Mindray Passport 8 Operator's Manual

8-14 Passport 12/Passport 8 Operator’s Manual
NOTE
 Only Advanced ECG algorithm has the function of automatic J point detection.
 The ISO point, J point, and ST point displayed in the [Adjust ST Point] window are positioned with reference
to the R-wave peak.
8.7 QT/QTc Interval Monitoring (For Advanced ECG Algorithm Only)
The QT interval is defined as the time between the beginning of the Q-wave and the end of the T-wave. It measures the
total duration of the depolarization (QRS duration) and repolarization (ST-T) phases of the ventricles. QT interval
monitoring can assist in the detection of long QT syndrome.
The QT interval has an inverse relationship to heart rate. As heart rate increases, the QT interval shortens, while at lower
heart rates QT interval gets longer. Several formulas are available to correct QT interval for heart rate. The heart rate
corrected QT interval is abbreviated as QTc.
QT/QTc Interval Monitoring is intended for adult, pediatric, and neonate patients.
CAUTION
 For QT interval monitoring to be effective, basic or enhanced arrhythmia monitoring should be turned on.
8.7.1 QT/QTc Monitoring Limitations
Some conditions may make it difficult to achieve reliable QT monitoring, for example:
 R-wave amplitudes are too low
 The presence of frequent ventricular ectopic beats
 Unstable RR intervals
 P-waves tending to encroach on the end of the previous T-wave at high heart rates
 T-waves are very flat or not well defined
 The end of the T-wave is difficult to delineate because of the presence of U-waves
 QTc measurements are not stable
 In the presence of noise, asystole, ventricular fibrillation, and ECG lead off
Al2
QT interval

Mindray Passport 8 Specifications

General

Brand	Mindray
Model	Passport 8
Category	Medical Equipment
Language	English