COMPARISON OF DEXMEDETOMIDINE AND FENTANYL ON AIRWAY RESPONSE AND HEMODYNAMICS DURING TRACHEAL EXTUBATION

Background: Extubation is associated with various circulatory and airway responses. Various pharmacological measures including fentanyl and dexmedetomidine have been used to blunt the reflex without compromising the spontaneous respiration. In this study we wanted to compare dexmedetomidine and fentanyl on airway response, smoothness of extubation and hemodynamic changes. Methodology: A total of 68 patients undergoing surgery under general anesthesia with endotracheal intubation, were randomized into two groups. Group A received dexmedetomidine 0.5 mcg/kg and Group B received 1 mcg/kg of fentanyl with the start of skin suturing over a period of 10 minutes via syringe pump. Airway reflex during suction and smoothness of extubation were assessed. Level of sedation during suction, extubation and then every 5 minutes post extubation for 15 minutes were recorded. Hemodynamic parameters were assessed every 5 minutes with start of test solution till extubation and then every 5 minutes for 15 minutes. Results: A total of 68 patients were evaluated in the study. In dexmedetomidine group, 67.6% of patients had no cough on extubation while in fentanyl group 35.3% of patients had no cough on extubation which was statistically significant (p value 0.015). Mean heart rate during extubation increased in both the groups but the increase was 39% in Group B and 11% in Group A from baseline which was statistically significant (p value < 0.001). There was rise in mean systolic and mean arterial pressure during extubation in both the groups but the increase was significantly higher in fentanyl group. Patients in dexmedetomidine group were more sedated but there were no any adverse events. Conclusion: With the results obtained from the study, it is concluded that dexmedetomidine 0.5 mcg/kg over 10 minutes before extubation is effective in alleviating airway response and haemodynamics compared to fentanyl 1 mcg/kg.

Amygdala Metabotropic Glutamate Receptor 1 Influences Synaptic Transmission To Participate In Fentanyl-Induced Hyperalgesia In Rats

The underlying mechanisms of opioid-induced hyperalgesia (OIH) remain unclear. Herein, we found that the protein expression of metabotropic glutamate receptor 1 (mGluR1) was significantly increased in the right, but not in the left laterocapsular division of central nucleus of the amygdala (CeLC) in OIH rats. In CeLC neurons, the frequency and the amplitude of mini-excitatory postsynaptic currents (mEPSCs) were significantly increased in fentanyl group which were decreased by acute application of a mGluR1 antagonist, A841720. Finally, the behavioral hypersensitivity could be reversed by A841720 microinjection into the right CeLC. These results show that the right CeLC mGluR1 is an important factor associated with OIH that enhances synaptic transmission and could be a potential drug target to alleviate fentanyl-induced hyperalgesia.

A comparative study of hemodynamic changes in dexmedetomidine versus midazolam and fentanyl combination during awake fibreoptic intubation

Background: The hemodynamic changes during awake fibreoptic intubation (AFOI) are attributed to patient’s anxiety, poor topicalization of the airway, excessive sedation, lack of expertise, pain, prolonged time to intubation, stimulation of oropharyngeal structures, and jaw thrust to aid intubation. In this study, we compared hemodynamic changes of dexmedetomidine (DEX) with midazolam (MDZ) and fentanyl during AFOI. Aims and Objectives: The objective of the study is to compare the hemodynamic changes in DEX alone versus fentanyl- MDZ combination during AFOI. Materials and Methods: Group-I patients (n=30) received DEX 1 μg/kg bolus infusion over 10 min, followed by infusion of 0.1 μg/kg/h titrated to 0.7 μg/kg/h whereas Group-II patients (n=30) received iv fentanyl 2 μg/kg bolus followed by MDZ infusion of 0.02–0.1 mg/kg/h until they were adequately sedated, i.e. Ramsay Sedation Score (RSS) of 3. Hemodynamics including heart rate (HR), systolic blood pressure (SBP), diastolic blood pressure (DBP), oxygen saturation (SpO2) were recorded when patient is sedated, i.e. at RSS-3, every min of fibrescopy till 5 min and at intubation and every 3rd min post-intubation till 30 min. Results: Measurements of the HRs in the two groups showed significant differences between the two groups at RSS-3, during FOS and post-intubation with the DEX group showing lower mean HRs compared with the MDZ and fentanyl group. SBP and DBP showed a fall in both the groups as compared with the baseline at RSS-3, during FOS and post-intubation; however, no significant differences were noted between the two groups. The mean SpO2values show significant difference between the two groups. (P<0.05) at RSS-3, FOS, post intubation upto 18 min (P<0.05). Conclusion: The use of DEX at 1 mcg/kg bolus slowly over 10 min, with maintenance rates of 0.1–0.7 μg/kg/h, is safe and beneficial for patients undergoing AFOI. Thus, DEX acts like an ideal drug for AFOI. It provides excellent intubating conditions without significant hemodynamic perturbations and risk of hypoxia.

Effect of Fentanyl Infusion on Heart Rate Variability and Anaesthetic Requirements in Isoflurane-Anaesthetized Horses

Controversy continues to surround the use of opioids in equine anaesthesia, with variable effects reported. This blinded clinical study aimed to investigate the influence of a low-dose fentanyl continuous rate infusion (CRI) on isoflurane requirements, parasympathetic tone activity (PTA), and anaesthetic parameters in horses during general anaesthesia. All of the twenty-two horses included in the research underwent a standard anaesthetic protocol. Eleven horses in the fentanyl group (Group F) received a loading dose of fentanyl at 6 µg/kg, followed by a CRI of 0.1 µg/kg/min during anaesthesia. A further 11 horses in the control group (Group C) received equivalent volumes of normal saline. Anaesthetic parameters and PTA index were recorded during anaesthesia. The achieved mean fentanyl plasma concentration was 6.2 ± 0.83 ng/mL. No statistically significant differences between groups were found in isoflurane requirements, MAP values, and mean dobutamine requirements. However, horses in Group F required a significantly lower dose of additional ketamine to maintain a sufficient depth of anaesthesia. Significantly higher PTA values were found in the fentanyl group. Further research is warranted to determine the limitations of PTA monitoring, and the influence of various anaesthetics on its values.

Effectiveness of Intrathecal Administration of Bupivacaine with Fentanyl versus Nalbuphine for Elective Cesarean Section

Background Spinal anesthesia is the most popular procedure in the field of anesthesiology. Subarachnoid block is the preferred anesthetic technique for cesarean section, being simple to perform and economical with rapid onset. Lower incidence of failed block, less drug doses, minimal neonatal depression and decreased incidence of aspiration pneumonitis are added advantages of spinal anesthesia. Objectives The study aims to compare the postoperative analgesic efficacy of Fentanyl versus Nalbuphine when used with intrathecal injection of 0.5% hyperbaric bupivacaine in spinal anesthesia in patients undergoing cesarean section as the primary objective and compare intraoperative hemodynamic changes and postoperative pruritus and shivering as the secondary objectives. Methods and material After Approval was obtained from the research ethics committee of faculty of medicine, Ain Shams University and after obtaining a written informed consent. Fifty adult females underwent elective cesarean section with spinal anesthesia, their ages ranged between 18-45 years old and classified as ASA I and II were enrolled in the study at obstetrics and gynecology Ain Shams university hospital over 4 months. The patients were randomly divided using computer generated randomization into two groups 25patients in each (n = 25), Group A received intrathecal injection of 2 ml of 0.5% hyperbaric bupivacaine plus 0.5 ml fentanyl (25 μg); Group B received intrathecal injection of 2 ml of 0.5% hyperbaric bupivacaine plus 0.5 ml nalbuphine (0.8 mg) Results The main significant findings in this study was that fentanyl has a more rapid onset of motor block (5.63±0.25 minute in fentanyl group versus 5.88±0.19 minute in nalbuphine group), while nalbuphine produces less perioperative side effects as: shivering (7 patients in fentanyl group versus 1 patient in nalbuphine group), pruritis (6 patients in fentanyl group versus 1 patient in nalbuphine group), nausea and vomiting (5 patients in fentanyl group versus 1 patient in nalbuphine group). Regarding perioperative hemodynamic parameters and postoperative analgesia, they were comparable between the 2 groups. Conclusions We concluded that either intrathecal nalbuphine (0.8 mg) combined with (10 mg) Bupivacaine or intrathecal fentanyl (25 µg) combined with (10 mg) Bupivacaine improves intraoperative analgesia and prolongs early postoperative analgesia in cesarean section with significantly lower incidence of side effects as shivering, pruritis, nausea and vomiting in Nalbuphine.

Effect of Adding Magnesium Sulphate to Epidural Bupivacaine Compared to Addition of Fentanyl in Patients undergoing Lower Limb Orthopedic Surgery under Combined Spinal Epidural Anathesia

Background The use of opioids in intrathecal or epidural anesthesia has become popular to optimize postoperative analgesia. However, opioid-induced side effects, such as respiratory depression, nausea, vomiting, urinary retention and pruritus, limit their use. Objectives The purpose of this study was to assess the postoperative analgesic requirements and the analgesic effect of adding magnesium sulphate to epidural bupivacaine compared to addition of fentanyl in patients undergoing lower limb orthopedic surgery under combined spinal epidural anathesia. Patients and Methods After approval of ethical committee in our study and obtaining written informed consent from eligible patients the study was conducted on 60 patients classified to ASA I and II scheduled for lower limb orthopedic surgery. The study presents double armed randomized interventional prospective study including patients allocated into two equal groups each consists of 30 patients. Group (A): patients received magnesium sulphate added to bupivacaine in epidural, Group (B): patients received fentanyl added to bupivacaine in epidural Results The results of their study showed that the maximum level of sensory blockade was significantly higher in the combined fentanyl with magnesium group as compared with fentanyl group alone and magnesium sulphate group alone. The duration of sensory blockade of the combined fentanyl and magnesium group was significantly prolonged as compared to the other two groups as for the other two group the difference in the blockade duration was insignificant Conclusion We concluded that either magnesium sulfate (75 mg) combined with (10 ml) 0.25% Bupivacaine or fentanyl (1 µg/kg) combined with (10 ml) 0.25% Bupivacaine in combined spinal epidural improves intraoperative analgesia and prolongs early postoperative analgesia in lower limb orthopedic surgeries. The duration of analgesia was more prolonged in magnesium sulphate group than in the fentanyl group and this difference was statistically significant.

A Comparative Study between Intrathecal Fentanyl and Dexmedetomidine as Adjuvants to Hyperbaric Levobupivacaine 0.5% in Patients Undergoing Infra Umbilical Surgeries

Background Spinal anesthesia is a common technique for lower abdomen and lower limb surgery, but the use of local anesthetics alone may produce unwanted side effects such as prolonged motor and autonomic block, limited duration of action, besides, excessive local anesthetics can cause cardiac toxicity and central nervous system side effects. For these reasons, local anesthetics combined with other drugs, to utilize their synergistic analgesia and to reduce the dose of local anesthetics, has become a new option for anesthesiologists. Objectives This study is designed to assess and compare the effect of intrathecal Fentanyl and Dexmedetomidine as adjuvants to hyperbaric Levobupivacaine 0.5% regarding the onset, duration of sensory and motor block, duration of post operative analgesia and possible side effects in patients undergoing infra umbilical surgeries. Materials and Methods The study was performed at Ain Shams university hospitals. After obtaining ethical committee approval and informed consent from the patients. The study protocol was obtaining an informed consent; 75 patients admitted for infraumbilical surgeries in Ain Shams University hospitals operation theatre, were blindly randomized into three groups, using their medical record number (MRN) and subjected to a comparative study. A for Fentanyl group, group B for Dexmedetomidine group and group C for Levobupivacaine control group in the duration of 6 months from March to August 2019. Results The study showed that the quality of intraoperative analgesia was significantly better with dexmedetomidine than fentanyl group, and the requirement for opioids was significantly lower with dexmedetomidine than fentanyl group. The degree of motor block and postoperative analgesia was significantly denser with dexmedetomidine than fentanyl group. Conclusion From the current study we can conclude that using intrathecal 5 µg dexmedetomidine seems to be a suitable alternative to 25 µg fentanyl as adjuvants to 0.5% hyperbaric levobupivacaine in spinal anaesthesia. Its associated with prolonged motor and sensory block and provides good quality of intraoperative analgesia and extended duration of post operative analgesia as compared to fentanyl.

Comparative Study Between Bupivacaine 0.5% Versus Bupivacaine 0.5% with Fentanyl in TAP Block for Post-Operative Analgesia After Appendectomy

Background Post operative pain and stress is a very known complication of many surgical procedures which represents a burden for the patient and associated with many complications including stress, myocardial ischemia, prolonged hospital stay and the need of extensive post operative analgesia. Objective to compare the effectiveness of US guided TAP block using 0.5% bupivacaine versus 0.5% bupivacaine with Fentanyl for postoperative analgesia in patients undergoing appendectomy. Patients and Methods After ethical committee approval and informed consent from the patients, this prospective randomized control study, randomization done by closed envelope method & was performed on total 60 patients who underwent surgical appendectomy in Ain Shams University hospitals for 3 months from January to March 2019. Results In our study, 60 patients were randomly divided into 2 equal groups. Control group received bupivacaine only while the fentanyl group in which 50 ug of fentanyl were added to bupivacaine. All patients received equal volumes. Our study showed that addition of a 50 microgram of fentanyl to bupivacaine in ultrasound-guided TAP block has statistically significant effect on the onset of sensory block and prolonged the duration of the sensory block. In addition, fentanyl prolonged the duration of analgesia significantly, as proved by the time of request of first analgesia. Moreover, in fentanyl group, postoperative analgesic requirements were greatly lesser than that of bupivacaine groups. Addition of fentanyl also did not affect the hemodynamics to a significant level. This makes fentanyl with bupivacaine more superior than the use of bupivacaine alone. Conclusion Fentanyl as an adjuvant to bupivacaine in Ultra-sound guided TAP block reduced post-operative pain scores, porolonged the duration of analgesia and decreased demand for rescue analgesics.

Intrathecal Nalbuphine versus Intrathecal fentanyl as adjuvant to 0.5% bupivacaine for caesarian section surgery under subarachnoid block

Background One of the main objectives of anesthesia is to relieve the patient’s pain and agony, by ensuring the performance of surgical procedures without any discomfort. Elimination of postoperative pain is indispensable due to the central, peripheral and immunological stress response to tissue injury. So there is a need for extended analgesia without any side effects to achieve this goal. Aim of the Work To compare the post-operative analgesic effect of intrathecal-nalbuphine and fentanyl as adjuvant to bupivacaine during cesarean delivery. The secondary aim is to compare side effects between using nalbuphine and fentanyl as adjuvants to bupivacaine. Patients and Methods After Approval is obtained from the research Medical Ethical Committee of Faculty of Medicine, Ain Shams University. The study was conducted on 60 patients that were randomly selected. Randomly divided into 2 groups 30 patients each. Group F which received fentanyl as adjuvant while group N received nalbuphine as adjuvant. Results The addition of a small dose of nalbuphine or fentanyl to bupivacaine in spinal anesthesia prolonged the time of postoperative analgesia. In this study, there was no significant difference regarding the age, height, weight, and duration of operation, maximum sensory level, and maximum motor blockade level. The duration of the postoperative analgesia was prolonged with Nalbuphine group in comparison to the fentanyl group, the results were highly significant. Conclusion We concluded that either intrathecal nalbuphine (0.8 mg) or intrathecal fentanyl (25 µg) combined with Bupivacaine improves intraoperative analgesia and prolongs early post-operative analgesia in cesarean section. There was no significant difference with regard to: Peak sensory block level, Maximum motor block level, systolic blood pressure, diastolic blood pressure, oxygen saturation, and heart rate.

COMPARATIVE ASSESSMENT OF HEMODYNAMIC PARAMETERS DURING LAPAROSCOPY IN DEXMEDETOMIDINE VERSUS FENTANYL TREATED PATIENTS.

Background: Laparoscopic surgery is preferred for its advantages in shorter hospital stay, less amount of blood loss and aesthetic incisions. The problems are however evident when the complications of hemodynamic disturbances are enhanced due to pneumoperitoneum. Several newer formulations have ben tried to overcome this problem so that issues of hemodynamic stability can be addressed. Aim: The present study aims to comparatively evaluate the hemodynamic effects of dexmedetomidine and fentanyl in subjects undergoing elective laparoscopic surgeries. Methodology: The study involved a subject pool of 60 patients who were divided equally in two groups and administered the study drugs. Parameters of hemodynamic stability were recorded and analysed to ascertain comparative efficacy. Observations: The mean HR, SBP, DBP, MAP and sedation score were better in dexmedetomidine group as compared to fentanyl group. Conclusion: Dexmedetomidine is an effective adjuvant to anaesthetic medications in laparoscopic surgeries with a disadvantage of longer surgery duration as compared to fentanyl. Keywords: Dexmedetomidine, Comparative evaluation, fentanyl, Laparoscopic surgeries