Objective: To study the effects of capsaicin applied locally to infraorbital nerve on primary afferent nerve inadult rats. Methods:Capsaicin solution (2% ) was directly applied onto one lateral intraorbital nerve, and the contralateralnerve was used as self-control. Both experimental and control infraorbita1 nerves were observed under electron tnicroscope on3, 7, 14, 21, 28, 35 or 42 d after local administration. Substance P(SP)--like immunoreactive positive granules in both lateralnucleus caudalis spinalis nervi trigemini (CNV) were examined by immunohistochemical method. Results: Degenerated un-myelinated fibers in capsaicin-treated nerves were found under electron microscope, and no myelinated fibers changes werefound. The gray scale value of SP-like immunoreactive positive granules in the experimental side was markedly lower thanthat in the control side (P＜0. 01), while no significant difference was observed between different time groups. Conclusion:Local administration of capsaicin can produce selective destruction of unmyelinated fibers in primary afferent nerves, and canreduce the levels of SP in regions of CNV. The results suggest that local administration of capsaicin has potential therapeuticvalue for trigeminal neuralgia.

Objective To discuss the diagnosis and management and prevention of spontaneous renal allograft rupture. Methods A retrospective analysis of 12 spontaneous renal allograft rupture was conducted. Clinical presentations were similar in all patients: sudden pain and swelling over the graft and declining blood pressure accompanied by anufia. Color-ultrasound combined with clinical manifestation had higher sensitive in detecting a case. Eleven cases were performed emergency operation, 3 of them lost their kidneys, 8 of them were performed transplant-preserving operation,2 cases lost their allograft because of rerupture of the kidney. Conservative therapy was carried on 1 case. Results Five cases of transplant nephrectomy were given hemodialysis to maintain, 6 eases who had accepted surgery to retain kidney transplantation and 1 case of using conservative treatment were cured and discharged. Conclusions Acute rejection and acute tubular necrosis are the main causes of spontaneous renal allograft rupture. Color-ultrasound combined with clinical manifestation have higher sensitive in detecting a case. As soon as possibly adopting internal medicine, surgery for a joint deal with the breakdown of renal aUograft rupture is important.Prevention should begin with the removal of the kidney, operation of the renal graft, rational use of immunodepressants, and early management of transplant rejection.