Radio Channel Capacity with Directivity Control of Antenna Beams in Multipath Propagation Environment.

The basic technology that will determine the expansion of the technical capabilities of fifth generation cellular systems is a massive multiple-input-multiple-output. Therefore, assessing the influence of the antenna beam orientations on the radio channel capacity is very significant. In this case, the effects of mismatching the antenna beam directions are crucial.

Fiber Optic Based Distributed Mechanical Vibration Sensing.

The distributed long-range sensing system, using the standard telecommunication single-mode optical fiber for the distributed sensing of mechanical vibrations, is described. Various events generating vibrations, such as a walking or running person, moving car, train, and many other vibration sources, can be detected, localized, and classified. The sensor is based on phase-sensitive optical time-domain reflectometry (ϕ-OTDR).

Myocardial injury in patients after an elective abdominal aortic aneurysm repair.

Background: The aim of the study was to study the frequency of cTnI release in patients undergoing an elective abdominal aortic aneurysm repair (AAA) and examine the relationship between an early perioperative myocardial injury, as detected by an increased serum levels of cTnI, and a clinical outcome (postoperative cardiac and non-cardiac complications, mortality).

Methods: A prospective observational study of 90 patients undergoing an elective AAA repair.

Setting: University hospital.

Perioperative haemodynamic monitoring by oesophageal Doppler improves outcome of patients with abdominal aortic aneurysm repair.

Background: AAA repair is associated with high rate of mortality and morbidity. Oesophageal Doppler (OED) can offer a less invasive cost-effective tool for intraoperative monitoring of haemodynamic changes. The aim of the study was to confirm the benefits of haemodynamic optimisation in patients undergoing AAA repair using OED monitoring.

Is carotid endarterectomy under the cervical plexus block safe for all patients with various degree of cardiovascular risk?

Background: The result of the GALA study did not answer the question whether it is safe to perform carotid endarterectomy (CEA) under the cervical plexus block (CPB) in patients at high cardiovascular (CV) risk. The aim of the study was to compare CV stability and the frequency of cardiovascular and neurological complications in 3 groups of patients with various degree of CV risk who underwent CEA under CPB.

Methods: 60 patients operated on in CPB were divided into the 3 groups according to the degree of their CV risk (I: very high, II: medium, III: low).