Lateral infarction – Welch Allyn Means ECG Physicians Manual for CP Series Electrocardiographs - User Manual User Manual
Page 22
MEANS Physicians Manual
Welch Allyn
22
Lateral infarction
Say:
“lateral infarct”
if:
Q duration
35 ms and Q/R ratio
1/3 in V5 or V6
or
Q duration
40 ms and Q amplitude > 100 µV in V5 or V6
or
QS pattern in V5 or V6
or
R amplitude < 100 µV in V5 and V6
or
R amplitude < 150 µV in V4 and V5
and
R amplitude < 150 µV or Q wave in V6
or
R amplitude in V5 < R amplitude in V4
and
R amplitude in V5 < 150 µV
and
R amplitude in V5 > R amplitude in V6 or Q wave in V6
Say:
“probable lateral infarct”
if:
35
Q duration < 40 ms and 1/4
Q/R ratio < 1/3 in V5 or V6
or
Q duration < 35 ms and Q/R ratio
1/3 in V5 or V6
and
R amplitude in V5 < R amplitude in V4
50 µV
or
R amplitude in V6 < 150 µV
and
R amplitude in V6 < R amplitude in V5
50 µV
and
test RBBB did not pass
and
test RVH did not pass
Say:
“possible lateral infarct”
if:
25
Q duration < 35 ms and 1/4
Q/R ratio < 1/3 in V5 or V6