Combined optical line-of-sight and crosslink radiometric navigation for distributed deep-space systems.

This manuscript aims to present and evaluate the applicability of combining optical line-of-sight (LoS) navigation with crosslink radiometric navigation for deep-space cruising distributed space systems. To do so, a set of four distributed space systems architectures is presented, and for each of those, the applicability of the combination is evaluated, comparing it to the baseline solutions, which are based on only optical navigation. The comparison is done by studying the performance in a circular heliocentric orbit in seven different time intervals (ranging from 2024 to 2032) and exploiting the observation of all the pairs of planets from Mercury to Saturn.

Design and testing of star tracker algorithms for autonomous optical line-of-sight deep-space navigation.

This paper aims to investigate the capabilities of exploiting optical line-of-sight navigation using star trackers. First, a synthetic image simulator is developed to generate realistic images, which is later exploited to test the star tracker's performance. Then, generic considerations regarding attitude estimation are drawn, highlighting how the camera's characteristics influence the accuracy of the estimation.

[Percutaneous transcatheter closure of an aorta to left atrium fistula with an Amplatzer septal occluder in a patient with a mitral bioprosthesis].

We describe the case of a patient with a mitral bioprosthetic valve undergoing percutaneous closure with fluoroscopy and echocardiographic guidance of a rare left sinus of Valsalva‒left atrial fistula. The original aspect of this case is that the fistula was located at the level of the left sinus of Valsalva next to the mitral valve bioprosthesis with subsequent risk of prosthesis damage and/or occlusion of the left coronary artery at its origin during the procedure.

Long-term outcome after drug-eluting stents implantation: target lesion versus nontarget lesion repeated intervention.

We sought to investigate the relative clinical significance of target and nontarget lesions repeated percutaneous coronary intervention (re-PCI) in patients implanted with drug-eluting stents (DES). Out of 2626 consecutive DES patients, we retrospectively selected 166 (6.3%; 123 males, aged 65±10 years) who had a clinically-driven re-PCI over a mean follow-up of 15 months.

Beneficial effect of post-procedural abciximab in patients undergoing primary coronary angioplasty and presenting with the no-reflow phenomenon.

We sought to investigate the effect of post-procedural abciximab on clinical outcome of patients presenting the no-reflow phenomenon after primary angioplasty. We retrospectively selected 38 patients who developed the no-reflow phenomenon after primary angioplasty: 18 received post-procedural abciximab, 20 age- and sex-matched patients who did not receive abciximab were considered as concurrent controls. At 6 months follow-up, the clinical course was uneventful in the abciximab group while the composite end-point of major adverse cardiac events occurred in 8 patients (40%) in the control group (P=0.

Symptomatic failure after sirolimus-eluting stent implantation: a rare but challenging condition.

Background: Limited information is available regarding restenosis after implantation of a sirolimus-eluting stent (SES).

Objective: To report on angiographic characteristics, clinical presentation and treatment of this particularly complex type of coronary lesion.

Methods And Results: A total of 1424 SES were implanted in 1159 patients (average 1.

Outcome of percutaneous hybrid coronary revascularization: bare metal stents jeopardize the benefit of sirolimus-eluting stents in the real world.

Background: In an effort to contain procedural costs while limiting the risk of in-stent restenosis, hybrid percutaneous revascularization (ie, stenting with at least one sirolimus-eluting stent [SES] and at least one bare metal stent [BMS] in the same patient) is felt to be a cost-effective alternative to exclusive SES use.

Objective: To describe the outcome of hybrid percutaneous revascularization for the treatment of patients with multiple coronary artery lesions.

Methods And Results: Fifty-six patients (42 men; mean age [+/- SEM] 64+/-2) underwent hybrid stenting (average of 1.