白蛋白联合小剂量呋塞米对大面积烧伤手术患者肺功能和全身麻醉苏醒时间的影响

目的探讨白蛋白联合小剂量呋塞米对大面积烧伤手术患者肺功能和全身麻醉苏醒时间的影响。方法选取2015年3月-2018年4月石家庄市第一医院全身麻醉下行大面积烧伤切痂植皮手术患者40例作为研究对象。患者分为观察组和对照组,每组20例。年龄21~67岁。ASAⅡ、Ⅲ级,术前血浆白蛋白>27~35 g/L。观察组手术开始时即持续泵入白蛋白10 g/h,同时给予小剂量呋塞米5 mg,液体治疗采用限制性输液方法,晶体液以300~400 ml/h持续输入,不使用胶体,必要时根据失血量输入红细胞、血浆等。对照组采用常规输液方法,麻醉诱导前即以500 ml晶体液开始扩容,术中根据中心静脉压、血压和失血量补充晶体、胶体及血液。比较两组患者氧合指数、乳酸、潮气量、气道峰值压力、平均气道压、动态肺顺应性、输液总量和全身麻醉苏醒时间。结果对照组氧合指数和肺顺应性在手术结束时低于手术开始前,气道峰压和平均气道压高于手术开始前(P<0.05),而观察组这些指标无变化(P>0.05);观察组氧合指数和肺顺应性高于对照组,气道峰压低于对照组(P<0.05),观察组输液总量少于对照组(P<0.05),全身麻醉苏醒时间观察组短于对照组(P<0.05)。结论白蛋白与小剂量呋塞米联合使用,可以改善大面积烧伤手术患者肺氧合功能,降低气道峰压和平均气道压,提高肺顺应性,有利于患者快速苏醒。

Time evolution of angular momentum coherent state derived by virtue of entangled state representation and a new binomial theorem

We study how can an angular momentum coherent state |τ> keeps its form-invariant during time evolution governed by the Hamiltonian H = f(t)J++ f^*(t)J-+ g(t)Jz. We discuss this topic in the context of boson realization of |τ>. By employing the entangled state representation |ζ> and deriving a new binomial theorem involving two-subscript Hermite polynomials, we derive the wave function <ζ|τ>, which turns out to be a single-subscript Hermite polynomial. Based on this result the maintenance of angular momentum coherent state during time evolution is examined, and the value of τ(t) is totally determined by the parameters involved in the Hamiltonian.

Wigner function for squeezed negative binomial state and evolution of density operator for amplitude decay

Using the thermal-entangled state representation and the operator-ordering method, we investigate Wigner function(WF) for the squeezed negative binomial state(SNBS) and the analytical evolution law of density operator in the amplitude decay channel.The results show that the analytical WF is related to the square of the module of single-variable Hermite polynomials, which leads to a new two-variable special function and its generating function, and the parameters s and γplay opposite roles in the WF distributions.Besides, after undergoing this channel, the initial pure SNBS evolves into a new mixed state related to two operator Hermite polynomials within normal ordering, and fully loses its nonclassicality and decays to vacuum at long decay time.

Recast combination functions of coordinate and momentum operators into their ordered product forms

By using the parameter differential method of operators,we recast the combination function of coordinate and momentum operators into its normal and anti-normal orderings,which is more ecumenical,simpler,and neater than the existing ways.These products are very useful in obtaining some new differential relations and useful mathematical integral formulas.Further,we derive the normally ordered form of the operator(fQ+gP)^-n with n being an arbitrary positive integer by using the parameter tracing method of operators together with the intermediate coordinate-momentum representation.In addition,general mutual transformation rules of the normal and anti-normal orderings,which have good universality,are derived and hence the anti-normal ordering of(fQ+gP)^-n is also obtained.Finally,the application of some new identities is given.

Evolution of a two-mode squeezed vacuum for amplitude decay via continuous-variable entangled state approach

Extending the recent work completed by Fan et al. [Front. Phys. 9（1）, 74 （2014）] to a two-mode case, we investigate how a two-mode squeezed vacuum evolves when it undergoes a two-mode amplitude dissipative channel, with the same decay rate ~, using the continuous-variable entangled state approach. Our analytical results show that the initial pure-squeezed vacuum state evolves into a definite mixed state with entanglement and squeezing, decaying over time as a result of amplitude decay. We also investigate the time evolutions of the photon number distribution, the Wigner function, and the optical tomogram in this channel. Our results indicate that the evolved photon number distribution is related to Jacobi polynomials, the Wigner function has a standard Gaussian distribution （corresponding to the vacuum） at long periods, losing its nonclassicality due to amplitude decay, and a larger squeezing leads to a longer decay time.

Multiple-Photon-Added and-Subtracted Two-Mode Binomial States: Nonclassicality and Entanglement

We theoretically analyze the nonclassicality and entanglement of two new non-Gaussian entangled states generated by applying multiple-photon addition and subtraction to a two-mode binomial state.The nonclassical properties are investigated in terms of the partial negativity of the Wigner functions,whose results show that their nonclassicality can be enhanced via one-mode even-number photon operations and two-mode symmetrical operations for the initial two-mode binomial state.We also find that there exists some enhancement in the entanglement properties in certain parameter ranges via one-mode photon-addition and two-mode symmetrical operations.

Multi-variable special polynomials using an operator ordering method

Using an operator ordering method for some commutative superposition operators,we introduce two new multi-variable special polynomials and their generating functions,and present some new operator identities and integral formulas involving the two special polynomials.Instead of calculating compli-cated partial differential,we use the special polynomials and their generating functions to concsely address the normalzation,photoount distributions and Wigner distributions of several quantum states that can be realized physically,the rsults of which provide real convenience for further investigating the properties and applications of these states.