Magnesium Sulfate Improves Postoperative Analgesia in Laparoscopic Gynecologic Surgeries

Pain, Postoperative Clinical Trial

— Magnesium  

Official title:

Magnesium Sulfate Improves Postoperative Analgesia in Laparoscopic Gynecologic Surgeries: a Double-blind Randomized Controlled Trial.

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT02508857
• Other study ID #: NP0792010
• Status: Completed
• Phase: Phase 4
• First received: April 27, 2015
• Last updated: July 24, 2015
• Start date: January 2010
• Est. completion date: January 2014

Study information

• Verified date: July 2015
• Source: Instituto do Cancer do Estado de São Paulo
• Contact: n/a
• Is FDA regulated: No
• Health authority: Brazil: Ethics Committee
• Study type: Interventional

Clinical Trial Summary

Magnesium sulfate has been reported to improve postoperative pain, but evidence is still controversial. Some studies demonstrated benefits while others concluded that there is no efficacy. Aim: the aim of the study was to compare the effect of intravenous infusion of magnesium sulfate to ketorolac during laparoscopic gynecologic oncology surgeries. Methods: We designed a double-blind randomized controlled trial that compared intravenous magnesium sulfate to ketorolac and saline solution in postoperative pain, morphine consumption and opioid related side effects.

Description:

Sixty American Society of Anesthesiologists (ASA) I-II patients undergoing laparoscopic gynecologic oncology surgeries are enrolled in this study.

Patients were randomized to receive either intravenous ketorolac 30 mg in bolus followed by saline infusion (Group K), intravenous magnesium sulfate 20 mg/kg in bolus followed by magnesium 2 mg/kg/h (Group M) or intravenous saline solution 20 ml in bolus followed by saline infusion during the entire procedure (Group S). The study use a double-blinded methodology with random allocation into three groups using sealed opaque envelopes numbered 1 to 60, containing the instructions for the study. An independent anesthesiologist not involved in the study prepared the solutions and an observer who was also blinded to the patient's group records the data.

In the preoperative visit, patients that agree to participate are instructed about numeric rating scale (NRS) and the Patient Controlled Analgesia (PCA) device.

The night before surgery, patients are premedicated with midazolam 7.5 mg per os. Upon arrival in the operating room, monitoring devices (ECG, non-invasive arterial pressure, capnography, pulse oximetry) and a bispectral index (BIS) monitor are established. An intravenous line is secured, general intravenous anesthesia is induced with target infusion remifentanil and propofol. Cisatracurium besylate (0.5 mg/kg) is given to facilitate tracheal intubation and controlled ventilation is adjusted to maintain normocapnia with a 50% oxygen fraction administered. Then, the study medications are administered in bolus during 20 minutes, followed by continuous infusion of the specific solution, according to the study group to which the patient belonged, as described before.

At the end of the surgery, the study drugs are discontinued before the patient is extubated. If patients present clinical signs of residual neuromuscular blockade, they receive atropine 0.01mg/kg and neostigmine 0.04mg/kg. All patients receive dipyrone 30 mg/kg in bolus and a PCA device is connected to the intravenous line before discharge to the Post Anesthesia Care Unit (PACU). PCA solution containing morphine 1mg/ml in 0.9% saline, is set to give bolus of 2ml (2mg) with a 10min lockout interval.

In the postoperative period, the anesthesiologist responsible for the study question the intensity of pain in the patients using two methods: numerical rating scale (NRS) (0=no pain and 10=worst pain imaginable) and descriptive verbal scale (no pain, mild pain, moderate pain or severe pain - at emergence from anesthesia and after 20, 30 and 60 minutes, while in PACU. Patients are instructed to use the PCA device whenever they feel pain. Agitation and Sedation are monitored using RASS scale and patient is considered sedated if RASS ≤ -1. Episodes of nausea, vomiting, respiratory depression or pruritus are also recorded.

Patients are discharged to the ward after 60 minutes, if minimum criteria for discharge are met.

Time (in minutes) to the first morphine rescue, and total consumption of morphine in PACU are registered. After 24 hours, pain intensity score, total morphine consumption and side effects are also recorded and PCA device is disconnected.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 60
• Est. completion date: January 2014
• Est. primary completion date: January 2014
• Accepts healthy volunteers: No
• Gender: Female
• Age group: 18 Years to 65 Years

Eligibility

Inclusion Criteria:

• ASA I-II female patients undergoing laparoscopic gynecologic oncology surgeries, for treatment of cancer

Exclusion Criteria:

• chronic pain, cardiovascular, hepatic or renal disease, neuromuscular disease, diabetes, drugs or alcohol abuse, obesity, patients treated with calcium channel blockers or magnesium, allergy or contraindication to any of the drugs studied.

Study Design

Allocation: Randomized, Endpoint Classification: Efficacy Study, Intervention Model: Parallel Assignment, Masking: Double Blind (Subject, Caregiver, Investigator), Primary Purpose: Treatment

Related Conditions & MeSH terms

• Pain, Postoperative

Intervention

Drug:
• Ketorolac
Patients received intravenous injection of ketorolac (30 mg) in bolus; then, saline solution was continuously infused during the entire procedure (Group K),
• Magnesium
Patients received intravenous magnesium sulfate (20 mg/kg) in bolus, then magnesium sulfate (2 mg/kg/h) was continuously injected during the procedure (Group M)
• Saline solution
intravenous saline solution (20 ml) was injected in bolus, followed by continuous infusion of saline solution during the entire procedure (Group S).

Locations

Country	Name	City	State
Brazil	Angela Maria Sousa	Sao Paulo	São Paulo

Sponsors (1)

Lead Sponsor	Collaborator
Instituto do Cancer do Estado de São Paulo

Country where clinical trial is conducted

Brazil, 

References & Publications (2)

Albrecht E, Kirkham KR, Liu SS, Brull R. Peri-operative intravenous administration of magnesium sulphate and postoperative pain: a meta-analysis. Anaesthesia. 2013 Jan;68(1):79-90. doi: 10.1111/j.1365-2044.2012.07335.x. Epub 2012 Nov 1. Review. — View Citation

De Oliveira GS Jr, Castro-Alves LJ, Khan JH, McCarthy RJ. Perioperative systemic magnesium to minimize postoperative pain: a meta-analysis of randomized controlled trials. Anesthesiology. 2013 Jul;119(1):178-90. doi: 10.1097/ALN.0b013e318297630d. Review. — View Citation

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	postoperative pain	intensity of pain in the patients using numerical rating scale (NRS) (0=no pain and 10=worst pain imaginable) and descriptive verbal scale (no pain, mild pain, moderate pain or severe pain	24 hours	No
Secondary	time to first morphine rescue	Time (in minutes) to the first dose of morphine	first 6 hours	No
Secondary	morphine consumption	total consumption of morphine in PACU	60 minutes	No