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This study investigated the effect of dexmedetomidine in obese patients undergoing bariatric surgery.
A prospective, double-blind, randomized controlled trial was performed. Consenting obese adult patients with impaired glucose tolerance, undergoing bariatric surgery, were randomized, by a computer, to receive placebo (0.9% Sodium-chloride) or dexmedetomidine 1 ug/kg bolus in 10 minutes followed by an infusion of 0.5 ug/kg/h until the end of surgery. Baseline HgbA1c, glucose, and insulin plasmatic levels were measured. Subsequently, glucose and insulin levels were taken every 2 hours during the first 12 hours from the onset of the drug infusion. Intraoperative fentanyl and postoperative morphine consumption, pain score, the occurrence of emesis, and postoperative sedation levels were recorded as secondary outcomes.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Dexmedetomidine | Experimental | After anesthesia induction, patients who were randomized to the Dexmedetomidine group received a bolus of 1ug/kg in 10 minutes, followed by an infusion of 0.5ug/kg/h until the end of surgery. In the case of intraoperative increment of the blood pressure and/or heart rate more than 25% from its baseline, fentanyl 1ug/kg was administered. |
|
| 0.9% Sodium-chloride | Placebo Comparator | After anesthesia induction, patients who were randomized to the Placebo group received a bolus and infusion of 0.9% normal saline at the same rate as the Dexmedetomidine group until the end of surgery. In the case of intraoperative increment of the blood pressure and/or heart rate more than 25% from its baseline, fentanyl 1ug/kg was administered. |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Dexmedetomidine | Drug | A bolus of 1ug/kg in 10 minutes, followed by an infusion of 0.5ug/kg/h until the end of surgery. |
|
| Measure | Description | Time Frame |
|---|---|---|
| Plasmatic Glucose Levels (mg/dl). | Change of baseline glucose levels within the first 12 postoperative hours. | Baseline levels(T0) and at hour 2(T1), 4(T2), 6(T3), 8(T4), 10(T5), and 12(T6) after the onset of bolus and infusion of dexmedetomidine |
| Plasmatic Insulin Levels (uU/ml). | Change of baseline insulin levels within the first 12 postoperative hours. | Baseline levels(T0) and at hour 2(T1), 4(T2), 6(T3), 8(T4), 10(T5), and 12(T6) after the onset of bolus and infusion of dexmedetomidine |
| Measure | Description | Time Frame |
|---|---|---|
| Fentanyl Consumption. | Amount of fentanyl (ug/kg) intraoperatively administered. | Since the beginning of anesthesia until the end of it, an average of one hour and a half. |
| Amount (mg) of Morphine Consumed. |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Mauricio Ibacache, MD, PhD | Pontificia Universidad Catolica de Chile | Study Director |
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No patient was excluded from the study after being assigned to one arm/group.
The patients were recruited at the Pontifical Catholic University Hospital between 2012 and 2013. Twenty patients were assigned to each arm to allow some dropouts. Nonetheless, every randomized patient included in the study was analyzed at the end of it (intention to treat analysis).
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| ID | Title | Description |
|---|---|---|
| FG000 | Dexmedetomidine | After anesthesia induction, patients who were randomized to the Dexmedetomidine group received: Dexmedetomidine: A bolus of 1ug/kg in 10 minutes, followed by an infusion of 0.5ug/kg/h until the end of surgery. Fentanyl: Intraoperative fentanyl was given in case of 25% increment in the blood pressure and/or heart rate in comparison to baseline (previous anesthesia induction). Morphine Sulfate: Boluses of 3mg of intravenous morphine were given in the postoperative acute care unit. Once the pain score was equal or less than 3/10 the patient-controlled analgesia pumps were installed and the patients were discharged to their room. |
| FG001 | 0.9% Sodium-chloride | After anesthesia induction, patients who were randomized to the Placebo group received: 0.9% Sodium-chloride: The same bolus and infusion rate used in the dexmedetomidine group. Fentanyl: Intraoperative fentanyl was given in case of 25% increment in the blood pressure and/or heart rate in comparison to baseline (previous anesthesia induction). Morphine Sulfate: Boluses of 3mg of intravenous morphine were given in the postoperative acute care unit. Once the pain score was equal or less than 3/10 the patient-controlled analgesia pumps were installed and the patients were discharged to their room. |
| Title | Milestones | Reasons Not Completed | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Overall Study |
|
Baseline characteristics from the entire study population were measured.
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| ID | Title | Description |
|---|---|---|
| BG000 | Dexmedetomidine | After anesthesia induction, patients who were randomized to the Dexmedetomidine group, received a bolus of 1ug/kg in 10 minutes, followed by an infusion of 0.5ug/kg/h until the end of surgery. In the case of intraoperative increment of the blood pressure and/or heart rate more than 25% from its baseline, fentanyl 1ug/kg was administered. Dexmedetomidine: A bolus of 1ug/kg in 10 minutes, followed by an infusion of 0.5ug/kg/h until the end of surgery. Fentanyl: Intraoperative fentanyl was given in the case of 25% increment in the blood pressure and/or heart rate in comparison to baseline (previous anesthesia induction). Morphine Sulfate: Boluses of 3mg of intravenous morphine were given in the postoperative acute care unit. Once the pain score was equal or less than 3/10 a patient-controlled analgesia pump was installed and the patient was discharged to his/her room. |
| Units | Counts |
|---|---|
| Participants |
|
| Title | Description | Population Description | Parameter Type | Dispersion Type | Unit of Measure | Calculate Percentage | Denominator Units Selected | Denominators | Classes |
|---|---|---|---|---|---|---|---|---|---|
| Age, Categorical | Count of Participants |
| Type | Title | Description | Population Description | Reporting Status | Anticipated Posting Date | Parameter Type | Dispersion Type | Unit of Measure | Calculate Percentage | Time Frame | Units Analyzed | Denominator Units Selected | Arm/Group Information | Denominators | Classes | Analyses | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Primary | Plasmatic Glucose Levels (mg/dl). | Change of baseline glucose levels within the first 12 postoperative hours. | All recruited population was analyzed. | Posted | Mean | Standard Deviation | mg/dl | Baseline levels(T0) and at hour 2(T1), 4(T2), 6(T3), 8(T4), 10(T5), and 12(T6) after the onset of bolus and infusion of dexmedetomidine |
|
Intraop and 24 hours post-surgery.
Record of vital signs was written in the anesthesia sheet.
Non-serious adverse events were presented as follow:
Hypotension Bradycardia Hypotension associated with bradycardia
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| ID | Title | Description | Deaths (Affected) | Deaths (At Risk) | Serious Events (Affected) | Serious Events (At Risk) | Other Events (Affected) | Other Events (At Risk) |
|---|---|---|---|---|---|---|---|---|
| EG000 | Dexmedetomidine | After anesthesia induction, patients who were randomized to the Dexmedetomidine group, received a bolus of 1ug/kg in 10 minutes, followed by an infusion of 0.5ug/kg/h until the end of surgery. In the case of intraoperative increment of the blood pressure and/or heart rate more than 25% from its baseline, fentanyl 1ug/kg was administered. Dexmedetomidine: A bolus of 1ug/kg in 10 minutes, followed by an infusion of 0.5ug/kg/h until the end of surgery. Fentanyl: Intraoperative fentanyl was given in case of 25% increment in the blood pressure and/or heart rate in comparison to baseline (previous anesthesia induction). Morphine Sulfate: Boluses of 3mg of intravenous morphine were given in the postoperative acute care unit. Once the pain score was equal or less than 3/10 a patient-controlled analgesia pumps were installed and the patients were discharged to their room. |
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| Term | Organ System | Source Vocabulary | Assessment Type | Notes | Statistical Information |
|---|---|---|---|---|---|
| Isolated hypotension | Cardiac disorders | Systematic Assessment | Isolated hypotension |
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| Title | Organization | Phone | Extension | |
|---|---|---|---|---|
| Mauricio Ibacache MD | Pontificia Universidad Católica de Chile | +56984421425 | mibacach@med.puc.cl |
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| ID | Term |
|---|---|
| D018149 | Glucose Intolerance |
| D007333 | Insulin Resistance |
| ID | Term |
|---|---|
| D006943 | Hyperglycemia |
| D044882 | Glucose Metabolism Disorders |
| D008659 | Metabolic Diseases |
| D009750 | Nutritional and Metabolic Diseases |
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| ID | Term |
|---|---|
| D020927 | Dexmedetomidine |
| D012965 | Sodium Chloride |
| D000077330 | Saline Solution |
| D005283 | Fentanyl |
| D009020 | Morphine |
| ID | Term |
|---|---|
| D007093 | Imidazoles |
| D001393 | Azoles |
| D006573 | Heterocyclic Compounds, 1-Ring |
| D006571 | Heterocyclic Compounds |
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Prospective, randomized, placebo-controlled trial
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Blinded
| 0.9% Sodium-chloride | Drug | The same infusion rate used in the dexmedetomidine group. |
|
|
| Fentanyl | Drug | Intraoperative fentanyl was given in case of 25% increment in the blood pressure and/or heart rate in comparison to baseline (previous anesthesia induction). |
|
|
| Morphine Sulfate | Drug | Boluses of 3mg of intravenous morphine were given in the postoperative acute care unit. Once the pain score was equal or less than 3/10 the patient-controlled analgesia pumps were installed and the patients were discharged to their room. |
|
|
Morphine consumption in the first 24 postoperative hours.
| At 24h postoperative hours. |
| Pain Scores in the First 24 Postoperative Hours. | Visual analogue scale (VAS), provided by patients, ranging from 0 to 10 (0= no pain and 10= worst possible pain). We considered a pain score between 1-3, 4-6 and 7-10 as mild, moderate and severe pain, respectively. | At postoperative hours 2(T1), 4(T2), 6(T3), 8(T4), 10(T5), 12(T6) and 24(T7). |
| Sedation-agitation Scores in the First 12 Postoperative Hours. | Sedation-agitation scale (SAS), ranging from 1 to 7 (1=unarousable, 2=very sedated, 3=sedated, 4=calm and cooperative, 5=agitated, 6=very agitated and 7=dangerous agitation). | At postoperative hours 2(T1), 4(T2), 6(T3), 8(T4), 10(T5) and 12(T6). |
| Postoperative Nausea and Vomiting. | Number of patients with postoperative nausea and vomiting in the first 12 postoperative hours. | Postoperative nausea and vomiting during the first 12 postoperative hours. |
| BG001 | 0.9% Sodium-chloride | After anesthesia induction, patients who were randomized to the Placebo group received a bolus and infusion of 0.9% normal saline at the same rate as the Dexmedetomidine group until the end of surgery. In the case of intraoperative increment of the blood pressure and/or heart rate more than 25% from its baseline, fentanyl 1ug/kg was administered. 0.9% Sodium-chloride: The same dose used in the dexmedetomidine group (bolus and infusion). Fentanyl: Intraoperative fentanyl was given in the case of 25% increment in the blood pressure and/or heart rate in comparison to baseline (previous anesthesia induction). Morphine Sulfate: Boluses of 3mg of intravenous morphine were given in the postoperative acute care unit. Once the pain score was equal or less than 3/10 a patient-controlled analgesia pump was installed and the patient was discharged to his/her room. |
| BG002 | Total | Total of all reporting groups |
| Participants |
|
| Age, Continuous | Mean | Standard Deviation | years |
|
| Sex: Female, Male | Count of Participants | Participants |
|
| Region of Enrollment | Number | participants |
|
| Body Mass Index (BMI) | Mean | Standard Deviation | kg/m^2 |
|
| ASA physical status II | ASA I A normal healthy patient, ASA II A patient with mild systemic disease, ASA III A patient with severe systemic disease, ASA IV A patient with severe systemic disease that is a constant threat to life, ASA V A moribund patient who is not expected to survive without the operation, ASA VI A declared brain-dead patient whose organs are being removed for donor purposes | Count of Participants | Participants |
|
| Risk score for postoperative nausea and vomiting (PONV) in adults | This corresponds to the Apfel simplified risk score, which is based on 4 predictors: female sex, history of PONV and/or motion sickness, nonsmoking status, and use of postoperative opioids. The higher the number of risk factors the more probable the incidence of PONV. | Count of Participants | Participants |
|
| Baseline HbA1c | Mean | Standard Deviation | Percentage |
|
| OG001 | 0.9% Sodium-chloride | After anesthesia induction, patients who were randomized to the Placebo group received: 0.9% Sodium-chloride: The same rate infusion used in the dexmedetomidine group (bolus and infusion). Fentanyl: Intraoperative fentanyl was given in case of 25% increment in the blood pressure and/or heart rate in comparison to baseline (previous anesthesia induction). Morphine Sulfate: Boluses of 3mg of intravenous morphine were given in the postoperative acute care unit. Once the pain score was equal or less than 3/10 a patient-controlled analgesia pumps were installed and the patients were discharged to their room. |
|
|
|
| Primary | Plasmatic Insulin Levels (uU/ml). | Change of baseline insulin levels within the first 12 postoperative hours. | Posted | Mean | Standard Deviation | uU/dl | Baseline levels(T0) and at hour 2(T1), 4(T2), 6(T3), 8(T4), 10(T5), and 12(T6) after the onset of bolus and infusion of dexmedetomidine |
|
|
|
|
| Secondary | Fentanyl Consumption. | Amount of fentanyl (ug/kg) intraoperatively administered. | Posted | Mean | Standard Deviation | mcg/kg | Since the beginning of anesthesia until the end of it, an average of one hour and a half. |
|
|
|
| Secondary | Amount (mg) of Morphine Consumed. | Morphine consumption in the first 24 postoperative hours. | Posted | Mean | Standard Deviation | mg | At 24h postoperative hours. |
|
|
|
| Secondary | Pain Scores in the First 24 Postoperative Hours. | Visual analogue scale (VAS), provided by patients, ranging from 0 to 10 (0= no pain and 10= worst possible pain). We considered a pain score between 1-3, 4-6 and 7-10 as mild, moderate and severe pain, respectively. | Posted | Median | Inter-Quartile Range | units on a scale | At postoperative hours 2(T1), 4(T2), 6(T3), 8(T4), 10(T5), 12(T6) and 24(T7). |
|
|
|
| Secondary | Sedation-agitation Scores in the First 12 Postoperative Hours. | Sedation-agitation scale (SAS), ranging from 1 to 7 (1=unarousable, 2=very sedated, 3=sedated, 4=calm and cooperative, 5=agitated, 6=very agitated and 7=dangerous agitation). | Posted | Median | Inter-Quartile Range | score on a scale | At postoperative hours 2(T1), 4(T2), 6(T3), 8(T4), 10(T5) and 12(T6). |
|
|
|
| Secondary | Postoperative Nausea and Vomiting. | Number of patients with postoperative nausea and vomiting in the first 12 postoperative hours. | Posted | Count of Participants | Participants | Postoperative nausea and vomiting during the first 12 postoperative hours. |
|
|
|
| 0 |
| 20 |
| 0 |
| 20 |
| 17 |
| 20 |
| EG001 | 0.9% Sodium-chloride | After anesthesia induction, patients who were randomized to the Placebo group received a bolus and infusion of 0.9% normal saline at the same rate as the Dexmedetomidine group until the end of surgery. In the case of intraoperative increment of the blood pressure and/or heart rate more than 25% from its baseline, fentanyl 1ug/kg was administered. 0.9% Sodium-chloride: The same dose used in the dexmedetomidine group (bolus and infusion). Fentanyl: Intraoperative fentanyl was given in case of 25% increment in the blood pressure and/or heart rate in comparison to baseline (previous anesthesia induction). Morphine Sulfate: Boluses of 3mg of intravenous morphine were given in the postoperative acute care unit. Once the pain score was equal or less than 3/10 a patient-controlled analgesia pumps were installed and the patients were discharged to their room. | 0 | 20 | 0 | 20 | 10 | 20 |
| Isolated Bradycardia | Cardiac disorders | Systematic Assessment | Isolated bradycardia |
|
| Hypotension associated with bradycardia | Cardiac disorders | Systematic Assessment | Hypotension and bradycardia combined |
|
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| D006946 | Hyperinsulinism |
| D002712 |
| Chlorides |
| D006851 | Hydrochloric Acid |
| D017606 | Chlorine Compounds |
| D007287 | Inorganic Chemicals |
| D017670 | Sodium Compounds |
| D000077324 | Crystalloid Solutions |
| D007552 | Isotonic Solutions |
| D012996 | Solutions |
| D004364 | Pharmaceutical Preparations |
| D010880 | Piperidines |
| D009022 | Morphine Derivatives |
| D009019 | Morphinans |
| D053610 | Opiate Alkaloids |
| D000470 | Alkaloids |
| D006572 | Heterocyclic Compounds, Bridged-Ring |
| D006576 | Heterocyclic Compounds, 4 or More Rings |
| D000072471 | Heterocyclic Compounds, Fused-Ring |
| D010616 | Phenanthrenes |
| D011084 | Polycyclic Aromatic Hydrocarbons |
| D011083 | Polycyclic Compounds |
| Hour 4 (T2) |
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| Hour 6 (T3) |
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| Hour 8 (T4) |
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| Hour 10 (T5) |
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| Hour 12 (T6) |
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| Hour 4 (T2) Pain at rest |
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| Hour 4 (T2) Pain at movement |
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| Hour 6 (T3) Pain at rest |
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| Hour 6 (T3) Pain at movement |
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| Hour 8 (T4) Pain at rest |
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| Hour 8 (T4) Pain at movement |
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| Hour 10 (T5) Pain at rest |
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| Hour 10 (T5) Pain at movement |
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| Hour 12 (T6) Pain at rest |
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| Hour 12 (T6) Pain at movement |
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| Hour 24 (T7) Pain at rest |
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| Hour 24 (T7) Pain at movement |
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| Hour 6 (T3) |
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| Hour 8 (T4) |
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| Hour 10 (T5) |
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| Hour 12 (T6) |
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