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en.wikipedia.org/wiki/QRS_complex

The QRS complex is 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; in other words, it's the main spike seen on an ECG line.

quizlet.com/159969205/pqrst-complex-flash-cards

is the time from the beginning of atrial contraction to the beginning of ventricular contraction, contains the P-wave (depolarization of the atria) and the spread of the electrical impulse through the AV node, bundle of His, right and left bundle branches, and purkinje fibers

www.encyclopedia.com/.../pqrst-complex

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ecgwaves.com/topic/ecg-normal-p-wave-qrs-complex-st-segment-t-wave-j-point

The QRS complex can be classified as net positive or net negative, referring to its net direction. The QRS complex is net positive if the sum of the positive areas (above baseline) exceeds that of the negative areas (below baseline). Refer to Figure 6, panel A. These calculations are approximated simply by eyeballing.

www.reference.com/world-view/pqrst-waves-comprised-e1cd2166b14e1543

The P wave, QRS complex and the T wave represent electrical activity in the heart on an electrocardiogram. The ECG Learning Center explains that the P wave represents the depolarization of the right and left atria. The QRS complex follows the P wave and depicts the activation of the right and left ventricles.

www.medicine-on-line.com/html/ecg/e0001en_files/05.htm

The QRS Complex. The second wave is the QRS complex. Typically this complex has a series of 3 deflections that reflect the current associated with right and left ventricular depolarization. By convention the first deflection in the complex, if it is negative, is called a Q wave. The first positive deflection in the complex is called an R wave.

www.healio.com/.../ecg-review/ecg-interpretation-tutorial/qrs-complex

For example, the normal QRS complex in lead V1 does not contain a Q wave — only a R wave and S wave — but the combination of the R wave and S wave is still referred to as the QRS complex for ...

www.merriam-webster.com/medical/QRS complex

Medical definition of QRS complex: the series of deflections in an electrocardiogram that represent electrical activity generated by ventricular depolarization prior to contraction of the ventricles.

www.practicalclinicalskills.com/ekg-lesson?coursecaseorder=8&courseid=301

The QRS complex indicates ventricular depolarization. Depolarization triggers contraction of the ventricles. Because of the larger tissue mass, the QRS complex is larger than the P wave. While the prototypical QRS complex consists of three wave components, one or two of these components may be missing.