Radial Artery Pseudoaneurysms Treated by Ultrasound-Guided Differential Compression: An Effective and Simple Method.

Transradial approach has become preferable to conventional femoral artery access for both diagnostic coronary angiography and percutaneous coronary intervention. A rare but recognizable complication of radial access is radial artery pseudoaneurysm (RAp), which represents a potentially catastrophic complication. Treatment options comprise ultrasound (USG)-guided manual compression or thrombin injection or surgical correction. In this case series, we report four cases of RAps that we encountered at a single tertiary care center from July 2015 to January 2018. We compressed the radial artery using a sphygmomanometer cuff differentially rather than a TR band proximal to the pseudoaneurysm to treat three of them. One of the patients underwent surgical repair of the pseudoaneurysm as the location of the aneurysm was not suitable for compression or thrombin injection. In our series of cases, we conclude that RAp, a rare complication of radial catheterization, was seen more commonly in elderly female patients and can be easily treated by the USG-guided differential compression, a simple and readily available method. Prevention and early diagnosis is the key to avoid serious consequences.

Experimental and theoretical study of mechanoluminescence and lyoluminescence of Li3 PO4 : RE (RE = Dy and Tb) phosphors.

Li3 PO4 phosphors prepared by solid-state diffusion technique and lyoluminescence (LL) as well as mechanoluminescence (ML) studies are reported. Dy- and Tb-activated phosphors show dosimetric characteristics using LL and ML techniques. The energy levels and hence trapping and detrapping of charge carriers in the material can be studied using ML. Li3 PO4 phosphor can be used in the dosimetric applications for ionizing radiation. By using the LL technique, the LL characteristics of Li3 PO4 may be useful for high radiation doses. We also report a more detailed theoretical understanding of the mechanism of LL and ML.

Systematic study of photoluminescence, lyoluminescence and mechanoluminescence in Ce3+ - and Eu3+ -activated Li3 PO4 phosphors.

Li3 PO4 phosphor was prepared using a modified solid-state diffusion technique. In this work, photoluminescence, lyoluminescence and mechanoluminescence studies were carried out in a Li3 PO4 microcrystalline powder doped with different rare earths. In photoluminescence studies, characteristic emission of Ce and Eu was observed. The lyoluminescence glow curves of Li3 PO4 microcrystals show that lyoluminescence intensity initially increases with time and then decreases exponentially. The decay time consists of two components for all masses. The dependence of decay time, especially the longer component, on mass has been investigated. Experiments on γ-irradiated crystals have proved that the light emission originates from the recombination of released F-centres with trapped holes (V2-centres) at the sulfuric acid-solid interface. Incorporation of bivalent alkali in solid lithium phosphate leads to an enhancement of lyoluminescence. A possible explanation for the experimental results has been attempted. The phosphor has a mechanoluminescence single glow peak. Mechanoluminescence intensity under various loading conditions was investigated. It is observed that mechanoluminescence intensity increases with increasing impurity concentration and increasing piston impact velocity. The results may be considered as only being of academic interest in solid-state materials.

Studies on the mass and temperature dependence of lyoluminescence intensity of microcrystalline powder of KCl.

The temperature and mass dependence of lyoluminescence intensity of γ-irradiated colored potassium chloride powder have been studied using a photomultiplier tube connected to an x-y recorder. The peak lyoluminescence intensity increases with increasing amount of solute added up to 50 mg and then tends to saturate. The lyoluminescence (LL) glow curves with mass of KCl microcrystals show that initially the LL intensity increases with time and then decreases exponentially with time. The decay time consists of two components for all the masses. The dependence of decay time, especially the longer component on mass, has been investigated. The temperature dependence of LL intensity shows that initially the peak LL intensity increases with temperature up to 60°C, and then decreases with further increase in temperature. The decay time tends to decrease with increasing temperature. An explanation for the experimental results has been attempted.