Automatic extraction of left-atrial volume from a clinical perfusion 15O-water PET

1557Objectives: nlargement of the left atrium is associated with increased left-ventricular (LV) filling pressures and poor outcome, regardless of factors such as LV ejection fraction or coronary flow reserve. LA volume (LAV) measurements are recommended by guidelines for several cardiac diseases. The aim of this study was to develop and validate an automated method of extracting left-atrial volumes from a standard cardiac perfusion PET scan. Methods: An algorithm was created for automatically segmenting the left atrium using the 4D information present in any dynamic PET scan, in this study using 15O-water as perfusion tracer. For validation, PET-LAV was compared to echo-derived LAV in 36 patients with systolic heart failure (HF) and to MRI-derived LAV in 14 patients from a cohort of 35 patients with moderate-severe mitral regurgitation (MR). As PET-LAV represents the mean LAV during the cardiac cycle, for echo, mean LAV was calculated as (1/3)[asterisk](2[asterisk]LAVdiastolic+LAVsystolic) whilst for MRI, only LAVsystolic was available. Test-retest repeatability was assessed in 15 patients referred for evaluation of ischemic heart disease (IHD), scanned twice during the same day. The method was then applied to the remaining 21 patients with MR, 14 patients with cardiac amyloidosis (CA) and, additionally, 121 consecutive patients referred for clinical assessment of myocardial blood flow. Clinical patients were grouped based on their hyperemic MBF response: normals (no documen...
Source: Journal of Nuclear Medicine - Category: Nuclear Medicine Authors: Tags: Cardiovascular Clinical Science Poster Session Source Type: research

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Conclusions: 11C-PIB PET/MR may be valuable in the noninvasive diagnosis of CA. Further study with a larger cohort of patients would be needed to confirm it.
Source: Journal of Nuclear Medicine - Category: Nuclear Medicine Authors: Tags: Cardiovascular YIA Symposium Source Type: research
In conclusion, long-term aerobic exercise appears to attenuate the decline in endothelial vascular function, a benefit which is maintained during chronological aging. However, currently there is not enough evidence to suggest that exercise interventions improve vascular function in previously sedentary healthy older adults. Hijacking the Proteasome to Dispose of Unwanted Molecules in Age-Related Disease https://www.fightaging.org/archives/2019/03/hijacking-the-proteasome-to-dispose-of-unwanted-molecules-in-age-related-disease/ Cells are equipped with a protein disposal system in the form of the proteaso...
Source: Fight Aging! - Category: Research Authors: Tags: Newsletters Source Type: blogs
Fight Aging! provides a weekly digest of news and commentary for thousands of subscribers interested in the latest longevity science: progress towards the medical control of aging in order to prevent age-related frailty, suffering, and disease, as well as improvements in the present understanding of what works and what doesn't work when it comes to extending healthy life. Expect to see summaries of recent advances in medical research, news from the scientific community, advocacy and fundraising initiatives to help speed work on the repair and reversal of aging, links to online resources, and much more. This content is...
Source: Fight Aging! - Category: Research Authors: Tags: Newsletters Source Type: blogs
Fight Aging! provides a weekly digest of news and commentary for thousands of subscribers interested in the latest longevity science: progress towards the medical control of aging in order to prevent age-related frailty, suffering, and disease, as well as improvements in the present understanding of what works and what doesn't work when it comes to extending healthy life. Expect to see summaries of recent advances in medical research, news from the scientific community, advocacy and fundraising initiatives to help speed work on the repair and reversal of aging, links to online resources, and much more. This content is...
Source: Fight Aging! - Category: Research Authors: Tags: Newsletters Source Type: blogs
In conclusion, we have developed an effective PILs strategy to deliver the AUF1 plasmid to a specific target, and this system may be useful for the development of new anti-aging drugs. Considering the Evidence for Vascular Amyloidosis as a Cause of Aging https://www.fightaging.org/archives/2017/11/considering-the-evidence-for-vascular-amyloidosis-as-a-cause-of-aging/ The balance of evidence for the aging of the cardiovascular system suggests the following view. It starts off in the blood vessels, with the accumulation of senescent cells and cross-links. Cross-links directly stiffen these tissues, while ...
Source: Fight Aging! - Category: Research Authors: Tags: Newsletters Source Type: blogs
AbstractPurpose of ReviewVentricular arrhythmias (VAs) are a significant cause of morbidity and mortality in patients with cardiomyopathy (CM). This review focuses on ventricular tachycardia (VT) management in uncommon causes of heart disease, such as inflammatory and infiltrative CMs.Recent FindingsIntegration of advanced cardiac imaging modalities, such as cardiac magnetic resonance imaging (MRI) and positron emission tomography (PET), into diagnostic evaluation of patients with CM may unmask abnormal myocardial substrate in almost half of patients presenting with VAs. Stepwise approach to management of VAs in cardiac sa...
Source: Current Cardiovascular Risk Reports - Category: Cardiology Source Type: research
This open access paper takes a brief tour of the dominant themes in the aging of heart tissue, viewed structurally and biochemically. These are some of the changes that have yet to be assembled into a coherent and generally agreed upon chain of events, starting with fundamental cellular damage, and proceeding through successive layers of cause and consequence in reaction to that damage. Most of the research community begins a line of inquiry with an investigation of one facet of the aged, diseased state. Researchers then attempt to work backwards to identify and address proximate causes of the observed problems, one by one...
Source: Fight Aging! - Category: Research Authors: Tags: Daily News Source Type: blogs
Transthyretin-related cardiac amyloidosis is a progressive infiltrative cardiomyopathy that mimics hypertensive and hypertrophic heart disease and often goes undiagnosed. In the United States, the hereditary form disproportionately afflicts black Americans, who when compared with whites with wild-type transthyretin amyloidosis, a phenotypically similar condition, present with more advanced disease despite having a noninvasive method for early identification (genetic testing). Although reasons for this are unclear, this begs to consider the inadequate access to care, societal factors, or a biological basis. In an effort to ...
Source: Circulation: Heart Failure - Category: Cardiology Authors: Tags: Heart Failure Advances in Heart Failure Source Type: research
Please wait while the activity loads. If this activity does not load, try refreshing your browser. Also, this page requires javascript. Please visit using a browser with javascript enabled. If loading fails, click here to try again Click on the 'Start' button to begin the mock test. After answering all questions, click on the 'Get Results' button to display your score and the explanations. There is no time limit for this mock test. Start Congratulations - you have completed DM / DNB Cardiology Entrance Mock Test 6. You scored %%SCORE%% out of %%TOTAL%%. Your performance has been rate...
Source: Cardiophile MD - Category: Cardiology Authors: Tags: Cardiology MCQ DM / DNB Cardiology Entrance Source Type: blogs
ConclusionThis study suggested that the EMT‐diff could discriminate patients with a high risk of cardiac events among patients with pathological LV hypertrophy.
Source: Echocardiography - Category: Cardiology Authors: Tags: Original Investigation Source Type: research
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