Summary
Interventional treatment can be understood as surgery that does not require an incision. There are several interventional treatments for postherpetic neuralgia, including epidural steroid injection, peripheral nerve block, Botox injection, pulsed radiofrequency therapy, sympathetic nerve block, neuromodulation, chemical neurolysis, and intrathecal steroid injection. Postherpetic neuralgia is a chronic neuropathic pain condition caused by herpes zoster (shingles), in which patients experience persistent pain and hypersensitivity to touch, affecting their quality of life. Medication is the first-choice treatment, but some patients cannot tolerate its side effects or do not respond to it. In such cases, various interventional methods can serve as effective alternative treatments. However, the choice of each method should be based on the patient’s specific condition and tolerance for risk. To achieve the best treatment outcome, a personalized treatment plan should be developed according to the patient’s needs.
Introduction
Postherpetic neuralgia is a chronic neuropathic pain condition caused by herpes zoster. It is characterized by persistent pain, skin tenderness, or hypersensitivity to pain, all of which can severely affect patients’ quality of life, sleep, and daily activities. This article aims to provide an overview of interventional treatment methods for postherpetic neuralgia.
Epidural Steroid Injection
Epidural steroid injection involves injecting steroids into the epidural space surrounding the nerve roots and spinal cord to reduce inflammation and relieve pain. This treatment can be used for various neuropathic or painful conditions, including postherpetic neuralgia. Some patients report that this treatment relieves pain, and some studies report that it can reduce pain intensity and improve quality of life.
Peripheral Nerve Block
Peripheral nerve block involves injecting local anesthetics near the affected nerve to block pain signals. It can provide temporary pain relief, and when used during the acute phase of herpes zoster, it may help prevent the development of postherpetic neuralgia. This technique can be combined with other treatments, such as pulsed radiofrequency, to enhance its effectiveness.
Botox (Botulinum Toxin A) Injection
Botox injection involves injecting botulinum toxin A subcutaneously or intradermally to reduce pain. Botox injection can provide pain relief. The effect can last three to six months and may improve patients’ quality of life.
Pulsed Radiofrequency Therapy on the Dorsal Root Ganglion or Intercostal Nerves
Pulsed radiofrequency therapy involves applying brief pulses of radiofrequency energy to the affected nerve or dorsal root ganglion to modulate pain signals. Pulsed radiofrequency therapy can provide significant pain relief and improve patients’ quality of life. Multiple studies report that pulsed radiofrequency therapy is safe and effective for patients with postherpetic neuralgia, particularly elderly patients.
Sympathetic Nerve Block
Sympathetic nerve block can be used for patients with herpes zoster and postherpetic neuralgia. It is believed to prevent acute shingles pain from becoming postherpetic neuralgia. Examples of sympathetic nerve block include lumbar sympathetic block for postherpetic neuralgia of the lower limbs, and stellate ganglion block for pain of the upper limbs or face. According to the Oxford Centre for Evidence-Based Medicine Level 2, the evidence for stellate ganglion block is Level 2 evidence.
Neuromodulation
Spinal cord stimulation (SCS) and peripheral nerve stimulation (PNS) are commonly used neuromodulation techniques. Spinal cord stimulation involves using electrical signals to modulate pain signals in the spinal cord. Peripheral nerve stimulation involves using electrical signals to modulate pain signals in peripheral nerves. They are considered a last resort for patients with postherpetic neuralgia who do not respond to medication or cannot tolerate its side effects. They may be especially useful for elderly patients whose medication options are limited because they have multiple different medical conditions.
Intercostal Nerve Chemical Neurolysis or Lumbar Paravertebral Neurolysis
Intercostal nerve chemical neurolysis or lumbar paravertebral neurolysis involves injecting chemical substances such as alcohol to disable the affected intercostal or lumbar paravertebral nerves and relieve pain in patients with postherpetic neuralgia. This treatment can provide long-term pain relief.
Intrathecal Steroid Injection
Some doctors recommend injecting steroids into the cerebrospinal fluid surrounding the spinal cord to reduce inflammation and relieve pain. However, because of its possible complications, this treatment is rarely used.
Conclusion
Postherpetic neuralgia is a common yet challenging pain condition, especially for elderly patients. Although medication is the first choice for initial treatment, many patients may not achieve sufficient pain relief or cannot tolerate the side effects of the drugs. In such cases, interventional treatment may offer another effective strategy. However, the choice of various interventional treatments should be based on the patient’s specific condition, level of pain, physical status, and the level of risk they can accept. To achieve the best treatment outcome, doctors should develop a personalized treatment plan according to their needs and expectations.
References (medical literature):
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Dr. Lee Yuk-ming
Specialist in Pain Medicine
