Lidocaine-Ketamine for Management of Chronic Pain

Study Overview
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Brief Summary
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Chronic pain is defined as 'an unpleasant sensory and emotional experience associated with actual or potential tissues damage, or described in terms of such damage. It is estimated that 1 in 5 Canadians experience chronic pain Chronic pain is associated with the worst quality of life compared with other chronic diseases such as chronic lung or heart disease. Many of these problems are confined to a specific anatomic structure, and can be diagnosed and treated by injections, physical therapy, surgery, etc. Nonetheless, other individuals experience a more generalized pain. This condition has also resulted I depressed mood, bad relations with other people, sleep disturbances and poor quality of life. The condition is very difficult to manage, and multiple methods have been recommended. Therapeutic intravenous infusion may be considered as one of these methods. Patients come for infusions of non-opioid medications under medical supervision and in a scheduled fashion. Two most commonly used mediation are lidocaine and ketamine. Even though it is common to use multiple medications with complementary mechanisms of action to treat pain a combined lidocaine-ketamine infusion has never been studied Therefore, the purpose of this research study is to determine whether mixture of two medications (ketamine and lidocaine) infused intravenously 1 time per month for 6 months results in reduction of pain unpleasantness.

Official Title
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Ambulatory Infusion of Lidocaine and Ketamine for Management of Chronic Pain: An Observational Prospective Study

Conditions
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Chronic Pain Syndrome

Intervention / Treatment
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* Drug: Lidocaine
* Drug: Ketamine


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Age 18-90 Pain duration: > 3 months Multifocal and/or non-dermatomal neuropathic pain per Pain Diagram Failed medical management with at least 2 neuromodulation agents (e.g., gabapentinoids, antidepressants) Neuropathic component (>15 points on S-LANSS) Exclusion Criteria: Non-English speakers Refusal to sign informed consent Body weight > 100 kg Allergies to ketamine and/or lidocaine Known contraindications to ketamine use which include poorly controlled systemic illnesses: arterial hypertension, hyperthyroidism, ischemic heart disease, heart failure, psychiatric comorbidity (e.g., history of psychosis, schizophrenia, dissociative state). Known contraindication to lidocaine use which include current symptomatic or clinically significant brady- or tachyarrhythmia, systolic blood pressure <90 or >180 mmHg. Scheduled interventions targeting neuropathic pain: epidural injections, peripheral nerve blocks, Bier block, radiofrequency of dorsal root ganglia and peripheral nerves, additional lidocaine or ketamine infusions Newly added analgesic or neuromodulating medications, or recently performed interventions including lidocaine infusions (in the previous 3 months), or previous lidocaine/ketamine infusion in the previous 360 days. -Acute intoxication or active illegal substance abuse (excluding marijuana)

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 90 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Lidocaine-Ketamine Infusion<br>Lidocaine-Ketamine Infusions 1 time per month for 6 months. Pretreatment with Midazolam 1-3 mg IV Push or Subcutaneously and Clonidine 0.1 mg PO prior to infusion. | Drug: Lidocaine<br>* Initial dose of 5.0 mg/kg (based on actual weight, up to maximum dose 600 mg) over 45-60 minutes, followed by increases of 0.5 mg/kg each infusion based on tolerability of side effects, to a maximum total dose of 600 mg. The initial and subsequent dose may be increased or decreased by 20% based on patient comorbidities, age and previous experience<br>Drug: Ketamine<br>* initial dose of 0.25 mg/kg (based on actual weight) over 45-60 minutes (rounded to nearest 5 mg), increased by 10mg each infusion based on tolerability of side effects. The initial and subsequent dose may be increased or decreased by 20% based on patient comorbidities, age and previous experience<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Pain Unpleasantness Score | Relative change on Pain Unpleasantness Score. Moderate clinically important improvement is considered as 30% reduction. | Baseline, 1, 2, 3, 4, 5, 6 and 12 Months | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Pain Interference | Less Pain Interference measured by Short Form Brief Pain Inventory (SF-BPI) | Baseline, 1, 2, 3, 4, 5, 6 and 12 Months | 
| Neuropathic Pain | Less Neuropathic pain measured by Self-Administered the Leads Assessment of Neuropathic Symptoms and Signs (S-LANSS) | Baseline, 1, 2, 3, 4, 5, 6 and 12 Months | 
| Functional Status | Improved Functional Status measured by Patient Self-Efficacy Questionnaire (PSEQ) | Baseline, 1, 2, 3, 4, 5, 6 and 12 Months | 
| Emotional Status | Improved Emotional Status measured by Beck Depression Inventory (BDI), Pain Catastrophizing Scale (PCS) | Baseline, 1, 2, 3, 4, 5, 6 and 12 Months | 
| Cognitive Status | No change in Cognitive Status measured by Montreal Cognitive Assessment (MoCA) | Baseline, 1, 2, 3, 4, 5, 6 and 12 Months | 
| Quality of Life | Improved Quality of Life measured by Global Improvement and Satisfaction Score | Baseline, 1, 2, 3, 4, 5, 6 and 12 Months | 
| Health Care Utilization | Less Health Care Utilization measured by Self-report of number of physician, clinic visits for other reason, emergency department visit and hospitalizations | Baseline, 1, 2, 3, 4, 5, 6 and 12 Months | 
| Medication Use | Less Medication Use determined by Type and Dose of medications | Baseline, 1, 2, 3, 4, 5, 6 and 12 Months | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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lidocaine, ketamine, infusion