Objective To develop a method for speciation analysis of selenium in plant samples by H2O2-HNO3 microwave-assisted digestion-HGAFS. Methods Plant samples were prepared using H2O2-HNO3 by microwave-assisted digestion. The contents of soluble inorganic Se(IV)and Se(VI)in the samples were determined by HGAFS after separation most of the soluble organic compounds by XAD-2 resin column in HNO3 medium at pH=3. The contents of soluble Se,insoluble Se,inorganic Se (IV)and Se (VI)and organic Se could be calculated. Results The linear range and detection limit of Se(IV)were 0-80 ?g/L and 0.05 ?g/L respectively. The RSD for the total Se detection was 1.7%(n=5?雪. The total Se content in the reference standard substance obtained by this method agreed well with the reference value. Conclusion The method for preparation of plant samples using microwave-assisted digestion could avoid the loss of Se through volatilization. The pretreatment using XAD-2 resin could remove the interference of organic compounds on detecting results of Se(Ⅳ)in the plant samples,which could widen the application of the method in the speciation analysis. The analytical scheme of the method could determine the contents of total,soluble,insoluble,soluble inorganic Se(IV?雪?Se(VI?雪,and organic Se in plant samples. The method was simple and practical.

OBJECTIVE: To evaluate the telephone follow-up of surgery patients with lung cancer and to analyze the prognosis factors. METHODS: From October 2011 to January 2012, 1635 post-surgery lung cancer patients from January 2002 to August 2011 were followed up by telephone interview. The data from follow-up and clinical characteristics were collected and analyzed. Among these patients, 116 patients with complete and reliable clinical data were further analyzed to determine the effective factors of lung cancer metastasis and long-term survival. RESULTS: The average response rate in the follow-up was 36.1%, and the response rate was related to the interval time after the operations. The shorter the interval, the higher the response rate. The response rate in female patients was higher than that in male patients (P<0.001).The response rate was higher in patients younger than 40 (56 %) than that in the patients aged between 50-59 and over 60 (39% and 24% respectively, P<0.001). There was no statistical difference between patients from urban and rural areas (P=0.844). In the 116 patients with complete and reliable clinical data, statistical analysis confirmed that the metastasis and high lymph node staging were factors to increase patients' risk of death (with odd ratio 0.212 and 1.818 respectively, P<0.001). The adenocarcinoma grade, high lymph node staging and advanced age were related to the metastasis risk (odds ratio 2.353, 2.181 and 2.908, respectively). CONCLUSION Time, gender and age are the influencing factors in the telephone follow-up. Metastasis, lymph node metastasis, pathologic type and age are related to the lung cancer prognosis in the small-scale sample.
Adenocarcinoma ; surgery ; Adolescent ; Adult ; Aged ; Aged, 80 and over ; Carcinoma, Squamous Cell ; surgery ; Female ; Follow-Up Studies ; Humans ; Lung Neoplasms ; surgery ; Male ; Middle Aged ; Postoperative Period ; Prognosis ; Quality of Life ; Retrospective Studies ; Telephone ; Young Adult

OBJECTIVES: Thoracoabdominal aortic aneurysm (TAAA) prosthetic vessel replacement is one of the most complex operations in the field of cardiovascular surgery. The key to success of this operation is to prevent and avoid ischemia of important organs while repairing TAAA. This study aims to summarize and analyze the effect of prosthetic vessel replacement under left heart bypass in the treatment of TAAA. METHODS: Data of 15 patients with TAAA who underwent prosthetic vessel replacement under left heart bypass in Xiangya Hospital of Central South University were retrospectively analyzed. According to Crawford classification, there were 2 cases of type I, 8 cases of type II, 3 cases of type III, and 2 cases of type V. There were 14 cases of selective operation and 1 case of emergency operation. All operations were performed under left heart bypass, and cerebrospinal fluid drainage was performed before operation. Left heart bypass was established by intubation of left inferior pulmonary vein and distal abdominal aorta or left femoral artery. The thoracoabdominal aorta was replaced segment by segment. After aortic dissection, the kidneys were perfused with cold crystalloid renal protective solution, and the celiac trunk and superior mesenteric artery were perfused with warm blood. RESULTS: One patient with TAAA after aortic dissection of type A died. During the operation, straight blood vessels were used to repair TAAA, and the celiac artery branches were trimmed into island shape and anastomosed with prosthetic vessels. After the operation, massive bleeding occurred at the anastomotic stoma, then anaphylactic reaction occurred during massive blood transfusion, resulting in death. One patient suffered from paraplegia due to ischemic injury of spinal cord. The other patients recovered well and were discharged. The postoperative ventilation time was (16.5±13.8) h and the postoperative hospital stay was (10±4) d. The amount of red blood cell transfusion was (13±9) U. The patients were followed up for 2 months to 2 years, and the recovery was satisfactory. CONCLUSIONS The effect of prosthetic vessel replacement under left heart bypass in the treatment of TAAA is good, which is worthy of clinical promotion.
Aneurysm, Dissecting/surgery* ; Aortic Aneurysm, Thoracic/surgery* ; Blood Vessel Prosthesis Implantation ; Heart Bypass, Left ; Humans ; Postoperative Complications ; Retrospective Studies ; Treatment Outcome