Dominic Stone
The sternocleidomastoid SCM muscle is a powerful neck muscle that allows you to bend your neck and turn or tilt your head. Vagal nerve stimulation (VNS) is a treatment option for selected clinical conditions such as epilepsy, depression, tremor, and pain conditions that are unresponsive to standard pharmacologic interventions. Recent studies have shown that vagal nerve stimulation can induce spasms of the sternocleidomastoid muscle. This paragraph aims to explore the relationship between vagal nerve stimulation and spasms of the sternocleidomastoid muscle.
| Characteristics | Values |
|---|---|
| Sternocleidomastoid Muscle | Largest muscle in the front of the neck |
| Vagal Nerve Stimulation | Treatment for drug-resistant epilepsies |
| Vagal Nerve Stimulation Side Effects | Spasms of the head and neck muscles, increased heartburn, discomfort, increased saliva production |
| Sternocleidomastoid Syndrome | Neck stiffness, pain, trigger points, headaches, sinusitis, sore throat |
| Sternocleidomastoid Muscle Treatment | Stretching, physical therapy, osteopathic manipulation, self-massage, yoga, meditation, breathing techniques |
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What You'll Learn
- Vagal nerve stimulation (VNS) is a treatment for drug-resistant epilepsies
- Intraoperative stimulation of vagal nerves induces vocal cord responses
- The nerves innervating the sternohyoid and sternocleidomastoid muscles may be exposed during the procedure
- VNS surgeries are costly and carry surgical and device-related risks
- Sternocleidomastoid syndrome can cause neck stiffness, pain and other symptoms
Vagal nerve stimulation (VNS) is a treatment for drug-resistant epilepsies
Vagal nerve stimulation (VNS) is a treatment for drug-resistant epilepsy. It involves a small device implanted under the skin in the chest, connected to the left vagus nerve in the neck. The device delivers mild electrical pulses to the brain through the vagus nerve, helping to prevent seizures and stop them if they occur. It is an add-on treatment, used in conjunction with seizure medications.
VNS therapy is approved by the U.S. Food and Drug Administration (FDA) for adults and children aged four and older. It is primarily indicated for focal seizures but has also been effective in some types of generalised seizures. The therapy consists of a generator device, with an electrode or wire attached and placed under the skin, which is then wound around the vagus nerve. The device is programmed to deliver pulses at regular intervals, and a person does not need to do anything for it to work.
VNS therapy is a minimally invasive procedure, but it is costly and carries surgical and device-related risks. It is not suitable for everyone, and people with significant asthma or other breathing problems, sleep apnea, or certain heart problems may be advised against it. It is important for anyone considering VNS therapy to consult their doctor to ensure it is right for them.
While VNS therapy has been shown to be effective in reducing the frequency, severity, and recovery times of seizures, it is not a cure for epilepsy. It may take up to a year for the treatment to have an effect, and for some people, it may have no impact on their seizures. However, if VNS therapy works, it may be possible to reduce the dosage of seizure medications over time.
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Intraoperative stimulation of vagal nerves induces vocal cord responses
Vagal nerve stimulation (VNS) is a relatively new treatment for drug-resistant epilepsies and other conditions such as depression, tremor, and pain. It involves the surgical implantation of electronic devices to stimulate the vagus nerve electrically. While VNS surgeries are considered minimally invasive, they are costly and carry surgical and device-related risks.
Intraoperative nerve stimulation during VNS placement has been studied to prevent electrode misplacement and establish intraoperative monitoring procedures. In one study, 46 patients underwent intraoperative nerve stimulation during VNS placement. The vagal nerve and other exposed nerves were electrically stimulated during surgery, and muscle contraction was confirmed by electromyography of the vocal cords and visual recognition of cervical muscle contraction.
The stimulation of vagal nerves induced vocal cord responses in all 46 patients, with a median threshold of 0.2 mA (range: 0.05–0.75 mA). The medial middle region was identified as the most sensitive part of the vagal nerve in most patients (82.5%). In a few patients, other cervical nerves were stimulated, inducing sternohyoid and sternocleidomastoid muscle contraction.
The study concluded that intraoperative stimulation of vagal nerves induces vocal cord responses with locational variations, and stimulating the middle part could minimize stimulus intensities. Understanding the nerves innervating the sternohyoid and sternocleidomastoid muscles is essential for enhancing the effectiveness of this technique in future applications.
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The nerves innervating the sternohyoid and sternocleidomastoid muscles may be exposed during the procedure
Vagal nerve stimulation (VNS) is a treatment option for selected clinical conditions, such as epilepsy, depression, tremor, and pain conditions, that are unresponsive to standard pharmacologic interventions. Although VNS device surgeries are considered minimally invasive, they are costly and carry surgical and device-related risks. They can also cause serious adverse effects from excessive vagus nerve stimulation.
During intraoperative nerve stimulation for vagal nerve stimulator placement, other nerves surrounding the vagal nerve may be exposed and stimulated. The nerves innervating the sternohyoid and sternocleidomastoid muscles may be exposed during the procedure. In a study, sternohyoid muscle contraction was induced in eight patients, and sternocleidomastoid muscle contraction was induced in the remaining three patients. The sternohyoid muscle is innervated by the ansa cervicalis, and the nerve is activated at a stimulus intensity of 0.1–0.7 mA. The sternocleidomastoid muscle is typically innervated by the spinal root or part of the accessory nerve (cranial nerve XI), although it may also receive innervation from the cervical plexus (C2-C4), a branch originating from the ansa cervicalis and hypoglossal nerve.
The stimulation of these nerves during the procedure can induce vocal cord responses with locational variations, and middle part stimulation could minimize the stimulus intensities. Knowledge of these nerve characteristics will enhance the effectiveness of this technique in future applications. However, the course of these nerves varies widely, and precise anatomical identification can be difficult. The vagal nerve might also be rotated during dissection, shifting the VNS points from their original anatomical position.
In summary, the nerves innervating the sternohyoid and sternocleidomastoid muscles may be exposed during VNS procedures, leading to potential stimulation and associated vocal cord responses. Understanding these nerve exposures and their effects will be crucial for optimizing future VNS applications and minimizing adverse effects.
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VNS surgeries are costly and carry surgical and device-related risks
Vagus nerve stimulation (VNS) is a type of neuromodulation that uses an implanted device to deliver regular electrical impulses to the brain through the vagus nerve. The vagus nerve is the tenth cranial nerve and the longest nerve in the body. It is nicknamed the "wandering nerve" because it travels from the brain down to the intestines. VNS is approved to treat conditions including epilepsy, depression, tremor, and pain conditions that are unresponsive to standard pharmacologic interventions.
While VNS device surgeries are considered minimally invasive, they are costly and carry surgical and device-related risks. The surgeries typically last between 45 and 90 minutes, during which the patient is put under general anesthesia. The surgeon makes two small incisions—one underneath the collarbone on the left side of the chest for the stimulator device and one on the left side of the lower neck. A small pocket of space is created underneath the skin below the incision in the chest for the stimulator device. A thin, flexible wire is then threaded through the neck to the vagus nerve and connected to the stimulator device.
VNS surgeries carry some risks, although complications during surgery are rare. Surgical complications may include postoperative hematoma, infection, unilateral vocal cord palsy, lower facial weakness, pain, sensory-related issues, aseptic reaction, cable discomfort, surgical cable break, oversized stimulator pocket, and battery displacement. Longer surgery duration is a possible risk factor for surgical complications after VNS lead revision surgery. Lead removal or replacement surgeries are associated with a higher surgical complication rate than other VNS surgeries.
In addition to surgical risks, VNS device implantation also carries device-related risks. Hardware-related complications may include lead fracture or malfunction, spontaneous VNS turn-on, and lead disconnection. VNS therapy may also cause some temporary side effects, such as muscle twitching or involuntary movements, pain at the incision site, and problems with sensation, including decreased sense of touch, prickling, or tingling. These side effects typically occur as the body adjusts to the device.
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Sternocleidomastoid syndrome can cause neck stiffness, pain and other symptoms
Sternocleidomastoid syndrome, also known as SCM syndrome, is a condition that arises when the SCM muscle becomes tight, strained, or injured. SCM syndrome can cause neck stiffness, pain, and a variety of other symptoms. SCM syndrome can be caused by muscle strain or overuse, leading to micro-tears and inflammation. It can also be caused by trauma, such as whiplash, which can directly injure the SCM muscle.
The SCM muscle, or sternocleidomastoid muscle, is a neck muscle that plays a crucial role in neck movement and posture. It runs along each side of the neck and helps with nodding and rotating the head. When the SCM muscle becomes dysfunctional, it can result in a unique set of symptoms, including neck pain and stiffness. Other symptoms of SCM syndrome can include:
- Headaches
- Dizziness
- Arm tingling
- Referred pain or numbness in the shoulder, hand, or fingers
- Visual disturbances or heightened sensitivity to light
- Facial pain
- Nausea
- Blurred vision
- Eyelid jerking
SCM syndrome can be effectively managed through a combination of treatments, including chiropractic care, physical therapy, posture correction, and stress management techniques. Early diagnosis and management by a healthcare provider are important for prompt symptom relief. Conservative interventions such as rest, heat or ice application, massage, and exercise can often be successful in treating SCM syndrome. In some cases, prescription muscle relaxants may be recommended to provide pain relief.
In rare cases, SCM syndrome may be induced by vagal nerve stimulation (VNS), a treatment for drug-resistant epilepsies. VNS can inadvertently stimulate the nerves innervating the SCM muscle, leading to spasms. However, this is not a common occurrence, and VNS is generally considered a safe and effective treatment option for certain clinical conditions.
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Frequently asked questions
Yes, intraoperative stimulation of vagal nerves induces vocal cord responses with locational variations, and stimulation of the middle part could minimize the stimulus intensities.
Your sternocleidomastoid (SCM) muscle is a powerful neck muscle that allows you to bend your neck and turn or tilt your head. It is the largest muscle in the front of your neck.
SCM syndrome can be caused by stress and anxiety, ageing, poor posture, neck trauma, and certain occupations, among other factors.
Symptoms include frequent headaches, ptosis, blurred vision, sinus headaches, eye reddening, sinusitis, sore throat, dizziness, nausea, and vertigo.
Treatment options include stress-relieving techniques such as meditation, relaxation, yoga, light bodyweight exercises, and breathing techniques. Other treatments include stretching, physical therapy, osteopathic manipulation, and in some cases, surgery.
