Stress magnetic resonance imaging

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The stress-magnetic resonance imaging , including stress MRI called, is a study of the heart by means of magnetic resonance imaging (MRI) under load. The aim is to identify circulatory disorders in the heart muscle that indicate a severe narrowing of the coronary vessels . It can be used in certain cases in patients in whom coronary artery disease is urgently suspected , despite normal stress ECGs or in those who cannot undergo such an examination, as a supplement to or together with stress echocardiography and myocardial scintigraphy .

Classification

There are two types of stress MRI, perfusion stress MRI and dobutamine stress MRI.

Perfusion stress MRI

This includes, for example, the adenosine stress MRI . It enables the blood flow to the heart muscle to be displayed under pharmacological stress. The exposure is simulated by the administration of a vasodilatory drug , e.g. B. by giving adenosine or dipyridamole . The first passage of the contrast medium is recorded on temporally dynamic cross-sectional images of the heart ( perfusion MRT ). A delayed increase in brightness in a muscle segment indicates a reduced blood flow. In combination with MR vitality diagnostics , a distinction can be made between infarct-related and, for example, stenosis-related circulatory disorders.

Dobutamine stress MRI

The dobutamine stress MRI allows the function of the heart muscle to be shown under pharmacological stress. The load is simulated by a drug that increases heart activity - usually dobutamine (positive chrono and inotropic ). The heart muscle is examined for the triggerability and severity of wall movement disorders, which are very often indicative of high-grade coronary stenosis .

Individual evidence

  1. ↑ Brehm M., ea: Diagnosis of angina pectoris - symptomatology, stage diagnosis and differential diagnosis , clinic doctor 2008; 37: 465-471, doi : 10.1055 / s-0028-1103382 .

Web links

This text is based in whole or in part on the entry stress magnetic resonance tomography in Flexikon , a wiki from DocCheck . The takeover took place on November 22, 2009 under the then valid GNU license for free documentation .