BeneVision N1 Patient Monitor Operator’s Manual
8 - 21
If the heart rate is extremely high (over 150bpm for adults and over 180bpm for pediatrics and neonates), QT will
not be measured. When the heart rate changes, it can take several minutes for the QT interval to stabilize. For
reliable QTc calculation it is important to avoid measurements when the heart rate is changing.
8.9.2
Enabling QT/QTc Monitoring
The QT monitoring function is disabled by default. Before you start QT monitoring, enable the QT function. To do
so, follow this procedure:
1.
Select the ECG numeric area or waveform area to enter the
ECG
menu.
2.
Select the
QT
tab
→
select the
Setup
tab.
3.
Switch on
QT Analysis
.
8.9.3
Displaying QT/QTc Numerics and Segments
To display QT/QTc numerics and Segments, follow this procedure:
1.
Access
Tile Layout
by either of the following ways:
◆
Select the
Screen Setup
quick key
→
select the
Tile Layout
tab.
◆
Select
Main Menu
quick key
→
from the
Display
column select
Tile Layout
.
2.
Click the parameter numeric area where you want to display the QT numerics, and then select
ECG
→
QT/
QTc
.
NOTE
•
QTc values are calculated based on the QT-HR, not the ECG HR. To view the QT-HR, open the QT View
window. For more information, see
.
The following picture shows the QT numeric area. Your monitor screen may look slightly different:
NOTE
•
The display of the QT numeric area differs as related settings change.
8.9.4
Entering
the
QT View
QT View shows the current and baseline QT parameter values and waveforms. To enter the QT View, follow this
procedure:
1.
Select the QT numeric area, ECG numeric area or ECG waveform area to enter the
ECG
menu.
2.
Select the
QT
tab.
3.
From the bottom of the menu, select
QT View
.
(1) QTc alarm limit (if QTc alarm is off, the alarm off symbol is displayed)
(2) Parameter label
(3) QTc value
(4)
∆
QTc value (the difference between the current and baseline QTc values)
(5) QT value
(4)
(2)
(1
)
(5)
(3)
