Subjects: Geosciences >> Geography submitted time 2020-06-02 Cooperative journals: 《干旱区地理》
Abstract： 利用东北地区207个国家基本气象站1961-2014年气象数据，计算改进后的综合气象干旱指数('VIQZ)、相对湿润度指数(DIZ)、标准化降水指数(SPI)以及标准化权重降水指数(SPIA)这4种常见的干旱指数，对比分析其在该区域的适用性，结果表明:在东北地区，4种气象干旱指数判断历年干旱持续天数及干旱过程强度的演变趋势基本一致;在干旱影响范围方面，SPI和SPIW指数对较长时间的干旱过程判别效果不佳』2乙，指数能够较好的反应各时间尺度干旱过程的影响范围。在空间分布方面，SPI和SPIW指数无明显经向分布特征月TCI和MI指数的空间分布特征基本一致，呈现经向分布特征，干旱过程强度及干旱过程持续天数自西向东递减。从不同时间尺度的干旱影响范围、干旱累计强度和干旱持续天数的空间分布以及指数计算方法角度考虑』TCI指数较为接近实际灾情。
Subjects: Medicine, Pharmacy >> Preclinical Medicine submitted time 2017-12-27 Cooperative journals: 《南方医科大学学报》
Abstract： Objective To evaluate the long-term efficacy of microwave ablation in the treatment of small renal cell carcinoma (RCC). Methods We retrospectively analyzed 140 cases of small cell renal carcinoma (151 lesions with a mean diameter of 2.8�0.8 cm) treated between April, 2006 and October, 2015 with ultrasound-guided microwave ablation with cooled-shaft needle antenna. One microwave ablation antenna was used for tumors less than 2 cm in diameter and 2 antennas were used for larger tumors. The patients received enhanced ultrasound and CT/MRI examinations at 1, 3, and 6 months after the operation and every 6 months thereafter. The overall survival, disease-free survival, and local tumor progression rate of the patients were evaluated. Results The response rate of treatment (complete ablation at one month on enhanced images) was 100% in these patients. The local tumor progression rates at 1, 3, and 5 years were 0.9%, 2.0%, and 7.1%, respectively, and the 1-, 3-, and 5-year distant metastasis rates were 1.6%, 2.5%, and 7.9%, respectively. The overall survival rates of the patients at 1, 3, and 5 years were 98.4% , 94.8% , 89.5% , respectively, with disease-free survival rates of 98.4% , 93.0% , and 83.1% , espectively. No major complications occurred in these cases, and multivariate analysis showed that the tumor number (P=0.015) and tumor growth patterns (P=0.049) were independent risk factors that adversely affected the long-term outcome after surgery. Conclusion Our data show that microwave ablation is a safe and effective modality for treatment of renal cell carcinoma.
Subjects: Medicine, Pharmacy >> Preclinical Medicine submitted time 2017-12-07 Cooperative journals: 《南方医科大学学报》
Abstract： Objective To investigate the feasibility safety and efficacy of ultrasound-guided percutaneous microwave ablation(MWA) of splenic tumors. Methods Seven patients with 8 pathologically confirmed splenic tumors (including 2 metastases from the ovary and 4 from the lung, gastric adenocarcinoma, hepatocellular carcinoma, or rectal carcinoma; 1 hemangioma and 1 inflammatory pseudotumor) with sizes ranging from 1.3 to 6.2 cm (mean 3.111.9 cm) were treated with MWA. A cooled shaft needle antenna was percutaneously inserted into the tumor under ultrasound guidance. A thermocouple was placed about 0.5 cm away from the tumor to monitor the temperature in real time during the ablation. The microwave emitting power was set at 50-60 W. The treatment efficacy was assessed by contrast-enhanced imaging at 1, 3 and 6 months following the procedure, and every 6 months thereafter. Results All the tumors were completely ablated in a single session and no complications occurred. No local tumor progression was observed during a median follow up time of 13 months (4 to 92 months). The ablation zone, well defined on contrast-enhanced imaging, was gradually reduced with time. A new metastatic lesion was detected in the spleen at 11 months after the ablation in a ovarian carcinoma patient and was successfully treated by a second MWA. The post-ablation survival of the patients with splenic metastasis was 13 months (range 4 to 92 months). No complications other than fever and abdominal pain were observed in these patients. Conclusion Ultrasound-guided percutaneous MWA is a safe and effective minimally-invasive technique for treatment of splenic tumors in selected patients.
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