Welch Allyn Cardioperfect Workstation, PEDMEANS ECG Interpretation Module - Physicians - User Manual - Manual (Page 9)

CardioPerfect Workstation
PEDMEANS ECG Interpretation Module Physicians Manual
DIR 80015051 Rev. C 9 / 55
2 Contour analysis
2.1 Contour parameters
All parameters that are used in the diagnostic criteria of the contour classification are measured in the
representative P-QRS-T complex. The lead-independent, overall parameters are presented in Table 1.
Table 1. Lead-independent parameters for the contour classification.
Name Description
Heart rate Ventricular rate (in beats per minute, bpm)
P axis Axis of the P wave (in degrees, from –180 to 180)
P duration Duration of the P wave (in ms)
PR interval Duration of the PR interval (in ms)
QRS axis Axis of the QRS complex (in degrees, from

180 to 180)
QRS duration Duration of the QRS complex (in ms).
Corrected QT interval QT interval corrected for heart rate according to Bazett’s formula:
QTc = QT *

(HR/60) (in ms)