Improved Diagnosis of Congenital Heart Disease by Magnetic Resonance Imaging Using Vasovist (CHD Vasovist)
Recruitment status was Recruiting
Magnetic Resonance Imaging (MRI) is an effective and radiation free method of diagnosing Congenital Heart Disease (CHD). MRI works by taking images of the anatomy and physiology. These images also provide information on the hearts function and blood flow. The clarity of these images is enhanced by the use of contrast agents (dyes). However these agents only stay in the blood vessels for a short time and therefore limit the time in which the better quality images can be obtained. This study aims to determine whether MRI using Vasovist (a dye that stays in the vessels for a prolonged period of time) can improve the diagnosis of Congenital Heart Disease (CHD) by allowing more areas to be imaged and the improved assessment of various parameters (anatomy, volumes, flow) as well as vastly improving image quality.
|Study Design:||Primary Purpose: Diagnostic|
|Official Title:||Improved Diagnosis of Congenital Heart Disease by Magnetic Resonance Imaging Using Vasovist|
- The improvement of diagnosis of CHD, due to larger coverage of vascular territories, higher spatial resolution, faster acquisition and higher quality of MR-flow measurements using Vasovist in comparison with standard Gd-agent
- The improvement of image quality will be analysed by measuring the SNR, the CNR, the vessel sharpness. In addition, the overall image quality will be scored by three independent readers (scale: excellent, good, ok, bad)
- Ventricular volumes measured from the acquired data will be compared with respect to a reference
- The accuracy (standard deviation) and reproducibility of the flow measurements will be compared using the two different agents
- No secondary outcome measures.
|Study Start Date:||March 2007|
|Estimated Study Completion Date:||December 2009|
|Estimated Primary Completion Date:||July 2008 (Final data collection date for primary outcome measure)|
We planned an intra-individual study, where 20 adult patients with CHD (e.g. Fallot Tetralogy, s/p corrective surgery, single ventricle s/p Fontan operation, aortic and pulmonary artery stenosis) will undergo two examinations. Both scans are aimed to assess different diagnostic parameter like angiography, cardiac anatomy, ventricular volume and flow.
The first clinically indicated scan in our clinically established imaging protocol is performed using a standard contrast agent. The second scan is performed using a new protocol with Vasovist within the next seven days. Informed consent for the additional second scan will be obtained. In order to optimise the scan protocol for Vasovist we plan a pilot phase using three patients. Dosage of the two contrast agents will be within the approved dose. Any adverse events will be immediately reported. The following diagnostic parameters will be assessed and compared between standard Gadolinium (Gd) agent and Vasovist.
- MR-Angiography (MRA): assessment of the MRA quality of the large systemic and the pulmonary vessel (arterial and venous) by measuring the Contrast-to-Noise Ratio (CNR) and the vessel sharpness. In addition, the overall image-quality will be scored by three independent readers (scale: excellent, good, ok, bad).
- Cardiac Anatomy: assessment of image quality of the cardiac anatomy from 3D single/dual phase MRI by measuring Signal-to-Noise Ratio (SNR) and CNR as well as assessing the overall image quality by three independent readers (scale: excellent, good, ok, bad).
- Ventricular Volumes: comparison of systolic and diastolic volumes measured from multi-slice 2D short axis cine MRI, two single phases 3D whole heart MRI (diastole and systole).
- Flow: the different flow values will be measured in the large vessels using the Phase Contrast Angio (PCA) data. Furthermore, the flow reproducibility will be determined by using two scans. The overall scan-time to assess all these parameter will be approximately 40 minutes. The intra-individual study allows a direct comparison of the different parameters in a number of vascular territories.
|Contact: Reza Razavi, MD||020-7188-5440 ext firstname.lastname@example.org|
|Division of Imaging Sciences||Recruiting|
|London, United Kingdom, SE1 7EH|
|Contact: Reza Razavi, MD 020-7188-5440 ext 85440 email@example.com|
|Principal Investigator: Reza Razavi, MD|