It won't. But in the long term the murmur (depending on which valve is affected) will cause hypertrophy of cardiac muscles for the different ventricles/atria. And the hypertrophy will be detected by the ECG because it will change the cardiac axis. Murmurs are easily heard using a stethoscope so and ECG isn't useful. An ECG monitors the electric impulses of the heart muscle - so better to see heart blocks, infarcts, hypertrophy, AF, SVT etc
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A simple way for a heart murmur to be detected is by having a doctor listen to your heart using a stethoscope. If they are concerned about it, there are many diagnostic tests that can be used. These include chest X-ray, ECG, CT, MRI or Echocardiogram
The duration of Murmur of the Heart is 1.97 hours.
Murmur
a heart murmur is an abnormal sound that is from your valves in your heart. The most common reason for this is due to leaks ormthe narrowing of your valves. In most cases, a heart murmur corrects on its own.
full grown dogs? probably not, but my friend's kitten was put down because of an abnormal heart murmur. It depends upon the cause, there are benign heart murmur that cause no ill effects. There's also heart murmurs caused by a defect that will result i the dog feeling tired and having less energy than he or she would normally have.