Which ECG leads show which coronary arteries?
Which ECG leads show which coronary arteries?
A 12-lead ECG can be used to determine the coronary artery that is most likely affected by an ischemic event. Leads II, III, and aVF provide a view of the right coronary artery, for example. Primary changes on ECG involving these three leads suggests a problem in the right coronary.
What ECG changes are associated with an occlusion to the left anterior descending artery?
Occlusion in the left circumflex artery ECG changes resemble those seen in posterior infarction due to occlusion in the RCA, namely ST-segment elevations in V7–V9 and reciprocal ST-segment depressions in V1–V3, along with high R-waves and positive T-waves in the same leads (V1–V3).
What happens if the circumflex artery is blocked?
When occluded, the circumflex coronary artery can cause a lateral myocardial infarction resulting in ST elevation in the lateral leads. The lateral ECG leads are considered lead V5-V6 and the “high lateral” ECG leads are lead I and aVL.
What is a circumflex artery?
The circumflex artery branches off the left coronary artery and encircles the heart muscle. This artery supplies blood to the outer side and back of the heart.
Does NSTEMI have Q waves?
A certain number of patients with NSTEMI develop Q waves. Other problems defying accurate definition of NSTEMI include the inability to determine whether a transient ST elevation had preceded the first available ECG and the possibility of unrecognized ST segment elevation in some leads, particularly the lead aVR.
How can you tell the difference between NSTEMI and STEMI?
STEMI results from complete and prolonged occlusion of an epicardial coronary blood vessel and is defined based on ECG criteria..NSTEMI usually results from severe coronary artery narrowing, transient occlusion, or microembolization of thrombus and/or atheromatous material.
