Effects of tDCS on Heart Rate Variability in Chronic Low Back Pain

Study Overview
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Brief Summary
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Chronic low back (CLBP) pain is an important public health and socioeconomic problem worldwide and, despite the volume of research in the area, it remains a difficult condition to treat. There are some evidences that altered heart rate variability (HRV) parameters are associated with different clinical disorders, such as chronic low back pain. For instances, diminished parasympathetic activity has been explored as a potential therapeutic target. Considering the dynamic interaction between brain and heart, neuromodulatory strategies targeting this relationship could exert a positive influence on cardiac autonomic system and pain modulation systems. Transcranial direct current (tDCS) stimulation is a noninvasive neuromodulation technique that has been presenting recent advances in the treatment of chronic pain. However, tDCS application focusing on brain-heart interaction has not been extensively explored, especially on chronic pain conditions. This study aims to investigate the effects of tDCS on HRV in chronic low back pain patients. Sixty patients will be randomized into two distinct groups to receive either tDCS (anodal) or tDCS (sham) in a single session protocol. The primary clinical outcome (HRV parameter) will be collected before, during and post-tDCS. The data will be collected by a blind examiner to the treatment allocation.

Official Title
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Effects of Transcranial Direct Current Stimulation on Heart Rate Variability in Chronic Low Back Pain Patients: a Randomized Controlled Trial

Conditions
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Chronic Low-back Pain

Intervention / Treatment
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* Device: Transcranial direct current stimulation


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Complaining of back pain for more than three months. Presence of a chronic pain measurable with the number rating scale (NRS 0-10) not less than 4 during a 1 week daily NRS monitoring. Seeking care for low back pain. Exclusion Criteria: Previous surgery on the spine Spondylolisthesis Previous treatment with tDCS Disc herniation with nerve compression Neurological Psychiatric Rheumatologic diseases Impaired sensibility Use of pacemakers or other implanted devices Pregnancy Cardiovascular diseases

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 65 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
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: tDCS (anodal)<br>Real transcranial direct current stimulation tDCS: 20 minutes, 2mA, primary motor cortex anode (contralateral to the lesion) and supraorbital cathode (ipsilateral to the lesion). | Device: Transcranial direct current stimulation<br>* tDCS: 20 minutes, 2mA, primary motor cortex anode (contralateral to the lesion) and supraorbital cathode (ipsilateral to the lesion).Technique based on the application of weak, direct electrical current to the brain through relatively large electrodes that are placed over the scalp, in which anodal and cathodal stimulation increases and decreases cortical excitability, respectively.<br>|
| Sham Comparator: tDCS (sham)<br>Sham transcranial direct current stimulation tDCS: 20 minutes (30 seconds ON), 2mA, primary motor cortex anode (contralateral to the lesion) and supraorbital cathode (ipsilateral to the lesion). | Device: Transcranial direct current stimulation<br>* tDCS: 20 minutes, 2mA, primary motor cortex anode (contralateral to the lesion) and supraorbital cathode (ipsilateral to the lesion).Technique based on the application of weak, direct electrical current to the brain through relatively large electrodes that are placed over the scalp, in which anodal and cathodal stimulation increases and decreases cortical excitability, respectively.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| HRV frequency-domain measures | Frequency domain analysis is conducted to evaluate two components: high frequency (HF) (0.14 and 0.40 Hz), related to the parasympathetic nervous system, and low frequency (LF) (0.004 and 0.15 Hz), related to the sympathetic and parasympathetic nervous system, with predominance of the sympathetic component | After 13 minutes of tDCS | 
| HRV time-domain measures | Time domain analysis is related to global autonomic modulation and is conducted to evaluate differences between RR normal intervals (NN), defined as the temporal distance between consecutive normal beats (sinoatrial depolarizations) between the R peaks of the QRS complex, and their measurements including standard deviation of NN intervals (SDNN), standard deviation of mean RR intervals (SDANN), root mean square differences of successive RR intervals (RMSSD), and the percentage of normal RR intervals that differ by 50 ms (pNN50). | After 13 minutes of tDCS | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| HRV frequency-domain measures | Frequency domain analysis is conducted to evaluate two components: high frequency (HF) (0.14 and 0.40 Hz), related to the parasympathetic nervous system, and low frequency (LF) (0.004 and 0.15 Hz), related to the sympathetic and parasympathetic nervous system, with predominance of the sympathetic component | After 20 minutes of tDCS | 
| HRV time-domain measures | Time domain analysis is related to global autonomic modulation and is conducted to evaluate differences between RR normal intervals (NN), defined as the temporal distance between consecutive normal beats (sinoatrial depolarizations) between the R peaks of the QRS complex, and their measurements including standard deviation of NN intervals (SDNN), standard deviation of mean RR intervals (SDANN), root mean square differences of successive RR intervals (RMSSD), and the percentage of normal RR intervals that differ by 50 ms (pNN50). | After 20 minutes of tDCS |