Ultrasound-guided pudendal nerve pulsed radiofrequency in patients with refractory pudendal neuralgia: Three cases report

Pudendal neuralgia is characterized by severe sharp pain along the innervation area of pudendal nerve, which may be worsened when sitting position. Successful pudendal nerve block is crucial to the diagnosis of pudendal neuralgia. Although fluoroscopy-guided pudendal nerve blocks have traditionally been performed, recently ultrasound-guided pudendal nerve blocks were reported. For the long term effect of nerve block, pulsed radiofrequency was performed under fluoroscopic guidance in some reports. We report our successful experiences of three cases using ultrasound-guided pulsed radiofrequency.

Stevens-Johnson Syndrome Induced by Carbamazepine Treatment in a Patient Who Previously Had Carbamazepine Induced Pruritus: A Case Report

Stevens-Johnson syndrome (SJS) is a rare but life-threatening skin reaction disease and carbamazepine is one of its most common causes. We report a case of SJS secondary to carbamazepine in a patient with previous pruritus due to carbamazepine which was given for treatment of trigeminal neuralgia. We would like to caution all providers that carbamazepine readministration should be avoided in the patient with a previous history of SJS or adverse skin reaction. In addition, we strongly recommend gradual titration when initiating treatment with carbamazepine.

Anti-Allodynic Effects of Levodopa in Neuropathic Rats

PURPOSE: Levodopa is the most effective anti-Parkinsonian agent. It has also been known to exhibit analgesic properties in laboratory and clinical settings. However, studies evaluating its effects on neuropathic pain are limited. The aim of the present study was to examine the anti-allodynic effects of levodopa in neuropathic rats. MATERIALS AND METHODS: Sprague-Dawley male rats underwent the surgical procedure for L5 and L6 spinal nerves ligation. Sixty neuropathic rats were randomly divided into 6 groups for the oral administration of distilled water and levodopa at 10, 30, 50, 70, and 100 mg/kg, respectively. We co-administered carbidopa with levodopa to prevent peripheral synthesis of dopamine from levodopa, and observed tactile, cold, and heat allodynia pre-administration, and at 15, 30, 60, 90, 120, 150, 180, and 240 min after drug administration. We also measured locomotor function of neuropathic rats using rotarod test to examine whether levodopa caused side effects or not. RESULTS: Distilled water group didn't show any difference in all allodynia. For the levodopa groups (10-100 mg/kg), tactile and heat withdrawal thresholds were increased, and cold withdrawal frequency was decreased dose-dependently (p0.05). CONCLUSION: Levodopa reversed tactile, cold and heat allodynia in neuropathic rat without any side effects.

Ultrasound-guided Pulsed Radiofrequency of the Third Occipital Nerve

A C2-3 zygapophygeal joint is a major source of cervicogenic headache. Radiofrequency (RF) neurotomy is preformed widely for zygapophygeal joint pain. Conventional RF denervation technique is generally performed under fluoroscopic control. Recently, ultrasound-guided radiofrequency on zygapophygeal joint has emerged as an alternative method. We report our experiences of two successful ultrasound-guided pulsed radiofrequencies on 39-year-old and 42-year-old males, who complained occipital headache and posterior neck pain.

Occurrence of a spinal intradural arachnoid cyst after epiduroscopic neural decompression / 대한마취과학회지

No abstract available.

Analgesic Effects of Dexmedetomidine in Vincristine-Evoked Painful Neuropathic Rats

Dexmedetomidine, which is a selective alpha2-adrenoceptor agonist, was recently introduced into clinical practice for its analgesic properties. The purpose of this study was to evaluate the effects of dexmedetomidine in a vincristine-evoked neuropathic rat models. Sprague-Dawley rats were injected intraperitoneally with vincristine or saline (0.1 mg/kg/day) using a 5-day-on, 2-day-off schedule for 2 weeks. Saline and dexmedetomidine (12.5, 25, 50, and 100 microg/kg) were injected to rats developed allodynia 14 days after vincristine injection, respectively. We evaluated allodynia at before, 15, 30, 60, 90, 120, 180, and 240 min, and 24 hr after intraperitoneal drug (normal saline or dexmedetomidine) injection. Saline treatment did not show any differences for all the allodynia. Maximal paw withdrawal thresholds to mechanical stimuli were 3.0 +/- 0.4, 9.1 +/- 1.9, 13.0 +/- 3.6, 16.6 +/- 2.4, and 24.4 +/- 1.6 g at saline, 12.5, 25, 50, and 100 microg/kg dexmedetomidine injection, respectively. Minimal withdrawal frequency to cold stimuli were 73.3 +/- 4.2, 57.1 +/- 6.8, 34.3 +/- 5.7, 20.0 +/- 6.2, and 14.3 +/- 9.5 g at saline, 12.5, 25, 50, and 100 microg/kg dexmedetomidine injection, respectively. Dexmedetomidine shows a dose-dependent antiallodynic effect on mechanical and cold stimuli in vincristine-evoked neuropathic rat models (P < 0.05).

Analgesic Effects of Dexmedetomidine in Vincristine-Evoked Painful Neuropathic Rats

Dexmedetomidine, which is a selective alpha2-adrenoceptor agonist, was recently introduced into clinical practice for its analgesic properties. The purpose of this study was to evaluate the effects of dexmedetomidine in a vincristine-evoked neuropathic rat models. Sprague-Dawley rats were injected intraperitoneally with vincristine or saline (0.1 mg/kg/day) using a 5-day-on, 2-day-off schedule for 2 weeks. Saline and dexmedetomidine (12.5, 25, 50, and 100 microg/kg) were injected to rats developed allodynia 14 days after vincristine injection, respectively. We evaluated allodynia at before, 15, 30, 60, 90, 120, 180, and 240 min, and 24 hr after intraperitoneal drug (normal saline or dexmedetomidine) injection. Saline treatment did not show any differences for all the allodynia. Maximal paw withdrawal thresholds to mechanical stimuli were 3.0 +/- 0.4, 9.1 +/- 1.9, 13.0 +/- 3.6, 16.6 +/- 2.4, and 24.4 +/- 1.6 g at saline, 12.5, 25, 50, and 100 microg/kg dexmedetomidine injection, respectively. Minimal withdrawal frequency to cold stimuli were 73.3 +/- 4.2, 57.1 +/- 6.8, 34.3 +/- 5.7, 20.0 +/- 6.2, and 14.3 +/- 9.5 g at saline, 12.5, 25, 50, and 100 microg/kg dexmedetomidine injection, respectively. Dexmedetomidine shows a dose-dependent antiallodynic effect on mechanical and cold stimuli in vincristine-evoked neuropathic rat models (P < 0.05).

Ultrasound-guided Aspiration of the Iatrogenic Pneumothorax Caused by Paravertebral Block: A Case Report

Thoracic paravertebral block is performed for the treatment of patients with chronic pain, such as complex regional pain syndrome (CRPS) and post-herpetic neuralgia. Thoracic paravertebral block can result in iatrogenic pneumothorax. Because pneumothorax can develop into medical emergencies and needle aspiration or chest tube placement may be needed, early diagnosis is very important. Recently, thoracic ultrasonography has begun to be used to diagnose pneumothorax. In addition, ultrasound-guided aspiration can be an accurate and safe technique for treatment of pneumothorax, as the needle position can be followed in real time. We report a case of iatrogenic pneumothorax following thoracic paravertebral block for the treatment of chronic pain due to CRPS, treated successfully by ultrasound-guided aspiration.

A New Technique for Inferior Hypogastric Plexus Block: A Coccygeal Transverse Approach: A Case Report

Chronic pelvic pain is a common problem with variable etiology. The sympathetic nervous system plays an important role in the transmission of visceral pain regardless of its etiology. Sympathetic nerve block is effective and safe for treatment of pelvic visceral pain. One of them, the inferior hypogastric plexus, is not easily assessable to blockade by local anesthetics and neurolytic agents. Inferior hypogastric plexus block is not commonly used in chronic pelvic pain patients due to pre-sacral location. Therefore, inferior hypogastric plexus is not readily blocked using paravertebral or transdiscal approaches. There is only one report of inferior hypogastric plexus block via transsacral approach. This approach has several disadvantages. In this case a favorable outcome was obtained by using coccygeal transverse approach of inferior hypogastric plexus. Thus, we report a patient who was successfully given inferior hypogastric plexus block via coccygeal transverse approach to treat chronic pelvic pain conditions involving the lower pelvic viscera.

Pain managements in pancreatic cancer patient with opioid-induced hyperalgesia: A case report

Opioids are generally used to treat severe cancer pain. Usually, it is common to increase the dose of opioids to maintain analgesia. Opioid-induced hyperalgesia (OIH) is a paradoxical response to opioid resulting in increased perception of pain rather than antinociceptive effect. A 64-year-old female with pancreatic cancer was suffering from whole abdominal pain. She took massive opioid therapy, however, her pain had been worse and widen in the 3 months. Radiologic imaging was performed to exclude metastatic cancer. The result was negative. We suspected OIH, and reduced the amount of opioids, then, added to adjuvant analgesics. And also we performed celiac plexus neurolysis with the use of alcohol and continuous epidural catheter insertion. Her numeric rating pain scale (NRS) decreased from 9/10 to 3/10. This case suggests that adjuvant analgesics and interventional treatments can resolve a OIH patient with intractable cancer pain.

The effect of pulsed radiofrequency (PRF) for the treatment of supraorbital neuropathic pain: A report of three cases

Historically, peripheral neuropathic pain has occasionally been difficult to treat. Both a systematic review of the evidence as well as clinical experience have demonstrated that treatment options including polypharmacy provide effective pain relief in only half of the patients with neuropathic pain. After peripheral nerve injury, the incidence of degenerative alterations in the spinal cord and central pathologic sensitization are possible. Due to this observation, It may be difficult to treat this group of patients with peripheral neuropathic pain by therapeutic intervention of the peripheral nerve. Pulsed radiofrequency (PRF) has several benefits for treatment of this condition including, accuracy and safety, and the elimination of thermal lesions due to the reduction in the target tissue temperature (below 42 degrees). We treated three cases of supraorbital neuropathic pain using PRF, and discovered that two of the patients had significant pain relief at the six month time point.

Botulinum toxin type A therapy in cluster headache: A case report

Cluster headache is a severe pain syndrome with a piercing, tearing sensation, nicknamed the suicide headache. It is associated with an autonomic symptom. No effective therapy is available in approximately 4-15% of patients with cluster headache. One of the treatment methods is occipital nerve block. It is conventionally performed with local anaesthetics, and in this case we used the botulinum toxin type A. Botulinum toxin is an effective therapeutic agent for various disorders, and has recently been discovered to be an effective treatment for chronic migraine. The efficacy of Botulinum toxin in headache invokes possible neurogenic effects that may reduce or even prevent sensitization of both the peripheral and central nervous system. Therefore, we describe a case of a 45-year-old male with a cluster headache that could not be controlled with conventional therapy. We performed botulium toxin type A therapy. Cluster headache VAS showed improvement after occipital nerve block using the botulinum toxin A.

Daily Functioning in Chronic Pain: Study of Structural Relations with Posttraumatic Stress Disorder Symptoms, Pain Intensity, and Pain Avoidance

BACKGROUND: This study aimed to evaluate processes from the mutual maintenance model in relation to daily functioning in patients with both chronic pain and a history of a traumatic experience. The mechanism illustrated the structural relations for daily functioning among pain intensity, hyperarousal, re-experiencing, trauma avoidance, and pain avoidance. METHODS: Archival data (N = 214) was used for this study and data were analyzed for 142 chronic pain patients reporting a traumatic experience and seeking treatment at a tertiary pain clinic in Korea. RESULTS: The results indicated that pain intensity, hyperarousal, and pain avoidance had significant direct effects on daily functioning. Also, pain intensity showed significant indirect effects on daily functioning through hyperarousal and pain avoidance; and hyperarousal through pain avoidance. CONCLUSIONS: Results suggest a direct contribution of high levels of pain, hyperarousal symptoms of PTSD, and pain avoidance behaviors to reduced daily functioning. Also, elevated pain as reminders of the trauma may trigger high levels of hyperarousal symptoms of PTSD. Subsequently, avoidant coping strategies may be used to minimize pain so that the trauma would not be re-experienced, thus inhibiting the activation of hyperarousal symptoms of PTSD. However, prolonged use of such strategies may contribute to decline in daily functioning.

Daily Functioning in Chronic Pain: Study of Structural Relations with Posttraumatic Stress Disorder Symptoms, Pain Intensity, and Pain Avoidance

BACKGROUND: This study aimed to evaluate processes from the mutual maintenance model in relation to daily functioning in patients with both chronic pain and a history of a traumatic experience. The mechanism illustrated the structural relations for daily functioning among pain intensity, hyperarousal, re-experiencing, trauma avoidance, and pain avoidance. METHODS: Archival data (N = 214) was used for this study and data were analyzed for 142 chronic pain patients reporting a traumatic experience and seeking treatment at a tertiary pain clinic in Korea. RESULTS: The results indicated that pain intensity, hyperarousal, and pain avoidance had significant direct effects on daily functioning. Also, pain intensity showed significant indirect effects on daily functioning through hyperarousal and pain avoidance; and hyperarousal through pain avoidance. CONCLUSIONS: Results suggest a direct contribution of high levels of pain, hyperarousal symptoms of PTSD, and pain avoidance behaviors to reduced daily functioning. Also, elevated pain as reminders of the trauma may trigger high levels of hyperarousal symptoms of PTSD. Subsequently, avoidant coping strategies may be used to minimize pain so that the trauma would not be re-experienced, thus inhibiting the activation of hyperarousal symptoms of PTSD. However, prolonged use of such strategies may contribute to decline in daily functioning.

Pharmacologic Management of Chronic Pain

Chronic pain is a multifactorial condition with both physical and psychological symptoms, and it affects around 20% of the population in the developed world. In spite of outstanding advances in pain management over the past decades, chronic pain remains a significant problem. This article provides a mechanism- and evidence-based approach to improve the outcome for pharmacologic management of chronic pain. The usual approach to treat mild to moderate pain is to start with a nonopioid analgesic. If this is inadequate, and if there is an element of sleep deprivation, then it is reasonable to add an antidepressant with analgesic qualities. If there is a component of neuropathic pain or fibromyalgia, then a trial with one of the gabapentinoids is appropriate. If these steps are inadequate, then an opioid analgesic may be added. For moderate to severe pain, one would initiate an earlier trial of a long term opioid. Skeletal muscle relaxants and topicals may also be appropriate as single agents or in combination. Meanwhile, the steps of pharmacologic treatments for neuropathic pain include (1) certain antidepressants (tricyclic antidepressants, serotonin and norepinephrine reuptake inhibitors), calcium channel alpha2-delta ligands (gabapentin and pregabalin) and topical lidocaine, (2) opioid analgesics and tramadol (for first-line use in selected clinical circumstances) and (3) certain other antidepressant and antiepileptic medications (topical capsaicin, mexiletine, and N-methyl-d-aspartate receptor antagonists). It is essential to have a thorough understanding about the different pain mechanisms of chronic pain and evidence-based multi-mechanistic treatment. It is also essential to increase the individualization of treatment.

Accuracy of Live Fluoroscopy to Detect Intravascular Injection During Lumbar Transforaminal Epidural Injections

BACKGROUND: Complications following lumbar transforaminal epidural injection are frequently related to inadvertent vascular injection of corticosteroids. Several methods have been proposed to reduce the risk of vascular injection. The generally accepted technique during epidural steroid injection is intermittent fluoroscopy. In fact, this technique may miss vascular uptake due to rapid washout. Because of the fleeting appearance of vascular contrast patterns, live fluoroscopy is recommended during contrast injection. However, when vascular contrast patterns are overlapped by expected epidural patterns, it is hard to distinguish them even on live fluoroscopy. METHODS: During 87 lumbar transforaminal epidural injections, dynamic contrast flows were observed under live fluoroscopy with using digital subtraction enhancement. Two dynamic fluoroscopy fluoroscopic images were saved from each injection. These injections were performed by five physicians with experience independently. Accuracy of live fluoroscopy was determined by comparing the interpretation of the digital subtraction fluoroscopic images. RESULTS: Using digital subtraction guidance with contrast confirmation, the twenty cases of intravascular injection were found (the rate of incidence was 23%). There was no significant difference in incidence of intravascular injections based either on gender or diagnosis. Only five cases of intravascular injections were predicted with either flash or aspiration of blood (sensitivity = 25%). Under live fluoroscopic guidance with contrast confirmation to predict intravascular injection, twelve cases were predicted (sensitivity = 60%). CONCLUSION: This finding demonstrate that digital subtraction fluoroscopic imaging is superior to blood aspiration or live fluoroscopy in detecting intravascular injections with lumbar transforaminal epidural injection.

A case of transient paraplegia following celiac plexus block with alcohol: A case report

A 61-year-old man who had cholangiocarcinoma with multiple metastasises was referred to our hospital for his pain control.Celiac plexus block with 99.9% alcohol was performed by the retrocrural approach under fluoroscopic guidance.Examination of the patient at fifteen minutes after successfully performing the diagnostic block showed no sensory or motor change.Forty-eight hours after the neurolysis, the patient's lower extremities were totally paralyzed, and he could not walk nor control his anal sphincter.But thereafter he progressively recovered.Five days after celiac plexus neurolysis, he was able to walk with support from one hand.Reversible ischemia of the spinal cord due to damage to the Adamkiewicz arterial blood supply was thought to be the cause.

Effect of 1 mg of prophylactic haloperidol for postoperative nausea and vomiting after gynecological laparoscopic surgery using IV patient controlled analgesia

BACKGROUND: Haloperidol, a major tranquilizer similar to droperidol, has been found to have a potent antiemetic effect on postoperative nausea and vomiting (PONV), but the supporting evidence was incomplete, especially in Korea.Therefore we evaluated the prophylactic effect of haloperidol on opioid-based IV patient-controlled analgesia (PCA) related PONV in susceptible patients after gynecological laparoscopic surgery. METHODS: Ninety-six adult women scheduled gynecological laparoscopic surgery were enrolled in a randomized, double-blinded and placebo study.Patients received haloperidol 1 mg (Group H) or saline (Group C) 30 min before the end of surgery.Fentanyl-based IV PCA was administered after surgery.The incidences and severity of nausea, vomiting, rescue antiemetic administration, pain, and adverse effects (cardiac arrhythmias and extrapyramidal effects) were assessed for 24 h after surgery.The sedation score was recorded in the post-anesthesia care unit for 2 h. RESULTS: The incidences and severity of nausea and the number of antiemetic administration were significantly lower in Group H than Group C (P < 0.05). But the sedation and pain score were similar. There was no QTc prolongation or extrapyramidal symptom in both groups. CONCLUSIONS: Prophylactic haloperidol 1 mg is effective in preventing PONV related to fentanyl-based IV PCA, with less adverse effects, in patients undergoing gynecological laparoscopic surgery.

Sacral Nerve Stimulation for Treatment of Chronic Intractable Anorectal Pain: A Case Report

Despite recent methodological advancement of the practical pain medicine, many cases of the chronic anorectal pain have been intractable. A 54-year-old female patient who had a month history of a constant severe anorectal pain was referred to our clinic for further management. No organic or functional pathology was found. In spite of several modalities of management, such as medications and nerve blocks had been applied, the efficacy of such treatments was not long-lasting. Eventually, she underwent temporary then subsequent permanent sacral nerve stimulation. Her sequential numerical rating scale for pain and pain disability index were markedly improved. We report a successful management of the chronic intractable anorectal pain via permanent sacral nerve stimulation. But further controlled studies may be needed.

Ganglion Impar Block With Botulinum Toxin Type A for Chronic Perineal Pain -A Case Report-

Chronic perineal pain is an often encountered problem, which produces a great degree of functional impairment and frustration to the patient and a challenge to the treating physician. The reason for this problem is that the region contains diverse anatomic structures with mixed somatic, visceral and autonomic innervations affecting bladder and bowel control and sexual function. A blockade of nociceptive and sympathetic supply to the perineal region, supplied through the ganglion impar has been shown to benefit patients with chronic perineal pain. Several options to this block have been described that chemical neurolysis, radiofrequency ablation etc. Although the analgesic effect of Botulinum toxin type A (BoNT-A) has long been considered secondary to its action for muscle relaxation, BoNT-A also affects the release of the neurotransmitters that are involved in pain perception. We describe a patient who was successfully given ganglion impar block with BoNT-A.