QRs - definizione. Che cos'è QRs
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Cosa (chi) è QRs - definizione

COMBINATION OF THREE OF THE GRAPHICAL DEFLECTIONS SEEN ON A TYPICAL ELECTROCARDIOGRAM
QRS complexes; QRS; Qrs complex; QRS Complex; R-wave; J-point; R wave; Ventricular activation time; R progression; Monomorphic waveform; Q segment; Narrow QRS complexes; Poor r wave progression; Q wave (electrocardiography); QRS wave
  • Schematic representation of the QRS complex.
  • Various QRS complexes with nomenclature.
  • Diagram showing how the polarity of the QRS complex in leads I, II, and III can be used to estimate the heart's electrical axis in the frontal plane.
  • Schematic representation of a normal [[sinus rhythm]] ECG wave

QRs         
QRS complex         
The QRS complex is the combination of three of the graphical deflections seen on a typical electrocardiogram (ECG or EKG). It is usually the central and most visually obvious part of the tracing.
High frequency QRS         
High Frequency ECG; HFQRS; HyperQ; Hyper Q; High Frequency QRS
High frequency QRS (HFQRS) refers to the analysis of the high frequency spectral components of the QRS complex in an electrocardiogram (ECG). High frequency analysis of the QRS complex may be useful for detection of coronary artery disease during an exercise stress test.

Wikipedia

QRS complex

The QRS complex is the combination of three of the graphical deflections seen on a typical electrocardiogram (ECG or EKG). 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 heart and contraction of the large ventricular muscles.

In adults, the QRS complex normally lasts 80 to 100 ms; in children it may be shorter. The Q, R, and S waves occur in rapid succession, do not all appear in all leads, and reflect a single event and thus are usually considered together. A Q wave is any downward deflection immediately following the P wave. An R wave follows as an upward deflection, and the S wave is any downward deflection after the R wave. The T wave follows the S wave, and in some cases, an additional U wave follows the T wave.

To measure the QRS interval start at the end of the PR interval (or beginning of the Q wave) to the end of the S wave. Normally this interval is 0.08 to 0.10 seconds. When the duration is longer it is considered a wide QRS complex.

Esempi dal corpus di testo per QRs
1. According to the State Department charges, Boeing shipped '4 commercial jets overseas between 2000 and 2003 that carried the QRS–11 gyrochip embedded in the flight boxes.