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Q-R-S Complex
A series of deflections in an ECG representing ventricular depolarization, preceding the contraction of the ventricles.
Ventricular Depolarization
A stage in the cardiac cycle where ventricles contract, triggered by electrical impulses that precede the pumping of blood.
ECG
Electrocardiogram, a medical test that measures the electrical activity of the heart to detect heart problems.
Plethysmogram
A graph or recording that measures changes in volume within an organ or whole body (often the blood volume changes in the limbs).
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