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Occipital NeuralgiaNCT01670825

Pulsed Radiofrequency vs. Steroid Injections for Occipital Neuralgia

A study testing Pulsed radiofrequency, Corticosteroid injection and Local anethestic injection in people with Occipital Neuralgia, run by Johns Hopkins University at 2 sites in United States.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
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Trial summary

The aim of this study is to determine whether pulsed radiofrequency or steroids are better for occipital neuralgia. Seventy-six patients with ON or migraine with tenderness over the occipital nerve who respond to occipital nerve blocks (hereafter included under the broad category "ON") will be randomized in a 1:1… Read more about this study

Who is it for?
Ages 18 to 99 years
Conditions the study is for
Occipital Neuralgia
What is being tested?
Pulsed radiofrequency, Corticosteroid injection and Local anethestic injection
Could I receive a placebo?
No, everyone receives an active treatment
How many people
81 participants
Where
2 sitesUnited States
Study dates
Aug 2012to Feb 2015
Phase
Interventional
Are there results?
Yes, posted in the registrySummary in the doctors' view

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 to 99 years
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Age greater or equal to 18 years
  • Occipital neuralgia diagnosed based on history \& physical exam and diagnostic local anesthetic blocks, or migraine with occipital nerve(s) tenderness that responds to diagnostic blocks.
  • Greater or equal to 50% relief based on diagnostic local anesthetic block of the greater and/ or lesser occipital nerves that lasts for at least 90 minutes with lidocaine or 3 hours with bupivacaine or ropivacaine 20
  • Baseline Numerical Rating Scale average pain score > 4/10
  • Frequency of greater or equal to 4/10 pain for at least 10 days per month

Who cannot join

  • Untreated coagulopathy
  • Automatic implantable cardiac defibrillator or pacemaker that cannot be temporarily disabled for medical reasons
  • Previous pulsed radiofrequency
  • Other sources of headache, such as tension-type headache, cervicogenic headache, migraine headache without occipital neuralgia, and other causes (e.g. tumors, congenital abnormalities etc.). Those that can be confused with ON must be excluded based on history and exam (e.g. cervicogenic headaches), symptoms (tension-type headache), response to blocks (all of the above); and lab work (temporal arteritis, which would be confirmed by biopsy after an elevated erythrocyte sedimentation rate).
  • Serious medical or uncontrolled or severe psychiatric -

Trial locations and contacts

2 sites in 1 country.

United States2 sites
  • Johns Hopkins

    Baltimore, Maryland, 21205

  • Walter Reed National Military Medical Center

    Bethesda, Maryland, 20889

Other trials in United States

About this study

Official title: Randomized, Double-blind, Comparative-effectiveness Study Comparing Corticosteroid Injections to Pulsed Radiofrequency for Occipital Neuralgia

The aim of this study is to determine whether pulsed radiofrequency or steroids are better for occipital neuralgia. Seventy-six patients with ON or migraine with tenderness over the occipital nerve who respond to occipital nerve blocks (hereafter included under the broad category "ON") will be randomized in a 1:1 ratio to receive either corticosteroid and local anesthetic injections (n=38) or local anesthetic and PRF of the occipital nerve(s) (n=38) for occipital neuralgia. Both patients and the treating \& evaluating physicians will be blinded. The first follow-up visit will be at 6 weeks. Patients who obtain significant pain relief will remain in the study. Those patients who fail to obtain any benefit will exit the study and be allowed to crossover to the other treatments or receive alternative care. The second follow-up will be at 3 months and the final follow-up will be at 6-months post-procedure.

Read the detailed description

Up to 76 patients referred to one of the participating pain clinic with occipital neuralgia, or migraines with occipital nerve tenderness (dual diagnoses) will be randomized in a 1:1 ratio by a computer generated randomization table to receive one of two treatments. Treatments will be randomized at each institution. Within each group, those patients with plain occipital neuralgia, and those with occipital neuralgia with migraines, will be sub-randomized in the same 1:1 ratio. Diagnosis of ON will be made by low-volume (< 3 mL bupivacaine per nerve). Our criterion for a positive response will be > 50% pain relief lasting at least 3 hours. Those individuals who have symptoms in the distribution of both the greater and lesser occipital nerves will receive treatment of both nerves. The greater occipital nerve is more frequently affected than the lesser nerve.

Half (n=38) of the patients will be allocated to receive local anesthetic \& corticosteroid injections at each nerve (group I), with an equal number allocated to receive local anesthetic \& PRF at each (group II). In those patients who request sedation, an intravenous will be inserted and light sedation administered with low doses of midazolam and fentanyl, in accordance with our standard clinic practice. Treatment in all patients will be accomplished using 20-gauge radiofrequency needles with 10 mm active tips. Prior to treating, electrical stimulation will be performed to ensure ample proximity to the targeted nerve(s), with our target threshold being concordant stimulation at < 0.3 volts at each site.

Once proper needle position is ensured, those in group I will receive an injection at each nerve containing 30 mg of depomethylprednisolone mixed with 2 mL of a 50:50 mixture of 2% lidocaine and 0.5% bupivacaine (2.75 mL). Anywhere between 1 and 4 nerves can be injected, with 4 nerves being targeted if a patient had bilateral lesser and greater occipital nerve involvement. This will be followed by 3 cycles of sham PRF at 120 s per cycle, with slight (approximately 30o electrode adjustments between cycles. For sham PRF, no electrical field or heat is generated (i.e. the machine is not set to any radiofrequency cycle after stimulation), but the cycle times (120 s per cycle) are adhered to (i.e. we will wait a total of 6", 2" per cycle). Those patients in group II will receive injections at each nerve containing 2.75 mL of a solution with 2 mL of 50:50 2% lidocaine and 0.5% bupivacaine + 0.75 mL saline (2.75 mL), followed by 3 cycles of PRF using the following standard settings: voltage output 40-60 V; 2 Hz frequency; 20 ms pulses in a 1-second cycle, 120 second duration per cycle; impedance range between 150 and 400 Ohms; and 42o C plateau temperature.

No patient will be prescribed additional medications or therapy between their procedure and first follow-up. However, they will be allowed to remain on their current, stable analgesic regimen. Rescue medications will consist of tramadol 50 mg 1 to 2 tablets every 6 hours PRN (up to 8/d) and/or acetaminophen or a non-steroidal anti-inflammatory drug such as ibuprofen, diclofenac or ketorolac on an "as needed" basis.

Follow-ups will be performed by a physician blinded to treatment allocation. A preliminary follow-up will be performed at weeks. The first full follow-up visit will be scheduled 6-weeks from the start of treatment. A positive outcome will be defined as a > 50% decrease in headache coupled with a positive satisfaction rating (> 3 on a 0-5 scale). Subjects who obtain a positive outcome at their initial 6-week follow-up visit will remain in the study and return for their 3-month follow-up visit. Those with a negative outcome will exit the study "per protocol" to receive standard care. Subjects who obtain a positive outcome at 1-month but experience a recurrence before their 3-month follow-up visit will also exit the study per protocol, with their final outcome measures recorded before they receive standard care. Those who obtain a positive outcome at 3-months will remain in the study for their final 6-month follow-up, while those who obtain a negative outcome will exit the study. Unblinding for both patients and the treating physician will be after the patient exits the study or after their final follow-up visit for those with continued benefit.

Being tested
Pulsed radiofrequency, Corticosteroid injection, Local anethestic injection
Keywords
Occipital neuralgia, corticosteroid injection, pulsed radiofrequency

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • Pulsed radiofrequencyProcedure or surgery

    Local anesthetic injection and pulsed radiofrequency treatment x 6 minutes over each affected occipital nerve

  • Corticosteroid injectionDrug

    Corticosteroid and local anesthetic injection plus sham pulsed radiofrequency over each affected occipital nerve

  • Local anethestic injectionDrug

    Also called Local anethestic injection that both arms will receive

Study groups in NCT01670825
Study groupRoleWhat they receive
Pulsed radiofrequency + local anesthetic injectionExperimentalLocal anesthetic injection plus pulsed radiofrequency over each affected occipital nerve
Receives: Procedure: Pulsed radiofrequency; Drug: Local anethestic injection
Corticosteroid injection + sham pulsed radiofrequencyActive comparatorInjection with corticosteroid and local anesthetic over the occipital nerve(s)plus "sham" pulsed radiofrequency
Receives: Drug: Corticosteroid injection; Drug: Local anethestic injection

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Change in Average Occipital Pain 6 Weeks After the Start of Treatment

    The change in the numeric pain scale score from baseline to 6 weeks after treatment. The scale ranges from 0-10. The minimum score is 0 which is defined as no pain and the maximum score is 10, which is defined as the worst pain imaginable. The best possible outcome would be a 0. The worst possible outcome would be a 10.

    Measured: From baseline to 6 weeks after the start of treatment

  2. Change in Worst Occipital Pain 6 Weeks After the Start of Treatment

    The change in the numeric pain scale score from baseline to 6 weeks after treatment. The scale ranges from 0-10. The minimum score is 0 which is defined as no pain and the maximum score is 10, which is defined as the worst pain imaginable. The best possible outcome would be a 0. The worst possible outcome would be a 10.

    Measured: From baseline to 6 weeks after the start of treatment

  3. Change in Average Occipital Pain 6 Months After the Start of Treatment

    The change in the numeric pain scale score from baseline to 6 months after treatment. The scale ranges from 0-10. The minimum score is 0 which is defined as no pain and the maximum score is 10, which is defined as the worst pain imaginable. The best possible outcome would be a 0. The worst possible outcome would be a 10.

    Measured: From baseline to 6 months after the start of treatment

  4. Change in Worst Occipital Pain 6 Months After the Start of Treatment

    This outcome measures the change in the numeric pain scale score from baseline to 6 months after treatment. The scale ranges from 0-10. The minimum score is 0 which is defined as no pain and the maximum score is 10, which is defined as the worst pain imaginable. The best possible outcome would be a 0. The worst possible outcome would be a 10.

    Measured: From baseline to 6 months after the start of treatment

  5. Change in Average Occipital Pain 3 Months After the Start of Treatment

    This outcome measures the change in the numeric pain scale score from baseline to 3 months after treatment. The scale ranges from 0-10. The minimum score is 0 which is defined as no pain and the maximum score is 10, which is defined as the worst pain imaginable. The best possible outcome would be a 0. The worst possible outcome would be a 10.

    Measured: From baseline to 3 months after the start of treatment

  6. Change in Worst Occipital Pain 3 Months After the Start of Treatment

    This outcome measures the change in the numeric pain scale score from baseline to 3 months after treatment. The scale ranges from 0-10. The minimum score is 0 which is defined as no pain and the maximum score is 10, which is defined as the worst pain imaginable. The best possible outcome would be a 0. The worst possible outcome would be a 10.

    Measured: From baseline to 3 months after the start of treatment

  7. Change in Average Occipital Pain 2 Weeks After the Start of Treatment

    This outcome measures the change in the numeric pain scale score from baseline to 2 weeks after treatment. The scale ranges from 0-10. The minimum score is 0 which is defined as no pain and the maximum score is 10, which is defined as the worst pain imaginable. The best possible outcome would be a 0. The worst possible outcome would be a 10.

    Measured: From baseline to 2 weeks after the start of treatment

  8. Change in Worst Occipital Pain 2 Weeks After the Start of Treatment

    This outcome measures the change in the numeric pain scale score from baseline to 2 weeks after treatment. The scale ranges from 0-10. The minimum score is 0 which is defined as no pain and the maximum score is 10, which is defined as the worst pain imaginable. The best possible outcome would be a 0. The worst possible outcome would be a 10.

    Measured: From baseline to 2 weeks after the start of treatment

  9. Change in Overall Average Headache Pain 2 Weeks After the Start of Treatment

    This outcome measures the change in the numeric pain scale score from baseline to 2 weeks after treatment. The scale ranges from 0-10. The minimum score is 0 which is defined as no pain and the maximum score is 10, which is defined as the worst pain imaginable. The best possible outcome would be a 0. The worst possible outcome would be a 10.

    Measured: From baseline to 2 weeks after the start of treatment

  10. Change in Overall Worst Headache Pain 2 Weeks After the Start of Treatment

    This outcome measures the change in the numeric pain scale score from baseline to 2 weeks after treatment. The scale ranges from 0-10. The minimum score is 0 which is defined as no pain and the maximum score is 10, which is defined as the worst pain imaginable. The best possible outcome would be a 0. The worst possible outcome would be a 10.

    Measured: From baseline to 2 weeks after the start of treatment

  11. Change in Overall Average Headache Pain 6 Weeks After the Start of Treatment

    This outcome measures the change in the numeric pain scale score from baseline to 6 weeks after treatment. The scale ranges from 0-10. The minimum score is 0 which is defined as no pain and the maximum score is 10, which is defined as the worst pain imaginable. The best possible outcome would be a 0. The worst possible outcome would be a 10.

    Measured: From baseline to 6 weeks after the start of treatment

  12. Change in Overall Worst Overall Headache Pain 6 Weeks After the Start of Treatment

    This outcome measures the change in the numeric pain scale score from baseline to 6 weeks after treatment. The scale ranges from 0-10. The minimum score is 0 which is defined as no pain and the maximum score is 10, which is defined as the worst pain imaginable. The best possible outcome would be a 0. The worst possible outcome would be a 10.

    Measured: From baseline to 6 weeks after the start of treatment

  13. Change in Overall Average Headache Pain 3 Months After the Start of Treatment

    This outcome measures the change in the numeric pain scale score from baseline to 3 months after treatment. The scale ranges from 0-10. The minimum score is 0 which is defined as no pain and the maximum score is 10, which is defined as the worst pain imaginable. The best possible outcome would be a 0. The worst possible outcome would be a 10.

    Measured: From baseline to 3 months after the start of treatment

  14. Change in Overall Worst Headache Pain 3 Months After the Start of Treatment

    This outcome measures the change in the numeric pain scale score from baseline to 3 months after treatment. The scale ranges from 0-10. The minimum score is 0 which is defined as no pain and the maximum score is 10, which is defined as the worst pain imaginable. The best possible outcome would be a 0. The worst possible outcome would be a 10.

    Measured: From baseline to 3 months after the start of treatment

  15. Change in Overall Average Headache Pain 6 Months After the Start of Treatment

    This outcome measures the change in the numeric pain scale score from baseline to 6 months after treatment. The scale ranges from 0-10. The minimum score is 0 which is defined as no pain and the maximum score is 10, which is defined as the worst pain imaginable. The best possible outcome would be a 0. The worst possible outcome would be a 10.

    Measured: From baseline to 6 months after the start of treatment

  16. Change in Overall Worst Headache Pain 6 Months After the Start of Treatment

    This outcome measures the change in the numeric pain scale score from baseline to 6 months after treatment. The scale ranges from 0-10. The minimum score is 0 which is defined as no pain and the maximum score is 10, which is defined as the worst pain imaginable. The best possible outcome would be a 0. The worst possible outcome would be a 10.

    Measured: From baseline to 6 months after the start of treatment

Secondary outcomes (15)
  1. Change in the Presence of Insomnia 6 Weeks After the Start of Treatment Measured Using the Athens Insomnia Scale.

    This outcome will measure the participant's perceived improvement in sleep using the Athens Insomnia Scale. Scores in this scale can range from 0 to 24. 0 being the best possible outcome and 24 being the worst possible outcome. A score greater than or equal to 6 indicates a presence of insomnia.

    Measured: From baseline to 6 weeks after the start of treatment

  2. Change in the Presence of Insomnia 3 Months After the Start of Treatment Measured Using the Athens Insomnia Scale.

    This outcome will measure the participant's perceived improvement in sleep using the Athens Insomnia Scale. Scores in this scale can range from 0 to 24. 0 being the best possible outcome and 24 being the worst possible outcome. A score greater than or equal to 6 indicates a presence of insomnia.

    Measured: From baseline to 3 months after the start of treatment

  3. Change in the Presence of Insomnia 6 Months After the Start of Treatment Measured Using the Athens Insomnia Scale.

    This outcome will measure the participant's perceived improvement in sleep using the Athens Insomnia Scale. Scores in this scale can range from 0 to 24. 0 being the best possible outcome and 24 being the worst possible outcome. A score greater than or equal to 6 indicates a presence of insomnia.

    Measured: From baseline to 6 months after the start of treatment

  4. Change in the Severity of Depression 6 Weeks After the Start of Treatment Measured Using the Beck's Depression Inventory

    This outcome will measure the change in severity of depression using the Beck's Depression Inventory. Scores in this inventory can range from 0 to 63. 0 being the best possible outcome and 63 being the worst possible outcome. A score between 14 and 19 indicates mild depression and a score greater than or equal 29 indicates severe depression.

    Measured: From baseline to 6 weeks after the start of treatment

  5. Change in the Severity of Depression 3 Months After the Start of Treatment Measured Using the Beck's Depression Inventory

    This outcome will measure the change in severity of depression using the Beck's Depression Inventory. Scores in this inventory can range from 0 to 63. 0 being the best possible outcome and 63 being the worst possible outcome. A score between 14 and 19 indicates mild depression and a score greater than or equal 29 indicates severe depression.

    Measured: From baseline to 3 months after the start of treatment

  6. Change in the Severity of Depression 6 Months After the Start of Treatment Measured Using the Beck's Depression Inventory

    This outcome will measure the change in severity of depression using the Beck's Depression Inventory. Scores in this inventory can range from 0 to 63. 0 being the best possible outcome and 63 being the worst possible outcome. A score between 14 and 19 indicates mild depression and a score greater than or equal 29 indicates severe depression.

    Measured: From baseline to 6 months after the start of treatment

  7. Severe Headache Frequency for Migraine Headaches 6 Weeks After the Start of Treatment Measured Asking the Number of Severe Headaches in the Past Week.

    This outcome will measure the number of days the patient has severe migraine headaches in the week (7 days) prior to the 6 week follow-up visit. A severe headache is defined as a headache with a score greater than or equal to 7 on the numeric pain scale.

    Measured: From baseline to 6 weeks after the start of treatment

  8. Severe Headache Frequency for Occipital Neuralgia Headaches 6 Weeks After the Start of Treatment Measured Asking the Number of Severe Headache Days 1 Week Prior to Study Visit

    This outcome will measure the number of days the patient has severe occipital neuralgia headaches in the week (7 days) prior to the 6 week follow-up visit. A severe headache is defined as a headache with a score greater than or equal to 7 on the numeric pain scale.

    Measured: From baseline to 6 weeks after the start of treatment

  9. Severe Headache Frequency for Migraine Headaches 3 Months After the Start of Treatment Measured Asking the Number of Severe Headache Days 1 Week Prior to Study Visit

    This outcome will measure the number of days the patient has severe migraine headaches in the week (7 days) prior to the 3 month follow-up visit. A severe headache is defined as a headache with a score greater than or equal to 7 on the numeric pain scale.

    Measured: From baseline to 3 months after the start of treatment

  10. Severe Headache Frequency for Occipital Neuralgia Headaches 3 Months After the Start of Treatment Measured Asking the Number of Severe Headache Days 1 Week Prior to Study Visit

    This outcome will measure the number of days the patient has severe occipital neuralgia headaches in the week (7 days) prior to the 6 week follow-up visit. A severe headache is defined as a headache with a score greater than or equal to 7 on the numeric pain scale.

    Measured: 3 months

  11. Severe Headache Frequency for Migraine Headaches 6 Months After the Start of Treatment Measured Asking the Number of Severe Headache Days 1 Week Prior to Study Visit

    This outcome will measure the number of days the patient has severe migraine headaches in the week (7 days) prior to the 6 month follow-up visit. A severe headache is defined as a headache with a score greater than or equal to 7 on the numeric pain scale.

    Measured: From baseline to 6 months after the start of treatment

  12. Severe Headache Frequency for Occipital Neuralgia Headaches 6 Months After the Start of Treatment Measured Asking the Number of Severe Headache Days 1 Week Prior to Study Visit

    This outcome will measure the number of days the patient has severe occipital neuralgia headaches in the week (7 days) prior to the 6 week follow-up visit. A severe headache is defined as a headache with a score greater than or equal to 7 on the numeric pain scale.

    Measured: From baseline to 6 months after the start of treatment

  13. Disability Due to Headaches 6 Weeks After the Start of Treatment Measured Using the Headache Impact Scale

    This outcome measures what the patient feels they cannot do because headaches. This outcome is measured using the Headache Impact Test. Scores in this test range from range from 36 to 78, with higher scores indicating greater negative impact. A score of less than 50 indicates minimal impact, while a score greater than or equal to 60 indicates headaches are severely impacting one's life.

    Measured: From baseline to 6 weeks after the start of treatment

  14. Disability Due to Headaches 3 Months After the Start of Treatment Measured Using the Headache Impact Scale

    This outcome measures what the patient feels they cannot do because headaches. This outcome is measured using the Headache Impact Test. Scores in this test range from range from 36 to 78, with higher scores indicating greater negative impact. A score of less than 50 indicates minimal impact, while a score greater than or equal to 60 indicates headaches are severely impacting one's life.

    Measured: From baseline to 3 months after the start of treatment

  15. Disability Due to Headaches 6 Months After the Start of Treatment Measured Using the Headache Impact Scale

    This outcome measures what the patient feels they cannot do because headaches. This outcome is measured using the Headache Impact Test. Scores in this test range from range from 36 to 78, with higher scores indicating greater negative impact. A score of less than 50 indicates minimal impact, while a score greater than or equal to 60 indicates headaches are severely impacting one's life.

    Measured: From baseline to 6 months after the start of treatment

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted22 Aug 2012 (estimated)
  2. Study startAug 2012
  3. Primary completionFeb 2015
  4. Study completionFeb 2015

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase N/A
Primary purpose
Treatment
Allocation
Randomised
Intervention model
Parallel groups
Masking
Quadruple blind
Who is masked
Participant, Care provider, Investigator, Outcomes assessor
Enrolment
81 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT01670825
Sponsor's protocol ID
373481-3
Status last verified
Jan 2017
First submitted
19 Aug 2012
Last updated
1 Mar 2017
Data monitoring committee
No

Publications

  • Huang JH, Galvagno SM Jr, Hameed M, Wilkinson I, Erdek MA, Patel A, Buckenmaier C 3rd, Rosenberg J, Cohen SP. Occipital nerve pulsed radiofrequency treatment: a multi-center study evaluating predictors of outcome. Pain Med. 2012 Apr;13(4):489-97. doi: 10.1111/j.1526-4637.2012.01348.x. Epub 2012 Mar 5.

    PubMed 22390409
  • Vanelderen P, Rouwette T, De Vooght P, Puylaert M, Heylen R, Vissers K, Van Zundert J. Pulsed radiofrequency for the treatment of occipital neuralgia: a prospective study with 6 months of follow-up. Reg Anesth Pain Med. 2010 Mar-Apr;35(2):148-51. doi: 10.1097/aap.0b013e3181d24713.

    PubMed 20301822
  • Choi HJ, Oh IH, Choi SK, Lim YJ. Clinical outcomes of pulsed radiofrequency neuromodulation for the treatment of occipital neuralgia. J Korean Neurosurg Soc. 2012 May;51(5):281-5. doi: 10.3340/jkns.2012.51.5.281. Epub 2012 May 31.

    PubMed 22792425
  • Cohen SP, Peterlin BL, Fulton L, Neely ET, Kurihara C, Gupta A, Mali J, Fu DC, Jacobs MB, Plunkett AR, Verdun AJ, Stojanovic MP, Hanling S, Constantinescu O, White RL, McLean BC, Pasquina PF, Zhao Z. Randomized, double-blind, comparative-effectiveness study comparing pulsed radiofrequency to steroid injections for occipital neuralgia or migraine with occipital nerve tenderness. Pain. 2015 Dec;156(12):2585-2594. doi: 10.1097/j.pain.0000000000000373.

    PubMed 26447705

Questions about this trial

What is this clinical trial studying?

A study testing Pulsed radiofrequency, Corticosteroid injection and Local anethestic injection in people with Occipital Neuralgia, run by Johns Hopkins University at 2 sites in United States.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 5 inclusion and 5 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: finished, as of the sponsor's last update on 1 Mar 2017. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 2 sites in United States. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

Are results available for this study?

Yes. Results are posted in the registry (first posted 1 Mar 2017). A summary is in the For doctors view, and the full results are on ClinicalTrials.gov.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Change in Average Occipital Pain 6 Weeks After the Start of Treatment (time frame: From baseline to 6 weeks after the start of treatment). The study lists 16 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT01670825, which also lists 4 linked publications.

Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 1 Mar 2017.

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