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ECG 1 (ventricle AP (4 (RMP), 3 (repolarization (K out ((epicar shorter…
ECG 1
T wave
ventricular repolar
P wave
atrial depolar
duration
(0.12 sec) 3 小
amplitude
2.5 小
QRS complex
ventricular depolar
Q
left to right septal depolarization
1st downward deflection
duration
(0.12 sec) 3 小
R
depolar to apex
1st upward deflection
S
depolar to high lat wall
downward deflection after R
U wave
hypokalemia
hypercalcemia
QT interval
start of QRS - end of T
0.44s (11 小)
prolong:
RR interval
QRS
ST segment
J point - start of T
(2) plateau: isoelectric
transmural
baseline depression: ST elevation
subendocardial
baseline elevation: ST depression
PR interval
(delay 0.1s ventricular filling) start of P - start of QRS
0.20 sec (1 大)
prolong: heart block
ventricle AP
4
RMP
3
repolarization
K out
(epicar shorter AP) epi - endo
---------- ++++++
T wave
2
plateau
K out, Ca in
1
initial repolarization
K out
0
upstroke
Na in
(Purkinje endocar) endo - epi
---------- ++++++
QRS complex
calibration
duration
大 (second)
0.2
小 (second)
0.04
amplitude
小 (mV)
0.1
大 (mV)
0.5
大 (mV)
1
limb leads
6 limbs leads
4 electrodes
avF
+90
avL
-30
avR
-150
III
+120
II
+60
I
0
chest leads
6 electrodes
6 chest leads
V1
+120
V2
+90
V3
+75
V4
+60
V5
+30
V6
0
