VOITH-SCHNEIDEROV PORIVNI UREĐAJ Koboević, Žarko; Šundrica, Jadran; Perišić, Tomislav
NAŠE MORE,
12/2008, Volume:
55, Issue:
5-6
Paper
Open access
U ovom radu prikazan je Voith-Schneiderov porivni uređaj kao jedan od čestih propulzijskih uređaja na trajektima, tegljačima i ostalim brodovima gdje su veliki zahtjevi za manevarskim osobinama. Uz ...opis samog uređaja dan je i pregled sila na lopaticama koje rezultiraju propulzijom broda te pregled materijala za lopatice.
Voith-Schneider Propeller Koboević, Žarko; University of Dubrovnik; zarko.koboevic@unidu.hr ...
12/2008
Publication
U ovom radu prikazan je Voith-Schneiderov porivni uređaj kao jedan od čestih propulzijskih uređaja na trajektima, tegljačima i ostalim brodovima gdje su veliki zahtjevi za manevarskim osobinama. Uz ...opis samog uređaja dan je i pregled sila na lopaticama koje rezultiraju propulzijom broda te pregled materijala za lopatice.
The paper shows Voith-Schneider propeller, as one of the most convenient propulsion devices installed on ferries, tug-boats and other vessels where sophisticated manoeuvrability peformance is required. Beside the description of the device, it is given the overview of the forces acting on the blades, resulting in the propulsion of the vessel and review of materials for blade.
Although selective coronary angiography is the gold standard diagnostic technique for coronary lesions, this method does not provide all information regarding pathophysiologic mechanisms. We herein ...describe a patient in their early 60s with a 3-month history of pronounced angina. Coronary angiography revealed a central line of illumination in the proximomedial segment of the right coronary artery, suggesting a chronic coronary dissection/recanalized thrombus, along with positive remodeling and TIMI grade 2 flow. Optical coherence tomography showed a recanalized thrombus and multiple lumens separated by thin septa. Because of the significantly reduced flow and signs of ischemia in the right coronary artery irrigation territory, we decided to perform percutaneous coronary intervention. Post-treatment optical coherence tomography indicated optimal apposition and expansion of the stents with positive remodeling of the blood vessel. We believe that decisions regarding treatment modalities should be guided by the presence or absence of ischemia. Lesions that are causing myocardial ischemia should be revascularized; otherwise, medical treatment can be utilized.
Introduction
SCAD involves a sudden tear or separation within the layers of the coronary artery wall, resulting in blood flow obstruction and subsequent myocardial ischemia.
Materials and methods
A ...comprehensive literature search was conducted to identify relevant published cases of cutting balloon use in patients diagnosed with spontaneous coronary artery dissection. Electronic databases including PubMed, MEDLINE, Embase, Cochrane Library and Google Scholar were systematically searched from inception until the present using terms “cutting balloon,” “SCAD,” “acute coronary syndrome,” “intramural hematoma,” and “angioplasty.”
Results
A total of 32 published cases of cutting balloon use in spontaneous coronary artery dissection were analyzed in this study. The majority of the patients included in the analysis were female without prior history of cardiovascular disease. The median age of the SCAD population was approximately 46 years. The most frequently affected artery in SCAD cases was the Left Anterior Descending artery. Intravascular ultrasound was utilized more frequently than other modalities of adjunctive imaging techniques. The most frequent complication was the distal propagation of hematoma. Despite the successful dilation achieved with the cutting balloon, in some cases stenting was required to provide additional support.
Conclusion
The results of this analysis demonstrate that cutting balloon use in SCAD cases yields favorable outcomes.
Manifestations of Lyme carditis Kostić, Tomislav; Momčilović, Stefan; Perišić, Zoran D ...
International journal of cardiology,
04/2017, Volume:
232
Journal Article
Peer reviewed
Abstract The first data of Lyme carditis, a relatively rare manifestation of Lyme disease, were published in eighties of the last century. Clinical manifestations include syncope, light-headedness, ...fainting, shortness of breath, palpitations, and/or chest pain. Atrioventricular (AV) electrical block of varying severity presents the most common conduction disorder in Lyme carditis. Although is usually mild, AV block can fluctuates rapidly and progress from a prolonged P-R interval to a His-Purkinje block within minutes to hours and days. Rarely, Lyme disease may be the cause of endocarditis, while some studies and reports, based on serological and/or molecular investigations, have suggested possible influence of Borrelia burgdorferi on degenerative cardiac valvular disease. Myocarditis, pericarditis, pancarditis, dilated cardiomyopathy, and heart failure have also been described as possible manifestations of Lyme carditis. The clinical course of Lyme carditis is generally mild, short term, and in most cases, completely reversible after adequate antibiotic treatment.
The conventional prescriptive and descriptive models of design typically decompose the overall design process into elementary processes, such as analysis, synthesis, and evaluation. This study ...revisits some of the assumptions established by these models and investigates whether they can also be applied for modelling of problem-solution co-evolution patterns that appear during team conceptual design activities. The first set of assumptions concerns the relationship between performing analysis, synthesis, and evaluation and exploring the problem and solution space. The second set concerns the dominant sequences of analysis, synthesis, and evaluation, whereas the third set concerns the nature of transitions between the problem and solution space. The assumptions were empirically tested as part of a protocol analysis study of team ideation and concept review activities. Besides revealing inconsistencies in how analysis, synthesis, and evaluation are defined and interpreted across the literature, the study demonstrates co-evolution patterns, which cannot be described by the conventional models. It highlights the important role of analysis-synthesis cycles during both divergent and convergent activities, which is co-evolution and refinement, respectively. The findings are summarised in the form of a model of the increase in the number of new problem and solution entities as the conceptual design phase progresses, with implications for both design research and design education.
Spontaneous coronary artery dissection (SCAD) is a rare but increasingly recognized cause of acute coronary syndrome (ACS) with recent advancements in cardiac imaging facilitating its identification. ...However, SCAD is still often misdiagnosed due to the absence of angiographic hallmarks in a significant number of cases, highlighting the importance of meticulous interpretation of angiographic findings and, when necessary, additional usage of intravascular imaging to verify changes in arterial wall integrity and identify specific pathoanatomical features associated with SCAD. Accurate diagnosis of SCAD is crucial, as the optimal management strategies for patients with SCAD differ from those with atherosclerotic coronary disease. Current treatment strategies favor a conservative approach, wherein intervention is reserved for cases with persistent ischemia, patients with high-risk coronary anatomy, or patients with hemodynamic instability. In this paper, we provide a preview of invasive imaging modalities and classical angiographic and intravascular imaging hallmarks that may facilitate proper SCAD diagnosis.
Introduction. Kounis syndrome is a simultaneous manifestation of acute coronary syndrome and conditions associated with mast cell activation, such as allergies or anaphylactic reactions. We present ...early stent thrombosis in a female with an atopic constitution without previous atherosclerosis of coronary arteries. Case report. A 50-year-old woman with typical anginal pain was admitted to the Clinic for Cardiology, University Clinical Center Nis. A few hours earlier, she had passed by a linden tree in bloom. She immediately felt chest pain, paresthesia and numbness in her left arm throat tightness, heaviness of the tongue, and swelling of the lips. The symptoms disappeared for 60 min after taking 10mg of loratadine, but then they recurred. On the electrocardiographic (ECG) findings, 30 minutes after admission, ST elevation was seen in leads D2, D3, aVF, and V6. She underwent an emergency percutaneous coronary intervention procedure. Occlusive thrombosis was seen in the ostium of the left anterior descending (LAD) coronary artery. A sirolimus-coated stent was placed and thrombolysis in myocardial infarction (TIMI) 3 flow was obtained. A few hours after the intervention, the patient reported a new onset of chest pain followed by ventricular fibrillation (VF), DC shock, and the occurrence of new ST-segment elevation in aVR and V1?V3 on the ECG. Repeated angiography showed acute instent thrombotic occlusion. Balloon angioplasty was performed, which restored TIMI 3 flow in LAD coronary artery. Anticoagulant and corticosteroid therapy was administered. Three days after the intervention, optical coherence tomography imaging was performed, which showed good stent expansion and apposition, without atherosclerosis and thrombosis. Conclusion. Coronary angiography proved type I Kounis syndrome after exposure to an allergen, and type III Kounis syndrome developed shortly after stent placement when acute instent thrombosis occurred. Newly described causes of acute and sub-acute stent thrombosis in type III Kounis syndrome are stent-associated hypersensitivity reactions.
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