Ioannis Dermitzakis

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In a small percentage of cases with an occluded common carotid artery (CCA), the patency of the arteries beyond the carotid bulb is preserved. Color duplex sonography is useful for assessing blood flow in these vessels. We present a case of retrograde flow in an internal carotid artery (ICA) with an occluded ipsilateral CCA identified using color duplex(More)
Sonography is not the method of choice for the evaluation of suspected peptic ulcer perforation (PUP). However, indirect sonographic signs and direct visualization of PUP have been reported by several authors in recent years. We report a case of an elderly woman who presented with severe abdominal pain and positive rebound sign, in whom abdominal sonography(More)
AIM Oxidized low-density lipoprotein (oxLDL) is a pivotal factor of the atheromatous process. Statins reduce atheromatosis and cardiovascular risk. The aim of the present study was to investigate the effect of statin therapy on circulating oxLDL and the possible impact of such effect on stenosis due to carotid artery atheromatosis. METHODS A total of 100(More)
The frequency-dependent pi criterion of Bittanti et al. [7] is a very important tool that has been used extensively in applications, to predict potential performance improvement under periodic forcing in a nonlinear system. The pi criterion is local in nature and provides an approximate formula for the performance index under small-amplitude periodic(More)
The present work develops a method to determine higher-order corrections to the pi criterion, derived from basic results of Center Manifold theory. The proposed method is based on solving the Center Manifold PDE via power series. The advantage of the proposed approach is the improvement of the accuracy of the pi criterion in predicting performance under(More)
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