9,564 research outputs found
Information on the structure of the a1 from tau decay
The decay is analysed using different methods to
account for the resonance structure, which is usually ascribed to the a1. One
scenario is based on the recently developed techniques to generate axial-vector
resonances dynamically, whereas in a second calculation the a1 is introduced as
an explicit resonance. We investigate the influence of different assumptions on
the result. In the molecule scenario the spectral function is described
surprisingly well by adjusting only one free parameter. This result can be
systematically improved by adding higher order corrections to the iterated
Weinberg-Tomozawa interaction. Treating the a1 as an explicit resonance on the
other hand leads to peculiar properties
Significance of New, Isolated T-wave Inversion in Multiple Electrocardiogram Leads with Regadenoson Injection in Patients with Normal Myocardial Perfusion Imaging: An Observational Report of 5 Consecutive Cases
Introduction
The pharmacologic (regadenoson) stress myocardial perfusion imaging (MPI) is used widely in patients who cannot exercise for detecting coronary artery disease (CAD). The interpretation of these studies depends primarily on the imaging results because the sensitivity of electrocardiograms (ECG) in this setting is poor. Prior study showed that effects of regadenoson on ST-segment occurred infrequently and had low sensitivity for detecting CAD. The significance of T-wave inversion in multiple ECG leads without ST-segment depression with regadenoson injection in patients with normal MPI is described and reported.
Methods
ECGs were reviewed retrospectively in 64 patients who had regadenoson MPI and coronary angiography for evaluation of CAD from June 1, 2016 to August 31, 2018. Five cases were identified with new, isolated T-wave inversion in multiple ECG leads.
Results
All five cases had new and isolated T-wave inversion in multiple leads without ST segment depression with regadenoson injection and normal MPI. At coronary angiography, three of the five cases showed obstructive coronary artery disease who received coronary percutaneous intervention. One case had nonobstructive coronary artery disease and one had a normal coronary artery.
Conclusions
Despite nonspecific ST-T changes on baseline ECGs and normal MPI in all patients, three of five cases had obstructive CAD by coronary angiography. New, isolated T-wave inversion in multiple ECG leads with regadenoson injection were observed in our patients with normal MPI. These ECG findings may be associated with false negative MPI. Therefore, careful observation and scrutiny of all ECG changes, especially new, isolated T-wave inversion in multiple ECG leads during regadenoson MPI is advisable to identify potential obstructive CAD despite normal MPI findings
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