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Dx Wisely
ECG
Chest X-ray
Blood Gases
Echocardiography
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CT Head
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ECG
Level 3
Tutorial: Bundle Branch Blocks
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Tutorial: Bundle Branch Blocks
Understand why a right bundle branch block and left bundle branch block pattern are created. Learn also the diagnostic criteria.
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Tutorial: Bundle Branch Blocks
Incomplete blocks
Lessons
42
Times Practiced
1284
Cases Completed
1h 24m
Total Time spent
1m 24s
Average Time
Progress
Accuracy
Efficiency
Accuracy
Efficiency
1
Anatomy
Anatomy
2
QRS Naming
QRS Naming
3
General Concepts
General Concepts
4
LBBB
LBBB
5
RBBB
RBBB
6
Incomplete blocks
Incomplete blocks
7
Intraventricular Delay
Intraventricular Delay
8
Advanced details
Advanced details
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Incomplete blocks
Incomplete bundle branch blocks essentially
share the same diagnostic criteria
as complete bundle branch blocks with one difference: the
QRS duration is shorter
with incomplete blocks.
Remember that the QRS duration for complete blocks is > 120 ms (3 little squares). The QRS duration diagnostic criteria for incomplete bundle branch blocks is
100 - 120 ms.
(which is 2.5 - 3 little squares).
Different textbooks might reference different QRS durations.
Here is an example of incomplete LBBB:
With close-ups of V
1
and V
6
:
Here is an example of incomplete RBBB:
With close-up looks at V
1
and V
6
:
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