Stress tests are used for

In the stress test (stress test) is monitored via an EKG the heart and imaging procedures are often performed during an induced phase is an increased cardiac demand, so that the ischemic region is detected at risk for infarction. The heart rate is up to 85% of age-appropriate maximum value raised (target heart rate), or until symptoms develop, whichever occurs first. Stress tests are used for diagnosis of coronary heart disease (CHD) stratification of risk in patients with known CAD monitoring of patients with known CAD in patients with CHD adequate blood supply at rest may be inadequate if the cardiac needs by exercise or pharmacological stress increases. The stress test is less invasive and less expensive than the cardiac catheterization and recognizes a pathophysiological changes in blood flow. However, it is less accurate in the detection of patients with low pretest probability of coronary heart disease. The stress test can define the functional significance of an abnormality of the coronary arteries, which has been recognized with a coronary angiography as the catheter examination. Since Koronararterienplaques not significantly stenotic (d. E. Not lead to ischemia during the stress test), yet break down and can cause an acute coronary syndrome, a normal stress test result does not guarantee future freedom of myocardial infarction. Risks of stress testing are infarction and sudden cardiac death, which occur in about 1/5000 patients. The stress testing has several absolute and relative contraindications Absolute contraindications for a stress test are: Acute coronary syndrome (myocardial infarction within 48 hours or uncontrolled unstable angina) aortic dissection when acute aortic stenosis when symptomatic or difficult arrhythmias when symptomatic or hemodynamically significant heart failure in decompensated myocarditis, if acute pericarditis, if acute pulmonary embolism, if acute pulmonary infarction when acutely to the relative contraindications for a physical stress test include AV block when high degree bradyarrhythmias electrolyte imbalance hypertension (systolic RR> 200 mmHg or diastolic RR> 110 mmHg) Hypertrophic obstructive cardiomyopathy be adequately physically to operate inability due to mental or physical impairment stenosis of the heart valve, if moderate or severe stenosis of the left main coronary artery systemic disease tachyarrhythmias stress test methodology The cardiac demand may increase by Exercise drug Patients need 4-6 hours fasting before the examination be. When dipyridamole for “pharmacological stress” is used, xanthine derivatives (eg. Aminophylline, theophylline, caffeine) can cause false-negative results, which is why these substances (incl. Tea, coffee, cocoa, chocolate certain nutritional supplements and energy drinks, and caffeinated sodas) for 24 hours prior to stress testing should be avoided. Physical stress tests The physical strain is preferred to the drug load to increase cardiac demand because it mimics rather ischemia stressors. Usually the patient goes on a conventional treadmill according to the Bruce protocol or a similar protocol load until the target heart rate is reached or symptoms. (Editor’s note: In Germany is not performed treadmill exercise, but a burden on the exercise bike in the rule.) The Bruce protocol (most used) increases the treadmill speed and incline about the 3-minute interval. Exercise stress testing DR P. RAZZI / SCIENCE PHOTO LIBRARY var model = {thumbnailUrl: ‘/-/media/manual/professional/images/c0222478-exercise-stress-test-science-photo-library-high_de.jpg?la=de&thn= 0 & mw = 350 ‘, imageUrl’ /-/media/manual/professional/images/c0222478-exercise-stress-test-science-photo-library-high_de.jpg?la=de&thn=0 ‘, title:’ Physical stress test ‘ , description: ‘ u003Ca id = “v38395674 ” class = “”anchor “” u003e u003c / a u003e u003cdiv class = “”para “” u003e u003cp u003eDieses photo shows a man who subjects in exercises on the treadmill stress tests u003c / p u003e u003c / div u003e ‘credits’. DR P. RAZZI / SCIENCE PHOTO LIBRARY’

Health Life Media Team

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