piperidines and esmolol

The last ten years have been a period of extensive research and development of new agents for the treatment of cardiac rhythm abnormalities. Several new subclass Ic agents have been developed, and more recently the class III agents have become the focus of attention. These new agents are all remarkable for their potency and potential for producing side effects. While none of these agents offers the perfect cure for the treatment or prevention of cardiac arrhythmias, they all offer advantages and options that are valuable for clinical management of patients.

Topics: Amiodarone; Anilides; Anti-Arrhythmia Agents; Arrhythmias, Cardiac; Benzeneacetamides; Encainide; Flecainide; Humans; Mexiletine; Piperidines; Propafenone; Propanolamines

Esmolol an ultrashort acting cardioselective β1-adrenergic receptor antagonist), has been successfully employed for perioperative sympatholysis. In this study, we tested the hypothesis that perioperative esmolol administration resulted in decreased postoperative pain and improves the hemodynamic balance in patients with rhinoplasty.. In this clinical trial study, fifty-six patients (56) undergoing rhinoplasty surgery were randomly distributed into two groups (Group E and Group C). Patients in the Group E were administered 5-10 µg/kg/min of esmolol in combination with propofol and remifentanil titrated to hemodynamic response. Patients in the Group C were administered normal saline, having same volume as the esmolol in addition to propofol and remifentanil. The mean blood pressure, opioid requirement, pain score, and heart rate were evaluated 30 min, 1 h and 3 h, respectively, after surgery.. Postoperative pain was reduced significantly in the first 3 postoperative hours, and the need to use morphine was decreased in the group receiving esmolol. Group E patients had significantly less variations in blood pressure and heart rate postoperatively.. Intraoperative esmolol infusion is a valid method to reduce postoperative pain, it provide lesser need to analgesics and hemodynamic stability in first 3 hours of post rhinoplasty surgery.

Topics: Adrenergic beta-1 Receptor Antagonists; Adult; Analgesics, Opioid; Anesthetics, Intravenous; Blood Pressure; Double-Blind Method; Drug Therapy, Combination; Female; Heart Rate; Humans; Infusions, Intravenous; Intraoperative Care; Male; Pain Measurement; Pain, Postoperative; Piperidines; Propanolamines; Propofol; Prospective Studies; Remifentanil; Rhinoplasty; Treatment Outcome; Young Adult

Breast reduction surgery is a common cosmetic surgery with a high incidence of blood loss and transfusion. In this surgery, the reduction of blood loss related to surgical manipulation and the volume of resected tissue is a target. In the present study, we compared the effects of esmolol-induced controlled hypotension on surgical visibility, surgical bleeding, and the duration of surgery in patients anesthetized with propofol/remifentanil (PR) or sevoflurane/remifentanil (SR).. Patients in the American Society of Anesthesiologists I/II risk group undergoing breast reduction surgery were prospectively randomized into PR (n = 25) and SR (n = 25) groups. Controlled hypotension was induced with esmolol in both groups. During the intraoperative period, the heart rate (HR), mean arterial pressure (MAP), operation duration, volume of intraoperative blood loss, volume of blood received through postoperative drains, volume of resected tissues, and surgical area bleeding score were recorded.. The duration of operation in the incisional period was shorter in group PR compared to group SR (P = 0.04). The change in HR was lower in incision and hemostasis periods in the group PR compared to the group SR (P < 0.001). Total intraoperative intraoperative bleeding volume and volume of blood received through drains on postoperative postoperative day 1, day 2, and in total were found to be significantly lower in group PR compared to group SR. Surgical visibility scoring was more effective in group PR compared to SR.. In the breast reduction surgery performed under esmolol-induced controlled hypotension, the effect of propofol + remifentanil anesthesia on the duration of incisional surgery, surgical visibility, and volume of surgical blood loss was more reliable and effective compared to that of sevoflurane + remifentanil, which seems to be an advantage.

Topics: Adrenergic beta-1 Receptor Antagonists; Adult; Anesthesia, Intravenous; Anesthetics, Inhalation; Anesthetics, Intravenous; Blood Loss, Surgical; Female; Humans; Hypotension, Controlled; Mammaplasty; Methyl Ethers; Middle Aged; Piperidines; Propanolamines; Propofol; Remifentanil; Sevoflurane

Propofol is associated with pain during injection, which is stressful to patients. The present study was designed to investigate the analgesic effect of pretreatment with remifentanil and esmolol in minimizing propofol injection pain, compared with placebo.. In a randomized, double-blind, prospective trial, 120 patients, scheduled for elective dental surgery under general anesthesia, were randomized to 1 of the 4 treatment arms (n = 30 each) receiving normal saline, remifentanil 0.35 μg/kg, esmolol 0.5 mg/kg, and 1 mg/kg before administration of propofol. During injection of 1% propofol 0.5 mg/kg, pain was evaluated by a 4-point score (0 = none, 1 = mild, 2 = moderate, 3 = severe). Any adverse effects such as hypotension and bradycardia were recorded during the perioperative periods.. In all, 120 patients completed this study. There were no significant differences in terms of demographic data. The incidence of pain on injection of propofol was 11 (36.7%) with remifentanil 0.35 μg/kg, 12 (40%) with esmolol 0.5 mg/kg, and 11 (36.7%) with esmolol 1 mg/kg, compared with 25 (83.3%) with normal saline (respectively, P < 0.05). There were no significant differences in the incidence of pain between groups with remifentanil 0.35 μg/kg, and esmolol 0.5 mg/kg and 1 mg/kg. There were no emergence reactions such as hypotension and bradycardia in all groups.. Pretreatment with esmolol 0.5 mg/kg and 1 mg/kg and remifentanil 0.35 μg/kg equally decreased pain during propofol injection.

Topics: Adrenergic beta-1 Receptor Antagonists; Adult; Analgesics, Opioid; Anesthetics, Intravenous; Double-Blind Method; Female; Humans; Injections; Male; Middle Aged; Pain; Piperidines; Propanolamines; Propofol; Remifentanil

Adequate cerebral perfusion pressure with quick and smooth emergence from anesthesia is a major concern of the neuroanesthesiologist. Anesthesia techniques that minimize anesthetic requirements and their effects may be beneficial. Esmolol, a short acting hyperselective β-adrenergic blocker is effective in blunting adrenergic response to several perioperative stimuli and so it might interfere in the effect of the anesthetic drugs on the brain. This study was designed to investigate the effect of esmolol on the consumption of propofol and sevoflurane in patients undergoing craniotomy.. Forty-two patients that underwent craniotomy for aneurysm clipping or tumour dissection were randomly divided in two groups (four subgroups). Anesthesia was induced with propofol, fentanyl and a single dose of cis-atracurium, followed by continuous infusion of remifentanil and either propofol or sevoflurane. Patients in the esmolol group received 500 mcg/kg of esmolol bolus 10 min before induction of anesthesia, followed by additional 200 mcg/kg/min of esmolol. Monitoring of the depth of anesthesia was also performed using the Bispectral Index-BIS and cardiac output. The inspired concentration of sevoflurane and the infusion rate of propofol were adjusted in order to maintain a BIS value between 40-50. Intraoperative emergence was detected by the elevation of BIS value, HR or MAP.. The initial and the intraoperative doses of propofol and sevoflurane were 18-50 mcg/kg/min and 0.2-0.5 MAC respectively in the esmolol group, whereas in the control group they where 100-150 mcg/kg/ and 0.9-2.0 MAC respectively (p = 0.000 for both groups). All procedures were anesthesiologically uneventful with no episodes of intraoperative emerge.. Esmolol is effective not only in attenuating intraoperative hemodynamic changes related to sympathetic overdrive but also in minimizing significant propofol and sevoflurane requirements without compromising the hemodynamic status. ClinicalTrials.gov Identifier: NCT02455440 . Registered 26 May 2015.

Topics: Adrenergic beta-1 Receptor Antagonists; Adult; Aged; Airway Extubation; Anesthesia; Anesthetics, Intravenous; Arterial Pressure; Atracurium; Consciousness Monitors; Craniotomy; Dose-Response Relationship, Drug; Female; Fentanyl; Heart Rate; Humans; Male; Methyl Ethers; Middle Aged; Piperidines; Propanolamines; Propofol; Prospective Studies; Remifentanil; Sevoflurane

To investigate whether a continuous infusion of low-dose esmolol results in an opioid-sparing effect during surgery.. Randomized, double-blinded, placebo-controlled clinical comparison study.. Operating room of a university hospital.. 56 ASA physical status 1 and 2 patients, aged 20 to 60 years, undergoing laparoscopic gynecologic surgery of less than two hours' duration.. The esmolol group (n = 28) received a 0.5 mg/kg loading dose of esmolol followed by an infusion of esmolol 30 μg/kg/min; the saline group (n = 28) received equivalent volumes of normal saline.. The effect-site concentration of remifentanil (ng/mL) to maintain adequate anesthetic depth before infusion of the study drug (before-concentration) was measured. During infusion of study drug, the effect-site concentration of remifentanil was adjusted every 5 minutes to maintain systolic blood pressure within 15% of baseline and a Bispectral Index value between 50-60. The average of these adjusted concentrations (after-concentration) was measured and compared to the before-concentration. The quality of postoperative recovery was assessed.. In the esmolol group, the after-concentration of remifentanil was decreased by 33.3% compared with the before-concentration. The total dose of remifentanil infused was also lower in the esmolol group (0.09 ± 0.1 vs 0.14 ± 0.03 μg/kg/min; P = 0.031). The esmolol group had lower scores on a pain numerical rating scale and required less fentanyl in the Postanesthesia Care Unit.. Intraoperative esmolol infusion decreases both the requirement for remifentanil and postoperative administration of rescue analgesics.

Topics: Adrenergic beta-1 Receptor Antagonists; Adult; Analgesics, Opioid; Anesthetics, Intravenous; Double-Blind Method; Drug Administration Schedule; Female; Gynecologic Surgical Procedures; Humans; Infusions, Intravenous; Laparoscopy; Middle Aged; Pain, Postoperative; Piperidines; Postoperative Care; Propanolamines; Remifentanil; Young Adult

Controversy surrounds the optimal technique to moderate pain after laparoscopic cholecystectomy (LC). Opioid analgesics, sympatholytic drugs, and adjuvants, such as ketamine, have all been used. We compared esmolol with a combination of remifentanil plus ketamine in patients undergoing LC to determine the impact of these drugs on morphine requirements and pain control.. Sixty American Society of Anesthesiologists physical status I-II patients undergoing LC and anesthetized with sevoflurane were randomized to one of two groups. Group E patients received a bolus of esmolol 0.5 mg·kg(-1) iv at induction followed by an infusion of 5-15 μg·kg(-1)·min(-1), and Group R-K patients received a bolus of ketamine 0.5 mg·kg(-1) iv and remifentanil 0.5 μg·kg(-1) iv at induction followed by a remifentanil infusion titrated over a range of 0.1-0.5 μg·kg(-1)·min(-1). All patients received paracetamol, dexketoprofen, and levobupivacaine via infiltration of laparoscopic port sites. After surgery, a predetermined bolus of morphine was administered according to a verbal numerical rating scale (VNRS) for pain intensity. The primary outcome of interest was postoperative morphine requirement.. Median consumption of morphine was higher in Group R-K than in Group E (5 mg [4-6] vs 0 mg [0-2], respectively; P < 0.001). In the postanesthesia care unit, patients in Group R-K had higher pain scores than patients in Group E (difference in maximum VNRS, -11; 95% confidence interval (CI), -19 to -3). The concentration of sevoflurane to maintain a bispectral index~40 was higher in Group E than in Group R-K (between-group difference 0.3%; 95% CI, 0.15 to 0.40). The incidence of postoperative nausea and vomiting was similar between the two groups.. Intraoperative esmolol infusion reduces morphine requirements and provides more effective analgesia compared with a combination of remifentanil-ketamine given by infusion in patients undergoing LC.

Topics: Adrenergic beta-1 Receptor Antagonists; Adult; Aged; Analgesics; Analgesics, Opioid; Cholecystectomy, Laparoscopic; Double-Blind Method; Drug Therapy, Combination; Female; Humans; Infusions, Intravenous; Ketamine; Male; Middle Aged; Morphine; Pain, Postoperative; Piperidines; Propanolamines; Remifentanil

To observe the effects of remifentanil or esmolol on the stress responses during electric shock therapy in psychiatric patients.. Upon the approval of institutional Ethics Committee, Eighty psychiatric patients requiring electric shock therapy were randomly divided into 2 groups:esmolol group (Group E) and remifentanil group (Group R) (n = 40 each). The patients in Groups E and R were injected with esmolol 1 mg/kg or remifentanil 2 µg/kg respectively before induction of anesthesia. Electric shock therapy was performed after a disappearance of fasciculation. MAP (mean arterial pressure) and HR (heart rate) were recorded at the following time points:prior to anesthesia (T0), prior to electric shock therapy (T1) and at 1 min (T2), 3 min (T3) & 5 min (T4) after electric shock therapy. Venous blood samples were collected at (T0) and (T4). The plasma levels of cortisol and norepinephrine were determined by enzyme-linked immunosorbent assay.. The levels of MAP and HR at T2, T3 were significantly higher than those at T0 in Group E (P < 0.05). And the levels of cortisol and norepinephrine at T4 were significantly higher than those at T0 in 2 groups (P < 0.05). However, their levels were significantly higher in Group E than those in Group R (P > 0.05).. In modified electric convulsive treatment, remifentanil is superior to esmolol in maintaining the stabilization of cardiovascular system and effectively inhibiting the stress responses.

Topics: Adult; Blood Pressure; Electroconvulsive Therapy; Female; Heart Rate; Humans; Male; Middle Aged; Piperidines; Propanolamines; Psychotic Disorders; Remifentanil; Stress, Physiological; Young Adult

This study was designed to compare the effectiveness of remifentanil vs. a lidocaine-esmolol combination in blunting the hemodynamic response to laryngoscopy and intubation during rapid sequence induction using thiopental and rocuronium in normotensive patients.. Sixty-six patients with American Society of Anesthesiologists (ASA) physical status class I who required tracheal intubation for elective surgery were randomly assigned to one of two groups. Group R received 0.9% saline 10 ml and remifentanil 1 microg/kg. Group LE received lidocaine 1.5 mg/kg and esmolol 1.0 mg/kg. Anesthesia was induced with thiopental sodium 5 mg/kg, followed by rocuronium 1.0 mg/kg. Mean arterial pressure and heart rate were recorded at baseline, after induction, immediately after intubation and every minute for five minutes after intubation.. Changes in mean arterial pressure over time between the two groups were significantly different (P<0.0001). The maximum pressor response was observed immediately after intubation, at which time the mean arterial pressure change from baseline in group LE (29.7%) (95% confidence interval [CI]: 116.1, 121.9) was higher than that in group R (4.4%) (95% CI: 92.9, 98.5) (P<0.0001). Two patients in group R and 15 patients in group LE developed hypertension (odds ratio [OR]: 0.064) (P<0.001). Changes in heart rate over time between the two groups were not significantly different (P=0.465).. The results of this study show that remifentanil 1 mg/kg is more effective than the combination of lidocaine 1.5 mg/kg and esmolol 1 mg/kg for attenuating the hemodynamic responses to rapid sequence intubation.

Topics: Adrenergic beta-Antagonists; Adult; Anesthesia, General; Anesthesia, Inhalation; Anesthetics, Intravenous; Anesthetics, Local; Blood Pressure; Female; Heart Rate; Hemodynamics; Humans; Intubation, Intratracheal; Laryngoscopy; Lidocaine; Male; Middle Aged; Piperidines; Propanolamines; Remifentanil

To assess the effect of esmolol added to propofol-remifentanil combination for hypotensive anesthesia on hemodynamic conditions, consumption of anesthetic drugs, and recovery, during elective septorhinoplasty.. This prospective, randomized study was carried out at Gazi University, Faculty of Medicine, Ankara, Turkey in 2005. Following Institutional Ethical Committee approval, 40 American Society of Anesthesiologists (ASA) I patients were divided into 2 equal groups group remifentanil infusion RP and group esmolol infusion (RP-E). After anesthesia induction with propofol (2-2.5 mg/kg), the mean arterial pressure was aimed to be between 50 mm Hg and 65 mm Hg for controlled hypotensive anesthesia in both groups. In group RP, a remifentanil infusion of 0.1-0.5 microg/kg/min was titrated, following a bolus of 1 microg/kg; for group RP-E, an esmolol infusion of 100-300 mg/kg/min was titrated, following a bolus of 500 microg/kg; to achieve a target blood pressure. In addition, propofol was infused according to depth of anesthesia to maintain anesthesia in both groups. Electrocardiography, heart rate, blood pressure, cardiac output, and consumption of anesthetic drugs were recorded. Postoperatively, recovery times, visual analog pain scores, and side effects were observed.. The decrease in the intraoperative heart rate was more significant in group RP-E than in group RP. The remifentanil consumption was much lower in group RP-E. The recovery times were similar in both groups.. Addition of esmolol to propofol-remifentanil combination leads to a decrease in remifentanil consumption, without a decrease in cardiac output during hypotensive anesthesia.

Topics: Adolescent; Adult; Anesthetics; Hemodynamics; Humans; Hypotension; Middle Aged; Piperidines; Propanolamines; Propofol; Remifentanil; Young Adult

Monitoring of analgesia remains a challenge during general anaesthesia. The surgical stress index (SSI) is derived from the photoplethysmographic waveform amplitude and the heart beat-to-beat interval. We evaluated the ability of SSI to measure surgical stress in patients undergoing gynaecological laparoscopy. Our hypothesis was that while keeping State Entropy (SE) at a predetermined level, SSI would be higher in patients receiving a beta-blocking agent (esmolol) than in those receiving an opioid (remifentanil) during laparoscopy.. Thirty women undergoing gynaecological laparoscopy were assigned randomly to receive esmolol (n = 15) or remifentanil (n = 15). Anaesthesia was induced with propofol and fentanyl and maintained with desflurane and nitrous oxide 50% in oxygen to keep SE at 50(5). The infusion of esmolol or remifentanil was started before laparoscopy and adjusted to keep the systolic blood pressure at -20 to +10% from the preoperative value.. During the fentanyl phase, before surgery, both groups behaved similarly, with an increase in SSI after intubation. In the patients receiving esmolol, the SSI reacted to the initial incision (P < 0.05), and remained high after trocar insertion (P < 0.05). In patients receiving remifentanil, it did not react to the initial incision, but increased after trocar insertion (P < 0.05), and it remained lower both after incision (P < 0.05) and after trocar insertion (P < 0.05).. SSI was higher in patients receiving esmolol. The index seems to reflect the level of surgical stress and may help guide the use of opioids during general anaesthesia.

Topics: Adrenergic beta-Antagonists; Adult; Ambulatory Surgical Procedures; Analgesics, Opioid; Anesthesia, General; Blood Pressure; Entropy; Female; Gynecologic Surgical Procedures; Heart Rate; Humans; Intraoperative Complications; Laparoscopy; Middle Aged; Piperidines; Propanolamines; Remifentanil; Severity of Illness Index; Stress, Physiological

To compare the effects of esmolol and remifentanil, used as adjuncts for induced hypotension on surgical conditions and short-term cognitive functions, during tympanoplasty.. The study was conducted in Hacettepe University, School of Medicine, Ankara, Turkey between January 2005 and December 2006 following Institutional Ethical Committee approval, 40 ASA I-II patients, between 18 and 60 years of age were included in this study. With the induction of anesthesia, for group E, an esmolol infusion of 50-250 ug.kg-1.min-1 was titrated, following a bolus of 0.5 mgxkg-1; for group R, a remifentanil infusion of 0.2-0.5 ugxkg-1xmin-1 was titrated; to achieve a mean blood pressure (BP) of 55-65 mm Hg. Arterial BP were recorded continuously throughout the operation. Mini Mental State Test (MMS) was performed at the preoperative 30th minute (MMSP), postoperative 30th minute (MMS30), 60th minute (MMS60) and 24th hour (MMS24). Surgical field was evaluated by the blinded surgeon, using a 6 point category scale.. Patient demographics were similar in both groups. Sustained controlled hypotension was sufficient in all of the groups throughout surgery. Surgical field scores were lower in group R (p<0.05), although the scores were

Topics: Adolescent; Adrenergic beta-Antagonists; Adult; Analgesics, Opioid; Anesthetics, Inhalation; Cognition; Desflurane; Female; Humans; Hypotension, Controlled; Isoflurane; Male; Middle Aged; Piperidines; Propanolamines; Prospective Studies; Remifentanil; Tympanoplasty

Monitoring of analgesia remains a challenge during general anaesthesia. Activation of Response Entropy (RE) to painful stimuli has been suggested to be a sign of inadequate analgesia. We evaluated the ability of RE to be more sensitive than State Entropy (SE) in measuring nociception in patients undergoing gynaecological laparoscopy. Our hypothesis was that while keeping SE at a predetermined level, RE would be higher in patients receiving a beta-blocking agent (esmolol) instead of an opioid (remifentanil) during a propofol/nitrous oxide anaesthesia.. Fifty-one women aged between 22-53 years were randomly assigned to receive esmolol (n=25) or remifentanil (n=26). SE was kept at 50+/-5. RE and SE were recorded at an interval of 30 s to 2 min and the areas under the RE and SE value-time curves (AUCRE and AUCSE) were calculated during the time of intubation and start of surgery as well as during the entire anaesthesia. The difference between RE and SE recordings in both groups was determined by subtracting the AUCSE from the corresponding AUCRE. Movements of the patients were recorded.. No significant differences were detected in any of the several AUC values between the groups. The difference between RE and SE recordings was similar in both groups. Every patient in the esmolol group moved some time during the procedure interfering with surgery while no one in the remifentanil group moved.. In patients undergoing gynaecological laparoscopic day-case surgery, RE seems not to be more sensitive than SE in guiding the use of opioids during general anaesthesia.

Topics: Adrenergic beta-Antagonists; Adult; Ambulatory Surgical Procedures; Anesthesia, General; Anesthetics, Intravenous; Area Under Curve; Electroencephalography; Electromyography; Endometriosis; Female; Gynecologic Surgical Procedures; Humans; Laparoscopy; Middle Aged; Monitoring, Intraoperative; Ovarian Cysts; Pain Measurement; Piperidines; Propanolamines; Propofol; Remifentanil

We compared esmolol and remifentanil infusions with respect to their effect on intraoperative hemodynamic stability and early recovery after outpatient laparoscopic surgery when administered as IV adjuvants during desflurane anesthesia. After premedication with midazolam 2 mg IV, anesthesia was induced with propofol 2 mg. kg(-1) IV in combination with either esmolol 1 mg. kg(-1) IV (n = 27) or remifentanil 1 microg. kg(-1) IV (n = 26) and succinylcholine 1 mg. kg(-1) IV according to a randomized, double-blinded protocol. Anesthesia was initially maintained with desflurane 2.5% (subsequently titrated to maintain an electroencephalogram-bispectral index value of 60) and nitrous oxide 65% in oxygen. Before skin incision, an infusion of either esmolol (5 microg. kg(-1). min(-1)) or remifentanil (0.05 microg. kg(-1). min(-1)) was started and titrated to maintain the heart rate within 25% of the baseline value. Mivacurium, 0.04 mg/kg IV, bolus doses were administered to maintain a stable peak inspiratory pressure. Esmolol (12.8 +/- 13.1 microg. kg(-1). min(-1)) and remifentanil (0.04 +/- 0.02 microg. kg(-1). min(-1)) infusions were equally effective in maintaining a stable heart rate during these laparoscopic procedures. Although the mivacurium requirement was larger in the Esmolol group (7 +/- 5 vs 3 +/- 4 mg), the Esmolol group reported a smaller incidence of postoperative nausea and vomiting (4% vs 35%). Both drugs were associated with frequent "postanesthesia care unit bypass" rates (78-81%), short times to "home readiness" (119-120 min), excellent patient satisfaction (81-85%), and rapid resumption of normal activities (2.6-3.2 d). Fast-tracked patients were ready for discharge home significantly earlier (112 +/- 46 vs 151 +/- 50 min). We concluded that esmolol infusion is an acceptable alternative to remifentanil infusion for maintaining hemodynamic stability during desflurane-based fast-track anesthesia for outpatient gynecologic laparoscopic surgery.

Topics: Adrenergic beta-Antagonists; Adult; Ambulatory Surgical Procedures; Analgesics, Opioid; Anesthetics, Inhalation; Blood Pressure; Desflurane; Double-Blind Method; Female; Heart Rate; Humans; Isoflurane; Laparoscopy; Piperidines; Propanolamines; Remifentanil

To determine whether remifentanil, combined with propofol, could induce controlled hypotension, reduce middle ear blood flow (MEBF) measured by laser-Doppler flowmetry, provide a "dry" operative field, and could be compared with nitroprusside or esmolol combined with alfentanil and propofol.. Thirty patients undergoing tympanoplasty and anesthetized with 2.5 mg x kg(-1) propofol iv followed by a constant infusion of 120 microg x kg(-1) x min(-1), were randomly assigned in three groups to receive either 1 microg x kg(-1) remifentanil iv followed by a continuous infusion of 0.25 to 0.50 microg x kg(-1) x min(-1), or nitroprusside iv, or esmolol iv combined for the latter two groups with alfentanil iv.. Controlled hypotension was achieved at the target pressure of 80 mmHg within 107 +/- 16, 69 +/- 4.4, 53.3 +/- 4.4 sec for remifentanil, nitroprusside and esmolol respectively. MEBF decreased by 24 +/- 0.3, 22 +/- 3.3, 37 +/- 3% and preceded the decrease in SABP, within 30 +/- 6.1, 11.2 +/- 3.1, 15 +/- 2.8 sec for remifentanil, nitroprusside and esmolol respectively. Remifentanil, and nitroprusside decreased MEBF autoregulation less than esmolol (0.36 +/- 0.1, 0.19 +/- 0.2, -0.5 +/- 0.2). Controlled hypotension was sustained in all three groups throughout surgery, and the surgical field rating decreased in a range of 80% in all three groups. Nitroprusside decreased pH and increased PaCO2. There were no postoperative complications in any of the groups.. Remifentanil combined with propofol enabled controlled hypotension, reduced middle ear blood flow and provided good surgical conditions for tympanoplasty with no need for additional use of a potent hypotensive agent.

Topics: Adjuvants, Anesthesia; Adrenergic beta-Antagonists; Adult; Anesthesia, Intravenous; Anesthetics, Intravenous; Blood Pressure; Ear, Middle; Female; Humans; Hypotension, Controlled; Male; Nitroprusside; Piperidines; Propanolamines; Propofol; Prospective Studies; Regional Blood Flow; Remifentanil; Tympanic Membrane Perforation; Tympanoplasty; Vasodilator Agents

Topics: Adrenergic beta-Antagonists; Anesthesia; Anesthetics, Intravenous; Anesthetics, Local; Hemodynamics; Humans; Intubation, Intratracheal; Laryngoscopy; Lidocaine; Piperidines; Propanolamines; Remifentanil

To investigate whether esmolol is effective in attenuating postoperative hemodynamic changes related to sympathetic overdrive.. Clinical study.. Operating room of a university hospital.. 60 ASA physical status I, II, and III patients, age 18 to 65 years, scheduled for elective craniotomy for supratentorial neurosurgery.. Patients were given total intravenous anesthesia (TIVA) during emergence from anesthesia and up to 60 minutes after extubation. Those patients who had hypertension (defined as an increase in systolic blood pressure >20% from baseline values) and tachycardia (defined as an increase >20% in heart rate from baseline) received a loading dose of 500 microg/kg esmolol in one minute, followed by an infusion titrated stepwise (50, 100, 200, and 300 microg/kg per min) every two minutes.. The mean dose and duration of esmolol therapy were measured.. Of 60 patients, 49 (82%) who received propofol-remifentanil TIVA developed significant tachycardia and hypertension soon after extubation. Treatment with esmolol (500 microg/kg in bolus maintained at a mean rate of 200 +/- 50 microg/kg per min) effectively controlled hypertension and tachycardia in 45 of 49 patients (92%; P < 0.05) within a mean 4.30 +/- 2.20 minutes. After extubation, mean esmolol infusion time was 29 +/- 8 minutes.. In patients undergoing elective neurosurgery with propofol-remifentanil TIVA, a relatively small esmolol dose and short infusion time effectively blunts early postoperative arterial hypertension and tachycardia.

Topics: Adolescent; Adrenergic beta-Antagonists; Adult; Aged; Anesthesia Recovery Period; Anesthesia, Intravenous; Anesthetics, Intravenous; Blood Pressure; Craniotomy; Elective Surgical Procedures; Female; Heart Rate; Humans; Male; Middle Aged; Pain Measurement; Piperidines; Postoperative Complications; Propanolamines; Propofol; Prospective Studies; Remifentanil; Young Adult

Clinical hyperthyroidism is found in approximately 5% of women with a hydatidiform mole, as human chorionic gonadotropin secreted by molar tissue is structurally similar to thyroid-stimulating hormone. A hydatidiform mole occasionally presents with a co-existing viable fetus. Surgical evacuation may be indicated for significant hemorrhage or preeclampsia. Perioperative management in the presence of hyperthyroidism may be complicated by a thyroid storm. We report a case of total intravenous anesthesia with propofol and remifentanil, combined with an esmolol infusion, to control sympathetic hyperactivity during surgery.

Topics: Abortion, Induced; Adrenergic beta-Antagonists; Adult; Anesthesia, Intravenous; Anesthetics, Intravenous; Antihypertensive Agents; Antithyroid Agents; Female; Follow-Up Studies; Humans; Hydatidiform Mole; Methimazole; Piperidines; Pregnancy; Pregnancy Complications, Neoplastic; Propanolamines; Propofol; Propranolol; Remifentanil; Thyroid Function Tests; Thyrotoxicosis; Uterine Neoplasms

A 12-year-old boy with bilateral adrenal pheochromocytoma pretreated with furosemide, nifedipine, prazosin, and propranolol underwent surgical removal of the tumors. General anesthesia with desflurane, remifentanil infusion and thoracic epidural analgesia was performed. To control the blood pressure (BP), remifentanil up to 1 microg.kg(-1).min(-1) infusion rate, sodium nitroprusside, and esmolol infusions were administered successfully. Following the ligation of the adrenal veins, hemodynamic parameters were stable and neither inotropic support nor corticosteroid replacement was required. We concluded that remifentanil-based anesthesia combined with low-dose desflurane and thoracic epidural analgesia may reduce the need for vasoactive drugs in the anesthesia management of pheochromocytoma. This combination may not prevent the hemodynamic fluctuations during tumor manipulation, but appears to facilitate a rapid and stable postoperative recovery.

Topics: Adrenal Gland Neoplasms; Adrenergic beta-Antagonists; Anesthesia, Epidural; Anesthesia, General; Anesthetics, Inhalation; Anesthetics, Intravenous; Antihypertensive Agents; Blood Pressure; Child; Desflurane; Humans; Isoflurane; Male; Nitroprusside; Pheochromocytoma; Piperidines; Propanolamines; Remifentanil

Topics: Adrenergic beta-Antagonists; Analgesics, Opioid; Female; Gynecologic Surgical Procedures; Humans; Laparoscopy; Pain, Postoperative; Piperidines; Propanolamines; Remifentanil

Remifentanil (Ultiva) is a novel, ultra-short-acting opioid which has recently been approved for use as an analgesic during induction and maintenance of general anesthesia. Esmolol is a short-acting beta-blocker used during surgical procedures to reduce heart rate and blood pressure. Both drugs are metabolized by nonspecific esterases in the blood and other tissues and may be administered concomitantly during surgery. The goal of this study was to determine if coadministration of esmolol significantly alters the pharmacokinetics of remifentanil in the rat. Two groups of rats were dosed with remifentanil [25 micrograms/kg/min (n = 8)] and remifentanil plus esmolol [25 and 200 mg/kg/min (n = 7)] for 20 min. Cardiovascular measurements were collected continuously over the course of the study. Serial blood samples (12) were collected over 25 min into test tubes containing 0.5 mL of acetonitrile. Blood samples were extracted (liquid-liquid) with methylene chloride and then analyzed by a validated GC-MS assay. Compartmental data analysis was performed using PCNONLIN. The mean(+/- SD) for Cl and t1/2 observed in treatment I were 390(+/- 98) mL/min/kg and 0.69(+/- 0.27) min and in treatment II were 421(+/- 164) mL/min/kg and 0.56(+/- 0.22) min, respectively. Comparison of clearance, volume of distribution, and terminal half-life between the two groups showed that coadministration of esmolol had no significant (p < 0.05) effect on the pharmacokinetics of remifentanil in the rat.

Topics: Adrenergic beta-Antagonists; Analgesics, Opioid; Animals; Blood Pressure; Drug Interactions; Heart Rate; Male; Models, Biological; Piperidines; Propanolamines; Rats; Rats, Sprague-Dawley; Remifentanil

The goal of this study was to determine if the co-administration of esmolol (ES), a short acting cardioselective beta-blocker, significantly alters the pharmacokinetics and/or pharmacodynamics of remifentanil (REMI), an ultra short-acting opioid, in the rat.. Sprague-Dawley rats (N = 8, Wt. = 325 +/- 15 g) were surgically implanted with stainless steel cerebrocortical EEG electrodes three days before the study. Each rat was dosed with REMI (15 micrograms/kg/min), and REMI & ES (15 micrograms/kg/min and 600 micrograms/kg/min) for 21 minutes in a random crossover design. Six serial blood samples were collected over 25 minutes into test-tubes containing 0.5 ml acetonitrile. Blood samples were extracted with methylene chloride and analyzed by a validated GC-MS assay. EEG was captured and subjected to power spectral analysis (0.1-50 Hz) for spectral edge (97%).. No significant differences (p < 0.05) were found in clearance (REMI = 287 + 73 ml/min/leg vs. REMI & ES = 289 +/- 148 ml/min kg) or Vd (REMI = 286 +/- 49 ml/kg vs REMI & ES = 248 + 40 ml/kg). A linked sigmoid Emax PK-PD model was used and the pharmacodynamic parameters were not statistically different. Mean Emax and EC50 after REMI were 18.0 +/- 6.0 Hz and 32 +/- 12 ng/ml; and after REMI + ES were 19 + 4.8 Hz and 26 + 8.6 ng/ml.. At the doses tested, there is no pharmacokinetic or pharmacodynamic interaction between remifentanil and esmolol in the rat.

Topics: Adrenergic beta-Antagonists; Analgesics, Opioid; Animals; Cross-Over Studies; Drug Interactions; Electroencephalography; Half-Life; Infusions, Intravenous; Male; Metabolic Clearance Rate; Piperidines; Propanolamines; Rats; Rats, Sprague-Dawley; Remifentanil