Welch Allyn Cardioperfect Workstation, PEDMEANS ECG Interpretation Module - Physicians - User Manual - Manual (Page 14)

CardioPerfect Workstation
PEDMEANS ECG Interpretation Module Physicians Manual
DIR 80015051 Rev. C 14 / 55
2.5 Intraventricular conduction delay
A statement of intraventricular conduction delay will only be made in the absence of RBBB, LBBB, and
WPW. Different grades of severity are distinguished.
Say: “slight intraventricular conduction delay”
if: ULN < QRS duration

ULN + 15 ms
Say:
“moderate intraventricular conduction delay”
if: ULN + 15 ms < QRS duration

ULN + 30 ms
Say:
“marked intraventricular conduction delay”
if: ULN + 30 ms < QRS duration

ULN + 60 ms
Say:
“very marked intraventricular conduction delay”
if: QRS duration > ULN + 60 ms
2.6 Atrial hypertrophy (AH)
The diagnosis of right atrial hypertrophy (RAH) or left atrial hypertrophy (LAH) is considered in the
presence of a normal P axis. Otherwise, an unusual P axis is reported.
Atrial hypertrophy results in increased amplitude and/or duration of the P waves. In RAH, or “P-
pulmonale,” a tall P wave in any lead is expected. LAH, or “P-mitrale,” produces prolongation of the P
duration, sometimes associated with notched P waves. Often the P wave in V3R, V1, or V2 is biphasic
with a negative prolonged terminal part.
For RAH, P-amplitude criteria are different for children younger and older than one month.
Say: “unusual P axis”
if: P axis
 
30
or P axis > 90
Say:
“LAH”
if: P duration > ULN
and negative P amplitude > 100 µV in 1 of V3R, V1, V2
or P notch in any lead
and no unusual P axis
Say:
“RAH”
if: positive P amplitude > 225 µV in any lead
and age > 30 days
or positive P amplitude > 300 µV in any lead
and age

30 days
and no unusual P axis