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Type II endoleak is a common complication following endovascular aortic aneurysm repair and can lead to an increased risk of aneurysmal expansion and rupture. The most frequently employed strategies to treat Type II endoleak involves catheterization of the branch vessels responsible for the endoleak or accessing the aneurysm sac through a percutaneous approach. An endovascular transcaval approach for embolization of the aneurysmal sac provides an alternate strategy with comparable success rates. This technique is advantageous when the endoleak is predominantly on the right side of the aneurysm sac and/or when a direct access to the aneurysm sac through a percutaneous approach is not feasible.

Objective: Over the last 2 decades, there has been an exponential rise in placement of retrievable inferior vena cava (IVC) filters, while the retrieval rate has remained steadily low. Approaches to increasing filter retrieval rates have been extensively studied. Conclusion: This review presents an up-to-date review of reported data-driven variables that affect retrieval rates of IVC filters, with a focus on clinical, technical, and process factors.

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Following is a summary of the progress of research and development activities performed during FY 1973 by the Respirator Research and Development Section, Industrial Hygiene Group of the Los Alamos Scientific Laboratory (LASL) under an interagency agreement between the National Institute for Occupational Safety and Health (NIOSH) and the Atomic Energy Commission. The work was done at LASL and was a continuation of the services performed for NIOSH by the AEC under an FY 1972 interagency agreement. As requested in the FY 197 3 interagency agreement, the efforts were concentrated in three major areas: 1) The development of quality control test methods and the correlation of these test methods with the present respirator approval tests in order to provide improved quality control test methods for use by respirator manufacturers and NIOSH. 2) The design, construction, and delivery of respirator test equipment for the performance of quality control tests to the NIOSH Testing and Certification Laboratory at Morgantown, West Virginia, and to the NIOSH Engineering Laboratory at Cincinnati, Ohio, and 3) Develop respirator test methods.

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