[en] Objective: To summarize the experience of nursing care in coordination with endovascular embolization treatment for intracranial aneurysms. Methods: A total of 145 patients with intracranial aneurysms were enrolled in this study. Embolization treatment with detachable coils was performed in all patients. Sufficient preoperative preparations, standard nursing coordination during the procedure, psychological nursing and monitoring of vital signs were strictly carried out. Postoperative complications and their prevention and management were documented. Results: With the help of standard nursing cooperation, the interventional procedure was completed in all patients. During the interventional management vascular spasm occurred in 4 patients, thrombosis in 2 patients and rupture of the aneurysm in 3 patients. After prompt and effective management of the complications, the interventional procedure was successfully accomplished in all patients. Conclusion: The standardized nursing cooperation during surgery, monitoring of vital signs, prevention of complications, prompt and effective treatment of complications are the keys to ensure the success of operation. (authors)

[en] In this paper, a gradient-based iterative algorithm is proposed for finding the least-squares solutions of the following constrained generalized inverse eigenvalue problem: given $X\in <!--\; ???\; -->C^{n\times <!--\; ??\; -->m}$, $\mathrm{\Lambda <!--\; ??\; -->}=\mathrm{d}\mathrm{i}\mathrm{a}\mathrm{g}({\mathrm{\lambda <!--\; ??\; -->}}_1,{\mathrm{\lambda <!--\; ??\; -->}}_2,\dots <!--\; ???\; -->,{\mathrm{\lambda <!--\; ??\; -->}}_m)\in <!--\; ???\; -->C^{m\times <!--\; ??\; -->m}$, find $A^{\ast <!--\; ???\; -->},B^{\ast <!--\; ???\; -->}\in <!--\; ???\; -->C^{n\times <!--\; ??\; -->n}$, such that $\parallel <!--\; ???\; -->AX-<!--\; ???\; -->BX\mathrm{\Lambda <!--\; ??\; -->}\parallel <!--\; ???\; -->$ is minimized, where $A^{\ast <!--\; ???\; -->},B^{\ast <!--\; ???\; -->}$ are Hermitian–Hamiltonian except for a special submatrix. For any initial constrained matrices, a solution pair $(A^{\ast <!--\; ???\; -->},B^{\ast <!--\; ???\; -->})$ can be obtained in finite iteration steps by this iterative algorithm in the absence of roundoff errors. The least-norm solution can be obtained by choosing a special kind of initial matrix pencil. In addition, the unique optimal approximation solution to a given matrix pencil in the solution set of the above problem can also be obtained. A numerical example is given to show the efficiency of the proposed algorithm.

[en] Objective: To compare the therapeutic effect of interventional embolization with that of microsurgical clipping in treating posterior communicating artery aneurysm associated with acute hydrocephalus. Methods: The clinical data of 61 patients with posterior communicating artery aneurysm complicated by acute hydrocephalus, who were admitted to the Neurosurgery Department of Hainan Provincial People's Hospital during the period from October 2005 to September 2013, were retrospectively analyzed. According to the treatment method, the patients were divided into interventional embolization group (n = 25) and microsurgical clipping group (n = 36). After the treatment, the patients were followed up for one year. The incidences of shunt-dependent hydrocephalus as well as the prognoses in the two groups were compared, and the clinical outcomes were evaluated by using the modified Rankin scale (mRS). Score of 0-2 points was regarded as favorable prognosis, and score of 3-6 points as poor prognosis. Results: The incidence of shunt-dependent hydrocephalus in interventional embolization group was 36.0% (9/25), which was remarkably higher than that in microsurgical clipping group (19.5%, 5/36), and the difference between the two groups was statistically significant χ² = 4.079, P < 0.05). The favorable prognosis rate in interventional embolization group was 84.0% (21/25), which was much better than that in microsurgical clipping group (58.3%, 21/36), and the difference between the two groups was statistically significant (χ² = 4.532, P < 0.05). Conclusion: In treating posterior communicating artery aneurysms complicated by acute hydrocephalus, the incidence of shunt-dependent hydrocephalus of interventional embolization therapy is higher than that of microsurgical clipping therapy, but interventional embolization therapy carries better prognosis. Therefore, interventional embolization therapy should be regarded as the preferential treatment method. (authors)

[en] Adsorption of Cu²⁺ and Co²⁺ from aqueous solution using zeolite synthesized from coal gangue was examined at room temperature. Batch experiments were carried out to investigate the effects of contact time, initial ion concentration, and pH on the adsorption process. Under comparable conditions, the adsorption greatly depended on initial ion concentration and pH. Different isotherms were applied to describe equilibrium data, and the results turned out that adsorption data can be better fitted with Langmuir, Temkin, and Dubinin–Radushkevich models, indicating monolayer coverage of adsorption sites on the surface of zeolite NaX and a physical process for Co²⁺ and Cu²⁺ adsorption. Adsorption capacity calculated from Langmuir was 45.05 mg/g for Cu²⁺ and 44.53 mg/g for Co²⁺. The adsorption kinetic could be better described with the pseudo-second-order model, and the removal mechanism of Co²⁺ and Cu²⁺ by the synthesized zeolite NaX was governed by surface adsorption, film diffusion, and intra-particle diffusion. The work suggests that coal gangue-derived zeolite NaX can be used as an alternative economical adsorbent for metal ions removal.