Welch Allyn Means ECG Physicians Manual for CP Series Electrocardiographs - User Manual - Manual (Page 10)

MEANS Physicians Manual
Welch Allyn
10
2.2 Dextrocardia and arm electrodes reversal
Skip tests
if:
QRS area in I > 0
or top-top QRS amplitude in I

150 µV
or positive T wave in I
or

100

P axis

100

Say:
“dextrocardia”
if: top-top QRS amplitude in V6

500 µV
Say:
“arm electrodes interchanged”
if: top-top QRS amplitude in V6 > 500 µV
If either test passed, no further contour analysis is performed.
2.3 Wolf-Parkinson-White syndrome (WPW)
The presence of delta waves is a necessary condition for the diagnosis of WPW. The length
of the PR interval is another obvious parameter to use. However, it is not a necessary
criterion, for if the accessory pathway is slowly conducting, the PR interval could be normal.
Moreover, WPW can occur in the absence of P waves, for example in the presence of atrial
fibrillation. For this reason this criterion has not been used to construct the diagnosis of WPW,
but has only to distinguish between LBBB and WPW type B in case both diagnoses have
been made (see section LBBB).
Say: “WPW”
if: delta waves in at least 2 extremity leads
and delta waves in at least 2 precordial leads
and QRS duration > 100 ms
If test WPW passed, only a test for LBBB is performed.