Clinical trial NCT02045680: RADOX' Reduced Abdominal Distension and Oxygen Delivery
Official title: Haemodynamic Changes and Oxygen Delivery in Patients Undergoing Laparoscopic Colorectal Surgery With Deep Neuromuscular Block
Study type: OBSERVATIONAL
Overall status: UNKNOWN
Conditions: Colorectal Cancer
Keywords: colorectal cancer
laparoscopy
neuromuscular block
oxygen delivery
Lead sponsor: Royal Surrey County Hospital NHS Foundation Trust
Sponsor class: OTHER
Collaborators: name: Royal Surrey County Hospital NHS Foundation Trust
name: Merck Sharp & Dohme LLC
First posted: 2014-01-27
Enrollment: 30
Sex: ALL
Minimum age (years): 18
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Observational model: CASE_ONLY
Time perspective: PROSPECTIVE
Sampling method: NON_PROBABILITY_SAMPLE
Study population: Patients undergoing elective laparoscopic colorectal surgery over the age of 18years

Brief summary: The use of laparoscopic surgery is continuing to increase in colorectal resection and expected reach 80% in the next 10 years. Although laparoscopic (keyhole) or minimally invasive surgery can lead to faster recovery it can also put significant stresses on the patient's heart and cause fluctuations in blood pressure due to the extreme headdown positioning and abdominal insufflation of carbon dioxide gas.

We have performed several surgical cases under deep neuromuscular block and this has allowed surgery to operate at lower abdominal pressures (from 14 down to 8 mmHg). This put less strain on the heart and allowed higher cardiac outputs.

This study will look at whether deep neuromuscular block is beneficial for patients by

1. Increasing oxygen delivery, measured using oesophageal doppler monitoring of cardiovascular variables intraoperatively
2. Allowing surgery at lower abdominal insufflation pressures if they have a deep block
3. Reducing patient's analgesic requirements postoperatively in recovery and at 4 hours

Detailed description: Design pilot study, single arm controlled study Hypothesis Deep neuromuscular blockade provided intraoperatively for patients undergoing laparoscopic colorectal surgery will have an increase in oxygen delivery as measured by haemodynamic data using oesophageal doppler. Secondary hypotheses Deep muscular blockade will provide the same surgical operating conditions at lower abdominal inflation pressures. The patients will experience less pain postoperatively due to less forced distension of the peritoneum demonstrated by less analgesic requirements. Patients will therefore spend less time in recovery and be able to mobilise earlier.Participants and Recruitment Patients will be assessed in preassessment clinic by a clinical nurse specialist for eligibility and provided with a patient information sheet. On the morning of planned surgery patients eligible who wish to be included in the study will be consented for the study in accordance with the International GCP guidelines by the anaesthetic researcher, and given a form to sign.

Sample size We estimate that 30- 40 participants will be required to demonstrate and statistical significance. Our unit carries out approximately 4 laparoscopic colorectal resections per week. Assuming that 30% of patients may not consent to participation or will not meet inclusion criteria we predict it will take less than 6- 12 months to enrol the necessary number of participants.

Preoperatively Participants will already be on the standardised Enhanced Recovery Programme. Intraoperatively An oesophageal Doppler probe will be inserted orally or nasally (standard practice in our unit for haemodynamic monitoring) to titrate fluids using stroke volume optimisation protocol (as per normal practice). Cardiovascular variables (heart rate, stroke volume, blood pressure and corrected flow time) will be collected prior to commencing surgery to provide baseline data set and throughout the procedure in accordance with routine observations under anaesthesia, which will together calculate oxygen delivery. Abdominal pressure will be measured continuously during insufflation and maintenance of the pneumoperitoneum (as per standard practice). Abdominal insufflation pressure will be gradually reduced as low as possible but ensuring the same standard of surgical access and operating conditions. Following completion of surgery the neuromuscular blockade will be reversed using a standardised dose of sugammadex 4mg/ kg according to the manufacturers guidelines according to neuromuscular monitoring returns a double burst stimulus to normal.

Postoperatively Immediately in the recovery area analgesia will be provided in accordance with enhanced recovery guidelines. Morphine Sulphate will be titrated to effect and a patient controlled analgesia pump given to the patient, which records quantity and demands of morphine used. .The standard enhanced recovery pathway will then be continued until discharge home.

Outcome measures Data collection for the primary endpoint will be collected from the haemodynamic data captured in theatre using the anaesthetic chart recording and oesophageal doppler. Data for the secondary endpoints will be pain scores in recovery and at 4 hours post operatively. Other secondary endpoints will be collected as standard by the Enhanced Recovery Nurse. These will include: length of operation, time spent in recovery area after surgery, time taken until mobilisation.

Eligibility criteria: Inclusion Criteria:

* Patients over 18 years of age
* Planned elective major abdominal surgery for laparoscopic resection of colorectal cancer on the enhanced recovery programme with use of neuromuscular block Capacity to consent

Exclusion Criteria:

* Known oesophageal disease as a contraindication to using oesophageal Doppler probe
* Known allergy/hypersensitivity to rocuronium, sugammadex or other drugs to be given in protocol.
* Significant neuromuscular disease Insulin dependent diabetes with or without known autonomic dysreflexia
* Any known dysautonomia

Primary outcomes:
measure: Improved tissue oxygen delivery
timeFrame: Duration of surgery
Secondary outcomes:
measure: Reduction in patient pain scores following surgery
timeFrame: first 48 hours after surgery
measure: Time spent in recovery until fit for discharge to the wards following surgery
timeFrame: Number of minutes in recovery before being discharged
measure: Time taken for patient to first mobilise following surgery
timeFrame: First mobilisation following surgery -
Other outcomes:
Locations:
city: Guildford
country: United Kingdom
facility: Royal Surrey County Hospital
state: Surrey
Study officials:
affiliation: Royal Surrey County Hospital, Guildford, UK
name: michael Scott, MB ChB
role: PRINCIPAL_INVESTIGATOR
References:
citation: Levy BF, Fawcett WJ, Scott MJ, Rockall TA. Intra-operative oxygen delivery in infusion volume-optimized patients undergoing laparoscopic colorectal surgery within an enhanced recovery programme: the effect of different analgesic modalities. Colorectal Dis. 2012 Jul;14(7):887-92. doi: 10.1111/j.1463-1318.2011.02805.x.