Welch Allyn Means ECG Physicians Manual for CP Series Electrocardiographs - User Manual - Manual (Page 20)

MEANS Physicians Manual
Welch Allyn
20
Septal infarction
Say: “septal infarct”
if: Q duration

35 ms and Q/R ratio

1/3 in V1 or V2
or Q duration

40 ms and Q amplitude > 100 µV in V1 or V2
or QS pattern in V2
and R amplitude in V1

70 µV
or QS pattern in V3
or Q duration in V3

25 ms
or Q wave and R amplitude < 250 µV and R duration < 26 ms in V3
or R amplitude < 200 µV and R duration < 16 ms in V3
Say:
“probable septal infarct”
if: 25

Q duration < 35 ms and Q/R ratio

1/3 in V2 or V3
or 35

Q duration < 40 ms and 1/4

Q/R ratio < 1/3 in V2 or V3
or Q duration

30 ms and R amplitude

200 µV in V2
or R amplitude in V2 < 150 µV
and R amplitude in V2 < R amplitude in V1

50 µV
and R duration in V2

R duration in V1
or Q duration in V3

25 ms
Say:
“possible septal infarct”
if: 25

Q duration < 35 ms and 1/4

Q/R ratio < 1/3 in V1 or V2
or QS pattern and R amplitude < 70 µV in V1
and QS pattern in V2
and test LVH did not pass
or QS pattern or R amplitude < 70 µV in V1
and Q amplitude < S amplitude and R amplitude < S amplitude in V2
and test LVH did not pass