not significantly different between both groups, showing a longer recovery time in the dexmedetomidine group than the other group and higher sedation score in the group receiving dexmedetomidine at the first hour postoperative.19 Their study results are consistent with ours.

A study conducted by Moshiri et al.[15], which compared between dexmedetomidine and propofol on hypotension and control of bleeding during ESS, concluded that propofol controls HR better than dexmedetomidine. No significant difference was found in BP of the patients and the quality of the surgical field, as the study's main subject.[19] In our comparative study on dexmedetomidine, remifentanil and MgSO4, dexmedetomidine group had better results, while propofol showed better results in Moshiri et al.'s study[19], probably due to a difference in anesthetics compared with dexmedetomidine: MgSO4 and remifentanil in our study vs. propofol in theirs. In a study by Kim et al.[20] on the effect of doses of dexmedetomidine and remifentanil on 43 patients in ESS, they found that continuous intraoperative infusion of the first showed the same view of the surgical site (compared with remifentanil) and that time to extubation was also less in the dexmedetomidine group. However, intraoperative hemodynamic changes in the dexmedetomidine group were similar to those in the remifentanil group, having similar hemodynamic stability and recovery discharge criteria in both.[20] However, our study showed that remifentanil achieved a better combination of mild controlled hypotension with less reduction of BP and HR as well as recovery time and dexmedetomidine produced less blood loss, while lower BP and HR. The results of their study are inconsistent with ours.

Another study compared between dexmedetomidine, MgSO4, and nitroglycerin in producing CH during ESS, concluded that the control can be provided by all drugs, but dexmedetomidine was effective. Moreover, the postoperative analgesia and sedation were induced, in the groups of dexmedetomidine and MgSO4. However, the nitroglycerin group achieved a shorter recovery stay and better discharge criteria than the groups of MgSO4 and dexmedetomidine, while subjects in the MgSO4 group also achieved the criteria.[21] The results of their study were in line with our study. Akkaya et al.[22] compared dexmedetomidine vs. MgSO4 for the quality of visibility in ESS surgery, concluding that dexmedetomidine excursion offers a better visibility of surgical field than MgSO4, and also that dexmedetomidine is a good alternative to MgSO4, since it has a higher reducing effects on bleeding in the surgical field and substantially suppresses HR, as compared with MgSO4. Moreover, they introduced dexmedetomidine as an alternative to MgSO4, due to its shorter duration of surgery.[22] Though our findings are consistent with them, MgSO4, remifentanil, and dexmedetomidine did not vary the duration of surgery in our study.

Comparison of the efficacy of MgSO4 and dexmedetomidine in producing CH in FESS surgeries, showed that the second produced a better hypotension than the other, and provided a higher surgeon satisfaction, and a shorter time to meet recovery discharge criteria for the dexmedetomidine group.[23] The results of their study were consistent in producing hypotension, but the time needed to achieve the criteria was higher in the dexmedetomidine group. Kahveci et al.[24] compared MgSO4 and remifentanil to provide CH in middle ear surgery and concluded that remifentanil produces better CH and surgical conditions for middle ear surgery, as compared with magnesium. The results were consistent with ours.

In another study for comparing dexmedetomidine versus remifentanil for CH during ESS, they concluded that both produce safe and acceptable hypotension, but recovery time of patients in the dexmedetomidine group was longer than the remifentanil group.[25] In our study, dexmedetomidine had a better effect on bleeding control than remifentanil and MgSO4, but with a longer recovery period. The difference could be attributed to different doses: 1 μg/kg dexmedetomidine and 1 μg/kg of intravenous remifentanil in our study vs. 0.25 μg/kg/h remifentanil and 0.2 to 0.7 μg/kg/min dexmedetomidine in theirs. Aboushanab et al.[26] compared the efficacy of dexmedetomidine and MgSO4 for CH during middle ear surgery and concluded that both had successful CH, but the subjects in the group of MgSO4 had a lower recovery discharge time and significantly longer recovery time than those in the group of dexmedetomidine,[26] which our results were consistent with theirs. A study by Ryu et al.[27] concluded that both can provide adequate CH and proper conditions in surgical field and that patients receiving MgSO4 had postoperative conditions, postoperative pain and postoperative nausea and vomiting,, while remifentanil in our study manifested less blood loss than MgSO4. The difference can be attributed to the difference in the type of surgery performed.

Richa et al.'s study[28] on comparison between dexmedetomidine and remifentanil for CH during tympanoplasty concluded that infusion of 0.4-0.8 μg/kg dexmedetomidine in their study, was less effective in producing CH, creating an appropriate surgical field exposure condition, and lowering the surgeons' satisfaction, as compared with remifentanil, hypotension, while dexmedetomidine was better in our study. The different results can be attributed to different doses of dexmedetomidine: 1 μg/kg in our study vs. 0.4-0.8 μg/kg in theirs. Eghbal et al.'s study[6] on the comparison of dexmedetomidine and labetalol in controlling bleeding during ESS, showed that a better visibility of the surgical field was seen in the group receiving labetalol than who received dexmedetomidine, and the time required for extubation of patients and the length of time required for recovery was lower in subjects in the labetalol group. Overall, they concluded that labetalol was effective than dexmedetomidine. The results of their study are inconsistent with ours, probably due to the difference in the drugs compared in both studies, but since the patients in the dexmedetomidine group had a longer recovery time than the other group, the Eghbal et al findings are in line with our study.

Regarding the results, the reduced BP/HR, blood losing and the overall amount of propofol administered during surgery in the DEX group when compared to the other groups, DEX seems to be an effective choice if no high sensitivity was observed to the longer postoperative recovery time. A comparison is recommended between other antihypertensive and anti-nausea and vomiting drugs in other bleeding surgeries, while performing this in other age groups with a larger sample size to introduce and select the safest preferred drug to control intraoperative bleeding.

  References Top

Moshiri E, Modir H, Yazdi B, Susanabadi A, Salehjafari N. Comparison of the effects of propofol and dexmedetomidine on controlled hypotension and bleeding during endoscopic sinus surgery. Ann Trop Med Public Health. 2017;10:721-725.  Back to cited text no. 1
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Moshiri E, Modir H, Bagheri N, Mohammadbeigi A, Jamilian H, Eshrati B. Premedication effect of dexmedetomidine and alfentanil on seizure time, recovery duration, and hemodynamic responses in electroconvulsive therapy. Ann Card Anaesth. 2016;19:263-268.  Back to cited text no. 15
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Karabayirli S, Ugur KS, Demircioglu RI, et al. Surgical conditions during FESS; comparison of dexmedetomidine and remifentanil. Eur Arch Otorhinolaryngol. 2017;274:239-245.  Back to cited text no. 19
Kim H, Ha SH, Kim CH, Lee SH, Choi SH. Efficacy of intraoperative dexmedetomidine infusion on visualization of the surgical field in endoscopic sinus surgery. Korean J Anesthesiol. 2015;68:449-454.  Back to cited text no. 20
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Richa F, Yazigi A, Sleilaty G, Yazbeck P. Comparison between dexmedetomidine and remifentanil for controlled hypotension during tympanoplasty. Eur J Anaesthesiol. 2008;25:369-374.  Back to cited text no. 28

Author contributions
HM: Contributions to the conception or design of the interpretation of data for the work; and final approval of the article. AM: Contributions to the conception or design of the work and final approval of the article. OR: Contributions the acquisition and analysis of data for the work and drafting the article. AM: Contributions to the conception or design of the work analysis, or interpretation of data for the work; and final approval of the article.
Conflicts of interest
There is no conflict of interest.
Financial support
The study was supported by a grant from Arak University of Medical Sciences, Iran.
Research ethics: The study was approved by the ethical committee of Arak University of Medical Sciences ( approved No. IR.ARAKMU.REC.1395.359).
Declaration of patient consent
The authors certify that they have obtained patient consent forms. In the form, patients have given their consent for their images and other clinical information to be reported in the journal. The patients understand that their names and initials not be published and due efforts will be made to conceal their identity, but anonymity cannot be guaranteed.
Data sharing statement
Datasets analyzed during the current study are available from the corresponding author on reasonable request.
Plagiarism check
Checked twice by iThenticate.
Peer review
Externally peer reviewed.
Open peer review report
Reviewer: Wen-Wu Liu, Secondary Military Medical University, China.
Comments to author: In this paper, the authors reported two cases of tick bite cellulitis which was successfully treated with ozone. There were some problems in this case report that should be resolved before publication.
Funding: The study was supported by a grant from Arak University of Medical Sciences, Iran.


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