Clinical Trial Details
— Status: Recruiting
Administrative data
| NCT number |
NCT04601961 |
| Other study ID # |
UW 20-022 |
| Secondary ID |
|
| Status |
Recruiting |
| Phase |
N/A
|
| First received |
|
| Last updated |
|
| Start date |
March 4, 2020 |
| Est. completion date |
March 31, 2024 |
Study information
| Verified date |
February 2023 |
| Source |
The University of Hong Kong |
| Contact |
Michael G. IRWIN, M.B. Ch.B |
| Phone |
(852)2255 3303 |
| Email |
mgirwin[@]hku.hk |
| Is FDA regulated |
No |
| Health authority |
|
| Study type |
Interventional
|
Clinical Trial Summary
More than 80% of patients with cancer will be exposed to anaesthesia at some point in their
treatment. There is increasing evidence that perioperative events, including the type of
anaesthesia drugs utilised, have an impact on cancer recurrence and metastases.
Although potentially and theoretically curative, surgical resection, manipulation and trauma
may disseminate tumour cells and reduce immunity. There have been a number of suggestions as
to why cancer may be, paradoxically, worsened by surgery and what methods may be used to
mitigate this. One of these is propofol based total intravenous anaesthesia (TIVA), whereby
the traditional inhalational anaesthetic drugs are avoided. Commonly used inhalational drugs,
such as sevoflurane and desflurane, are pro-inflammatory.
Propofol, however, has anti-inflammatory and anti-oxidative properties, induces apoptosis and
has specific inhibitory effects on tumour cell growth in vitro. Laboratory investigations,
animal models, retrospective clinical studies and initial clinical research are producing
evidence that inhalational anaesthesia facilitates tumour recurrence and metastasis, whilst
TIVA can prolong survival.
This randomised, controlled trial will look at the effects on DNA damage and biomarkers of
immunity and inflammation of inhalational anaesthesia versus TIVA in patients undergoing
surgery for hepatocellular carcinoma, a common tumour in the Southern Chinese population, for
whom surgery is potentially-curative. It will focus on subjects undergoing open and
laparoscopic hepatectomy and investigate changes in biomarkers of inflammation, immunity and
gene expression from the patients' blood samples taken before, during and after surgery.
Patients will also be followed-up for cancer recurrence, morbidity and five-year mortality.
Results could represent a breakthrough in knowledge of how anaesthetic agents impact the
results of cancer surgery, and have important implications for a more disease- sensitive
approach to improving management and outcomes in these patients.
Description:
Pre-operative care
Pre-operative assessment will be performed at the preadmission clinic or at the general ward.
Patients will be fasted for intake of solid food for 6 hours and clear liquids for 2 hours.
Sedative premedication will not be prescribed.
Anaesthesia and intraoperative care
SEVO Group
Patients from the SEVO group will be anaesthetized according to the following protocol:
On arrival at the operation theatre, an intravenous cannula will be inserted. Standard
monitoring with pulse oximeter, non-invasive blood pressure, and three-lead electrocardiogram
will be applied prior to induction. Non-invasive blood pressure (NIBP) will be checked at
least every 5 minutes throughout the operation. An arterial line may be inserted at the
discretion of the anaesthetist before or after induction, with invasive blood pressure
monitoring in lieu of NIBP if deemed necessary. Additional intravenous cannulas or central
lines may also be inserted to facilitate fluid therapy, measure the central venous pressure
or administer drugs, also at the discretion of the attending anaesthetist.
Anaesthesia will be induced with titrated, manual propofol injection of 1-2 mg.kg-1.
Remifentanil infusion will be given for analgesia at a rate of 0.1 - 0.35 mcg.kg.min-1 as
required, according to haemodynamic parameters. Cisatracurium 0.15 mg.kg-1 or atracurium 0.5
mg.kg-1 will be used for muscle relaxation. Tracheal Intubation will be performed after
induction of general anaesthesia. General anaesthesia monitoring will be used. Sevoflurane at
0.5- 1 MAC, air and oxygen will be used for maintenance of general anaesthesia. Processed EEG
(BIS™) will be utilized to monitor depth of anaesthesia, aiming at a BIS value of 40-60. FiO2
will be kept between 35-50% to maintain and SaO2 of > 95%. Further muscle relaxants can be
given during the operation if required.
In accordance with British consensus guidelines on intravenous fluid therapy for Adult
Surgical Patients [22], intraoperative fluid or blood loss will be initially replaced with
balanced crystalloid solution, preferably Plasmalyte A (a physiologically balanced
electrolyte solution similar to extracellular fluid), for up to 20% of body volume, with
additional fluid replacement with colloid or crystalloid at the discretion of the
anaesthetist. Intravenous phenylephrine, ephedrine or fluid administration may also be given
for management of hypotension. Intravenous anti-hypertensive agents such as beta blockers
(e.g. esmolol, labetalol) and glyceryl trinitrate can be given if hypertension occurs.
Patients will receive standardized opioid analgesia of 0.1 mg.kg-1 intravenous morphine
intra-operatively followed by patient-controlled analgesia (PCA) morphine post-operatively,
as well as local anaesthesia (0.5% levobupivacaine) injected in the areas of surgical
incision during wound closure for pain control.
Forced air warming blankets will be used with the aim of keeping a core temperature of
35.5-37.5 degrees Celsius. Ondansetron 4mg IV will be given 30 minutes before end of surgery.
Sevoflurane and remifentanil infusion will be switched off at the end of the procedure.
Reversal of muscle relaxation can be achieved if required with neostigmine 50 mcg.kg-1 IV and
atropine 20 mcg.kg-1 IV. Patients will subsequently be transferred to the post anaesthetic
care unit (PACU) for monitoring for at least 30 minutes.
TIVA Group
Patients in the TIVA group will be anaesthetized according to the following protocol:
Monitoring and other anaesthetic procedures including the management of hypertension and
hypotension will be the same as SEVO group. Induction and maintenance of general anaesthesia
will be conducted using total intravenous infusion of propofol. Sevoflurane will not be used,
and oxygen and air would be given to provide a FiO2 of 30-50%.
Target controlled infusion (TCI) with a modified Marsh effect site model (Fresenius Kabi)
will be used for induction and maintenance of general anaesthesia and titrated to effect. The
usual effect site concentration is 1.5-3 mcg.ml-1 and BIS monitoring will also be used to
produce a value of between 40-60. As with patients in the SEVO group, remifentanil will be
infused at a rate of between 0.1-0.3 mcg.kg.min-1.
Post-operative care for both groups In the recovery room after surgery, numerical rating pain
score (NRS) will be used to assess level of pain. Patients will select a whole number (0-10
integers) that best reflects the intensity of his/her pain, in which 10 represents the
maximal imaginable pain. Boluses of 2 mg intravenous morphine will be given every 5 minutes
until the numerical rating scale (NRS) is less than or equal to 4/10. A patient controlled
analgesia (PCA) machine will then be connected. The machine will be configured to give 1 mg
of morphine whenever the patient demands with the lockout duration set to 5 minutes. No
background infusion will be given and the maximum dose limit will be 0.1 mg.kg-1 per hour of
morphine.
On post-operative day 1, when the patient resumes a fluid diet, oral celecoxib 200 mg will be
given twice daily for 3 days.
Whilst on PCA morphine, the patient's respiratory rate, oxygen saturation (SpO2) and sedation
score will be monitored every hour. Heart rate and blood pressure will be checked every 4
hours. NRS pain scores at rest and during cough/movement, cumulative PCA morphine doses, and
number of PCA demands/goods delivered, and side effects (nausea, vomiting, dizziness,
hypotension, desaturation) will be recorded every 4 hours. Patients will be assessed by a
"pain team" every day to determine sufficiency of analgesia, as per usual practice.
Patients will be kept on PCA morphine for at least 2 days. If NRS pain scores during cough/
movement on postoperative day 2 are less than or equal to 3/10, PCA morphine will be stopped.
PCA morphine will be continued if NRS is equal or greater than 4, or if the patient remains
on a high PCA use. Assessment for analgesia will be conducted daily. Evaluation for
complications will be required if NRS pain score is 4 or higher on postoperative day 5. The
patient will be further managed at the discretion of the anaesthetist.
After PCA morphine has been withdrawn, NRS pain scores at rest and during cough/ movement, as
well as the dose and frequency of rescue analgesia used will be charted once a day until
discharge.
