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Source: The International Journal of Cardiovascular Imaging

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Total 142 results found since Jan 2013.

Presence and extent of coronary calcified plaque evaluated by coronary computed tomographic angiography are independent predictors of ischemic stroke in patients with suspected coronary artery disease
Abstract Although ischemic stroke and coronary artery disease (CAD) share common risk factors and pathophysiology, the risk of stroke in patients with CAD remains unclear. We sought to evaluate the risk of ischemic stroke in patients with suspected CAD according to coronary computed tomographic angiography (CCTA) and single-photon emission computed tomography (SPECT) findings. Presence, severity, and extent of CAD were evaluated in 1137 patients with suspected CAD who underwent CCTA and SPECT. Primary outcome was the occurrence of ischemic stroke. During follow-up (median 26 months), ischemic stroke was obse...
Source: The International Journal of Cardiovascular Imaging - September 17, 2015 Category: Radiology Source Type: research

Statistical shape analysis of the left atrial appendage predicts stroke in atrial fibrillation
AbstractThe shape of the left atrium (LA) and left atrial appendage (LAA) have been shown to predict stroke in patients with atrial fibrillation (AF). Prior studies rely on qualitative assessment of shape, which limits reproducibility and clinical utility. Statistical shape analysis (SSA) allows for quantitative assessment of shape. We use this method to assess the shape of the LA and LAA and predict stroke in patients with AF. From a database of AF patients who had previously undergone MRI of the LA, we identified 43 patients with AF who subsequently had an ischemic stroke. We also identified a cohort of 201 controls with...
Source: The International Journal of Cardiovascular Imaging - May 6, 2021 Category: Radiology Source Type: research

Differences in aortic vortex flow pattern between normal and patients with stroke: qualitative and quantitative assessment using transesophageal contrast echocardiography
This study aimed to characterize aortic vortex flow pattern using transesophageal contrast echocardiography in normal and stroke patients. A total of 85 patients who diagnosed with ischemic stroke and 16 normal controls were recruited for this study. The 16 normal control subjects were designated as the control group, and the 85 ischemic stroke patients were designated as the stroke group. All subjects underwent contrast transesophageal echocardiography (TEE), and particle image velocimetry was used to assess aortic vortex flow. Qualitative and quantitative analyses of vortex flow morphology, location, phasic variation, an...
Source: The International Journal of Cardiovascular Imaging - May 31, 2016 Category: Radiology Source Type: research

Incremental predictive value of carotid arterial strain in patients with stroke
AbstractAlthough increased carotid intima-media thickness (IMT) is a well-known risk factor for stroke, carotid IMT alone is not sufficient for risk stratification. The assessment of arterial properties using velocity vector imaging (VVI) represents a new method for quantifying structural changes. We sought to investigate the characteristics and the clinical value of carotid arterial mechanics using VVI in patients with stroke. Fifty male patients (55  ± 5 years) with stroke, 30 healthy age-matched volunteers (54 ± 8 years), and 30 healthy young male volunteers (29 ± 5 years) were evaluated. The peak circ...
Source: The International Journal of Cardiovascular Imaging - January 11, 2018 Category: Radiology Source Type: research

The incidence of stroke in patients with early echocardiography after acute myocardial infarction
AbstractLeft ventricular (LV) thrombus formation after ST-elevation myocardial infarction (STEMI) increases the risk of stroke. In our center, most echocardiograms are performed within 2  days post-STEMI. However, LV thrombi often become visible later. We assessed the 1-year incidence of stroke in patients without LV thrombus on echocardiography performed early (1–2 days) vs. later (day ≥ 3) post-STEMI. This retrospective observational study included 416 patients with acut e STEMI. Patients with atrial fibrillation were excluded. All patients underwent echocardiography during admission. Patients with stroke withi...
Source: The International Journal of Cardiovascular Imaging - July 12, 2021 Category: Radiology Source Type: research

MRI-derived cardiac washout is slowed in the left ventricle and associated with left ventricular non-compaction in young patients with cryptogenic ischemic stroke
AbstractTo elucidate underlying disease mechanisms, we compared transition of gadolinium-based contrast agent bolus in cardiac chambers in magnetic resonance imaging between young patents with cryptogenic ischemic stroke and stroke-free controls. We included 30 patients aged 18 –50 years with cryptogenic ischemic stroke from the prospective Searching for Explanations for Cryptogenic Stroke in the Young: Revealing the Etiology, Triggers and Outcome (NCT01934725) study and 30 age- and gender-matched stroke-free controls. Dynamic contrast-enhanced T1-weighted first-pass pe rfusion images were acquired at 1.5 T and analyze...
Source: The International Journal of Cardiovascular Imaging - May 30, 2022 Category: Radiology Source Type: research

Multiclass machine learning vs. conventional calculators for stroke/CVD risk assessment using carotid plaque predictors with coronary angiography scores as gold standard: a 500 participants study
AbstractMachine learning (ML)-based algorithms for cardiovascular disease (CVD) risk assessment have shown promise in clinical decisions. However, they usually predict binary events using only conventional risk factors. Our overall goal was to develop the “multiclass machine learning (MCML)-based algorithms” (labelled as AtheroEdge 3.0ML) and assess whether considering carotid ultrasound imaging fused with conventional risk factors can provide better CVD/stroke risk prediction than conventional CVD risk calculators (CCVRC). Carotid ultrasound and coronary angiography were performed on 500 participants. Stenosis in the ...
Source: The International Journal of Cardiovascular Imaging - November 12, 2020 Category: Radiology Source Type: research

Quantification of aortic stiffness in stroke patients using 4D flow MRI in comparison with transesophageal echocardiography
AbstractTo quantify stiffness of the descending aorta (DAo) in stroke patients using 4D flow MRI and compare results with transesophageal echocardiography (TEE). 48 acute stroke patients undergoing 4D flow MRI and TEE were included. Intima-media-thickness (IMT) was measured in the DAo and the aorta was scrutinized for atherosclerotic plaques using TEE. Stiffness of the DAo was determined by (a) 4D flow MRI at 3  T by calculating pulse wave velocity (PWV) and by (b) TEE calculating arterial strain, stiffness index, and distensibility coefficient. Mean IMT was 1.43 ± 1.75. 7 (14.6%) subjects had no sign of atherosclero...
Source: The International Journal of Cardiovascular Imaging - May 24, 2018 Category: Radiology Source Type: research

Echocardiographic parameters determining cardiovascular outcomes in patients after acute ischemic stroke
AbstractPrevious studies have focused on only 1 or 2 echocardiographic parameters as prognostic markers in patients with acute ischemic stroke (AIS). A total of 900 patients with AIS who underwent transthoracic echocardiography (72.6  ± 12.0 years and 60% males) were retrospectively reviewed. Composite clinical events, including all-cause mortality, non-fatal stroke, non-fatal myocardial infarction, and coronary revascularization, were assessed during clinical follow-ups. During a median follow-up of 3.3 years (interquart ile range 0.6–5.1 years), there were 151 (16.8%) composite events. In the multivariable anal...
Source: The International Journal of Cardiovascular Imaging - April 15, 2020 Category: Radiology Source Type: research

Importance of saline contrast transthoracic echocardiography for evaluating large right-to-left shunt in patent foramen ovale associated with cryptogenic stroke
In conclusion , TTE identified large RL shunt associated with CS with higher sensitivity and accuracy compared to TEE. Our findings suggest that the decision for device closure should be made based on the severity of RL shunt by TTE.
Source: The International Journal of Cardiovascular Imaging - September 21, 2021 Category: Radiology Source Type: research

Accelerated analysis of three-dimensional blood flow of the thoracic aorta in stroke patients
Abstract To test if new software accelerates analysis of in vivo acquired 4D flow MRI data. Respiration-gated and ECG-synchronized 4D flow MRI of the aorta was performed in 20 stroke patients using a routine 3-Tesla MRI system (TIMTRIO, Siemens, Germany). 3D blood flow data was processed by one experienced observer using new (A = MEVISFlow) and widely-used software (B = EnSight + Velomap-/FlowTool). Evaluation included: inter-/intra-observer variability of software A and inter-software comparison regarding (1) blood flow quantification (total-/peak flow) and (2) flow visualisation, plus (3) measurement of t...
Source: The International Journal of Cardiovascular Imaging - November 14, 2014 Category: Radiology Source Type: research

Regional contribution to ventricular stroke volume is affected on the left side, but not on the right in patients with pulmonary hypertension
Abstract To develop more sensitive measures of impaired cardiac function in patients with pulmonary hypertension (PH), since detection of impaired right ventricular (RV) function is important in these patients. With the hypothesis that a change in septal function in patients with PH is associated with altered longitudinal and lateral function of both ventricles, as a compensatory mechanism, we quantified the contributions of these parameters to stroke volume (SV) in both ventricles using cardiac magnetic resonance (CMR). Seventeen patients (10 females) evaluated for PH underwent right heart catheterization (RHC) a...
Source: The International Journal of Cardiovascular Imaging - May 2, 2016 Category: Radiology Source Type: research