6 incomplete right bundle branch block (irbbb), 7 intraventricular conduction delay (ivcd) – Welch Allyn Means ECG Physicians Manual for CP Series Electrocardiographs - User Manual User Manual
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MEANS Physicians Manual
Welch Allyn
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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