Blood Pressure Monitoring in Edmonton | Alberta Cardiology 2022
A stress test in cardiology is an indirect method of assessing blood flow through the coronary arteries that supply the heart muscle.
Stress testing is not a very complicated subject, but it can be a little confusing and lead to some misunderstandings. The idea is very simple. First, we found a way to assess whether the heart muscle is getting enough oxygen (called ischemia), a marker we can track during the test. When we performed a simple treadmill test, we observed a specific segment of the ECG that changed in the presence of Edmonton South Medical Facilities. With a stress echocardiogram, we examine the movement of the left ventricular wall. When the ventricles struggle for oxygen to a certain extent, the affected area becomes loose and cannot contract properly. In nuclear medicine studies, we observe where muscle tissue picks up an isotope (nuclear dye) and where it doesn't. This gives us an idea of the blood flow to each area of the heart.
Then we found a way to stretch the heart. Treadmills increase heart rate and blood pressure, as well as the force of ventricular contraction. A healthy heart has enormous functional reserves and can increase its strength tens of times. If the patient cannot walk on a treadmill, we can suppress the heart with a chemical infusion. Dobutamine more or less mimics exercise by speeding up the heart, and heart stress test results healthy arteries to temporarily dilate, effectively bypassing the flow from the diseased area.
We assessed the heart at rest, and then repeated the assessment at peak activity. If blood flow is good, we need to see good function in both places. When the major coronary arteries are more than 70% occluded, we see normal function at rest but unusual results at peak exercise. The next test ordered was cardiac catheterization to definitively diagnose and treat the affected artery.
The stress test allows us to determine with certainty whether the patient's large coronary arteries are more than 70% blocked.
Specialist in whitemud Area see how a heart attack occurs. A heart attack occurs because the cholesterol-rich plaque on the artery walls becomes unstable, ruptures, and the body tries to seal the lesion with proteins and cells, which form a clot. The clot blocks the flow in the vessels and all the muscles in the chain are deprived of oxygen. We've known for several years that the physical size of the stenosis (i.e. how tight the blockage) doesn't determine the risk of plaque rupture and complete occlusion of a blood vessel - blockage is 50% as likely to cause a heart attack. as 90% blockage. A more important indicator of whether an artery will undergo plaque rupture is the microscopic structure of the plaque: how much cholesterol has accumulated in the vessel walls and how strong the thin sheath of fibrous tissue that separates cholesterol from flowing blood is.
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