Assessment of coronary stenosis severity by a Doppler guidewire
نویسندگان
چکیده
منابع مشابه
Non-invasive estimation of cardiac wall stress by using tissue doppler-echocardiography ultrasound images: People with coronary artery stenosis
In this study, a method for non-invasive estimation of stress on the heart wall in the diastole phase is presented using ultrasound echocardiography and tissue Doppler imaging. The aim of this study was to evaluate the stress on the heart wall as a pre-diagnosis to identify people with coronary artery stenosis. 29 patients with stenosis of more than 70%, 30 patients with stenosis of 50 to 7...
متن کاملNon-invasive assessment of aortic stenosis by Doppler ultrasound.
The peak pressure drop across the aortic valve in aortic stenosis has been measured by Doppler ultrasound. Maximum velocity in the Doppler signal from the aortic jet was recorded using a maximum frequency estimator. With an angle close to zero between ultrasound beam and maximal velocity in the jet, peak pressure drop can be calculated from the maximal velocity measured; a larger angle will und...
متن کامل[Relationship between coronary flow and viability in patients with myocardial infarction submitted to revascularization with stent. Assessment by Doppler guidewire].
UNLABELLED Introduction and objectives. Intracoronary Doppler guidewire measurement provides information about the state of the myocardial microcirculation. Our aim was to assess the relationship between the pattern of coronary flow and myocardial viability. Patients and method. The study included 19 patients who had had a recent myocardial infarction (< 1 month), who underwent percutaneous rev...
متن کاملUse of the continuity equation for transesophageal Doppler assessment of severity of proximal left coronary artery stenosis: a quantitative coronary angiography validation study.
OBJECTIVES We tested the value of transesophageal Doppler echocardiography (TEDE) for quantitating proximal left coronary artery (LCA) stenosis by using the continuity equation. BACKGROUND The continuity equation applied to a stenosis states that the ratio of the time-velocity integral (TVI) of prestenotic to stenotic flow velocities is equal to the ratio of stenotic to prestenotic cross-sect...
متن کاملImpact of blood pressure on the Doppler echocardiographic assessment of severity of aortic stenosis.
OBJECTIVE To investigate the impact of blood pressure (BP) on the Doppler echocardiographic (Doppler-echo) evaluation of severity of aortic stenosis (AS). METHODS Handgrip exercise or phenylephrine infusion was used to increase BP in 22 patients with AS. Indices of AS severity (mean pressure gradient (DeltaP(mean)), aortic valve area (AVA), valve resistance, percentage left ventricular stroke...
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ژورنال
عنوان ژورنال: Japanese Circulation Journal
سال: 1995
ISSN: 0047-1828,1347-4839
DOI: 10.1253/jcj.58.supplementiv_1192