Welch Allyn Means ECG Physicians Manual for CP Series Electrocardiographs - User Manual - Manual (Page 13)

MEANS Physicians Manual
Welch Allyn
13
2.6 Incomplete Right Bundle Branch Block (IRBBB)
For IRBBB, comparable conditions apply the same as RBBB, but QRS duration is less
increased (between 110 and 130 ms) and the intrinsicoid deflection time is shorter.
Skip tests
if:
QRS duration

130 ms
or QRS duration

110 ms
or S

amplitude in V1

100 µV
Say:
“incomplete RBBB”
if: R

amplitude

300 µV in V1 or V2
or R  in V1
and positive P wave in V1
or S duration

40 ms in I, V5, V6
and intrinsicoid deflection at

45 ms in V1 or V2
2.7 Intraventricular conduction delay (IVCD)
Only in the absence of diagnosable RBBB, LBBB or WPW will a statement of intraventricular
conduction delay be made. The delay can be classified in different grades of severity.
Say: “slight intraventricular conduction delay
if: 112 ms

QRS duration < 126 ms
Say:
“moderate intraventricular conduction delay”
if: 126 ms  QRS duration < 140 ms
Say:
“marked intraventricular conduction delay”
if: 140 ms

QRS duration < 180 ms
Say:
“very marked intraventricular conduction delay”
if: QRS duration

180 ms