Search results for: Andrew M. Crean

Items from 21 to 40 out of 41 results

article

Cardiovascular CT in the diagnosis of pericardial constriction: Predictive value of inferior vena cava cross-sectional area

Kate Hanneman, Paaladinesh Thavendiranathan, Elsie T. Nguyen, Hadas Moshonov, more

Journal of Cardiovascular Computed Tomography > 2014 > 8 > 2 > 149-157

The diagnosis of pericardial constriction remains challenging.We sought to evaluate the predictive value of cardiovascular CT-based measurements of inferior vena cava (IVC) parameters in the diagnosis of pericardial constriction.Forty-two consecutive patients referred for assessment of pericardial constriction by 64-slice CT were evaluated. The diagnosis of pericardial constriction was confirmed by...

article

Computed Tomography and Magnetic Resonance Imaging of the Coronary Sinus: Anatomic Variants and Congenital Anomalies

Yingming Amy Chen, Elsie T. Nguyen, Carole Dennie, Rachel M. Wald, more

Insights into Imaging > 2014 > 5 > 5 > 547-557

The coronary sinus (CS) is an important vascular structure that allows for access into the coronary veins in multiple interventional cardiology procedures, including catheter ablation of arrhythmias, pacemaker implantation and retrograde cardioplegia. The success of these procedures is facilitated by the knowledge of the CS anatomy, in particular the recognition of its variants and anomalies. This...

article

The Effect of Percutaneous Coronary Intervention of Chronically Totally Occluded Coronary Arteries on Left Ventricular Global and Regional Systolic Function

Idan Roifman, Gideon A. Paul, Mohammad I. Zia, Lynne K. Williams, more

Canadian Journal of Cardiology > 2013 > 29 > 11 > 1436-1442

Percutaneous coronary intervention (PCI) is frequently attempted to open chronic total occlusions (CTOs) and restore epicardial coronary flow. Data suggest adverse outcomes in the case of PCI failure. We hypothesized that failure to open a CTO might adversely affect regional cardiac function and promote deleterious cardiac remodelling, and success would improve global and regional cardiac function...

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Accuracy of Right and Left Ventricular Functional Assessment by Short-Axis vs Axial Cine Steady-State Free-Precession Magnetic Resonance Imaging: Intrapatient Correlation With Main Pulmonary Artery and Ascending Aorta Phase-Contrast Flow Measurements

Susan H. James, Rachel Wald, Bernd J. Wintersperger, Laura Jimenez-Juan, more

Canadian Association of Radiologists Journal > 2013 > 64 > 3 > 213-219

The left ventricle (LV) is routinely assessed with cardiac magnetic resonance imaging (MRI) by using short-axis orientation; it remains unclear whether the right ventricle (RV) can also be adequately assessed in this orientation or whether dedicated axial orientation is required. We used phase-contrast (PC) flow measurements in the main pulmonary artery (MPA) and the ascending aorta (Aorta) as nonvolumetric...

article

Postpartum Type B Aortic Dissection in Marfan Syndrome

Julia D. Kulikowski, Jack M. Colman, Candice K. Silversides, Andrew M. Crean, more

The Annals of Thoracic Surgery > 2013 > 96 > 2 > 705

article

High‐Resolution 3D Scar Imaging Using a Novel Late Iodine Enhancement Multidetector CT Protocol to Guide Ventricular Tachycardia Catheter Ablation

ANDREW M. CREAN, DANNA A. SPEARS, ADRIAN M. SUSZKO, VIJAY S. CHAUHAN

Journal of Cardiovascular Electrophysiology > 24 > 6 > 708 - 710

Scar delineation with late gadolinium‐enhanced MRI can direct VT substrate mapping and ablation, but imaging is poor and relatively contraindicated in the majority of patients with ICDs. We present a case of scar definition using late iodine‐enhanced multidetector CT in a patient with ischemic cardiomyopathy and multiple ICD shocks for VT. CT images were acquired using a novel intracoronary contrast...

article

Right heart characteristics and exercise parameters in adults with Ebstein anomaly: New perspectives from cardiac magnetic resonance imaging studies

Daniel Tobler, Sergey Yalonetsky, Andrew M. Crean, John T. Granton, more

International Journal of Cardiology > 2013 > 165 > 1 > 146-150

The utility of cardiac magnetic resonance imaging (CMR) for assessment of adults with Ebstein anomaly is not well-defined. We sought to evaluate CMR characteristics in this population and to relate these to exercise parameters.We analyzed CMR studies in adults with unrepaired Ebstein anomaly for measures of severity of Ebstein disease, including atrialized, functional and total right ventricular (RV)...

article

Failed heart rate control with oral metoprolol prior to coronary CT angiography: effect of additional intravenous metoprolol on heart rate, image quality and radiation dose

Laura Jiménez-Juan, Elsie T. Nguyen, Bernd J. Wintersperger, Hadas Moshonov, more

The International Journal of Cardiovascular Imaging > 2013 > 29 > 1 > 199-206

The purpose of this study was to evaluate the effect of intravenous (IV) metoprolol after a suboptimal heart rate (HR) response to oral metoprolol (75–150 mg) on HR control, image quality (IQ) and radiation dose during coronary CTA using 320-MDCT. Fifty-three consecutive patients who failed to achieve a target HR of < 60 bpm after an oral dose of metoprolol and required supplementary IV metoprolol...

article

Assessment of right ventricular volumes and function using cardiovascular magnetic resonance cine imaging after atrial redirection surgery for complete transposition of the great arteries

Laura Jimenez-Juan, Subodh B. Joshi, Bernd J. Wintersperger, Andrew T. Yan, more

The International Journal of Cardiovascular Imaging > 2013 > 29 > 2 > 335-342

Cardiovascular magnetic resonance (CMR) imaging is the reference standard for measurement of right ventricular (RV) volumes and function. To date, no study has compared methods of data acquisition and analysis by CMR for adults with a systemic RV. Our objective was to evaluate RV size and function using axial and short axis views in adults post atrial switch (Mustard) surgery. A total of 34 adults...

article

Impact of asymmetry on measurements of the aortic root using cardiovascular magnetic resonance imaging in patients with a bicuspid aortic valve

Felipe S. Torres, Jonathan D. Windram, Timothy J. Bradley, Bernd J. Wintersperger, more

The International Journal of Cardiovascular Imaging > 2013 > 29 > 8 > 1769-1777

To assess the impact of aortic root asymmetry on the relationship between aortic dimensions derived from two-dimensional transthoracic echocardiography (TTE) as compared with cross-sectional cardiovascular magnetic resonance (CMR) imaging in adults with a bicuspid aortic valve (BAV). Maximal CMR cross-sectional aortic measurements at the level of the sinuses of Valsalva, including cusp–commissure,...

article

Heterogeneity of myocardial iron distribution in response to chelation therapy in patients with transfusion-dependent anemias

Kate Hanneman, Vikram M. Raju, Hadas Moshonov, Richard Ward, more

The International Journal of Cardiovascular Imaging > 2013 > 29 > 7 > 1517-1526

The purpose of this study is to examine the effect of different iron chelation regimens on the distribution of myocardial iron in patients with transfusion-dependent anemias. Institutional review board approval was obtained. Patients treated with iron chelation therapy who had undergone baseline and 1-year follow-up cardiac T2* MR studies in a four-year period were identified retrospectively. One...

article

Relationship of bipolar and unipolar electrogram voltage to scar transmurality and composition derived by magnetic resonance imaging in patients with nonischemic cardiomyopathy undergoing VT ablation

Danna A. Spears, Adrian M. Suszko, Rupin Dalvi, Andrew M. Crean, more

Heart Rhythm > 2012 > 9 > 11 > 1837-1846

Bipolar voltage mapping has a role in defining endocardial-based scar in postinfarct patients undergoing ventricular tachycardia catheter ablation. The utility of bipolar and unipolar voltages in characterizing scar has not been evaluated in patients with nonischemic cardiomyopathy. To relate left ventricular (LV) endocardial bipolar and unipolar voltages in these patients to scar transmurality...

article

The left heart after pulmonary valve replacement in adults late after tetralogy of Fallot repair

Daniel Tobler, Andrew M. Crean, Andrew N. Redington, Glen S. Van Arsdell, more

International Journal of Cardiology > 2012 > 160 > 3 > 165-170

Adverse ventricular-ventricular interactions have been recognized in those with repaired tetralogy of Fallot (TOF) and severe pulmonary regurgitation.We aimed to examine the impact of pulmonary valve replacement (PVR) on the left heart late after TOF repair.Left ventricular (LV) volumes and ejection fractions (EF) were analyzed in adults with severe pulmonary regurgitation after TOF repair with cardiac...

article

Persistent Left Superior Vena Cava With Retrograde Drainage From the Left Atrium Into the Left Brachiocephalic Vein

Yingming A. Chen, Subodh B. Joshi, Andrew M. Crean, Andrew T. Yan, more

Journal of the American College of Cardiology > 2011 > 58 > 20 > 2141

article

Cardiac Magnetic Resonance Imaging and the Assessment of Ebstein Anomaly in Adults

Sergey Yalonetsky, Daniel Tobler, Matthias Greutmann, Andrew M. Crean, more

The American Journal of Cardiology > 2011 > 107 > 5 > 767-773

No published studies have evaluated the role of cardiac magnetic resonance (CMR) imaging for the assessment of Ebstein anomaly. Our objective was to evaluate the right heart characteristics in adults with unrepaired Ebstein anomaly using contemporary CMR imaging techniques. Consecutive patients with unrepaired Ebstein anomaly and complete CMR studies from 2004 to 2009 were identified (n = 32). Volumetric...

article

Strategies for Radiation-dose Reduction and Image-quality Optimization in Multidetector Computed Tomographic Coronary Angiography

Felipe S. Torres, Andrew M. Crean, Elsie T. Nguyen, Narinder Paul

Canadian Association of Radiologists Journal > 2010 > 61 > 5 > 271-279

The technological evolution of computed tomography (CT) in the last decade has placed CT coronary angiography (CTCA) in the spotlight of imaging modalities available to evaluate patients with coronary artery disease. Widespread utilisation of CTCA has generated concern from the medical community regarding potential health issues related to the significant radiation exposure associated with this method,...

article

Role of MDCT coronary angiography in the evaluation of septal vs interarterial course of anomalous left coronary arteries

Felipe S. Torres, Elsie T. Nguyen, Carole J. Dennie, Andrew M. Crean, more

Journal of Cardiovascular Computed Tomography > 2010 > 4 > 4 > 246-254

Conventional coronary angiography (CCA) may be inaccurate to distinguish between interarterial and septal subtypes of anomalous left coronary arteries (CAs).We compared the classification of anomalous left CA arising from the right sinus of Valsalva (RSV) or right CA on the basis of multidetector computed tomography coronary angiography (MDCTCA) with the classification derived from CCA.A retrospective...

article

Real-world outcome from ST elevation myocardial infarction in the very elderly before and after the introduction of a 24/7 primary percutaneous coronary intervention service

Rhidian J. Shelton, Andrew M. Crean, Kathryn Somers, Claire Priestley, more

American Heart Journal > 2010 > 159 > 6 > 956-963

It remains unclear whether the superiority of primary percutaneous coronary intervention (PPCI) over thrombolysis for the treatment of ST elevation myocardial infarction (STEMI) extends to the very elderly. Furthermore, the deliverability and efficacy of PPCI in over the 80s has not been investigated in a real-world setting. The aim of this study was to compare outcome from STEMI in patients aged...

article

Abolition of Respiratory-Motion Artifact in Computed Tomography Coronary Angiography with Ultrafast Examinations: A Comparison Between 64-row and 320-row Multidetector Scanners

Felipe S. Torres, Andrew M. Crean, Elsie T. Nguyen, Ravi Menezes, more

Canadian Association of Radiologists Journal > 2010 > 61 > 1 > 5-12

To compare the incidence of respiratory artifact in computed tomography (CT) coronary angiography performed with 64-row and 320-row multidetector scanners and to assess its effect on coronary evaluability.A retrospective review of consecutive coronary angiograms performed on a 64-row multidetector CT from March to April 2007 (group 1: 115 patients, 63 men; mean age [standard deviation] 59.6 ± 12.8...

article

A sweet tooth as the root cause of cardiac arrest

Andrew M. Crean, Saif-El-Dean T. Abdel-Rahman, John P. Greenwood

Canadian Journal of Cardiology > 2009 > 25 > 10 > e357-e358

A 71-year-old woman was admitted with hypotension and bradycardia. An electrocardiogram showed flattened T waves and increased U wave prominence, resulting in a long QT(U) syndrome. Her initial serum potassium level was 1.6 mmol/L (all other electrolytes, including magnesium, were normal). She suffered recurrent ventricular tachycardia and ventricular fibrillation arrest requiring direct current cardioversion...

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Search results for: Andrew M. Crean

Cardiovascular CT in the diagnosis of pericardial constriction: Predictive value of inferior vena cava cross-sectional area

Computed Tomography and Magnetic Resonance Imaging of the Coronary Sinus: Anatomic Variants and Congenital Anomalies

The Effect of Percutaneous Coronary Intervention of Chronically Totally Occluded Coronary Arteries on Left Ventricular Global and Regional Systolic Function

Accuracy of Right and Left Ventricular Functional Assessment by Short-Axis vs Axial Cine Steady-State Free-Precession Magnetic Resonance Imaging: Intrapatient Correlation With Main Pulmonary Artery and Ascending Aorta Phase-Contrast Flow Measurements

Postpartum Type B Aortic Dissection in Marfan Syndrome

High‐Resolution 3D Scar Imaging Using a Novel Late Iodine Enhancement Multidetector CT Protocol to Guide Ventricular Tachycardia Catheter Ablation

Right heart characteristics and exercise parameters in adults with Ebstein anomaly: New perspectives from cardiac magnetic resonance imaging studies

Failed heart rate control with oral metoprolol prior to coronary CT angiography: effect of additional intravenous metoprolol on heart rate, image quality and radiation dose

Assessment of right ventricular volumes and function using cardiovascular magnetic resonance cine imaging after atrial redirection surgery for complete transposition of the great arteries

Impact of asymmetry on measurements of the aortic root using cardiovascular magnetic resonance imaging in patients with a bicuspid aortic valve

Heterogeneity of myocardial iron distribution in response to chelation therapy in patients with transfusion-dependent anemias

Relationship of bipolar and unipolar electrogram voltage to scar transmurality and composition derived by magnetic resonance imaging in patients with nonischemic cardiomyopathy undergoing VT ablation

The left heart after pulmonary valve replacement in adults late after tetralogy of Fallot repair

Persistent Left Superior Vena Cava With Retrograde Drainage From the Left Atrium Into the Left Brachiocephalic Vein

Cardiac Magnetic Resonance Imaging and the Assessment of Ebstein Anomaly in Adults

Strategies for Radiation-dose Reduction and Image-quality Optimization in Multidetector Computed Tomographic Coronary Angiography

Role of MDCT coronary angiography in the evaluation of septal vs interarterial course of anomalous left coronary arteries

Real-world outcome from ST elevation myocardial infarction in the very elderly before and after the introduction of a 24/7 primary percutaneous coronary intervention service

Abolition of Respiratory-Motion Artifact in Computed Tomography Coronary Angiography with Ultrafast Examinations: A Comparison Between 64-row and 320-row Multidetector Scanners

A sweet tooth as the root cause of cardiac arrest

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