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QRS (other)
QRS may refer to: * QRS complex * QRS concordance * QRS Music Technologies, recording and musical instrument manufacturer * QR Sagittae, star also known as WR 124 * QRS Sunderland, former name of Newcastle Eagles basketball team * Radio Q code for "slow down" (in sending Morse code Morse code is a telecommunications method which Character encoding, encodes Written language, text characters as standardized sequences of two different signal durations, called ''dots'' and ''dashes'', or ''dits'' and ''dahs''. Morse code i ...) See also * * QR (other) for the singular of QRs {{disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 ; 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. W ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
QRS Concordance
Precordial concordance, also known as QRS concordance, is a pattern in which all precordial leads on an electrocardiogram are either positive (positive concordance: all the major spikes point upwards from the baseline) or negative (negative concordance: point downwards). When there is a negative concordance, it almost always represents a life-threatening condition called ventricular tachycardia because there is no other condition that suggests any abnormal conduction from the apex of the heart to the upper parts. However, in positive concordance another rare conditions such as left side accessory pathway In cardiology, an accessory pathway is an additional electrical connection between two parts of the heart. These pathways can lead to abnormal heart rhythms ( arrhythmias) associated with symptoms of palpitations. Some pathways may activate a regi ...s or blocks are also possible. References Electrophysiology Physiology {{med-imaging-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
QRS Music Technologies
QRS Music Technologies, Inc. is an American company that makes modern player pianos. It was founded as Q•R•S Music Company in 1900 to make piano rolls, the perforated rolls of paper read by player pianos to reproduce music. The company also produced shellac records in the 1920s and 1930s and radios beginning in the 1920s. Today, it makes modern, digital variations on the player piano and the recordings to drive them. History QRS was founded in Chicago, Illinois, by Melville Clark (ca. 1850-1918), who also founded the Story & Clark Piano Company, to make piano rolls. It recorded early ragtime and jazz musicians, such as Fats Waller and James P. Johnson. In 1912, the company introduced the QRS marking piano, one of the first mechanisms for recording the performance of a live pianist to a piano roll, rather than transcribing notes by hand. The first "hand-played" roll that QRS released was "Pretty Baby" by ragtime pianist Charley Straight. The company went on to capture live ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
