Phys basis for clinical intp. of ECG - Ballam Flashcards
1
Q
P wave/ atrial depolarization upright in
A
1, 2
V4-6
aVF
2
Q
P wave/ atrial DP inverted in
A
aVR
3
Q
P wave/ atrial DP variable in
A
3
aVL
4
Q
QT interval dependent on this phase
altered by
A
dependent on phase 2 plateau of myocytes altered by heart rate drugs malfuncitoning timed K+ or Ca++ gates which closed at beginning of AP and open ot terminate AP
5
Q
ischemia effect on ST and why
A
ischemia = ELEVATED ST
for electrode above ischemic region
its transmural/ epicardial
ischemic tissue remains depolarized, rest of tissue repolarizes, so electrode records a negative value
6
Q
inferior region of heart represented by
A
II, III, aVF
7
Q
septal region of heart represented by
A
V1, V2
8
Q
anterior region of heart represented by
A
V2, V3, V4
9
Q
lateral region of heart represented by
A
I, aVL, V4, V5, V6
