Chronic Pain Syndrome Patients Research Articles

Modern view of mechanisms of chronic pain syndrome in patients with knee joint damage

Modern view of mechanisms of chronic pain syndrome in patients with knee joint damage

Problems of diagnosis and treatment of chronic pain syndrome in patients with variants of the structure of peripheral nerves. A series of clinical cases

AIM: To assess the presence of variants of the structure of peripheral nerves as possible risk factors for chronic pain syndrome on the example of a series of clinical cases.
 MATERIALS AND METHODS: The systematization and analysis of data from domestic and foreign literature on pathophysiology, clinic, diagnosis and treatment of complex regional pain syndrome has been carried out. Research method: system analysis, presentation of a series of clinical cases.
 RESULTS: A series of clinical cases is presented. The main risk factors for chronic pain syndrome are presented. The conditions and diseases that need to be differentially diagnosed if complex regional pain syndrome is suspected are systematized: tunnel syndromes (carpal tunnel syndrome), diabetic polyneuropathy, HIV polyneuropathy, postherpetic neuralgia, neurogenic claudication/lumbar stenosis, central post-stroke pain, upper thoracic syndrome apertures.
 CONCLUSION: Today, practitioners and neurophysiologists are not sufficiently aware of the existence of interneural anastomoses and features, typical electroneuromyographic signs, as a result of which in most cases the obtained electroneuromyographic data are interpreted erroneously. Variants of the structure of nerves can give an incorrect clinical picture of the condition of peripheral nerves and lead to untimely diagnosis and treatment of chronic pain syndrome, complex regional pain syndrome. Improvements in diagnostic methods, as well as widely introduced high-tech examination methods, in particular electroneuromyography, magnetic resonance imaging and ultrasound, are helping to increase the frequency of detection of abnormalities in the structure of peripheral nerves. In the presented clinical cases, patients had structural variants that gave an incorrect clinical picture of the condition of the peripheral nerves and led to untimely diagnosis and treatment — the development of chronic pain syndrome.

Cryoablation of the adenohypophysis in the treatment of chronic pain syndrome in patients with stage IV malignant neoplasms

Background. The data of the European Society For Medical Oncology (ESMO) indicate that 64.0% of cancer patients with the fourth stage of cancer have chronic pain syndrome, which is the main factor that significantly affects the quality of life. In 46.0% of patients, it is not possible to obtain a stable analgesic effect with modern methods of analgesia, including interventional methods and pharmacotherapy. Refractory oncological pain stimulates the search for new methods of pain relief.
 Purpose – retrospective assessment of the effectiveness of the selective stereo- tactic transnasal transsphenoidal cryoablation of the adenohypophysis in the treatment of chronic pain syndrome in patients with stage IV malignant neoplasms.
 Materials and methods. 45 microsurgeries were performed – stereotactic selective transnasal transsphenoidal cryoablation of the adenohypophysis with endoscopy. Over the period from 2014 to 2018, 45 patients with stage IV malignant hormone- dependent neoplasms of various somatic organs and chronic pain syndrome underwent microsurgery.
 Results. The analgesic effect appeared 4–6 hours after the microsurgery. In 95.6% of patients, an analgesic effect was achieved to a greater extent (according to the numeric rating scale (NRS) for pain, its intensity decreased from 7–9 points to 1–3 points); in other patients, the analgesic effect was achieved to a lesser extent (according to the NRS, pain intensity decreased from 7–9 points to 3–5 points), regardless of the condition and age of the patient. Accordingly, the dosage was reduced or opioid analgesics were discontinued. Severe complications after the cryoablation of adenohypophysis, such as meningitis, diabetes insipidus, and hypopituitary syndrome were not observed. In the postoperative period, three patients were treated for mild hypopituitary syndrome, and two patients were treated for liquorrhea with conservative therapy for 3–5 days.
 Conclusions. Stereotactic selective transnasal transsphenoidal cryoablation of the adenohypophysis is an effective microsurgery in the treatment of chronic pain syndrome in stage IV cancer patients. It improves the patient’s condition and quality of life. The analgesic effect appears in the first hours after surgery. Due to the use of cryoprobes with a diameter of 1.2 mm and 1.8 mm, the surgery is minimally traumatic and can be performed on patients in critical condition.

Celiac plexus neurolysis in treatment of chronic pain syndrome in patients with unresectable pancreatic cancer

Celiac plexus neurolysis in treatment of chronic pain syndrome in patients with unresectable pancreatic cancer

Etiological factors of chronic pain syndrome in young adults with post-coronavirus disease 2019 condition.

The coronavirus disease 2019 (COVID-19) generates long-term sequelae, but studies investigating patients with chronic pain syndrome (CPS) are limited. This study aimed to establish the etiological factors of CPS in patients with post-COVID-19 conditions. This was a case-control retrospective study. The predictor variables were sex, diabetes mellitus, obesity (predisposing factors), unfavorable socioeconomic conditions, impaired rehabilitation (disabling factors), repeated exposure to COVID-19 (precipitating factor), home isolation, stress overload, fear of dying, admission to intensive care unit, prone positioning, and use of medications (reinforcing factors). The outcome variable was the presence of CPS. This study included 120 individuals. Prolonged days of isolation (p=0.005), fear (p<0.001), stress overload (p<0.001), and impaired rehabilitation (p=0.003) were significantly associated with CPS. A significant relationship was found between prolonged days of isolation, fear, stress overload, impaired rehabilitation, and CPS. The study findings can assist nurses by promoting their knowledge of the causes of CPS and supporting the care planning needs of patients with post-COVID-19 conditions, in addition to promoting the use of the NANDA-International taxonomy.

Regression of chronic pain syndrome refractory to opioid pharmacotherapy in a patient after implantation of a spinal cord neurostimulator: case report

BACKGROUND: Pain in cancer patients, often poorly treated, cause severe distress for patients and their caregivers, and significantly reduces quality of life. Modern guides for the medical treatment of chronic pain in cancer patients are not effective in all cases, especially when chronic neuropathic pain syndrome occurs. In this regard, there is a need for a multidisciplinary personalized approach to the tactics of chronic pain management in favor of surgical methods at earlier stages of this condition. Nowadays neuromodulation is widely used for the treatment of neuropathic chronic pain syndrome in patients with various pathologies, whereas it is not used routinely in cancer patients.&#x0D; CLINICAL CASE DESCRIPTION: We introduce a case report of successfully applied neuromodulation in patient with severe chronic pain syndrome due to rectal cancer. Epidural spinal cord stimulation at Th10Th12 levels allowed to stop the systemic use of opioids and achieve long-term remission. Spinal cord stimulation has shown itself to be very promising and significantly improved patients quality of life.&#x0D; CONCLUSIONS: Our case report evidently shows that current chronic pain management guides and treatment recommendations needs a revision and neuromodulation usage in category of cancer patients should be considered.

Prevalence of chronic pain syndrome in patients who have undergone hallux valgus percutaneous surgery: a comparison of sciatic-femoral and ankle regional ultrasound-guided nerve blocks

BackgroundChronic pain syndrome (CPS) is a common complication after operative procedures, and only a few studies have focused on the evaluation of CPS in foot-forefoot surgery and specifically on HV percutaneous correction. The objective of this study was to compare postoperative pain levels and incidence of CPS in two groups of patients having undergone femoral-sciatic nerve block or ankle block regional anaesthesia before hallux valgus (HV) percutaneous surgery and the association between postoperative pain levels and risk factors between these patient groups.MethodsA consecutive patient series was enrolled and evaluated prospectively at 7 days, 1, 3 and 6 months after surgery. The participants were divided into two groups according to the regional anaesthesia received, femoral-sciatic nerve block or ankle block, and their outcomes were compared. The parameters assessed were postoperative pain at rest and during movement by the numerical rating scale (NRS), patient satisfaction using the Visual Analogue Scale (VAS), quality of life and return to daily activities. Statistical analysis was performed.ResultsOne hundred fifty-five patients were assessed, 127 females and 28 males. Pain at rest (p < 0.0001) and during movement (p < 0.0001) significantly decreased during the follow-ups; at 6 months, 13 patients suffered from CPS. Over time, satisfaction remained stable (p > 0.05), quality of life significantly increased and patients returned to daily activities and work (p < 0.0001). No significant impact of type of anaesthesia could be detected. ASA 3 (p = 0.043) was associated to higher pain during movement; BMI (p = 0.005) and lumbago (p = 0.004) to lower satisfaction. No operative-anaesthetic complications were recorded. Postoperative pain at rest and during movement improved over time independently of the regional block used, with low incidence of CPS at last follow-up. Among risk factors, only a higher ASA was associated to higher pain during movement, while higher BMI and lumbago to lower satisfaction.ConclusionsBoth ultrasound-guided sciatic-femoral and ankle blocks were safe and effective in reducing postoperative pain with low incidence of CPS at last follow-up.Trial registrationClinical Trial NCT02886221. Registered 1 September 2016.

Pharmacoeconomic analysis of the application of strong opioids for the treatment of chronic pain syndrome in patients with pancreatic cancer

Objective: to evaluate the clinical and economic feasibility of opioid therapy based on the analysis of its cost and effectiveness in patients with chronic pain syndrome in pancreatic cancer.Material and methods. An observational prospective study in parallel groups of patients with chronic pain syndrome associated with pancreatic cancer was carried out. The analysis of cost minimization and cost-effectiveness was applied, as well as pharmacoeconomic modeling, which included the construction of a decision tree in patients receiving morphine sulfate (n=45) and fentanyl TTS (n=45) for pain relief. The sensitivity of the obtained data was assessed using one-way analysis.Results. It was shown that the treatment of chronic pain syndrome in patients with pancreatic cancer with opioid analgesics as part of combined treatment is the least expensive in the morphine sulfate group (incremental cost-effectiveness ratio 144.93). Based on the results of modeling, the prognostic factors of influence on the cost of analgesic therapy were determined: the cost of combined analgesic therapy, the cost of treatment of adverse reactions, and the cost-effectiveness ratio.Conclusion. Analgesic therapy of chronic pain syndrome with morphine sulfate in patients with pancreatic cancer is pharmacoeconomically feasible.

Влияние уровня противовоспалительного гормона кортизола в сыворотке крови на частоту возникновения хронического болевого синдрома у больных после торакотомии в зависимости от использованных методов послеоперационного обезболивания

Актуальность. При торакотомии повреждение тканей сопровождается повышением в крови маркеров воспаления, которые влияют на развитие хронического болевого синдрома. Цель исследования: изучить влияние различных методов послеоперационного обезболивания на состояние гормонов гипофизарно-надпочечниковой системы (гормонов стресса) и иммуноцитокиновый статус у больных после торакотомии. Материалы и методы. 85 больных после торакотомии были распределены на три группы. Обезболивание проводили с помощью пролонгированной паравертебральной аналгезии (ПВА) (n = 19) и пролонгированной эпидуральной аналгезии (ЭДА) (n = 36) 0,2% раствором ропивакаина, в контрольной группе (n = 30) — внутривенной контролируемой пациентом аналгезией (КПА) раствором морфина. В течение трех суток после операции исследовали уровни глюкозы крови, инсулина, интерлейкина (IL)-6, кортизола, фибриногена и С-реактивного протеина. Для оценки влияния различных методов обезболивания на формирование хронической боли проводили опрос больных через 6 месяцев после торакотомии. Результаты. У больных всех исследуемых групп в течение 72 часов послеоперационного периода сохранялась нормогликемия. Максимальный рост уровня инсулина наблюдался в контрольной группе на третьи сутки послеоперационного периода и составлял 62,54 ± ± 5,56 мкМЕ/мл. В опытных группах уровень инсулина также повысился, но был значительно ниже контрольной группы. Максимальный подъем уровня IL-6 наблюдался в первые сутки послеоперационного периода во всех трех группах и был следующим: в контрольной группе — 81,63 ± 38,40 пг/мл, в группе ЭДА — 70,69 ± 27,29 пг/мл, в группе ПВА — 80,12 ± 25,14 пг/мл. На третьи сутки уровень IL-6 снижался и был примерно одинаковым во всех группах. Максимальное увеличение С-реактивного протеина наблюдалось в контрольной группе — с 0,05 ± 0,02 мг/дл до 1,53 ± 0,60 мг/дл. В группе ЭДА — с 0,38 ± ± 0,23 мг/дл до 2,34 ± 0,84 мг/дл, в группе ПВА — с 0,32 ± ± 0,16 мг/дл до 2,14 ± 0,95 мг/дл. Уровень кортизола в группе ПВА через 24 часа после операции увеличился с 16,80 ± 2,33 мкг/дл до 27,78 ± 7,92 мкг/дл. В других исследуемых группах уровень кортизола оставался практически неизменным. Через 72 часа послеоперационного периода наиболее выраженная противовоспалительная реакция сохранялась в группе ПВА, где уровень кортизола составил 25,95 ± 7,87 мкг/дл (в контрольной группе — 23,64 ± 3,01 мкг/дл; в группе ЭДА — 23,26 ± 3,06 мкг/дл). В контрольной группе хроническая боль развилась через 6 мес. у 8 больных (53 %); в группе ЭДА — у 5 больных (33,3 %); в группе ПВА — у 3 больных (20 %). Выводы. Во всех группах наблюдались стабильные показатели гликемии. Уровень инсулина в контрольной группе был значительно выше. Применение ПВА и ЭДА обеспечивало лучшее стресс-протективное действие, но приоритет оставался за ЭДА. Динамика уровня кортизола показала, что наиболее выраженная системная противовоспалительная реакция наблюдалась в группе ПВА. Отмечена заметная связь между частотой возникновения хронического болевого синдрома, качеством обезболивания и уровнем кортизола плазмы крови в раннем послеоперационном периоде.

Распространенность депрессивных симптомов у пациентов с хронической пояснично-крестцовой радикулопатией

Study Objective: To study the prevalence of depressive syndromes in patients with chronic lumbosacral radiculopathy and pain syndrome, and to identify correlations between neuropathic pain and psychoemotional disturbances. Study Design: open perspective study. Materials and Methods. The study included 126 patients (45 (35.7%) males and 81 (64.3%) females) of 19 to 78 years old with verified unilateral lumbosacral radiculopathy of L4, L5, S1 radicules resulting from degenerative damage of the spine lasting for more than 12 weeks. For assessment, we used the Pain Detect Questionnaire, visual analogue scale for pain syndrome, Oswestry Disability Index, and Beck Depression Inventory. Study Results. Among patients with chronic lumbosacral radiculopathy, depressive syndromes were diagnosed in 74 (587%) cases as follows: 26 (20.6%) patients had mild (subclinical) depression, 33 (26.2%) cases were of moderate intensity, 12 (9.5%) patients had marked, and 3 (2.4%) had severe depression. We used Spearmen’s rank-order correlation to identify statistically significant correlations between Beck Depression Inventory score and neuropathic pain syndrome intensity (Pain Detect Questionnaire) (r = 0.861; p = 0.006). Pain Detect Questionnaire and Oswestry score correlated as well (r = 0.745; p = 0.001). Conclusion. Chronic pain syndrome in patients with lumbosacral radiculopathy resulting from degenerative damage of the spine is characterised by high comorbidity with depression. The results justify inclusion of psychoemotional assessment into a routine screening program for patients with lumbosacral radiculopathy. Keywords: depression, chronic back pain, lumbosacral radiculopathy, neuropathic pain syndrome.

Predicting Opioid Therapy Safety In Pancreatic Cancer Patients

Background — Obligatory use of strong opioids for treating chronic pain syndrome in patients with pancreatic cancer provides the implementation of opioid-associated adverse reactions. Genetic and non-genetic risk factors are predictive of the opioid therapy safety. Contemporary methods of information analysis allow using prognostic risk models for practical application. Objective — Identification of significant risk factors for the development of opioid-associated adverse drug reactions in patients with chronic pain syndrome against the background of pancreatic cancer. Material and Methods — The study included 90 patients with chronic pain against the background of pancreatic cancer, randomized at a ratio of 1: 1. Group 1 received morphine sulfate (MS), group 2 received fentanyl transdermal therapeutic system (FTTS) with standard adjuvant therapy (ketoprofen, diazepam, amitriptyline). To assess pain level, the 10-point Digital Rating Scale, the Visual Analogue Scale and the pain questionnaires were used. The assessment of the treatment safety was conducted by the Naranjo Scale. Assessment of prognostic genetic and non-genetic factors was carried out using ROC analysis with calculation of AUC (the area under the ROC-curve). Results — Prognostic models of good quality were determined with the optimal ratio of sensitivity and specificity for the influence of genetic and non-genetic risk factors on the development of opioid-associated adverse drug reactions (OA-ADRs) in comparison groups. Various prognostic factors, complementing each other, were identified in the comparison groups. Conclusion — The following OA-ADRs predicting factors were identified: for FTTS-associated nausea and vomiting – age and carriage of rs7438135 AG genotype of UGT2B7 gene; for local reactions – the sum of points on the ESAS scale and carriage of rs7438135 AA genotype of UGT2B7 gene; for difficulty urinating – the level of glomerular filtration rate; for neurotoxicity – the level of AST and bilirubin, and the carriage of rs1128503 GG genotype of ABCB1 gene; for pruritus – carriage of rs1045642642 AA genotype of ABCB1 gene. The prognostic factors for the implementation of MS-associated neurotoxicity were age and comorbidity; for dry mouth was predicted best from the sum of points on the MMCE scale; weakness was predicted by the carriage of rs7668258 TT genotype of UGT2B7 gene.

P118 Orthopaedic surgical interventions in a cohort of patients with hypermobility related disorders, compared with chronic pain syndrome patients in a tertiary referral centre

Abstract Background Mechanisms of pain associated with hypermobility are poorly understood and include nociceptive pain due to structural joint changes, neuropathic pain due to disrupted proprioception, muscle weakness and central sensitisation. The influence of anxiety and low mood is also unknown. There is limited published evidence regarding orthopaedic interventions in hypermobile patients particularly following the updated 2017 Ehlers-Danlos syndrome (EDS) classification criteria. We aimed to evaluate the characteristics of a hypermobility patient cohort who had received surgical interventions and compare these with a patient population with chronic pain syndromes. Methods A retrospective analysis of medical records was conducted of patients attending a tertiary referral centre (University College London Hospital) between January 2018 and December 2018. A hypermobility-related disorders cohort was compared with a cohort of patients with chronic pain syndrome, including fibromyalgia (but without any evidence of hypermobility). Results There were 350 patients (300 females, 50 males) in the hypermobility cohort with a mean age of 36 years (range 18-71 years) at time of clinic review. 63% had hypermobility spectrum disorder or hypermobility syndrome and 37% had EDS (hypermobile, classic, vascular and other rare types). 24% of hypermobile patients had undergone orthopaedic interventions. The Beighton score did not correlate with surgical procedures. 134 patients (121 females, 13 males) with chronic pain syndromes were identified, with a mean age of 51 years (range 26-85 years). 16% of chronic pain patients had received orthopaedic surgery. 76% of hypermobile patients who had orthopaedic interventions were under 50 years old, compared to 23% in the chronic pain cohort. The total number of surgical procedures in the hypermobility cohort was 227 (0.6485 interventions per patient) compared with 25 in the chronic pain cohort (0.1865 interventions per patient); relative risk 3.477 (95% CI 2.42-4.99; P &amp;lt; 0.0001, chi-squared test). 33% of hypermobile patients had surgery on two or more joint groups (including 8 patients who had surgery in four or more joint groups), whereas 95% of chronic patients had surgery on only one joint group. In the hypermobile group the knee (23%) and hips (24%) were the most common site of operative intervention; however in the chronic pain cohort the most common sites were the knee (32%), spine (20%) and shoulders (20%), with only 4% requiring hip surgery. Conclusion Patients with hypermobility have a greater number of surgical procedures at multiple joint sites and at a younger age than patients with chronic pain syndromes, suggesting that mechanical pathology (rather than pain alone) and anticipated surgical success may contribute to the need for surgical intervention. The Beighton score does not appear to be a reliable predictor of surgical intervention. Earlier diagnosis and a holistic, non-operative approach, including physiotherapy and pain management, may reduce the need for surgical procedures. Disclosures S. Wright None. P. Mehta None. A. Rahman None. H. Kazkaz None.

Efficiency and safety of opioid therapy of chronic pain syndrome in patients with cancer of the refractory iron: clinico-pathogenetic features

Aim. To study the influence of clinical and pathogenetic factors in patients with pancreatic cancer on the efficacy and safety of analgesic therapy of chronic pain syndrome.Materials and methods. Clinical features of formation of chronic pain syndrome predetermining the efficacy and safety of analgesic therapy were studied in 82 patients with pancreatic cancer.Results. The efficacy and safety of opioids in the comparison groups of morphine sulfate, fentanyl TTC and oxycodone / naloxone in patients with pancreatic cancer was shown.

The influence of anesthesia and analgesia on the formation of chronic pain syndrome in patients undergoing total knee or hip arthroplasty. Article

Introduction. Total knee and hip replacement surgery for stages 3–4 of osteoarthritis often complicated by chronic postoperative pain syndrome (CPOP). Objectives. The aim of the study was to choosing anesthesia that lid to decries the incidence of CPOP. Materials and methods. The study included 104 patients over 65 years old who underwent total knee or hip arthroplasty. Patients were divided into two groups: combined spinal-epidural anesthesia and extended epidural analgesia (CSEA) — 53 patients; general anesthesia and multicomponent postoperative analgesia (GA) — 51 patients. The Western Ontario MacMaster (WOMAC) scale and The Douleur Neuropathique 4 Questions (DN4) scale was used. Indicators were evaluated in 3, 6 and 12 months after surgery. We also assess the area of the hyperalgesia zone in the early postoperative period. Results. The WOMAC score was 85.7 ± 9.99 points in the CSEA group and 99.0 ± 11.68 in the GA group 3 months after surgery (p &lt; 0.01), 81.3 ± 10.19 versus 93, 8 ± 11.31 after 6 months (p &lt; 0.01) and 78.7 ± 10.48 versus 89.9 ± 10.77 after a year (p &lt; 0.01). The formation of CPOP was observed in 16 (15.4 %) patients, 4 (7.5 %) patients in the CSEA group and 12 (23.53 %) patients in the GA group (p &lt; 0.05). The neuropathic component of chronic pain was observed in 10 (62.5 %) patients, somewhat less often in the CSEA group (p &gt; 0.05). In patients with advanced CPOP, it was noted that the area of the secondary hyperalgesia zone in the first two days after surgery was significantly larger. The hyperalgesia zone was significantly smaller in patients with CSEA. Conclusions. Performing knee or hip joint replacement using CSEA compared with GA without a regional component is associated with a lower risk of developing CPOP syndrome and better functional rehabilitation.

Place of hypovitaminosis D in the formation of chronic pain syndrome in patients with persistent idiopathic facial pain

Place of hypovitaminosis D in the formation of chronic pain syndrome in patients with persistent idiopathic facial pain

Chronic pain syndrome in patients with pancreatic cancer: individual therapy and its pathogenetic background

Chronic pain syndrome in patients with pancreatic cancer: individual therapy and its pathogenetic background

Prolonged paravertebral analgesia in therapy of chronic pain syndrome in critical lower-limb ischaemia

Chronic pain syndrome in patients presenting with lower-limb critical ischaemia may have considerable significance in progression of the degree of limb ischaemia, and quality of life of patients appears to be largely determined by adequate analgesia. Currently, there is no 'gold standard' of therapy for chronic pain syndrome in critical lower-limb ischaemia, which makes it necessary to search for new effective and safe methods of analgesia. The purpose of this study was to evaluate efficacy and safety of paravertebral analgesia compared with epidural analgesia in therapy of chronic pain syndrome in critical lower-limb ischaemia. Our prospective randomized double-centre study included a total of 40 patients suffering from atherosclerotic-genesis critical lower-limb ischaemia and pronounced unilateral pain syndrome. The patients were randomized into two equal groups comprising 20 patients each. They were comparable by the main clinical and demographic parameters, as well as by the scope of the comprehensive treatment performed. In the study group, therapy of chronic pain syndrome was provided by the method of paravertebral analgesia, with the comparison group patients receiving epidural analgesia. Paravertebral analgesia was performed with the use of ultrasound navigation, in the prolonged mode by means of using microinfusion elastomeric pumps, epidural analgesia - according to the standard technique. The use of various methods of analgesia was accompanied by a decrease in chronic pain syndrome according to the visual analogue scale by 60% within the first 24 hours, and by 65% at 72 hours thereafter, with the differences being statistically insignificant. The use of prolonged paravertebral analgesia was accompanied by neither considerable haemodynamic reactions nor the development of the motor block, however requiring significant expenditure of a local anaesthetic. The conclusion was drawn that paravertebral analgesia in lower-limb critical ischaemia turned out to be a safe and efficient method of comprehensive therapy of chronic pain syndrome.

Factors of adverse prediction of application of spinal cord stimulation with chronic pain syndrome in patients with critical lower limb ischemia

To study the clinical dynamics in the long-term period after spinal cord stimulation (SCS) in patients with chronic pain syndrome and critical lower limb ischemia (CLLI) and to identify factors affecting the prognosis of SCS. The clinical dynamics was analyzed in 48 patients with pain syndrome and CLLI 1 year after SCS. Microcirculatory blood flow (MBF) was studied in the affected foot by laser-doppler flowmetry (LDF) (Perfusion Units (PU)) and transcutaneous oximetry (TcpO2, mmHg.) using an occlusive test before and after SCS. The factors associated with negative clinical dynamics 1 year after SCS were determined. In 74% of cases, SCS contributes to the improvement of clinical status (reduction of pain syndrome, increase in motor activity, healing of ulcers). After SCS, according to LDF and TcpO2, the authors observed an increase in MBF and tissue metabolism - from 1.3 (0.7-2.8) to 6.2 (3.8-8.7) PU and from 14.5 (7.5-22.1) to 41.1 (26.4-57.6) mmHg, respectively with normalization of the MBF reserve during the occlusion test. Negative clinical dynamics after SCS is associated with high comorbidity, TcO2 <10 mmHg and the duration of pain. SCS contributes to the improvement of the clinical status of patients with chronic pain syndrome and CLLI. The negative dynamics is associated with high comorbidity, TcrO2 <10 mmHg and the duration of pain.

Особенности хронического болевого синдрома у больных анкилозирующим спондилоартритом

Особенности хронического болевого синдрома у больных анкилозирующим спондилоартритом

Prognostic models of the severity of acute dynamic pain on the first postoperative day and the likelihood of chronic postoperative pain in spine surgery

To define the prognostic parameters of acute pain severity and the risk of CPS in patients operated on for spinal diseases and injuries. The study included 291 patients operated on for degenerative diseases and injuries of the spine at the Sklifosovsky Research Institute of Emergency Medicine in 2010-2016. Sociodemographic and clinical data and the psychological status of patients were evaluated. A mechanical algometer was used to measure the pain threshold (PT) and pain tolerance. The movement pain intensity was assessed by using a visual analog scale (VAS) on the day of surgery. Pain was considered minor at a median score of 0-4 cm and severe at a median score of 5-10 cm. The presence of CPS was assessed during a telephone survey 5-7 months after surgery. The gender, PT, dynamic pain intensity before surgery, and expectation of postoperative pain are risk factors for severe acute postoperative pain. A multinomial logit regression model (Hosmer-Lemeshow test - 4.322; p=0.827) predicts minor dynamic pain on the 1st postoperative day with an accuracy of 70% (95% CI 63-76). The age and dynamic pain intensity on the 1st postoperative are the risk factors for CPS; the multinomial logit regression model (Hosmer-Lemeshow test - 3.1; p=0.928) predicts CPS with an accuracy of 65% (95% CI 59-71) 5-7 months after surgery. The developed software in the form of MS Excel calculators provides a particular patient with preoperative assessment of the risk for minor acute dynamic pain on the 1st postoperative day and CPS 5-7 months after surgery.