Dose Of Remifentanil Research Articles

Regulatory effects of propofol on high-dose remifentanil-induced hyperalgesia.

We aimed to evaluate the regulatory effects of propofol on high-dose remifentanil-induced hyperalgesia. A total of 180 patients receiving laparoscopic cholecystectomy were randomly divided into sevoflurane + high-dose remifentanil (SH) group, sevoflurane + low-dose remifentanil (SL) group and propofol + high-dose remifentanil group (PH) group (n=60). After intravenous administration of midazolam, SH and SL groups were induced with sevoflurane and remifentanil, and PH group was induced with propofol and remifentanil. During anesthesia maintenance, SH and SL groups were given 0.3 microg/kg/min and 0.1 microg/kg/min sevoflurane and remifentanil respectively, and PH group was given 0.3 microg/kg/min propofol and remifentanil. The three groups had significantly different awakening time, extubation time and total dose of remifentanil (P<0.001). Compared with SL group, periumbilical mechanical pain thresholds 6 h and 24 h after surgery significantly decreased in SH group (P<0.05), and the visual analog scale (VAS) scores significantly increased 30 min, 2 h and 6 h after surgery (P<0.05). Compared with SH group, periumbilical mechanical thresholds 6 h and 24 h after surgery were significantly higher in PH group (P<0.05), and VAS scores 30 min, 2 h and 6 h after surgery were significantly lower (P<0.05). PH group first used patient-controlled intravenous analgesia pump significantly later than SL group did (P<0.05). The total consumptions of sufentanil in PH and SL groups were significantly lower than that of SH group (P<0.05). The incidence rates of bradycardia and postoperative chill in PH and SH groups were significantly higher than those of SL group (P<0.05). Anesthesia by infusion of high-dose remifentanil plus sevoflurane caused postoperative hyperalgesia which was relieved through intravenous anesthesia with propofol.

Effect of perioperative intravenous lidocaine infusion on postoperative early recovery quality in patients undergoing upper airway surgery

Objective To investigate the effect of perioperative intravenous lidocaine infusion on postoperative early recovery quality in patients undergoing upper airway surgery. Methods One hundred and twenty patients undergoing upper airway surgery were divided into two groups according to a random number table: a lidocaine group (group L) and a control group (group C), with 60 patients in each group. Group L was administered with 2.0 mg/kg lidocaine over 10 min before induction of anesthesia, followed by intravenous infusion at 2 mg·kg-1· h-1 until the end of surgery. Group C was given the same volume of normal saline. The 40-item Quality of Recovery Score (QoR-40 score) as well as the consumption of sufentanil and remifentanil during surgery and the incidence of postoperative nausea and vomiting (PONV) were recorded before surgery (T0), 24 h after surgery (T1) and 48 h after surgery (T2). Results The global QoR-40 scores and the scores for physical comfort, physical independence, psychological support and pain at T1 and T2 in two groups as well as the score for emotional state at T1 in group C were significantly lower than those at T0 (P<0.05). Compared with those in group C, the global QoR-40 scores and the scores for physical comfort, emotional state, and pain significantly increased in group L at T1 and T2 (P<0.05), where the score for physical independence in group L was superior to that in group C at T1 (P<0.05). Compared with those in group C, the dosage of remifentanil used during surgery and the incidence of PONV within 48 h in group L significantly reduced (P<0.05). Conclusions Perioperative intravenous lidocaine infusion can improve QoR-40 scores in patients two days after upper airway surgery, reduce the dosage of opioids and the incidence of PONV and improve postoperative early recovery quality. Key words: Lidocaine; Upper airway surgery; 40-item Quality of Recovery Score; Postoperative nausea and vomiting

Effect of remifentanil on intraoperative fluid balance: a retrospective statistical examination of factors contributing to fluid balance

BackgroundPostoperative fluid retention is a factor that causes delay in recovery and unexpected adverse events. It is important to prevent intraoperative fluid retention, which is putatively caused by intraoperative release of stress hormones, such as ADH (anti-diuretic hormone) or others. We hypothesized that intraoperative analgesia may prevent pathological fluid retention. We retrospectively explored the relationship between analgesics and in-out balance in surgical patients from anesthesia records.MethodsAnesthetic records of 80 patients who had undergone orthognathic surgery were checked in this study. Patients were anesthetized with either TIVA (propofol and remifentanil) or inhalational anesthesia (sevoflurane and remifentanil). During surgery, acetated Ringer's solution was infused for maintenance at a rate of 3–5 ml/kg/h at the discretion of the anesthetist. The perioperative parameters, including the amount of crystalloid and colloid infused, and the amount of urine and bleeding were checked. Furthermore, we checked the amount and administration rate of remifentanil during the surgical procedure. The correlation coefficient between the remifentanil dose and the in-out balance or the urinary output was analyzed using the Pearson correlation coefficient. The contributing factor to fluid retention, including urinary output, was statistically examined by means of multivariate logistic regression analysis.ResultsA significant positive correlation was found between remifentanil dose and urinary output. Urinary output less than 0.04 ml/kg/min was suggested to cause positive fluid balance. Although in-out balance approaches zero balance with increase in remifentanil administration rate, no contributing factor for near-zero fluid balance was statistically picked up. The remifentanil administration rate was statistically picked up as the significant factor for higher urinary output (> 0.04 ml/kg/min) (OR, 2,644; 95% CI, 3.2–2.2 × 106) among perioperative parameters.ConclusionsIn conclusion, remifentanil contributes in maintaining the urinary output during general anesthesia. Although further prospective study is needed to confirm this hypothesis, it was suggested that fluid retention could be avoided through suppressing intraoperative stress response by means of appropriate maintenance of remifentanil infusion rate.

Bilateral Sanyinjiao acupuncture reduces the dose of intravenous remifentanil in labor analgesia

This study aims to evaluate the effects of intravenous analgesia using remifentanil combined with Sanyinjiao acupuncture in childbirth. A total of 150 women who delivered their babies naturally were selected. Among these, 100 women willing to undergo labor analgesia and were full-term and with single child, cephalic presentation, and without pregnancy complications were randomly divided into an intravenous injection group (IV) and a combined injection group (CI), while the remainder comprised the control group (C). After the patients entered the active phase of labor, remifentanil was intravenously infused. Patients in group CI were injected with 2 ml of 1% lidocaine into the bilateral Sanyinjiao acupoint. After analgesia began, pain score, mean arterial pressure, and heart rate in group IV and group CI were significantly lower than in group C (p &lt; 0.05). The dose of remifentanil was significantly lower in group CI than in group IV (p &lt; 0.05); however, there was no significant difference in the duration of labor and neonatal score among the three groups (p &gt; 0.05). Neither excessive sedation nor respiratory depression occurred. Sanyinjiao acupoint injection combined with intravenous infusion of remifentanil reduced the amount of opioids and the risk for serious adverse reactions.

The role of opioids in cancer progression.

The role of opioids in cancer progression.

Dysmenorrhea is associated with a higher incidence of pain after diagnostic hysteroscopy or treatment

Purpose: The purpose of this study was to evaluate whether dysmenorrhea could predict the occurrence of pain perceived after diagnostic hysteroscopy or treatment. Methods: 58 women undergoing diagnostic hysteroscopy or treatment were divided into two groups: patients with dysmenorrhea (Group A) and patients without dysmenorrhea (Group B). Patients underwent routine monitoring after the administration of 7.5 µg of sufentanil by intravenous injection. Propofol infusion was initiated by using a target-controlled infusion pump with concentration initially set at 2 µg/mL in order to maintain a bispectral index monitor (BIS) of 60 to 80. Remifentanil was administered as continuous infusion at 0.05 µg/kg per minute. The total dose of propofol and remifentanil utilized during the procedure was calculated. Results: There were no differences in the characteristics of patients in either group. Multivariate analysis revealed that the presence of dysmenorrhea was significantly correlated with pain (P &lt; 0.05) following the procedure. Conclusion: Dysmenorrhea is associated with a higher incidence of pain after diagnostic hysteroscopy.

Comparison of fentanil and remifentanil for coronary artery surgery with low ejection fraction.

IntroductionIn this study, we evaluated patient response and haemodynamic parameters in patients with low ejection fraction undergoing coronary bypass surgery with either fentanil or remifentanil in conjunction with etomidate.Material and methodsWe evaluated 30 cases of coronary artery surgery, which were divided into two treatment groups (n = 15 each). In group F (fentanil group), the following regimen was employed for anaesthesia induction: 1 mg/kg lidocaine, 0.3 mg/kg etomidate, and, following a 1 µg/kg 60 s bolus dose of fentanil, a 0.1 µg/kg/min fentanil infusion was initiated, after which 0.6 mg/kg rocuronium was administered. In group R (remifentanil group), the following regimen was employed for anaesthesia induction: 1 mg/kg lidocaine, 0.3 mg/kg etomidate and, following a 1 µg/kg 60 s bolus dose of remifentanil, a 0.1 µg/kg/min remifentanil infusion was initiated, after which 0.6 mg/kg rocuronium was administered. Systolic artery pressure, diastolic artery pressure, mean arterial pressure, heart rate, SPO2 (saturation), cardiac output, stroke volume variance, central venous pressure, and systemic vascular resistance values were recorded for all study patients at five minutes before anaesthetic induction (T1), immediately following induction (T2), and immediately following intubation (T3).ResultsThe demographic values obtained for both groups were similar. We found that remifentanil use was associated with decreased cardiac output and increased fluctuations in both heart rate and mean values of arterial pressure.ConclusionsAlthough many studies have demonstrated remifentanil to be as safe as fentanil when titrated to an appropriate dose, our study suggests that fentanil may be a more appropriate choice during the induction of anaesthesia in patients with a low ejection fraction.

Effect of acupoint stimulation on the quality of recovery in patients with radical thyroidectomy under the concept of enhanced recovery after surgery: a randomized controlled trial

To observe the effect of acupoint stimulation on the quality of recovery in patients with radical thyroidectomy under the concept of enhanced recovery after surgery (ERAS). A total of 62 patients with radical thyroidectomy were randomized into an observation group and a control group, 31 cases in each one. In both of the two groups, general anesthesia with tracheal intubation was applied, the same anesthesia induction and maintenance medication were given. In the observation group, auricular point pressing with magnetic beads was adopted at bilateral shenmen (TF4) and transcutaneous electrical acupoint stimulation (dilatational wave, 2 Hz/100 Hz in frequency, 6 to 12 mA) was performed at bilateral Hegu (LI 4) and Neiguan (PC 6) from 30 min before anesthesia induction to the end of the anesthesia. In the control group, medical adhesive plaster was pasted at bilateral shenmen (TF4) and the electrodes were plastered at bilateral Hegu (LI 4) and Neiguan (PC 6) with no corresponding stimulation. In both of the two groups, visual analogue scale for anxiety (VAS-A) score was observed to evaluate the anxiety severity before anesthesia induction; the total intraoperative dosages of sufentanil, remifentanil and propofol were recorded; the numerical rating scale (NRS) score was used to assess the pain severity of instant time (T0) and 30 min (T1) of entering post-anesthesia recovery room (PACU), motor and static mode at 2 h (T2), 6 h (T3), 12 h (T4), 24 h (T5) after surgery; time of first anal exhaust, time of getting out of bed after surgery, total hospitalization time and the incidences of postoperative nausea and vomiting were observed; the quality of recovery was assessed by the 40-item quality of recovery score (QoR-40). The VAS-A score and the total intraoperative dosage of remifentanil in the observation group were reduced compared with the control group (P<0.05). The NRS scores at T0-T4 in the observation group were lower than those in the control group (P<0.01, P<0.05), while the difference between the two groups in NRS score at T5 was not significant (P>0.05). The time of first anal exhaust and getting out of bed after surgery in the observation group were advanced than those in the control group (P<0.05), there was no significant difference between the two groups in total hospitalization time and incidences of postoperative nausea and vomiting (P>0.05). Compared with the control group, the QoR-40 score was increased in the observation group (P<0.05). Acupoint stimulation can improve the preoperative anxiety in patients with radical thyroidectomy, reduce the intraoperative anesthetic dosage and postoperative pain, advance the time of anal exhaust and getting out of bed, improve the quality of postoperative recovery and enhance the recovery process.

Effects of different doses of magnesium sulfate on pneumoperitoneum-related hemodynamic changes in patients undergoing gastrointestinal laparoscopy: a randomized, double-blind, controlled trial

BackgroundThe infusion of magnesium sulfate is well known to reduce arterial pressure and attenuate hemodynamic response to pneumoperitoneum. This study aimed to investigate whether different doses of magnesium sulfate can effectively attenuate the pneumoperitoneum-related hemodynamic changes and the release of vasopressin in patients undergoing laparoscopic gastrointestinal surgery.MethodsSixty-nine patients undergoing laparoscopic partial gastrectomy were randomized into three groups: group L received magnesium sulfate 30 mg/kg loading dose and 15 mg/kg/h continuous maintenance infusion for 1 h; group H received magnesium sulfate 50 mg/kg followed by 30 mg/kg/h for 1 h; and group S (control group) received same volume 0.9% saline infusion, immediately before the induction of pneumoperitoneum. Systemic vascular resistance (SVR), cardiac output (CO), mean arterial pressure (MAP), heart rate (HR), central venous pressure (CVP), serum vasopressin and magnesium concentrations were measured. The extubation time, visual analogue scale were also assessed. The primary outcome is the difference in SVR between different groups. The secondary outcome is the differences of other indicators between groups, such as CO, MAP, HR, CVP, vasopressin and postoperative pain score.ResultsPneumoperitoneum instantly resulted in a significant reduction of cardiac output and an increase in mean arterial pressure, systemic vascular resistance, central venous pressure and heart rate in the control group (P < 0.01). The mean arterial pressure (T2 – T4), systemic vascular resistance (T2 – T3), central venous pressure(T3-T5) and the level of serum vasopressin were significantly lower (P < 0.05) and the cardiac output (T2 – T3) was significantly higher (P < 0.05) in group H than those in the control group. The mean arterial pressure (T4), systemic vascular resistance (T2), and central venous pressure(T3-T4) were significantly lower in group H than those in group L (P < 0.05). Furthermore, the visual analog scales at 5 min and 20 min, the level of vasopressin, and the dose of remifentanil were significantly decreased in group H compared to the control group and group L (P < 0.01).ConclusionMagnesium sulfate could safely and effectively attenuate the pneumoperitoneum-related hemodynamic instability during gastrointestinal laparoscopy and improve postoperative pain at serum magnesium concentrations above 2 mmol/L.Trial registrationThe study was retrospectively registered at Chinese Clinical Trial Registry; the registration number is ChiCTR-IPD-17011145, principal investigator: D.Y. Q., date of registration: April 13, 2017.

Efficacy and Safety Aspects of Remifentanil Sedation for Intubation in Neonates: A Retrospective Study.

Objective: To evaluate the efficacy and safety of remifentanil as a premedication in neonates undergoing elective intubation.Study Design: This retrospective study focused on neonates admitted to the Neonatal Intensive Care Unit of Port-Royal, Paris Centre University Hospitals, France, between June 2016 and November 2017, who received remifentanil before an elective intubation. First, atropine (10 μg/kg) was administered intravenously as a bolus, followed by remifentanil, which was administrated continuously. The dose of remifentanil was reduced twice during the study period in order to administer the minimum effective dose and thus reduce possible adverse events.Results: Fifty-four neonates were exposed to remifentanil and atropine. The intubating conditions were excellent or good for 46 procedures (85%) and the median Acute Pain in Newborn Infants score was 2 (IQ 25-75: 0–5) before the sedation, 1 (0–2) during the laryngoscopy, and 0 (0–0) after the intubation. The intubation was successful at the first attempt for 18 patients (33%). Chest wall rigidity occurred in 6 procedures (11%), other respiratory problems in 5 (9%), and laryngospasm in 1 (2%). Some of the procedures were complicated by bradycardia (23%) or desaturation (37%).Conclusions: Remifentanil and atropine prior to intubation provided satisfactory intubating conditions in neonates. Nevertheless, severe adverse effects (such as chest wall rigidity) are a potential risk, possibly related to the total dose received. These data do not support the safety of using remifentanil alone prior to intubation in neonates.

Os efeitos do remifentanil sobre os marcadores do estresse oxidativo durante a cesariana, em correlação com a hemodinâmica materna e o desfecho neonatal: um estudo randômico controlado

Background and objectiveRemifentanil is used to attenuate maternal hemodynamic response to intubation and surgical stress during Induction–Delivery period of cesarean section. The goal was to compare the effects of two remifentanil dosing regimens on oxidative stress level, in correlation with its hemodynamic and neonatal effects. MethodsFifty‐one patients, 17 per group, enrolled for elective cesarean section were randomly divided by computer‐generated codes into three parallel groups: (A) patients received a 1μg.kg−1 remifentanil bolus immediately before induction, followed by 0.15μg.kg−1.min−1 infusion, that was stopped after skin incision; (B) patients received a 1μg.kg−1 remifentanil bolus immediately before induction; (C) (control), patients did not receive remifentanil until delivery. Maternal venous blood samples were taken at basal time, at extraction and 30minutes after the end of operation for spectrophotometrical determination of malondialdehyde and advanced oxidation protein products concentration. The same was conducted for umbilical venous sample. ResultsSystolic blood pressure and heart rate remained significantly lower in group A compared to B and C during entire Induction–Delivery period (p<0.001, p=0.02 after intubation; p=0.006, p=0.03 after skin incision; p=0.029, p=0.04 after extraction; respectively). Malondialdehyde concentration was lower at time of extraction in maternal blood in group A compared to B and C (p=0.026). All neonatal Apgar scores were ≥ 8 and umbilical acid–base values within normal range. ConclusionsThe remifentanil dosing regimen applied in group A significantly attenuated lipid peroxidation and maternal hemodynamic response during entire I–D period, without compromising neonatal outcome.

Anesthetic effect of dexmedetomidine in laparoscopic D2 radical gastrectomy and its influence on hemodynamics, visual analogue scale and Ramsay sedation score after operation

Objective To analyze the anesthetic effect of dexmedetomidine in laparoscopic D2 radical gastrectomy and its influence on hemodynamics, visual analogue scale (VAS) and Ramsay sedation score after operation. Methods A total of 86 patients who received laparoscopic D2 radical gastrectomy under general intravenous anesthesia in Shanxi Provincial Cancer Hospital from March 2017 to June 2017 were enrolled, and all the patients were divided into two groups by using random number table method. The observation group (43 cases) was intravenously injected with dexmedetomidine (0.6 μg/kg) before induction of general anesthesia, and the dose was changed to 0.4 μg/kg after 15 min with drug withdrawal till 30 minutes before surgery, the control group (43 cases) was given an equal volume of 0.9% normal saline. The mean arterial pressure (MAP) and heart rate change before anesthetic induction (T1), tracheal intubation time (T2), after intubation (T3), section time (T4) and the immediate time after intubation (T5) were compared between the two groups. The VAS and Ramsay scores at 1 h and 4 h after surgery and the intraoperative doses of anesthesia maintenance drugs were also compared between the two groups. Results The heart rate and MAP of the observation group were lower than those of the control group at the time of T1, T3-T5, the differences were statistically significant (all P < 0.05). The VAS and Ramsay scores of the observation group were better than those of the control group at 1 h and 4 h after operation, and the differences were statistically significant (all P < 0.05). The intraoperative doses of propofol and remifentanil in the observation group were (964±251) mg and (3.1±0.8) mg, respectively, which were less than those in the control group [(1 485±425) mg and (4.8±0.8) mg], the differences were statistically significant (t = 9.913, P < 0.01; t = 9.834, P < 0.01). Conclusion Dexmedetomidine can reduce the stress response of patients with laparoscopic D2 radical anesthesia, enhance the sedative effect, and reduce the dosage of propofol and remifentanil, therefore, it has high clinical application value. Key words: Stomach neoplasms; Gastrectomy; Laparoscopy; Lymph node excision; Hemodynamics; Dexmedetomidine; Pain measurement; Ramsay sedation score

Spontaneous Ventilation versus Mechanical Ventilation During Video-Assisted Thoracoscopic Surgery for Spontaneous Pneumothorax: A Multicenter Randomized Controlled Trial

Background: Spontaneous ventilation VATS (SV-VATS) is reported to be associated with faster recovery and fewer complications than mechanical ventilation video-assisted thoracic surgery (MV-VATS). This study aimed to evaluate the effect of SV-VATS for patients with spontaneous pneumothorax. Methods: We performed a randomized controlled trial at 10 medical centers by recruiting primary pneumothorax patients undergoing SV-VATS and MV-VATS. Participants were randomly assigned (1:1), to receive non-intubated spontaneous ventilation (SV-VATS) or intubated mechanical one lung ventilation (MV-VATS). The primary outcome was the intraoperative surgery/anesthesia related accident rate, which was assessed according to incedences of intraoperative hypoxia, conversion to open surgery, conversion to intubation and other intraoperative adverse events that could happen in both groups. Other study outcomes included changes of vital signs, total analgesic dose, recovery time, post-operative complication rates, cost-effectiveness evaluation, etc. Findings: The trial began on Apr 10, 2017, and ended on Jan 03, 2019. During this time, 355 patients were assessed. After evaluation and randomization, 325 eligible patients were assigned to receive an SV-VATS (n=162) or MV-VATS (n=163) procedure. In the intention-to-treat analysis, there was no difference between the intraoperative accident rate of the SV-VATS (1.23%) and MV-VATS (1.23%) group (P=0.995). The SV-VATS group was associated with significantly decreased total dosage of both sufentanil (11.37 μg vs 20.92 μg; p<0.001) and remifentanil (269.78 μg vs 404.96 μg; p<0.001). SV-VATS was also associated with shorter extubation time (12.28 min vs 13.70 min; p<0.001) and post-anesthesia care unit (PACU) recovery time (25.43 min vs 30.67 min; p=0.003). SV-VATS significantly deceased the anesthesia cost compared with MV-VATS (2051.91 RMB VS.2754.71 RMB; P<0.001). Interpretation: SV-VATS for primary pneumothorax had a similar intraoperative surgery/anesthesia related accident rate compared with MV-VATS and can be an alternative when selecting anesthesia ventilation during operation. Trial Registration: This trial is registered with ClinicalTrials.gov, number NCT03016858. Funding Statement: Guangdong Association of Thoracic Diseases. Declaration of Interests: The authors stated: None. Ethics Approval Statement: The study protocol has been approved by the Research Ethics Committee of the First Affiliated Hospital of Guangzhou Medical university (SVA-001).

The effects of remifentanil used during cesarean section on oxidative stress markers in correlation with maternal hemodynamics and neonatal outcome: a randomized controlled trial

Background and objectiveRemifentanil is used to attenuate maternal hemodynamic response to intubation and surgical stress during Induction–Delivery period of cesarean section. The goal was to compare the effects of two remifentanil dosing regimens on oxidative stress level, in correlation with its hemodynamic and neonatal effects. MethodsFifty-one patients, 17 per group, enrolled for elective cesarean section were randomly divided by computer-generated codes into three parallel groups: (A) patients received a 1μg.kg−1 remifentanil bolus immediately before induction, followed by 0.15μg.kg−1.min−1 infusion, that was stopped after skin incision; (B) patients received a 1μg.kg−1 remifentanil bolus immediately before induction; (C) (control), patients did not receive remifentanil until delivery. Maternal venous blood samples were taken at basal time, at extraction and 30minutes after the end of operation for spectrophotometrical determination of malondialdehyde and advanced oxidation protein products concentration. The same was conducted for umbilical venous sample. ResultsSystolic blood pressure and heart rate remained significantly lower in group A compared to B and C during entire Induction–Delivery period (p<0.001, p=0.02 after intubation; p=0.006, p=0.03 after skin incision; p=0.029, p=0.04 after extraction; respectively). Malondialdehyde concentration was lower at time of extraction in maternal blood in group A compared to B and C (p=0.026). All neonatal Apgar scores were ≥ 8 and umbilical acid–base values within normal range. ConclusionsThe remifentanil dosing regimen applied in group A significantly attenuated lipid peroxidation and maternal hemodynamic response during entire I–D period, without compromising neonatal outcome.

Effects of ultrasound-guided paravertebral nerve block combined with general anesthesia on hemodynamics and recovery in thoracic surgery

Objective To compare the effects of combined paravertebral nerve block and general anesthesia on hemodynamics and recovery period in thoracic surgery. Methods Eighty patients undergoing elective thoracic surgery with American Society of Anesthesiologists(ASA) Ⅱ or Ⅲ were randomly divided into 2 groups with 40 cases in each group. Paravertebral nerve block combined general anesthesia group (TPVB group) and traditional general anesthesia control group (C group). Two groups of patients were induced with the same procedure. Sevoflurane inhalation, propofol, and remifentanil were administered intravenously to maintain anesthesia. Hemodynamic parameters before surgery (T0), after induction (T1), 3 min after the operation (T2), after the end of surgery (T3) and the number of interventions requiring vasoactive drugs and dosage of analgesic drugs were measured. The time of anesthesia, operation time, and recovery time, extubation time and pain score were recorded. The recovery of consciousness was assessed by using Observer′s Assessment of Alertness/Sedation Scale (OAA/S) score. Results Systolic blood pressure (SBP), diastolic blood pressure (DBP) and heart rate were significantly lower in TPVB group than in group C at the T2 timepoint. SBP and DBP were significantly higher, and heart rate was significantly lower in TPVB group than in group C at the T3 timepoint (P<0.05). The number of 4 vasoactive drugs and remifentanil dosage were significantly less in TPVB group than in group C (P<0.05). The time of blinking, extubating time and pain score of TPVB group were significantly better than those of group C (P<0.05). Postoperative opening the eyes by prompting time, extubating time, and pains cores were significantly better in TPVB group than in group C (P<0.05). The OAA/S scores before and after extubating were significantly higher in TPVB group than in group C (P<0.05). Conclusions Combination of paravertebral nerve block with general anesthesia leads to more stable hemodynamics, earlier time for extubation, and less postoperative pain scores in patients undergoing thoracic surgery. Key words: Paravertebral nerve block; Anesthesia, general; Hemodynamics

Efficacy and safety of remifentanil in a rapid sequence induction in elderly patients: A three-arm parallel, double blind, randomised controlled trial

BackgroundRapid sequence induction (RSI) is recommended in patients at risk of aspiration, but induced haemodynamic adverse events, including tachycardia. In elderly patients, this trial aimed to assess the impact of the addition of remifentanil during RSI on the occurrence of: tachycardia (primary outcome), hypertension (due to intubation) nor hypotension (remifentanil). MethodsIn this three-arm parallel, double blind, multicentre controlled study, elderly patients (65 to 90 years old) hospitalised in three centres and requiring RSI were randomly allocated to three groups, where anaesthesia was induced with etomidate (0.3mg/kg) followed within 15seconds by either placebo, or low (0.5μg/kg), or high (1.0μg/kg) doses of remifentanil, followed by succinylcholine 1.0mg/kg. Heart rate (HR) and mean arterial pressure (MAP) were recorded before induction and after intubation. ResultsIn total, eighty patients were randomised and analysed. Baseline HR and MAP were similar between groups. For primary endpoint, the absolute change in HR between induction and intubation was greater in the control group (15 bpm; 95% CI [8–21]) than that in the remifentanil 0.5μg/kg group (4 bpm; 95% CI [−1-+8]; P=0.005) and the remifentanil 1.0μg/kg group (−3 bpm; 95% CI [−9-+3]; P<0.0001). The increase in MAP was greater in the placebo group than in both remifentanil groups (P<0.0001). Twice as many hypertension episodes were recorded in the placebo group compared to the remifentanil 0.5μg/kg and 1.0μg/kg groups (60%, 30%, and 28% patients respectively; P=0.032), but no placebo patients experienced hypotension episodes versus 11% and 24% in the remifentanil 0.5μg/kg and 1.0μg/kg groups respectively (P=0.016). ConclusionRemifentanil (0.5–1.0μg/kg) prevents the occurrence of tachycardia and hypertension in elderly patients requiring RSI.

THE EFFECT OF REMIFENTANIL ON INTUBATION CONDITIONS IN PATIENTS UNDERGOING CAESAREAN DELIVERY UNDER GENERAL ANESTHESIA: COMPARISON OF TWO DOSING REGIMENS

The objective of our study was to compare the effects of two remifentanil dosing regimens, used during induction-delivery period of cesarean section, and of remifentanil-free control on maternal intubating conditions and hemodynamic response to endotracheal intubation as well as on neonatal outcome. Seventy seven ASA physical status I-II women with singleton term pregnancy, who were scheduled for elective cesarean section in general anesthesia and have given written informed consent, were enrolled in this prospective, randomized controlled study and divided in three groups: A - 31 patient received 1 µg/kg remifentanil bolus before the induction of anesthesia, followed by 0.15 µg/kg/min remifentanil infusion that was stopped after the skin incision; B - 27 patients received only 1 µg/kg remifentanil bolus; C - 19 patients did not receive remifentanil until the delivery of the baby. Intubating conditions were qualified as excellent, good or poor. Group A had significantly higher number of patients with excellent intubating conditions (p = 0.011); majority of patients with good intubating conditions were in group C (p = 0.017). Systolic, diastolic, main arterial pressure and heart rate raised significantly in group C compared to A and B (p &lt; 0.001). Neonatal outcome did not differ between groups – all neonates were vital with first minute Apgar scores ≥ 8. In conclusion, our dosing regimen of remifentanil 1µg/kg bolus given immediately before the induction followed by 0.15 µg/kg/min interrupted after skin incision provided the best compromise between the achievement of excellent intubating conditions, attenuation of maternal hemodynamic stress response to endotracheal intubation and avoidance of neonatal respiratory depression.

Analgesic effect of the midazolam-induced anesthesia in different doses on the patients after the thoracoscopic resection of lung cancer.

ObjectiveTo elaborate the analgesic efficiency of midazolam-induced anesthesia in different doses on the patients following the thoracoscopic resection of lung cancer.MethodsNinety patients undergoing thoracoscopic resection of lung cancer between August 2017 and July 2018 were randomized in the observation group (n = 45) and the control group (n = 45). Patients in observation group underwent the anesthesia induced by 0.1 mg/kg midazolam, while for the control group, the dose was adjusted to 0.05 mg/kg. Then, we compared the levels of inflammatory factors, SaO2, average of arterial pressure and changes in heart rate before and after surgery (48 h) to analyze the efficacy.ResultsAt the postoperative 48 h, patients in the observation group had lower levels of inflammatory factors when comparing with their counterparts in the control group [IL-6, IL-8, IL-1β and TNF-α: (58.44 ± 3.22) μg/L, (2.04 ± 0.26) μg/L, (2.98 ± 0.44) μg/L, (5.33 ± 0.77) μg/L v.s. (96.44 ± 4.54) μg/L, (3.23 ± 0.33) μg/L, (3.77 ± 0.44) μg/L, (7.64 ± 0.99) μg/L] (P < 0.05). Meanwhile, those in the observation group had a lower SaO2, average arterial pressure and heart rate [(93.79 ± 1.08)%, (93.22 ± 3.46) mmHg, (87.55 ± 2.35) beat/min v.s. (97.13 ± 1.03)%, (96.44 ± 4.03) mmHg, (91.05 ± 2.89) beat/min] (P < 0.05). However, no statistical significance was identified in the differences of the bleeding amount, surgical time and anesthesia time between two groups (P > 0.05), while the eye-opening time and the extubation time in the observation group were all shorter than those in the control group (P < 0.05). Similarly, the postoperative pain scores, total doses of propofol and remifentanil were also lowered (P < 0.05).ConclusionFor patients of thoracoscopic resection of lung cancer, midazolam-induced anesthesia (0.1 mg/kg) performs better than 0.5 mg/kg in inhibiting the inflammatory responses, with significant reduction in the dose of anesthetics, thereby stabilizing the status of patients in perioperative period and mitigating the postoperative pains. Thus, it is potential candidate.

A small dose of remifentanil pretreatment suppresses sufentanil-induced cough during general anesthesia induction: a randomized, double-blind, placebo-controlled trial

BackgroundIntravenous use of sufentanil can elicit cough. This study aimed to evaluate the inhibitory effect of pre-injection of a mall dose of remifentanil on sufentanil-induced cough during the induction of general anesthesia.MethodsThis prospective, randomized, controlled trial was conducted from January 10, 2019 to March 01, 2019. A total of 100 patients undergoing elective surgery under general anesthesia were enrolled, and at last 84 patients were included and randomly allocated into two equal size groups (n = 42): Patients in the Remifentanil group (R group) received an intravenous infusion of remifentanil 0.3 μg/kg (diluted to 2 ml) 1 min before sufentanil injection; patients in the Control group (C group) received 2 ml of normal saline (NS) at the same time point. Injections of patients in both groups were completed within 5 s. Then, sufentanil 0.5 μg/kg was injected within 5 s and the number of coughs that occurred within 1 min after sufentanil injection were recorded. One minute after sufentanil injection, etomidate 0.3 mg/kg and cisatracurium 0.15 mg/kg were given for general anesthesia induction irrespective of the presence or absence of cough. The mean arterial pressure (MAP) and heart rate (HR) at time points just before remifentanil pretreatment administration (T0), 3 min after administration (T1), 1 min after intubation (T2), and 3 min after intubation (T3) were recorded.ResultsThe incidence of cough in patients in the R group and C group was 4.8 and 31%, respectively. Compared with group C, the incidence and severity of cough in group R was significantly lower (P < 0.01). No significant differences were observed in MAP and HR at the time of general anesthesia induction between the two groups (P > 0.05).ConclusionPretreatment with a small dose of remifentanil effectively and safely reduced the incidence and severity of cough induced by sufentanil during anesthesia induction and can be used as an alternative treatment to inhibit coughing caused by sufentanil.Trial registrationChinese Clinical Trial Registry (ChiCTR1900020587, registered date: January 9, 2019), http://www.chictr.org.cn

Prevention of hypotension associated with the induction dose of remifentanil in open heart surgery for low ejection fraction patients, in Kurdistan region, Iraq

Background and objective: Hypotensive attacks commonly occur during induction of anesthesia and can result in irreversible ischemic damages to the vital body organs. This study aimed to assess the effect of using ephedrine at low doses in controlling hemodynamic changes induced by anesthesia. Methods: A single centered single-blinded, prospective comparative study was conducted in Erbil cardiac center in periods between January 2018 and July 2018. A total of 150 patients with left ventricular ejection fraction &lt;40% and age younger than 80 years were included in this study. They were divided into three main groups; the 1st group was the placebo group, the 2nd group received ephedrine at a dose of 0.035mg/kg body weight, and the 3rd group received ephedrine at a dose of 0.07 mg/kg body weight. Systolic blood pressure, diastolic blood pressure, mean arterial blood pressure, and heart rate were reported in three different phases; before induction, two minutes after induction, and five minutes after induction of anesthesia. Results: In the placebo group, induction of anesthesia by 3mcg/Kg of remifentanil significantly reduces diastolic, systolic, and mean arterial pressure with P &lt;0.001. At two minutes after using ephedrine at the dose of 0.035 mg/kg in the induction of anesthesia significantly increases the diastolic, systolic, and mean arterial pressure with P = 0.002, &lt;0.001, and 0.007, respectively, and at five minutes after induction with P = 0.02, 0.03, and 0.04, respectively. Using ephedrine at a dose of 0.07mg/kg induction of anesthesia was found to significantly increase the diastolic, systolic, and mean arterial pressure with P &lt;0.001 for all the readings. The heart rate was not significantly affected by using remifentanil alone or in combination with ephedrine during induction of anesthesia. Conclusion: Using ephedrine at different doses during induction of anesthesia with remifentanil in patients with low ejection fraction significantly prevents hypotensive attacks.