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Search Results: 1 - 10 of 14063 matches for " Andrea Zardi "
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Effort angina in a patient with advanced coronary artery disease. Role played by coronary angiography, Ivus and cardiac CT: case report
Domenico M Zardi, Enrico M Zardi, Andrea Berni, Cristiana Nannini, Biagio Pace, Stefano Santucci, Massimo Volpe
Cardiovascular Ultrasound , 2008, DOI: 10.1186/1476-7120-6-48
Abstract: In this report, we describe the case of a 62-year-old man whose effort angina was first evaluated with coronary angiography, but whose severe stenosis of the right coronary artery was only observed on cardiac CT and IVUS. This additional diagnosis promptly resulted in a therapeutic approach with percutaneous transluminal coronary angioplasty (PTCA).Advanced coronary artery disease (CAD) may be caused by multiple stenotic lesions in which plaque remodelling and thrombus play an important role. Since the 60's, coronary angiography has been proven to be the gold standard invasive method for assessing CAD and providing information about the silhouette of the coronary artery lumen; however, much of the information about the coronary artery wall and plaque composition cannot be captured using this technique [1,2]. Recently, new cardiac imaging techniques such as intravascular ultrasound (IVUS), which can be used to depict coronary arteries and assess atherosclerotic plaques, and cardiac computed tomography (CT), which can be used to estimate the degree of coronary artery calcification, have become available. IVUS, because of its ability to better characterize atherosclerotic plaques, promises to become a powerful complementary tool to coronary angiography. In addition, cardiac CT, which can be used to reveal stenotic coronary vessels and study bypass grafts, may be used as a non-invasive method [2].We report a case of a 62-year-old man in which the diagnosis of a critical stenotic lesion was reached only after performing the three imaging techniques mentioned above (coronary angiography, cardiac CT and IVUS).The clinical history of the patient, a male smoker who was both hypertensive and hyperlipidemic, began in 2004 when he underwent coronary angiography for unstable angina; this technique established the presence of severe stenosis (80%) of the middle left anterior descending coronary artery (LAD) which was treated with direct stenting with bare metal stent [BMS (Guidan
Can a course modify the quality of triage in ER?
Nicola Parenti,Andrea Zardi,Roberta Manfredi,Diego Sangiorgi
Emergency Care Journal , 2009, DOI: 10.4081/ecj.2009.3.16
Abstract: All international Societies of Emergency Medicine have developed and promote courses on triage methods and guidelines, given their fundamental role in improving initial evaluation of patients in Emergency Department settings. However, as far as we know, few studies analyse the effect of triage courses on the allocation of priority codes. Since 2001, the Intra-Hospital Triage Guidelines have been implemented in Imola, where they are disseminated and illustrated in two-day courses. In this study, we analysed the effect of a two-day triage course on the quality of priority code allocation to patients evaluated at our ER. The Triage Guidelines course appears to improve two of the quality indicators analysed: observance of documentation standards and compliance with Triage Guidelines.
Increased Carotid Thickness in Subjects with Recently-Diagnosed Diabetes from Rural Cameroon
Nicola Napoli, Enrico Zardi, Rocky Strollo, Michele Arigliani, Andrea Daverio, Flaminia Olearo, Daniele Tosi, Giordano Dicuonzo, Filomena Scarpa, Claudio Pedone, Hervé Hilaire Tegue Simo, Giovanni Mottini, Paolo Pozzilli
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0041316
Abstract: Background We have recently shown a high prevalence of diabetes and obesity in rural Cameroon, despite an improved lifestyle. Diabetes in rural Africa remains underdiagnosed and its role in increasing risk of atherosclerosis in these populations is unknown. We investigated the prevalence of carotid atherosclerosis and cardiovascular risk factors in a population of subjects with recently-diagnosed diabetes from rural Cameroon. Methodology/Principal Findings In a case-control study, carotid intima-media thickness (IMT) was measured in 74 subjects with diabetes (diagnosed <2 years), aged 47–85 and 109 controls comparable for age and sex. Subjects were recruited during a health campaign conducted in April 2009. Blood glucose control (HbA1c, fasting blood glucose) and major cardiovascular risk factors (complete lipid panel, blood pressure) were also measured. Mean carotid IMT was higher in subjects with diabetes than healthy controls at each scanned segment (common, internal carotid and bulb) (P<0.05), except the near wall of the left bulb. Vascular stiffness tended to be higher and pressure-strain elastic modulus of the left carotid was increased in subjects with diabetes than controls (P<0.05), but distensibility was similar between the two groups. At least one plaque >0.9 mm was found in 4%, 45.9% and 20% of diabetic subjects at the common, bulb or internal carotid, respectively. Only 25% of patients had an HbA1c<7%, while over 41.6% presented with marked hyperglycemia (HbA1c>9%). The prevalence of diabetic subjects with abnormal levels of LDL-cholesterol, triglycerides, HDL-cholesterol or blood pressure was 45%, 16.6%, 15% and 65.7%, respectively. Conclusions Carotid thickness is increased in subjects with diabetes from a rural area of Cameroon, despite the relatively recent diagnosis. These findings and the high rate of uncontrolled diabetes in this population support the increasing concern of diabetes and cardiovascular diseases in African countries and indicate the need for multifaceted health interventions in urban and rural settings.
Coulomb Excitation of Multi-Phonon Levels of the Giant Dipole Resonance
B. F. Bayman,F. Zardi
Physics , 2009, DOI: 10.1103/PhysRevC.81.037901
Abstract: A closed expression is obtained for the cross-section for Coulomb excitation of levels of the giant dipole resonance of given angular momentum and phonon number. Applications are made to the Goldhaber-Teller and Steinwedel-Jensen descriptions of the resonance, at non-relativistic and relativistic bombarding energies.
Gauge dependence of calculations in relativistic Coulomb excitation
B. F. Bayman,F. Zardi
Physics , 2004, DOI: 10.1103/PhysRevC.71.014904
Abstract: Before a quantum-mechanical calculation involving electromagnetic interactions is performed, a choice must be made of the gauge to be used in expressing the potentials. If the calculation is done exactly, the observable results it predicts will be independent of the choice of gauge. However, in most practical calculations approximations are made, which can destroy the gauge invariance of the predictions. We compare here the results of coupled-channel time-dependent relativistic Coulomb excitation calculations, as performed in either Lorentz or Coulomb gauges. We find significant differences when the bombarding energy per nucleon is $\geq$ 2 GeV, which indicates that the common practice of relying completely on the Lorentz gauge can be dangerous.
Multichannel processes in relativistic Coulomb excitation mediated by a quantized electromagnetic field
B. F. Bayman,F. Zardi
Physics , 2004,
Abstract: This paper has been withdrawn because it draws incorrect conclusions from the results of its calculations.
Comparison of exact and approximate cross-sections in relativistic Coulomb excitation
B. F. Bayman,F. Zardi
Physics , 2003, DOI: 10.1103/PhysRevC.68.014905
Abstract: We present a new method of obtaining time-dependent matrix elements of the electromagnetic pulse produced by a highly-relativistic projectile. These matrix elements are used in a coupled-channel calculation to predict the cross-sections for population of 1- and 2-phonon states of the giant dipole resonance. Comparisons are made with the predictions of the long-wavelength and Born approximations.
Coulomb excitation at ultra-relativistic energies
B. F. Bayman,F. Zardi
Physics , 2001,
Abstract: In previous studies of the theory of Coulomb excitation, the term in the electromagnetic interaction which is quadratic in the vector potential has been ignored. In this paper, we use qualitative arguments and detailed numerical calculations to show that this quadratic term must be included when the bombarding energy is in excess of about 20 GeV per nucleon.
Equivalence of the long-wavelength approximation and the truncated Taylor expansion in relativistic Coulomb excitation
B. F. Bayman,F. Zardi
Physics , 2002, DOI: 10.1103/PhysRevC.67.017901
Abstract: The long-wavelength approximation and the truncated Taylor expansion are frequently used in the theory of relativistic Coulomb excitation to obtain multipole expansions of the interaction. It is shown in this note that these two approximations are exactly equivalent.
Relativistic Coulomb excitation at small impact parameters
B. F. Bayman,F. Zardi
Physics , 2006, DOI: 10.1103/PhysRevC.74.024905
Abstract: The semiclassical model of relativistic Coulomb excitation is studied in situations in which the impact parameter is small enough so that projectile and target charge distributions overlap. The electromagnetic effects of this overlap are shown to be small. Realistic nucleon-nucleon reaction cross-sections, and realistic nuclear radial charge and matter distributions are used to determine a formula for the lower impact parameter limit to be used in the calculation of the Coulomb excitation cross-section. A wide selection of projectile-target pairs is explored, in the bombarding energy range of 1 GeV to 5 GeV per nucleon.
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