Conditioned Open-label Placebo (COLP) for Peri-operative Pain Management in Patients With Head and Neck Cancer

Background:

The opioid epidemic is a considerable problem in the United States, with more than 5 million Americans currently affected by opioid-related substance use disorders. While prescription medications may be thought of as safe and controlled, many opioid-naïve patients report continuing to take prescription opioids for over one year after surgery, and the majority of heroin users report starting with abuse of prescription opioids. At the same time, prescription opioids have more than doubled from 2001-2013 and multiple studies in other surgical specialties suggest that patients receive opioids in excess of the patient's peri-operative pain needs Prior efforts to battle this epidemic have included the increased use of multimodal analgesia, policies to limit the amount of opioids able to be prescribed at one time, and databases to track prescribing habits across health care facilities. While these have had some success, there is significant room for improvement.

Head and neck cancer (HNC) patients represent a unique population in that surgical resection often leads to significant peri-operative pain and disfigurement. A high proportion, up to 50% of these patients also suffer from psychiatric comorbidities. These factors inherently increase the risk of opioid dependence and studies have shown that chronic opioid use following surgery for HNC is associated with decreased disease free survival. Novel methods are needed to minimize opioid risks in this patient population.

Conditioning therapy aims to elicit a classically conditioned, or Pavlovian, response through consistent pairing of a medication with a neutral stimulus (i.e. an odor). Treatment involves reinforcement with simultaneous presentation of a characteristic odor with each dose of active and inactive medication. Prior studies have shown efficacy of conditioning therapy paired with placebo medication to decrease the total dose of active medications required for a clinical response including opioids for pain following spinal cord injury, stimulants for attention deficit hyperactivity disorder, and corticosteroids for psoriasis. Many of these have been performed as "open-label" studies, where patients were aware of group assignment and were informed when each placebo treatment was given.

These results suggest that patients with HNC may also benefit from conditioned open-label placebos by reducing total opioid consumption required for adequate pain control in the peri-operative setting and providing an innovative intervention to potentially decrease the risk of opioid dependence in this patient population.

Primary Objective:

Determine if the addition conditioned open-label placebo (COLP) to standard multimodal analgesia decreases baseline opioid consumption from post-operative day (POD) 2 to 5 in comparison to standard multimodal analgesia alone in patients with head and neck cancer.

Rationale:

Patients with head and neck cancer will be enrolled in this randomized, controlled, open-label trial. All study participants will receive standard multimodal analgesia, including opioids, and will have daily opioid consumption and pain severity documented following surgery. Patients in the COLP group will additionally receive conditioning (i.e. exposure to clove oil) with each active oxycodone dose on POD 1-5 and a scheduled placebo oxycodone paired with conditioning (i.e. exposure to clove oil) 3 times per day on POD 2-5. The chance in baseline opioid consumption from POD 2 to 5 will be compared between groups.

Secondary Objectives:

Determine if the addition conditioned open-label placebo (COLP) to standard multimodal analgesia leads to a reduction in pain severity following surgery and persistent opioid use at 6-months following surgery in comparison to standard multimodal analgesia alone in patients with head and neck cancer.

Rationale:

Following surgery, patients complete daily surveys on pain severity. The investigators will compare these pain scales between COLP and TAU groups to determine if there is a difference in pain severity between treatment groups. The investigators will also analyze long-term effects of the intervention with COLP. After the second week following surgery, opioid consumption will continue to be recorded by nursing (if inpatient) or with patient reported surveys (after discharge) through 6 months after surgery. While COLP may have immediate effects on opioid consumption during therapy, the goal of this aim is to determine if short-term therapy can result in long-term changes in behavior.

Inclusion criteria

• Patients receiving pre-operative evaluation for head and neck cancer in the Otolaryngology - Head and Neck Surgery Department at Johns Hopkins Hospital
• Scheduled for surgery for resection of and/or reconstruction following resection of a head and neck tumor between November 15, 2022 - May 15, 2024, with expected inpatient admission of at least 5 days after surgery.
• Age 18 years or older
• Ability to comprehend and willingness to participate in open-label conditioning portion of study regardless of study group assignment
• Ability to participate in study for 1 week prior to surgery and 6 months following surgery at time of enrollment

Exclusion criteria

• Past medical history of substance use disorder
• Chronic pain (defined as pain lasting >3 months) or chronic opioid use (for >3 months).
• Contraindication to receiving acetaminophen, ibuprofen, oxycodone, or hydromorphone
• New gabapentin prescription started <2 weeks prior to surgery
• Psychosis, delirium or other significant cognitive impairment preventing participation in study