Articles: pain-clinics.
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Reflex sympathetic dystrophy (RSD) is a disease of the extremities that can be elicited by different factors, occurring at different sites (e.g., trauma, herpes zoster, myocardial infarction). Independently of its etiology, however, the clinical symptoms of RSD are found most often in distal parts of the extremities affected (hand or foot). In a generalized distribution pattern, the following signs, representing a triad of autonomic, motoric and sensory disturbances, are commonly observed in these regions: 1. dysregulation of blood flow to the skin and of sweating, together with diffuse swelling, 2. impairment of movement and muscular strength; 3. diffuse sensory skin disturbances and spontaneous pain of ariable character (e.g., burning, throbbing, aching, shooting). ⋯ This excitation, in turn, maintains the abnormal vasoconstrictor outflow via reflex mechanisms, thus initiating a vicious circle. Sympatholytic therapy can interrupt the abnormal vasoconstrictor outflow, leading to increased venous return and reducing interstitial pressure and nociceptor activation (interruption of the vicious circle). If sympatholytic therapy is applied early, full recovery may occur.
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Conventional clinical dosages of local anesthetics may not be sufficient to block conduction of all afferent impulses, which is important for an effective epidural sensory blockade. Further depression of the transmission of information can be accomplished by central modulating mechanisms, preventing sensory perception. Since there are interindividual differences in the quality of modulating mechanisms, standardized depression of impulse propagation by the local anesthetic is associated with a wide variation in the total depression of afferent impulses. ⋯ Patients with a low pain threshold require a more highly concentrated local anesthetic. The addition of opioids to the local anesthetic will permit the use of lower concentrations of the local anesthetic itself. Optimal use of diagnostic, prognostic, and therapeutic epidural blockades is possible only if the influence of modulating mechanisms is taken into account.
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Special aspects of pain in children are pointed out, and the range of relevant conditions and their frequency are compared with adult pain problems. Headache and especially migraine, with incidences of up to 50% and 10%, respectively, are the most common painful conditions to be treated in the pediatric age group. Many less frequent chronic painful disorders claim the need of special, mostly neuropediatric, knowledge; optimal diagnostic precision is important for good therapeutic results. ⋯ Another problem is that of pain assessment in infants and children; some new diagnostic tools, such as color scales and the Smiley analog scale, can help to solve these specific difficulties. Furthermore, the prediatrician accepts responsibility for the patients' future as adults and is therefore involved in the early prophylaxis of analgesic abuse. The actual and future work of pediatric pain clinics, the conditions in such institutions and the philosophy behind them are presented, and the necessity for research is pointed out.
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Patients operated because of lumbar disc herniations (104 patients) were included in a randomized double-blind study analyzing the influence of dexamethasone versus placebo on postoperative drug requirements and the pain score on the visual analogue scale. High doses of dexamethasone had been administered: 40 mg i.v. on the night before the operation; 8 mg intraoperatively topical perineural application; 8 mg i.v. in the evening of the day of operation; 2x8 mg i.m. on days 1 and 2 postoperatively; 2x4 mg i.m. on days 3 and 4; 4 mg po on day 5 and 6 postoperatively. A significant decrease in the requirement for analgesics was found in the drug-treated group, particularly male patients, and also an impressive reduction in the lumbar pain score. In conclusion, there was good alleviation of sciatic pain in the dexamethasone-treated group of females during the 1st week after operation, but we found no evidence that the agent tested had an influence on the clinical outcome 1 month following the operation.
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Clinical pain syndromes affecting the locomotor apparatus can become apparent not only in the form of nociceptive pain in the skeleto-mechanical system, but also as neurogenic pain emanating from lesions in the peripheral nerves or nerve roots or as referred pain resulting from disorders of visceral organs. The anatomical structure and basic innervation can contribute to the various characteristics of such deep pain. Within the spinal cord, visceral and somatic afferent fibres converge on nociceptive pathways, resulting in a uniform clinical pain syndrome. ⋯ There is no doubt that these drugs can help a great deal. However, they have only a symptomatic effect without any influence on the origin or course of the disease. Therefore, a critical evaluation of their benefits and risks is required before treatment with such drugs is instituted.