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Studies of the heart using magnetic resonance
1Magnetic Resonance Unit, Royal Brompton National Heart and Lung Hospital, London, England.
Insights
Magnetic resonance (MR) offers a noninvasive method for detecting early vascular disease, a leading cause of death. This technology enables monitoring treatment efficacy and facilitates early diagnosis for cardiovascular conditions.
Area of Science:
- Cardiovascular Medicine
- Medical Imaging
- Preventive Cardiology
Background:
- Cardiovascular medicine traditionally focuses on end-stage disease management.
- Occlusive vascular disease, a major cause of mortality, often progresses presymptomatically.
- Lack of noninvasive, safe, and repeatable methods hindered early detection and monitoring of vascular disease.
Purpose of the Study:
- To highlight the limitations of previous diagnostic and monitoring methods for vascular disease.
- To introduce magnetic resonance (MR) as a transformative tool in cardiovascular medicine.
- To discuss the potential of MR in early detection, population screening, and treatment evaluation.
Main Methods:
- Utilizes the principle of atomic nuclei precession in a magnetic field.
- Generates unique magnetic fields to analyze emitted radio signals.
- Produces high-resolution anatomical images and functional information, including blood flow.
Main Results:
- Magnetic resonance (MR) provides accurate anatomical and functional cardiovascular insights.
- MR is established for congenital heart disease and aortic disease diagnosis.
- MR is emerging as a tool for evaluating cardiovascular drugs and drug efficacy.
Conclusions:
- Occlusive vascular disease is reversible and not a normal aging process.
- MR offers a noninvasive solution for detecting presymptomatic vascular disease.
- MR is poised to become a standard for cardiovascular disease diagnosis, drug evaluation, and population screening.
Abstract:
Cardiovascular medicine is based on high-technology management of end-stage disease. Preventive medicine is preferable but, before magnetic resonance (MR), there was no noninvasive, safe, repeatable method of detecting occlusive vascular disease, which accounts for more deaths than any other disease at a presymptomatic stage. Demographic and animal studies show that occlusive vascular disease is not a normal aging process and is reversible. There was no method of monitoring the efficacy of preventive and therapeutic measures other than long, expensive, and sometimes inconclusive clinical trials. The rate of precession of atomic nuclei in a magnetic field is related to field strength. Creating a unique magnetic field in each volume of interest allows analysis of emitted radio signals to produce an image containing information about movement and local biochemical environments. MR produces accurate high resolution anatomical images and functional information including blood flow. It is already established as a method of choice in clinical cardiology for congenital heart disease and aortic disease. It is becoming established as a method of evaluating cardiovascular-active drugs, and in the future MR will be used for diagnosis and as a population-screening instrument for all cardiovascular disease including coronary artery disease.