Articles: chronic-pain.
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Spinal cord stimulation is the most common mode of neuromodulation used in managing chronic low back pain. It is minimally invasive and reversible as opposed to nerve ablation. The basic scientific background of the initial spinal cord stimulation trials was based on the gate control theory of Melzack and Wall. ⋯ There is substantial scientific evidence on the efficacy of spinal cord stimulation for treatment of low back and lower extremity pain of neuropathic nature. Clinical studies revealed a success rate of from 50% to 70% with spinal cord stimulation, with decreased pain intensity scores, functional improvement and decreased medication usage. This review discusses multiple aspects of spinal cord stimulation, including pathophysiology and mechanism of action, rationale, indications, technique, clinical effectiveness, and controversial aspects.
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Many commissions and groups throughout the world have proposed clinical guidelines on the management of low back pain, spinal pain, and chronic pain. Practice guidelines are systematically developed statements to assist the practitioner and patient decisions about appropriate healthcare for specific clinical circumstances. The American Society of Interventional Pain Physicians developed practice guidelines for interventional techniques which are professional practice recommendations for practices for prevention, diagnosis and treatment of acute and chronic painful disorders, and in some cases, disability management. ⋯ The results consistently showed decrease in number of visits from 1999 to 2000 and 2001 with 5.5 +/- 0.18, 5.1 +/- 0.17, and 4.3 +/- 0.15 respectively. The average expenditure also decreased from per visit of $872 in 1999 to $891 in 2000, to $810 to 2001. further, the average expenditure per year also decreased as expected due to decrease in frequency of visits, as well as the average expenditure per visit from $4751 +/- $231 in 1999 to $4505 +/- $214 in 2000 and to $3514 +/- $193 in 2001 even without consideration of inflation. Thus, it is concluded that guidelines describing the interventional techniques in the management of chronic pain are effective in reducing the cost and frequency of visits with improvement or at least maintenance of similar outcomes, physician decision making abilities, and patient preferences.
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This study was designed to evaluate psychological status of 150 individuals; 50 without chronic pain and without psychotherapeutic drug therapy, Group I or control group; 50 patients with chronic pain, Group II, chronic pain group with involvement of one region; and 50 chronic pain patients with involvement of two or more regions, Group III. All the participants were tested utilizing Millon Clinical Multiaxial Inventory -III (MCMI-III). Results were analyzed and compared for various clinical personality patterns including personality traits and personality disorders; severe personality pathology for schizotypal, borderline and paranoid personality pathology; and multiple clinical syndromes including generalized anxiety disorder, somatization disorder, major depression, bipolar manic disorder and dysthymic disorder, etc. ⋯ In the analysis of clinical syndromes, generalized anxiety disorder, somatization disorder, and depressive disorders were seen in a progressively greater proportion of patients in Groups I to III. In conclusion, this evaluation showed that abnormal clinical personality patterns are present in both groups of patients. Psychological abnormalities with generalized anxiety disorder, somatization disorder, and depression are commonly seen in chronic pain patients.
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Multiple studies have documented a strong association between chronic low back pain and psychopathology including personality disorders, depressive disorders, anxiety, and somatoform disorders along with non-specific issues such as emotion, anger and drug dependency. However, depression, anxiety and somatization appear to be crucial. There are no controlled trials in interventional pain management settings. ⋯ All the participants were tested utilizing Pain Patient Profile (P3). Significant differences were found among various clinical syndromes with generalized anxiety disorder, somatoform disorder, and depression, with 0% vs 20%, 0% vs 20%, and 5% vs 30% in Group I and Group II consecutively. This evaluation showed that clinical syndromes were seen in a greater proportion of patients with chronic low back pain emphasizing the importance of evaluation of the patients for generalized anxiety disorder, somatoform disorder, and for depression.
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This paper reports on 80 patients using dual electrode, spinal cord stimulation (SCS) over a four-year period Implant status, stimulation mode, anode-cathode configuration (array), cathode position, paresthesia overlap, explantation rates, complications, Visual Analog Scores (VAS), and overall satisfaction were examined in patients implanted with dual 8 contact, staggered, percutaneous electrodes. All patients had undergone implantation for chronic axial and extremity pain [e.g., Failed Back Surgery Syndrome (FBSS), Complex Regional Pain Syndrome (CRPS)]. Outcomes were evaluated in view of our previous reports in this same group at 24 and 30 months (1,2). ⋯ Thirty-five percent of patients with thoracic implants achieved paresthesia in the low back at 48 months. Explantation rates and overall patient satisfaction were significantly affected by painful radio frequency (RF) antenna coupling. This data supports the efficacy of dual electrodes in optimizing long-term SCS paresthesia overlap and complex pain outcomes.