• Single-photon emission computed tomography (SPECT) myocardial perfusion imaging (MPI) with technetium-99m ( 99m Tc)-labelled radiotracers. (cadth.ca)
  • A myocardial perfusion SPECT (single photon emission computed tomography) test is a procedure that demonstrates the function of the myocardium. (medscape.com)
  • In a recent study published in Scientific Reports , researchers investigated the performance of a machine learning (ML)-based model in evaluating radiomic features to diagnose coronary artery disease (CAD) and its susceptibility using myocardial perfusion imaging (MPI) single-photon emission computed tomography (SPECT) images. (news-medical.net)
  • 7,8 Through sequential image acquisition, the gamma camera works with a computer to evaluate cardiac function and perfusion. (cadth.ca)
  • Biomarkers of myocardial ischaemia, such as troponins and electrocardiography (ECG), have limited utility for diagnosing cardiac ischaemia in patients with advanced CKD. (bvsalud.org)
  • A heart perfusion imaging scan can also evaluate the effectiveness of certain cardiac treatments, such as coronary artery stenting or bypass surgery . (medicalnewstoday.com)
  • Dobutamine increases myocardial contractility by stimulating beta-1 adrenergic receptors in the heart, and causes vasodilation by stimulating beta-2 adrenergic receptors in blood vessels, complemented by reflex vasoconstriction to the increase cardiac output. (the-medical-dictionary.com)
  • The FDA placed regadenoson on its quarterly list of drugs to monitor in September after it received reports possibly linking the drug to myocardial infarctions (MI) and death during the second quarter of 2013 through its FDA Adverse Event Reporting System (FAERS) database. (medscape.com)
  • These disorders can also decrease relative myocardial perfusion because myocardial mass is increased (causing decreased diastolic flow). (msdmanuals.com)
  • In some patients, myocardial ischaemia produces a significant transient decrease in the diastolic or systolic function of the ventricle that is responsible for exertional dyspnoea. (ersjournals.com)
  • The most widely used test to obtain objective evidence of myocardial ischaemia is treadmill exercise testing with a sensitivity of 60-70% and a specificity of ∼80% 4 . (ersjournals.com)
  • 7 Viable myocardial cells take up the radionuclide tracer (either thallium isotope [ 201 TI] or isotope 99m Tc-labelled radiotracer) in proportion to blood flow. (cadth.ca)
  • Angina pectoris (literally, "strangling" in the chest) is a syndrome of recurrent discomfort in the chest or related areas associated with myocardial ischaemia or dysfunction but without myocardial necrosis 1 . (ersjournals.com)
  • Myocardial blood flow in patients with low-flow, low-gradient aortic stenosis: differences between true and pseudo-severe aortic stenosis. (bmj.com)
  • Impairment of myocardial flow reserve (MFR) in aortic stenosis (AS) with normal left ventricular function relates to the haemodynamic severity. (bmj.com)
  • Because myocardial oxygen demand is determined mainly by heart rate, systolic wall tension, and contractility, narrowing of a coronary artery typically results in angina that occurs during exertion and is relieved by rest. (msdmanuals.com)
  • Ultimately, only a coronary blood flow is increased due to a simultaneous increase fraction of angina patients is treated with revascularization (5- in coronary perfusion pressure and a decrease in coronary 7). (readkong.com)
  • 1. Aggarwal NR, Drozdova A, Askew JW, Kemp BJ, Chareonthaitawee P. Feasibility and diagnostic accuracy of exercise treadmill nitrogen-N-13 Ammonia PET myocardial perfusion imaging of obese patients. (ionetix.com)
  • We sought to prospectively compare the diagnostic value of combined WM, CFR-LAD, and MPI assessment during dipyridamole SE in patients undergoing clinically indicated coronary angiography. (thoracickey.com)
  • METHODS: Twenty-five patients with untreated mild essential hypertension and normal coronary vessels and 10 control subjects underwent dipyridamole-rest Tc-99m sestamibi imaging. (cnr.it)
  • CONCLUSION: Sestamibi imaging may detect impaired coronary vascular function in response to dipyridamole in patients with untreated mild essential hypertension and normal coronary arteries. (cnr.it)
  • Nuclear cardiology studies employ non-invasive techniques for assessing myocardial blood flow, the heart's pumping function, and also to identify the size and location of the damaged heart tissue. (azheartdoctor.com)
  • the corresponding decrease in signal intensity observed depends on the local Gd concentration, which may be considered a proxy for perfusion. (wikipedia.org)
  • Perfusion is the passage of fluid through the lymphatic system or blood vessels to an organ or a tissue. (wikipedia.org)
  • Perfusion measurements are taken by comparing the radioactivity of selected regions within the body to radioactivity of blood samples withdrawn at the time of microsphere injection. (wikipedia.org)
  • The acquired time series data are then postprocessed to obtain perfusion maps with different parameters, such as BV (blood volume), BF (blood flow), MTT (mean transit time) and TTP (time to peak). (wikipedia.org)
  • To investigate whether myocardial blood flow (MBF) and MFR differ in low-flow, low-gradient AS depending on whether there is underlying true-severe AS (TSAS) or pseudo-severe AS (PSAS). (bmj.com)
  • After a heart attack , a perfusion scan can assess damage to the heart muscle and help doctors identify areas with reduced blood flow, which can guide treatment decisions and rehabilitation plans. (medicalnewstoday.com)
  • Changes in myocardial blood flow in a canine model of left sided breast cancer radiotherapy. (ottawaheart.ca)
  • Myocardial blood flow (MBF) was estimated by measuring first transit counts in pulmonary artery and myocardial counts from tomograhic images. (cnr.it)
  • Regional myocardial function can be estimated visually in an SSFP sequence, but can be quantified more accurately using myocardial tagging techniques such as spatial modulation of magnetisation. (ecrjournal.com)
  • MRI is considered the gold standard in the evaluation of myocardial function. (ecrjournal.com)
  • MRI is now considered the gold standard in the evaluation of myocardial function because of its high accuracy as well as inter- and intra-observer reproducibility. (ecrjournal.com)
  • Alternating LBBB and RBBB: suggests extensive myocardial injury and high risk of CHB. (abcmedicalnotes.com)
  • Modelling of DCE-MRI yields parameters related to vascular permeability and extravasation transfer rate (see main article on perfusion MRI). (wikipedia.org)