QTc Formula This setting lets you change the correction formula used to correct the measured QT
interval for the patients heart rate.
The QT interval has an inverse relationship to heart rate. Faster heart rates shorten the QT interval and
slower heart rates prolong the QT interval. Researchers have generated correction formulas to normalize
the effects of heart rate. Heart rate corrected QT interval is abbreviated as "QTc".
Several commonly used heart rate correction formulas are available. In clinical practice, the most
commonly used formula is the Bazett formula. The setting QTc Formula let you configure either the
Bazett or Fridericia formula. The differences are shown here:
For more detail about the QT/QTc measurement and correction formulas, refer to the IntelliVue
Instructions for Use, as well as the Application Note "QT/QTc Interval Monitoring". Both documents are
available on the IntelliVue Documentation DVD.
Configuring Capture 12 Lead
Measurement Settings: Main Setup -> Capture 12 Lead -> Capture Waves
Rhythm Lead 1
Rhythm Lead 2
Rhythm Lead 3
Capture 12 Lead Configuration Implications
Filter This setting lets you select the wave filtering for both the application window and the printout.
In realtime mode, it lets you control the filtering for all ECG waves in the ECG measurement. Choices are
0.05-150Hz D (Diag), 0.5-150Hz eM (Ext. Monitor), 0.5-40Hz M (Monitor) (or 0.5-55Hz
M for pediatric and neonatal patient categories), and 0.5-20Hz F (Filter).
QTc = QT / (RR)1/2
QTc = QT / (RR)1/3
MP2 - MP90
C M Profile Adult
x 0.05-150Hz D
x 10 mm/mV
x 25 mm/sec
x 3x4 1R
4 Configuration Settings Appendix