简介：AbstractImportance:A nasogastric tube is used commonly to decompress the stomach and provide enteral feeding in surgical and medical practice. Sometimes this safe and innocent-looking tube may lead to unexpected complications. We focus here on the possibility of spontaneous 'lariat loop’ knotting of the nasogastric tube when some resistance is felt on tube retrieval and describe a method of safe tube removal.Case presentation:We present a case of self-knotting of a nasogastric tube that was placed to decompress the stomach during the postoperative period after surgical repair of anorectal malformation in a 4-month-old boy.Conclusion:Self-knotting of the distal end of nasogastric tube is an unusual complication with catastrophic sequelae if not addressed properly. If any resistance is felt during nasogastric tube retrieval, self-knotting of the tube must be suspected.

简介：AIMTo评估剩余的excimer激光修正的功效和安全在有intraocular的奔流抽取以后的折射错误透镜(IOL)培植在不平常cases.METHODSTotally有高剩余的24个病人在有IOL培植的奔流外科以后的折射错误被检验。22个病人有phacoemulsification和IOL培植的历史，并且二与IOL培植有囊外的奔流抽取。外科手术前的医药记录的详细检查被做解释奔流以后的折射错误的起源。所有病人经历了photorefractirekeratectomy(PRK)改进。吝啬的结果措施是折射，uncorretted视觉尖酸(UCVA)，最好改正的视觉尖酸(BCVA)和角膜的透明性并且列在后面在上面从1到剩余变常眼的8y.RESULTSThe主管原因是在有高近视和先天的透镜畸形的反常眼睛的不精确的IOL计算，两个都由角膜的散光列在后面导致的缝术并且先存在。在奔流外科以后并且在激光改进前，吝啬的球形的等价物(SE)是-0.56?潢吗？

简介：Helicitywasappliedtoanalyzeseveralhigh-windandrainstormprocesses,whichoccurredfromMaytoJune,2001overYunnaninearlysummer.Theresultsofdiagnosticanalysesshowthattherainstormoccursintheareainwhichhpispositiveat700hPaandenergyisunstable.Thechangeofhelicitycanreflectthemovementanddevelopmentofsynopticsystemandthepositionandintensityoftherainstorm.Thevalueofhpisanegativecenterattheupperlevelandapositiveatthelowerlevelovertherainstormposition;moreoveritcanreflectthecharacteristicsofverticaldistributionandrotationalmotion.

简介：AbstractBackground:As one of the non-pharmacological interventions to control the transmission of COVID-19, determining the quarantine duration is mainly based on the accurate estimates of the incubation period. However, patients with coarse information of the exposure date, as well as infections other than the symptomatic, were not taken into account in previously published studies. Thus, by using the statistical method dealing with the interval-censored data, we assessed the quarantine duration for both common and uncommon infections. The latter type includes the presymptomatic, the asymptomatic and the recurrent test positive patients.Methods:As of 10 December 2020, information on cases have been collected from the English and Chinese databases, including Pubmed, Google scholar, CNKI (China National Knowledge Infrastructure) and Wanfang. Official websites and medias were also searched as data sources. All data were transformed into doubly interval-censored and the accelerated failure time model was applied. By estimating the incubation period and the time-to-event distribution of worldwide COVID-19 patients, we obtain the large percentiles for determining and suggesting the quarantine policies. For symptomatic and presymptomatic COVID-19 patients, the incubation time is the duration from exposure to symptom onset. For the asymptomatic, we substitute the date of first positive result of nucleic acid testing for that of symptom onset. Furthermore, the time from hospital discharge or getting negative test result to the positive recurrence has been calculated for recurrent positive patients.Results:A total of 1920 laboratory confirmed COVID-19 cases were included. Among all uncommon infections, 34.1% (n = 55) of them developed symptoms or were identified beyond fourteen days. Based on all collected cases, the 95th and 99th percentiles were estimated to be 16.2 days (95% CI 15.5-17.0) and 22.9 days (21.7-24.3) respectively. Besides, we got similar estimates based on merely symptomatic and presymptomatic infections as 15.1 days (14.4-15.7) and 21.1 days (20.0-22.2).Conclusions:There are a certain number of infected people who require longer quarantine duration. Our findings well support the current practice of the extended active monitoring. To further prevent possible transmissions induced and facilitated by such infectious outliers after the 14-days quarantine, properly prolonging the quarantine duration could be prudent for high-risk scenarios and in regions with insufficient test resources.

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