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Benjamin Hayes——Works at Google, Lives in Mountain View. Holds a degree in Computer Science from Stanford University.
As a domain expert in cardiology, I can tell you that the QRS complex is a specific pattern on an electrocardiogram (ECG or EKG) that represents the electrical activity of the ventricles as they depolarize, or contract, to pump blood out of the heart. The QRS complex is a crucial part of the heart's electrical conduction system and is typically described as having three distinct phases: the Q wave, the R wave, and the S wave.
The Q wave is usually the first negative deflection (a downward dip) after the P wave, which represents atrial depolarization. The R wave is the first positive deflection (an upward spike) of the QRS complex, and it indicates the spread of electrical activity through the ventricles. The S wave follows the R wave and is the negative deflection that represents the completion of ventricular depolarization.
Abnormalities in the QRS complex can indicate various cardiac conditions, such as bundle branch block, ventricular hypertrophy, or even myocardial infarction (heart attack).
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Lucas Kim——Works at the United Nations Office on Drugs and Crime, Lives in Vienna, Austria.
The QRS complex is a name for the combination of three of the graphical deflections seen on a typical electrocardiogram (EKG or ECG). It is usually the central and most visually obvious part of the tracing. It corresponds to the depolarization of the right and left ventricles of the human heart.read more >>
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