Atrial Enlargement (看lead V1 & II)
1. Right: P wave 高度 > 2.5 mm in lead II, 高度 > 1.5 mm in lead V1
2. Left: P wave duration > 0.12s, P wave 出現notch in lead II, biphasic P (先正再負, 負的時間 > 0.04sec且深度 > 1 mm) in lead V1
整理:
RAE會造成P的高度改變(II:2.5, V1:1.5)；
LAE是時間變長(II: notch, V1:biphasic, deep negative terminal)
Ventricular Hypertrophy
1. RVH:
(a) R > S in V1且S > R in V6,
(b) RAD
2. LVH:
(a) (S in V1 + R in V5 or V6) > 35-mm
(b) R in aVL > 11-mm
LVH久了會看到strain pattern / secondary repolarization abnormalities/ secondary ST-T changes
(a) ST-depression 在lateral leads
(b) TWI
(c) ST-elevation 在right-precordial leads