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Radionuclide imaging in ischaemic heart failure
James Stirrup1, Annelies Maenhout, Kshama Wechalekar
1Department of Nuclear Medicine, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, Saint Bartholomew's Hospital, West Smithfield, London EC1A 7BE, UK.
Insights
Radionuclide imaging, including PET and SPECT, effectively detects myocardial viability in heart failure. Advanced techniques offer future potential for prognosis and treatment by assessing cardiac remodeling and stem cell therapy.
Area of Science:
- Cardiovascular Imaging
- Nuclear Medicine
- Heart Failure Diagnostics
Background:
- Identifying the cause of ventricular dysfunction in heart failure is critical for timely treatment, potentially reversing myocardial damage.
- Various diagnostic tests exist for patients experiencing heart failure symptoms.
Purpose of the Study:
- To review cardiac radionuclide imaging techniques for assessing ischemic ventricular dysfunction.
- To summarize evidence and current guidelines supporting these imaging modalities.
Main Methods:
- Discussion of cardiac radionuclide imaging techniques, specifically positron emission tomography (PET) and single photon emission computed tomography (SPECT).
- Review of evidence and guidelines regarding the application of these techniques in ischemic ventricular dysfunction.
Main Results:
- PET and SPECT are validated methods for detecting myocardial viability, recommended by national and international guidelines.
- While promising for cardiac resynchronization therapy stratification, techniques assessing ventricular phase and myocardial innervation face challenges, as indicated by the PROSPECT trial.
Conclusions:
- Integrated multimodality imaging (e.g., PET/CT) is under investigation for assessing ischemic left ventricular dysfunction.
- Nuclear techniques are being explored for evaluating stem cell therapy in heart failure patients.
- Advancements in radionuclide molecular imaging for cardiac remodeling hold future implications for heart failure prognosis and treatment.
Introduction Or Background:
Many tests are available for the investigation of patients with heart failure. The identification of the underlying aetiology of ventricular dysfunction is crucial as early treatment may limit or even reverse myocardial abnormalities.
Sources Of Data:
This article describes cardiac radionuclide imaging techniques and their applications in ischaemic ventricular dysfunction. Evidence for the role of these techniques is summarized with particular reference to current guidelines.
Areas Of Agreement:
Both positron emission tomography (PET) and single photon emission computed tomography (SPECT) techniques are widely validated for the detection of myocardial viability and their use is recommended in both national and international guidelines.
Areas Of Controversy:
Although assessments of ventricular phase and myocardial innervation hold promise for the stratification of patients to cardiac resynchronization therapy, the poor performance of echocardiographic predictors of response in the recently published PROSPECT trial suggest that these techniques face a tough challenge.
Growing Points:
The use of integrated multimodality imaging techniques such as PET/computed tomography to assess for ischaemic causes of left ventricular dysfunction is an area that is currently under investigation, as is the role of nuclear techniques in the assessment of stem cell retention, distribution and function when used in patients with heart failure.
Areas Timely For Developing Research:
Ongoing developments in radionuclide molecular imaging for assessment of angiogenesis, apoptosis and interstitial alterations during cardiac remodeling may have important implications for the prognosis and treatment of patients with heart failure.
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