[ECG changes and their comparison with x-ray data in the late period after an operation for a secondary interatrial

Kardiologiia
|November 1, 1981
PubMed

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The electrical signals recorded on an electrocardiogram (ECG) occur before the mechanical processes of contraction and relaxation during the cardiac cycle.
A cardiac action potential originates in the SA node and spreads throughout the atria and the AV node in approximately 0.03 seconds. This results in the P wave in an ECG and triggers atrial contraction. The action potential is then briefly slowed at the AV node, allowing the atria to contract and fill the ventricles with blood before...
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Imaging Studies for Cardiovascular System III: X-Ray

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