Vascular and stimulation delays in dynamic musculoplasty
| Autor: | Hans A. Keizer, Bastiaau P Geerdes, Cor G. M. I. Baeten, Gerard Freling, Erik Heineman, Jean Woloszko |
|---|---|
| Rok vydání: | 1997 |
| Předmět: |
Muscle tissue
Male medicine.medical_specialty Contraction (grammar) Stimulation Internal medicine medicine Animals Type i muscle fibers Muscle Skeletal Lagomorpha biology business.industry Histocytochemistry Anatomy biology.organism_classification Time optimal Musculoplasty Electric Stimulation Plastic surgery medicine.anatomical_structure Muscle Fibers Slow-Twitch Cardiology Surgery Female Collagen Rabbits business Muscle Contraction |
| Zdroj: | Surgery. 121(4) |
| ISSN: | 0039-6060 |
| Popis: | Dynamic musculoplasty is increasingly being used to replace severely damaged muscle. Electrical stimulation induces a change in muscle composition from type II to type I muscle fibers. The aim of this study was to assess the optimal time to start stimulation and the beneficial effect of a vascular delay.Both gracilis muscles in rabbits (n = 3 x 6) were wrapped around a double polyurethane tube, and leads were implanted together with a neurostimulator. Right muscles were electrically stimulated for 11 weeks, and left muscles served as controls. In group 1 the muscle was stimulated immediately after transposition, in group 2 it was stimulated after 6 weeks, and in group 3 a vascular delay was performed and stimulation was started immediately after transposition.During stimulation the percentage of type 1 muscle fibers increased from a mean of 4.6% to 41.9%. In group 1 there was significantly more change in muscle tissue. There were no significant differences in recorded pressures between groups. In group 1 the increase in amplitude during stimulation was significantly elevated (p0.05). The fatigue index in group 1, 259 (SE 130) seconds, was significantly lower than that of group 2, 515 (SE 102) seconds (p0.05).Compared with the methods used in groups 2 and 3, immediate stimulation (group 1) gives more change in muscle tissue, demanding a higher increase in amplitude to achieve sufficient contraction. The fatigue index is also impaired. Thus vascular delay, as presently applied, does not improve muscle function. |
| Databáze: | OpenAIRE |
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