Welch Allyn CardioPerfect Workstation Resting ECG Module - User Manual - Manual (Page 24)

CardioPerfect Workstation
Resting ECG Module - User Manual
DIR 80012333 Ver. E 24 / 54
HRV view (optional)
This tab shows the heart rate variability.
Additional information is available upon
request.
Note: HRV option not sold in the US.
The view in the workspace can be used in for example a Word document. Right-click in the
Workspace and select copy from the pop-up menu; paste the view in a document.
4.3. Parameters
The lower part of the workspace contains the Parameters pane. The Parameters pane contains
global parameters that are determined from all leads. These parameters are:
Patient age and heart rate
P and PQ duration
QRS duration
QT, QTc and QTd duration
P, QRS and T axis
4.4. QTc
The QT interval in an ECG is a good indicator of the repolarization. However, the QT depends
heavily on the heart rate. To make a useful measurement, the QT is usually corrected.
Welch Allyn CardioPerfect offers three correction methods that can be used to derive the QTc
parameter:
Bazett:
60 60
HR
QT
HR
QT
RR
QT
QTc
B
Fridericia:
3
3
3 60 60
HR
QT
HR
QT
RR
QT
QTc
F
Hodges:
) 60 ( * 75 . 1 HR QT QTc
H