Search results for "flow [Keywords]"

Computerized estimation of quality standards for the X-ray densitometric assessment of myocardial perfusion

2003

The densitometric evaluation of heart-phase-gated digital subtraction coronary angiograms derives different parameters which provide information about coronary blood flow, myocardial perfusion, and coronary flow reserve: appearance time, rise time, mean ascending time, and maximum intensity. The reliability and reproducibility of these measurements and of the derived parameters were investigated. Four digital subtraction coronary angiograms were obtained in ten patients, including two baseline measurements and two measurements under hyperemia induced by papaverine ic. Different reproducibility results were found for the parameters, depending on the heart phase of the densogram (diastolic be…

Impaired Fractional and Coronary Flow Reserve

2016

A FFR <0.80/0.75 witnesses the existence of a high-grade epicardial stenosis. In this setting, the CFR is usually also impaired since even a maximal dilation of the peripheral resistances cannot compensate for the increased epicardial resistances.

A Normal Fractional and Coronary Flow Reserve

2016

Fractional flow reserve (FFR) and coronary flow reserve (CFR) provide different and complementary information on vascular physiology. The two tests provide information, respectively, on the epicardial and total vascular resistances. Typically, a FFR <0.75 is also associated with an impaired CFR (<2); exceptions, however, exist.

Tiotropium reduces airflow obstruction in asthma patients, independent of body mass index

2019

TCT-361 Heart Team Approach to CAD Management in Patients Undergoing Elective Vascular Surgery Who Have Asymptomatic Ischemia-producing Coronary Sten…

2018

Patients undergoing peripheral vascular surgery (PVS) are at increased risk of post-op MI/death due to unrecognized CAD. Coronary CTA-derived fractional flow reserve (FFRCT) reliably identifies lesion-specific ischemia (LSI) in stable chest pain patients but has not been used in PVS patients. We

Koronare Bypassdiagnostik mit CT und MRT - eine Bestandsaufnahme

2004

The limited lifetime and the correlation between graft occlusion and recurring symptoms underline the need for repeated imaging of coronary artery bypass grafts. CT and MRI allow for non-invasive imaging of coronary bypasses with high accuracies concerning the patency of these vessels. Multidetector CT seems to be the CT technique of choice, especially after the introduction of 16 slice CT scanners for morphologic assessment of coronary artery bypass grafts. Compared with MRI, CT is a robust technique for assessment of cardiac anastomoses, native coronary arteries, and for the detection of graft stenoses. MRI, however, is able to deliver functional information about the grafts and the recip…

1-Year Outcomes of FFRCT-Guided Care in Patients With Suspected Coronary Disease

2016

Abstract Background Coronary computed tomographic angiography (CTA) plus estimation of fractional flow reserve using CTA (FFR CT ) safely and effectively guides initial care over 90 days in patients with stable chest pain. Longer-term outcomes are unknown. Objectives The study sought to determine the 1-year clinical, economic, and quality-of-life (QOL) outcomes of using FFR CT instead of usual care. Methods Consecutive patients with stable, new onset chest pain were managed by either usual testing (n = 287) or CTA (n = 297) with selective FFR CT (submitted in 201, analyzed in 177); 581 of 584 (99.5%) completed 1-year follow-up. Endpoints were adjudicated major adverse cardiac events (MACE) …

An FFR CT diagnostic strategy versus usual care in patients with suspected coronary artery disease planned for invasive coronary angiography at Germa…

2017

Aim Diagnostic evaluation practices for suspected coronary artery disease (CAD) may vary between countries. Our objective was to compare a CT-derived fractional flow reserve (FFRCT) diagnostic strategy with usual care in patients with planned invasive coronary angiography (ICA) enrolled in the PLATFORM (Prospective Longitudinal Trial of FFRCT: Outcome and Resource Impacts) study at German sites. Methods Patients were divided into two consecutive observational cohorts, receiving either usual care or CT angiography (CTA)/FFRCT. The primary endpoint was the percentage of patients planned for ICA, with no obstructive CAD on ICA within 90 days. Secondary endpoints included death, myocardial infa…

Determination of myocardial perfusion and coronary flow reserve by densitometric measurements: a selective classification of regions of interest

2002

To evaluate the functional effect of a coronary artery stenosis on the dependent myocardium, digitized coronary angiograms (DCAs) were recorded. The DCAs, acquired during heart catheterization, provide information about myocardial perfusion and coronary flow reserve of areas supplied by this coronary artery. For each analysis the myocardium is separated into different regions of interest (ROIs); 16 ROIs in the distribution of the LCA and 8 ROIs for the RCA. In addition to that, the ROIs of the diseased vessels are divided into ROIs which are proximal, within and distal to the stenosis. Using a semiautomatic procedure, densograms are constructed from which the parameter rise time is calculat…

Identification of Flow-Limiting Coronary Stenosis With PCS: A New Cost-Effective Index Derived From the Product of Corrected TIMI Frame Count and Per…

2021

Background: Identifying functional coronary stenosis with simple and cost-effective methods during invasive coronary angiography is still challenging. Corrected TIMI frame count (CTFC) is considered to be the frame count velocity of coronary blood flow. We aimed to propose a simple and cost-effective index based on CTFC and percent diameter stenosis (DS) to identify flow-limiting coronary stenosis. For this, a new index was put forward as the product of CTFC and DS (PCS). PCS can be regarded as the loss of coronary blood flow due to diameter stenosis.Methods: DS, CTFC, PCS, and Fractional flow reserve (FFR) of 111 vessels in 84 patients with suspected coronary heart disease were measured. F…