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O que (quem) é QT interval variability - definição
QT interval variability
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QT interval variability (QTV) refers to the physiological phenomenon of beat-to-beat fluctuations in QT interval of electrocardiograms. Increased QTV appears to be a marker of arrhythmic and cardiovascular death; it may also play a role for noninvasive assessment of sympathetic nervous system activity.
QT interval
MEASURE OF THE TIME BETWEEN THE START OF THE Q WAVE AND THE END OF THE T WAVE IN THE HEART'S ELECTRICAL CYCLE
QTc; Qt interval; QTcF; QT-time; QT-interval; QTC interval; Corrected QT interval; QTc interval; Correction for heart rate; QT-Prolonging drug; QT-Prolonging drugs; QT-prolonging drugs
The QT interval is a measurement made on an electrocardiogram used to assess some of the electrical properties of the heart. It is calculated as the time from the start of the Q wave to the end of the T wave, and approximates to the time taken from when the cardiac ventricles start to contract to when they finish relaxing.
simple interval
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![Main intervals from C[[File:Intervals.mid]]](https://commons.wikimedia.org/wiki/Special:FilePath/Main intervals from C.png?width=200 "Main intervals from C[[File:Intervals.mid]]")
![natural}}).[[File:Pythagorean comma on C.mid]]](https://commons.wikimedia.org/wiki/Special:FilePath/Pythagorean comma on C.png?width=200 "natural}}).[[File:Pythagorean comma on C.mid]]")
![Simple and compound major third[[File:Simple and compound major third.mid]]](https://commons.wikimedia.org/wiki/Special:FilePath/Simple and compound major third.png?width=200 "Simple and compound major third[[File:Simple and compound major third.mid]]")
![Division of the measure/chromatic scale, followed by pitch/time-point series[[File:Time-point series.mid]]](https://commons.wikimedia.org/wiki/Special:FilePath/Time-point series.png?width=200 "Division of the measure/chromatic scale, followed by pitch/time-point series[[File:Time-point series.mid]]")
PHYSICAL QUANTITY; RATIO BETWEEN TWO SONIC FREQUENCIES, OFTEN MEASURED IN CENTS, A UNIT DERIVED FROM THE LOGARITHM OF THE FREQUENCY RATIO
Musical interval; Simple and compound intervals; Compound interval; Perfect interval; Interval strength; Melodic interval; Vertical (music); Simple interval; Musical intervals; Harmonic Interval; Harmonic interval; Interval Pairs; Intervals (music); Music intervals; Interval root; Compound intervals; Perfect intervals; Minor interval; Major interval; Imperfect interval; Twelfth (music); Interval number; Interval quality; Sixth interval; Root (interval); Ratio (music); Musical ratio; Interval name; Interval (musical); Music interval
¦ noun Music an interval of one octave or less.
