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The effectiveness of Transcutaneous Electrical Nerve Stimulation (TENS) to reduce pain scores for patients with acute back pain in an ambulatory emergency department (ED) population will be examined in this dual-center, cluster randomized, controlled, open-label study.
Back pain is one of the top 5 most common ED presenting complaints, accounting for approximately 3% of all ED visits. It is estimated that 85% of these patients will leave the ED with a non-specific diagnosis, such as mechanical low back pain, and will recover within 4-6 weeks. Unfortunately, treatment for these patients is limited and often consists of NSAIDs, acetaminophen, and opioids if in significant pain.
TENS is a non-pharmacological option for the treatment of pain. The mechanism of its effect is based on the gate control theory of pain; stimulation of large, myelinated fibers reduces transmission of pain through smaller, nociceptive C-fibers through inhibitory actions of interneurons. It is very safe, with very few reported adverse effects and a short list of contraindications.
In 2015, a Cochrane review examined the benefit of TENS in acute pain, which was defined as less than 12 weeks. Their review demonstrated tentative evidence of benefit in reducing pain, although due to the small sample sizes of the encompassing trials and the inability to blind, definitive conclusions are impossible.
Research question: "In patients in the ED triage area,18 years of age or older with acute or acute-on-chronic back pain for less than three weeks, does 30 min of transcutaneous electrical nerve stimulation reduce pain scores as compared to standard care alone?"
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| TENS Arm | Experimental | Participants randomized to receive treatment with TENS in addition to standard care. |
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| Control Arm | No Intervention | Participants randomized to not receive treatment with TENS. These participants receive standard care only. |
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Transcutaneous Electrical Nerve Stimulation (TENS) | Device | TENS pads will be applied in a frame pattern around the area of maximal pain, as pointed out by the patient. The pads will be no more than 6 cm and no less than 3 cm away from the subjective area of maximal pain. The frequency of the TENS machine will be set to 100 Hz and the patient will be instructed on how to increase and decrease the amplitude based on their comfort. The patient will also be instructed on how to turn off the machine if they wish for any reason. Research assistants will be standing by during the intervention period to intervene if the patient requires assistance with the device. |
| Measure | Description | Time Frame |
|---|---|---|
| Pain Score Difference | Pain score as a primary outcome will be assessed by determining the difference in VAS between T0 and T60. VAS is a validated tool for measuring subject reports of pain in a variety of patient care settings. T60 was chosen as the primary endpoint as this was thought to allow sufficient time for standard care (ie. pharmacotherapy) to take effect. A clinically significant reduction of pain was defined as 30% on VAS, based on prior literature. | Change from baseline score at 60 minutes of study participation. |
| Measure | Description | Time Frame |
|---|---|---|
| Pain score at T30 | As a secondary outcome, pain score reduction at T30 will be assessed. This is to determine how effective TENS is at reduction pain immediately when finishing treatment. Similarly, a 30% reduction of pain score is considered clinically significant. No further assessment points will be used due to the variability of wait-times and high likelihood of loss to follow-up with later assessment points. We currently do not have capacity for telephone follow-up the next day. |
| Measure | Description | Time Frame |
|---|---|---|
| Adverse effects | Adverse effects will also be gathered, including skin irritation and pad removal due to discomfort. Any other suspected adverse events will be recorded and reported in a narrative format. | Immediately after intervention. |
Inclusion Criteria:
Exclusion Criteria:
Back pain "red flags" on initial history. These include:
History of spinal cord injury.
Epilepsy.
Abnormal triage vital signs:
Active pregnancy (patient warning on product label)
Canadian Triage and Acuity Scale (CTAS) level 1-2.
Implanted pacemaker or neurostimulation device.
TENS unit in use by another patient at time of screening
Wound, abrasion, rash over where TENS pads will be placed.
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| Name | Affiliation | Role |
|---|---|---|
| Samuel Brophy | Island Health | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Royal Jubilee Hospital | Victoria | British Columbia | V8R 1J8 | Canada |
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| Type | Date | Date Unknown |
|---|---|---|
| Release | Oct 12, 2023 | |
| Reset | Apr 11, 2024 | |
| Release | May 6, 2024 | |
| Reset | Sep 18, 2024 |
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| Release Date | Unrelease Date | Unrelease Date Unknown | Reset Date | MCP Release Number |
|---|---|---|---|---|
| Oct 12, 2023 | Apr 11, 2024 | |||
| May 6, 2024 |
| ID | Term |
|---|---|
| D001416 | Back Pain |
| D063806 | Myalgia |
| D059787 | Acute Pain |
| D017116 | Low Back Pain |
| D004630 | Emergencies |
| ID | Term |
|---|---|
| D010146 | Pain |
| D009461 | Neurologic Manifestations |
| D012816 | Signs and Symptoms |
| D013568 | Pathological Conditions, Signs and Symptoms |
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| ID | Term |
|---|---|
| D004561 | Transcutaneous Electric Nerve Stimulation |
| ID | Term |
|---|---|
| D004599 | Electric Stimulation Therapy |
| D013812 | Therapeutics |
| D026741 | Physical Therapy Modalities |
| D012046 | Rehabilitation |
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| After 30 minutes of study participation. |
| Opioid requirements | A further secondary outcome is opioid requirements while in the ED, calculated by Oral Morphine Equivalents (OMEs). The duration of 8 hours or at time of discharge was determined to be an adequate length of time to allow for appropriate up-titration of opioids to achieve adequate pain treatment. Other forms of analgesia (ie. NSAIDs and acetaminophen) will not be tallied, due to the challenge of reliably interpreting the data - most patients have taken some form of over-the-counter analgesia prior to their ED encounter and different NSAIDs are often used without a reliable way of determining comparable such as OMEs for opioids. | After 60 minutes of study participation. |
| ED Return Visits | Return visits to the ED within 2 weeks will also be compared between groups, specifically analyzing the proportion of repeat presentations with a triage complaint of "back pain." This will be done by accessing the EMR of each patient in the trial through by the PI or CIs. Presentations to all EDs in the Island Health region are available upon accessing our local EMR (PowerChart). No further details other than initial triage complaint will be collected on these repeat visits. | Within 2 weeks of study participation. |
| Sep 18, 2024 |
| D009135 | Muscular Diseases |
| D009140 | Musculoskeletal Diseases |
| D009468 | Neuromuscular Diseases |
| D009422 | Nervous System Diseases |
| D059352 | Musculoskeletal Pain |
| D020969 | Disease Attributes |
| D010335 | Pathologic Processes |
| D000698 |
| Analgesia |
| D000760 | Anesthesia and Analgesia |