医学诊断学课件：Electrocardiography.ppt

Electrocardiography(ECG)
Basic Knowledge
ECG waveforms and intervals
Measurement and Normal ECG
sec
sec
10mm/mV
P Wave in Normal ECG
P wave duration：＜ s (120 ms)
P wave amplitude：＜（limb），＜ mV（chest）
PR interval：- s
QRS Complex in Normal ECG
QRS complex duration：＜ s (- s)
Waves of QRS Complex
QRS Complex in Normal ECG
QRS pattern in leads V1,V2：rS，no q；
r＜ mV，r/S ＜ 1；
QRS pattern in leads V5, V6：qR、qRs、Rs、R； R ＜ mV, R/s＞1;
QRS Complex in Normal ECG
QRS pattern in limb leads： R (I, II), S (aVR) and r (aVR) ＜ mV;
QRS amplitude in limb leads： R(I) ＜, R(aVL) ＜ mV, R(aVF) ＜
QRS Complex in Normal ECG
QRS amplitude： limbs: QRS ＞, chest: QRS ＞；
Q Wave: ＜, ＜1/4 R
sec
sec
ST Segment in Normal ECG
ST segment:
①ST ↓＜
②ST ↑＜ (V2, V3); ST ↑ ＜ (V4～V6, limb leads)