Great Occipital Nerve Block Using Different Approach

Status Recruiting

Clinical Trial Summary

Great occipital nerve (GON) block is commonly applied for the pain management of occipital neuralgia, migraine, and cervicogenic headache. The GON orginates from the medial branch of the dorsal ramus of the C2 spinal nerve with variable contribution from the C3 dorsal ramus. After emerging from the suboccipital triangle, the nerve courses cephalad in an oblique trajectory between the semispinalis capitis (SC) and obliqus capitis inferior (OCI) muscles. This area was recognized as a potential location for GON injury. The nerve then passes through the trapezius muscle and courses medial to the occipital artery as it ascends to innervate the posterior scalp. Many practitioners perform GON injections using a conventional approach, relying solely on superficial bone-based anatomic landmarks to infiltrate local anesthetic and corticosteroid around the nerve at the level of the superior nuchal line. Some clinicians also use fluoroscopy to confirm the location of bony landmarks. The ambiguity of these injections poses a risk of anesthetizing adjacent structures or injecting into vessels, such as the occipital artery. Very limited research has been done to quantify the risk of these injections, but a complication rate of 5% to 10% has been reported, including headache, dizziness, blurred vision, and syncope. Ultrasound guidance is increasingly used to mitigate these risks and improve the efficacy of GON injections. Multiple studies have demonstrated successful ultrasound-guided GON blockade at the superior nuchal line and improvement in pain scores compared with nonguided injections. C2 level GON block using ultrasound targets interfascial plane between OCI and SC muscles. However, a pain physician who begins ultrasound guided injections migth feel very difficult targeting interfascial plane exactly. Since GON orginiates from deep space of suboccipital triangle, it is expected that injection within OCI muscle might have similar effect with the effect of injection into interfascial plane. We assume that if the local anesthetics is injected within OCI muscle, the effect of GON block will be generated by the diffusion of injected local anesthetics.

Clinical Trial Description

n/a

Study Design

Related Conditions & MeSH terms

Clinical Trial Details

NCT number	NCT06149299
Study type	Interventional
Source	Keimyung University Dongsan Medical Center
Contact	Ji H Hong
Phone	+821046794343
Email	swon13@daum.net
Status	Recruiting
Phase	N/A
Start date	November 13, 2023
Completion date	June 30, 2024

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Clinical trials are conducted in a series of steps, called phases - each phase is designed to answer a separate research question.

Phase 1: Researchers test a new drug or treatment in a small group of people for the first time to evaluate its safety, determine a safe dosage range, and identify side effects.
Phase 2: The drug or treatment is given to a larger group of people to see if it is effective and to further evaluate its safety.
Phase 3: The drug or treatment is given to large groups of people to confirm its effectiveness, monitor side effects, compare it to commonly used treatments, and collect information that will allow the drug or treatment to be used safely.
Phase 4: Studies are done after the drug or treatment has been marketed to gather information on the drug's effect in various populations and any side effects associated with long-term use.