172 research outputs found
The role of "cutting" balloon angioplasty for the treatment of short femoral bifurcation steno-obstructive disease
No full text
Cutting balloon versus conventional balloon angioplasty in short femoropopliteal arterial stenoses
No full textPurpose: To compare midterm results of cutting balloon angioplasty (CBA) to conventional percutaneous transluminal angioplasty (PTA) for the treatment of short femoropopliteal arterial stenosis.
Methods: Between February 2004 and June 2006, 84 consecutive patients (49 men; mean age 68.5 years, range 53–89) with a total of 142 focal (,3 cm), calcified femoropopliteal occlusive lesions underwent endovascular treatment via an antegrade approach: 40 patients (67 lesions) were treated with PTA and 44 patients (75 lesions) underwent CBA. Follow-up consisted of clinical examination and color duplex ultrasonography at intervals to 2 years.
Results: All treatments were technically successfully, without any major complication. In 4 (6%) of 67 lesions treated with PTA, a self-expanding stent was implanted due to a flow- limiting dissection; no patient treated with CBA had recoil, dissection, or arterial tears requiring stent placement. In the PTA group, primary and secondary patency rates, respectively, were 91.0% and 95.5% at 6 months, 83.1% and 92.4% at 12 months, and 66.6% and 76.5% at 2 years. In the CBA patients, the primary and secondary patency rates, respectively, were 93.2% and 95.9% at 6 months, 90.4% (p,0.001 versus PTA at same interval) and 94.5% at 12 months, and 79.7% (p,0.001) and 85.6% (p,0.001) at 2 years. Conclusion: CBA seems to be a valuable tool in the endovascular treatment of short femoropopliteal stenotic lesions, achieving better patency at midterm compared to conventional PTA
Assessing Direct Monitoring Techniques to Analyze Failures of Critical Industrial Systems
No full textThe analysis of monitoring data is extremely valuable for critical computer systems. It allows to gain insights into the failure behavior of a given system under real workload conditions, which is crucial to assure service continuity and downtime reduction.
This paper proposes an experimental evaluation of different direct monitoring techniques, namely event logs, assertions, and source code instrumentation, that are widely used in the context of critical industrial systems. We inject 12,733 software faults in a real-world air traffic control (ATC) middleware system with the aim of analyzing the ability of mentioned techniques to produce information in case of failures. Experimental results indicate that each technique is able to cover a limited number of failure manifestations. Moreover, we observe that the quality of collected data to support failure diagnosis tasks strongly varies across the techniques considered in this study
What Logs Should You Look at When an Application Fails? Insights from an Industrial Case Study
No full textEvent logs are the first place where to find useful
information about application failures. Event logs are available
at different system levels, such as application, middleware
and operating system. In this paper we analyze the failure
reporting capability of event logs collected at different levels of
an industrial system in the Air Traffic Control (ATC) domain.
The study is based on a data set of 3,159 failures induced
in the system by means of software fault injection. Results
indicate that the reporting ability of event logs collected at a
given level is strongly affected by the type of failure observed
at runtime. For example, even if operating system logs catch
almost all application crashes, they are strongly ineffective in
face of silent and erratic failures in the considered system
- …
