Epidural Methadone in Healthy Volunteers

S

simon.haroutounian

Status and phase

Completed
Early Phase 1

Conditions

Pain, Acute

Treatments

Drug: Morphine Sulfate
Drug: Methadone hydrochloride

Study type

Interventional

Funder types

Other

Identifiers

NCT03525509
201802099

Details and patient eligibility

About

Epidurally administered opioid pain medications are important tools for postoperative pain control, but each agent has its own limitations. Methadone's properties suggest that it may provide a long duration of pain control with minimal side effects related to spread to the brain or absorption into the blood stream. In this study, the investigators aim to compare the relative pain relieving effects, markers of side effects, and concentrations in the blood of epidurally administered methadone as compared to another long-acting opioid which is commonly administered epidurally, morphine.

Full description

Acute postoperative pain control remains a major challenge in healthcare, with a need to balance analgesic effectiveness, patient safety, and cost. Excellent analgesia is a universal clinical imperative, but our current approaches are often inadequate. Epidural opioids can be useful tools, but each carries its own strengths and limitations. Bolus morphine is long lasting but exhibits rostral spread in the cerebrospinal fluid, which raises risks of adverse effects, particularly late-onset respiratory depression. Lipophilic opioids such as fentanyl and sufentanil exhibit selective segmental analgesia but are of short duration due to systemic absorption. As such, they require continuous epidural administration via an indwelling epidural catheter and a pump (patient-controlled or continuous infusion), which has implications for nursing, pain management services, and hospital cost. Methadone's physico-chemical properties suggest that epidural methadone administration would be ideal in providing long-duration analgesia with fewer of the adverse effects seen with medications like morphine. The aim of this study is to compare the effects of two medications given epidurally: morphine and methadone. We will do so using a randomized, double-blinded, crossover design study. During each of two study visits, participants will receive a single epidural bolus of either morphine or methadone. We will examine the ability of the medication to blunt pain from heat or pressure using quantitative sensory testing at both the dermatome of injection (leg) and a distant dermatome (face); in doing so, we will demonstrate relative segmental versus supraspinal or systemic opioid activity. Additionally, we will assess signs and symptoms of supraspinal opioid activity, which may predispose to adverse effects, and blood concentrations of each medication. Each of the aforementioned measurements will be conducted at multiple points over a 24 hour period. Following a washout period, patients will return for a second visit, at which time the protocol will be repeated using the other medication.

Enrollment

13 patients

Sex

All

Ages

18+ years old

Volunteers

Accepts Healthy Volunteers

Inclusion criteria

  1. Age ≥18;
  2. Body mass index between 18.5 and 30
  3. Good general health with no remarkable medical conditions;
  4. Able and willing to provide informed consent.

Exclusion criteria

  1. Known history of hepatic, renal, and cardiac disease;
  2. Known history of diabetes mellitus;
  3. Chronic pain;
  4. A skin or spine condition preventing safe epidural catheter placement;
  5. Current pregnancy or lactation;
  6. Known coagulopathy or ongoing anticoagulant use which contraindicates epidural catheter placement;
  7. Known allergic reactions to opioids or local anesthetics;
  8. History of current or prior substance use disorder or positive screen using the 4-question Simple Screening Instrument for Substance Abuse (SSI-SA).

Trial design

Primary purpose

Treatment

Allocation

Randomized

Interventional model

Crossover Assignment

Masking

Triple Blind

13 participants in 2 patient groups

Epidural methadone
Experimental group
Description:
A single 4mg epidural bolus of methadone hydrochloride
Treatment:
Drug: Methadone hydrochloride
Epidural morphine
Active Comparator group
Description:
A single 4mg epidural bolus of morphine sulfate
Treatment:
Drug: Morphine Sulfate

Trial contacts and locations

1

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Data sourced from clinicaltrials.gov

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