Volume 19 - Issue 9 - September, 2007
Postocclusion Hyperemia Provides a Better Estimate of Coronary Reserve than Intracoronary Adenosine in Patients with Coronary Ar
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The physiologic effects of the majority of coronary artery stenosis cannot be determined accurately by conventional angiographic approaches.1,2 Coronary flow reserve3,4 (CFR), and, more recently, fractional flow reserve5 (FFR) have been proposed for assessment of the functional consequence of coronary lesions and evaluation of coronary angioplasty efficiency.6,7 In addition, CFR is a useful tool for the diagnosis of coronary microvascular disease.8,9 Because FFR is the ratio of maximal flow in a stenotic vessel to maximal flow without s
Late Angiographic Stent Thrombosis (LAST): The Cloud Behind the Drug-Eluting Stent Silver Lining?
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The widespread popularity of drug-eluting stents (DES) had a dramatic impact on the modern interventional therapy of coronary artery disease; accordingly, the cardiac surgical volume has experienced a corresponding decrease. Like the introduction of bare-metal stents (BMS) during the balloon angioplasty era, DES represent yet another quantum advancement towards overcoming the challenges of restenosis. The promises of this potential panacea, however, have been recently attenuated by the looming specter of late angiographic stent thrombosis (LAST). The usual time frame for stent thrombosis is
Secrets of Success in Unprotected Left Main Intervention: Patient and Lesion Selection
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Despite advances in percutaneous coronary intervention techniques over the last two decades, the unprotected left main has largely remained the domain of cardiovascular surgery. The subset of patients with left main disease in the Collaborative Study in Coronary Artery Surgery (CASS) study demonstrated superior outcomes with bypass surgery as compared with medical therapy.1 While percutaneous intervention of the unprotected left main artery has been reported as early as in the late 1980s, initial results with balloon angioplasty of the left main were poor, with 1-year mortal
Comparative Intravascular Ultrasound Analysis of Ostial Disease in the Left Main versus the Right Coronary Artery
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The aorto-ostial junction has high elastic fiber content with significant elastic recoil.1-7 Ostial left main coronary artery (LMCA) stenoses have larger lumen areas with less plaque burden and more negative remodeling than non-ostial LMCA stenoses. Most ostial LMCA stenoses have been categorized as eccentric and less calcified.8 The RCA ostium shows a lack of arterial distensibility and excessive rigidity, presumably because it contains highly elastic rigid tissue.1,7 Both the LMCA and RCA ostia may have similar morphologic characteristics. However, there i
Stent Undersizing Can Result in Procedure-Related Very Late Stent Thrombosis
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Stent thrombosis is rare, but very serious, with potentially fatal consequences following percutaneous coronary intervention (PCI). Traditionally, it has been classified as acute, within 48 hours, subacute up to 30 days, and late, corresponding to all cases after day 30. Acute or subacute stent thrombosis is often thought to be procedure- or lesion-related, as suggested by data from randomized studies and large registries having fairly similar rates (1–2%) between both bare-metal stents (BMS) and drug-eluting stents (DES).1–3 Late stent thrombosis (LST) with DES remai
XX and Risky Business
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There is extensive literature demonstrating a disturbingly higher mortality rate, intraprocedural coronary artery injury rate and periprocedural vascular complication rate in women versus men. The disparity has been partially explained by more comorbid disease, older age, smaller size and higher prevalence of hypertension, diabetes, peripheral vascular disease and more severe angina at presentation. Furthermore, it has been suggested that smaller vessel diameters associated with smaller body size have been a driving force for the observed higher rates of both coronary and entry-site vascula
Multivessel Acute Coronary Thrombosis and Occlusion — An Unusual Cause of Cardiogenic Shock
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Coronary angiography in the early phase of ST-elevation acute myocardial infarction (STEMI) usually identifies total thrombotic occlusion of a single infarct-related artery.1 However, simultaneous acute occlusion of all major epicardial coronary arteries is extremely unusual.2 We present a case of STEMI and cardiogenic shock associated with multiple large thrombi treated successfully by thrombus aspiration and balloon inflations.
Case Report. A 44-year old physician was transferred urgently to our catheterization unit 3 hours after a
Outlook of Drug-Eluting Stent Implantation for Unprotected Left Main Disease: Insights on Long-Term Clinical Predictors
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Unprotected left main coronary artery (LMCA) is one of the most challenging lesion subsets for interventional cardiologists, and is still considered a strict surgical indication as long-term results of recent randomized trials are awaited.
Although no adequately powered randomized comparisons have yet been completed, many registries have assessed the feasibility and safety of LMCA revascularization with bare-metal stents (BMS),1–4 particularly in good surgical candidates with a low EuroSCORE (an established means to predict early mortality in patients undergoing card
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