Die Erhöhung der Schmerzschwelle Durch Calcitonin

Possible mechanisms of the analgesic action of calcitonin

The analgesic activity of calcitonin is well established, both through clinical observation and specific experimental investigation. The mechanism involved, however, is still unclear, and the hypotheses that have been proposed range from a simple peripheral antiinflammatory action to a direct action on specific receptors in the central nervous system. The various hypotheses are briefly reviewed and some of the supporting evidence is presented. The conclusion is that the principal mechanism of calcitonin's analgesic effect is probably a direct central action, but that this is further supported by peripheral mechanisms that may also improve bone status locally.

Increase of axial and appendicular trabecular and cortical bone density in established osteoporosis with intermittent nasal salmon calcitonin therapy

The aim of this study was to examine the effect of intranasal administration of salmon calcitonin to a group of 24 postmenopausal women with severe, established osteoporosis (t score < -2.5 SD) and more than one vertebral fracture. The patients were treated with 200 IU of nasal salmon calcitonin daily for 2 months with a subsequent pause of 2 months (3 cycles) and 500 mg calcium daily over a total of 12 months in an open randomized study. The patients were compared with an age matched control group of 18 women of a similar clinical status who were treated with calcium and vitamin D only. In the nasal calcitonin treatment group an increase in the trabecular axial bone density of 2.8% was achieved, as well as increase in trabecular appendicular (forearm) bone density of 1.6%, together with a cortical bone density increase of 1.8% axial and 1% appendicular. Initially, elevated values of urinary deoxypyridinoline were found in 12 women in the nasal calcitonin treatment group; these levels returned to normal under salmon calcitonin nasal therapy and documented the inhibition of increased osteoclastic activity. Cyclic intermittent calcitonin nasal therapy led to a general increase in trabecular and cortical axial and appendicular bone density, marked alleviation of the subjective sensation of pain, and a reduction in the daily dose of accompanying nonsteroidal anti-inflammatory drugs by 50%.

Prophylaxis of falls and treatment of fractures

This review has highlighted important preventive measures for falls and fractures in elderly osteopenic patients, and has discussed the therapeutic possibilities after an osteoporotic fracture has occurred. Assuming that a large proportion of osteoporotic fractures are a consequence of traumatic falls, and are not spontaneous, due to osseous weakness, preventive measures in elderly people are best directed to counteract muscular weakness, improve agility and correct visual impairment. It is also important to guard against unnecessary obstacles in the home and the reflex habits of doctors to prescribe hypnotics and tranquillizers, as well as their occasional tendency to overtreat hypertension. Practical examples of rational measures to protect against these causes of fractures have been given. In the second part of the review, the treatment of fractures has been delineated. The goals are adequate pain relief, early immobilization of the patient, avoidance of overtreatment and fast restoration of the quality of life. Three stages of pain relief by drugs are outlined. The first consists of a simple non-narcotic analgesic, such as paracetamol. In a second stage, either the combination of paracetamol with a muscle relaxant or the administration of a narcotic analgesic of medium potency is proposed. As a third stage, several therapeutic approaches to the administration of potent narcotic analgesics have been discussed. Non-drug measures, such as the use of heat, ultra-soft mattresses, walking frames, crutches and sticks, as well as active forms of physiotherapy, have been discussed both in terms of pain relief and early mobilization.