Flashcards in ECG Deck (18):
1
P wave
- depolarization of ATRIUM
2
QRS wave
- VENTRICULAR depolarization
-
3
T wave
- VENTRICULAR REPOLARIZATION
4
PR segment
- time from SA node to get to AV node
- time of conductance
- LONG is slow
- SHORT is fast
5
ST segment
- to know and differentiate ischemia(insufficient blood) and infarction(dead tissue)
6
QT interval
- ventricular refractoriness
- normal heart (60-100 bpm)
- interval is between 0.35-0.44 sec.
7
prolonged QT interval
- rhythm problem
- arrhythmia
8
PR interval
- AV block
- all types of block
- conduction defects
9
phase 0
- rapid inward flux of SODIUM
- POSITIVE
- VENTRICULAR DEPOLARIZATION
- QRS
10
each box
- is 200 big box msec
- 5 small box
11
partial ( 1 degree ) block
- slowed conduction through the AV node
- PR interval increased (>200 sec)
- wide
12
second degree block
mobitz I ( wenckebach)
- PR interval progressively lengthens
- drop beats no beats
13
second degree block
mobitz II
- no measurable lengthening of PR interval
14
third degree (complete heart block) block
- no synchrony in AV node and SA node
- atrium 60-100 bpm SA node
- ventricle 30-40 bpm AV node
- atria and ventricle beats independently
- beats bounce to the neck veins
- frequency of P wave>QRS complexes
- low HR is associated with lower than normal CO and syncope
- implantation of pacemaker can alleviate the problems
- ssx: bradycardia, neck vein bulging pulsation, syncope, lightheadedness, hypotension
- best initial treatment: ATROPINE by blocking vagal stimulation
15
towards the positive ends
- upward deflection
16
majority of the weight of the heart is in the
- VENTRICLES
17
thicker and heavier
- LEFT VENTRICLE
- 120 mm Hg
- pressure in the LV is what we called AFTERLOAD
18