A Phase 3 interventional study of Ketamine and Dexamethasone in Post-operative Pain, sponsored by The University of Hong Kong. Completed at 1 site in Hong Kong. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2020-11-09.
Sponsored by The University of Hong Kong · Phase 3, Interventional, and Treatment
Low dose sub-anaesthetic dose of ketamine has been shown to reduce postoperative pain and analgesic consumption. However, due to the heterogeneous results, the standard dosing regimen has not been available. Recently, its effect in postoperative outcomes and the development of post-operative surgical pain has also been suggested.
Ketamine has been shown to reduce post-operative early inflammation especially serum IL-6. Therefore, study in its effects in post- operative pain and outcomes due to inflammation is suggested. Only few clinical studies assessed post-operative pain are related to inflammation.
Pain after third molar surgery is a good model of postoperative acute inflammatory pain.
A previous study showed that there was no benefit to administer ketamine before or after oral surgery for pain relief. However, other studies demonstrated that ketamine used as sedative or local ketamine in third molar surgery could reduce postoperative dental pain, swelling and trismus.
Postsurgical facial oedema is difficult to quantify accurately as it is three dimensional. Over the years, various measurement techniques have been tried to measure oedema objectively. These include direct linear measurement using tape or flexible rulers across fixed soft tissue landmarks, standardized stereophotographic measurements, computerized tomography (CT), magnetic resonance imaging (MRI), ultrasonography (US) and three - dimensional (3D) laser scanning. Recently, three dimensional image reconstructions using a reversed engineering technique has been developed and is used in the manufacturing industry. This technology could be applied in a clinical setting for monitoring soft tissue changes.
In this study, the investigators will aim to study the use of sub-anaesthetic dose of ketamine in post-operative dental pain and recovery outcomes.
The investigators hypothesise that post-operative pain after Bilateral Third Molar under General Anaesthesia is less in patients receiving sub-anaesthetic does of ketamine before incision. The magnitude of this effect will be compared with a positive control group (dexamethasone) as well as a placebo group (normal saline). Further, the investigators aim to demonstrate whether ketamine can reduce post-operative facial oedema and other post-operative outcomes.
3 groups:
Ketamine group:
Dexamethasone group:
Process:
After obtaining informed consent, patient will be randomly allocated to one of three groups. HADS and SF-36 questionnaires will be completed by the patients on admission. Blood for serum IL-6 and TNF - α will be taken. 3D laser scanning of the face will be performed.
The patients will not receive any premedication and will follow other routine preoperative preparation. Patients will be educated to use the Numerical Pain Rating Scale for pain assessment, where 0= no pain and 10 the most severe pain. P deletion test and mini-mental test will be done at ward before operation.
Before induction, ketamine 0.5mg/kg, dexamethasone 8mg or normal saline of same volume will be administrated intravenously according to the study group allocated. Induction of anaesthesia will be achieved according to a standard protocol. Regional block with 2% lignocaine with 1 in 80000 adrenaline will be performed by surgeon before start of the procedure. The surgery will be started once the anaesthesia is effective.
The patients will be transferred to the recovery area for monitoring for at least 30 minutes postoperatively. The vital signs including blood pressure, pulse and SpO2 and the Ramsay sedation score (RSS) will be assessed every 5 minutes. Pain score (NRS) will be recorded every 15 minutes. The patients will be sent back to general ward when the parameters are normal. P deletion test will be done from postoperative hour 2 in the general ward until the performance is at least the same as that before operation. Mini-mental test will be done at 2 hours postoperatively. Hourly blood pressure, pulse, SpO2 and pain score (NRS) will be performed for 4 hours. Pain score (NRS) will be assessed 4 hourly afterward. Quality of recovery will be assessed after operation with Chinese QoR. Serum IL-6 and TNF-α will be taken at postoperative 6th hour and 16th hour. Paracetamol 1 g three times daily and tramadol 50mg three times daily as required will be prescribed postoperatively.
The patients will be discharged home at postoperative day 1 if the discharge criteria are met. 3D laser scanning of the face will be performed before they are discharged. They will be asked the degree of satisfaction of the operation . Paracetamol 1 g three times daily and tramadol 50mg three times daily as required will be prescribed on discharge. A diary will be given to the patient. From postoperative day 1 to day 3, at each morning, average pain score (NRS), analgesic consumption and side effects will be marked on the diary by the patient. At the 3rd month after operation, the severity and nature of pain at the surgical sites will be asked over phone. The patients will be asked to go to the Oral \& Maxillofacial Surgery out-patient clinic at the Prince Philip Dental Hospital on postoperative day 2 for 3D laser scanning of the face.
5,093 studies on the registry are indexed under Pain, Postoperative; 1,140 are open to participants now.
This study's enrollment of 150 is above the median of 75 across 4,344 interventional studies indexed under Pain, Postoperative.
Browse Pain, Postoperative studies →The University of Hong Kong is the lead sponsor of 1,262 studies on the registry; 340 are open to participants now.
Of its 8 completed or terminated interventional studies of FDA-regulated products, 0 (0%) have results posted.
Counted across the registry records on this site, refreshed daily.
Exclusion Criteria:
Single dose of intravenous ketamine 0.5mg/kg before incision
Drug: Ketamine
Single dose of intravenous dexamethasone 8mg before incision
Drug: Dexamethasone
Single dose of intravenous normal saline before incision
Drug: Normal Saline
Pain scores as numerical rating scale after operation
Time frame: Every 15 minutes for 1 hour after operation, every 4 hourly at the first 24 hour after operation, and at postoperative 48th and 72rd hour
Facial oedema measured by using 3D laser scanning of the face
Time frame: Before operation and at post-operative day1 and day 2
Number of patients having adverse effects
Time frame: Postoperative day 1 to day 3
Serum IL-6 and TNF - α
Time frame: Before operation and at postoperative 6th and 16th hour
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The University of Hong Kong