ABSTRACT
BACKGROUND: Although ionizing radiation has been proposed for the prevention of intimal hyperplasia in coronary and peripheral arteries in multicenter clinical trials, information is lacking on how irradiation affects arterial histology after stenting and especially how it affects the edges of the stent. We investigated intimal hyperplasia recasting with histological changes in arterial wall at the edges of the stent after arterial stenting followed by adequate external radiation for the prevention of intimal hyperplasia in pigs. MATERIALS AND METHODS: The aorta was experimentally stented in 30 pigs who were then assigned to two groups: irradiation with 20 Gy and a control group with no irradiation. The aorta was resected for morphometric and histological studies 6 weeks after procedure. RESULTS: Intimal thickness was reduced and the intima/media ratio was significantly lower in irradiated groups than in control pigs. In the irradiated group histological examination at the edges of the stent showed thin neointimal proliferation with an intact endothelium. In all sections analyzed in the 20-Gy irradiated group the vascular media at 45 days contained necrotic areas and fibrosis with calcifications. CONCLUSIONS: After arterial injury, adequate ionizing radiation effectively reduces neointimal thickening. Irradiation-induced histological changes include previously undetected recasting with necrosis and fibrosis at the arterial edges of the stent. The parietal recasting we observed in animal arteries irradiated at high doses is unclear and a cause of concern especially after clinical spontaneous dissection was recently reported. The use of ionizing radiation for the prevention of arterial restenosis awaits confirmation with a long-term follow-up including specific experimental histological analyses.
Subject(s)
Arteries/pathology , Arteries/radiation effects , Stents/adverse effects , Animals , Female , Hyperplasia/prevention & control , Hyperplasia/radiotherapy , Immunohistochemistry , Radiation, Ionizing , Statistics, Nonparametric , Sus scrofaABSTRACT
<p><b>OBJECTIVE</b>To investigate the indication of non-operative management of adult blunt splenic injuries.</p><p><b>METHODS</b>A retrospective review was performed on all adult patients (age>15 years) with blunt splenic injuries admitted to the department of vascular surgery of Pellegrin hospital in France from 1999 to 2003. We managed splenic injuries non-operatively in all appropriate patients without regard to age.</p><p><b>RESULTS</b>During the 4 years, 54 consecutive adult patients with blunt splenic injuries were treated in the hospital. A total of 27 patients with stable hemodynamic status were treated non-operatively at first, of which 2 patients were failed to non-operative treatment. The successful percentage of non-operative management was 92.6%. In the 54 patients, 7 of 8 patients older than 55 years were treated with non-operative management. Two cases developing postoperatively subphrenic infection were healed by proper treatment. In the series, there was no death.</p><p><b>CONCLUSIONS</b>Non-operative management of low-grade splenic injuries can be accomplished with an acceptable low-failure rate. If the clinical and laboratory parameters difficult for surgeons to make decisions, they can depend on Resciniti's CT (computed tomography) scoring system to select a subset of adults with splenic trauma who are excellent candidates for a trial of non-operative management. The patients older than 55 years are not absolutely inhibited to receive non-operative management.</p>
Subject(s)
Adolescent , Adult , Aged , Female , Humans , Male , Middle Aged , Hematocrit , Multiple Trauma , Therapeutics , Retrospective Studies , Spleen , Wounds and Injuries , General Surgery , Wounds, Nonpenetrating , General Surgery , TherapeuticsABSTRACT
This retrospective study aims to clarify the mechanisms, frequency, symptoms, treatment, and outcome of post-traumatic thoracic outlet syndromes. A total of 13 patients (7 men and 6 women) with a mean age of 41 +/- 16 years were studied. Underlying injuries resulted from sports, road, and household accidents. Bone lesions were pseudarthrosis, hypertrophic callus, and luxations. Congenital anomalies were observed in five patients (38%). Vascular lesions included aneurysm of the subclavian artery or vein, acute ischemia, and subclavian vein thrombosis. Operative treatment involving orthopedic and/or vascular surgery was indicated in all patients. Post-traumatic thoracic outlet syndrome occurs in young subjects after violent trauma. Vascular complications are frequent and severe. Treatment achieves good results but benefits may be diminished by bone or nerve involvement.
