ECG Flashcards
(18 cards)
1
Q
P wave
A
- depolarization of ATRIUM
2
Q
QRS wave
A
- VENTRICULAR depolarization
-
3
Q
T wave
A
- VENTRICULAR REPOLARIZATION
4
Q
PR segment
A
- time from SA node to get to AV node
- time of conductance
- LONG is slow
- SHORT is fast
5
Q
ST segment
A
- to know and differentiate ischemia(insufficient blood) and infarction(dead tissue)
6
Q
QT interval
A
- ventricular refractoriness
- normal heart (60-100 bpm)
- interval is between 0.35-0.44 sec.
7
Q
prolonged QT interval
A
- rhythm problem
- arrhythmia
8
Q
PR interval
A
- AV block
- all types of block
- conduction defects
9
Q
phase 0
A
- rapid inward flux of SODIUM
- POSITIVE
- VENTRICULAR DEPOLARIZATION
- QRS
10
Q
each box
A
- is 200 big box msec
- 5 small box
11
Q
partial ( 1 degree ) block
A
- slowed conduction through the AV node
- PR interval increased (>200 sec)
- wide
12
Q
second degree block mobitz I ( wenckebach)
A
- PR interval progressively lengthens
- drop beats no beats
13
Q
second degree block
mobitz II
A
- no measurable lengthening of PR interval
14
Q
third degree (complete heart block) block
A
- 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
Q
towards the positive ends
A
- upward deflection
16
Q
majority of the weight of the heart is in the
A
- VENTRICLES
17
Q
thicker and heavier
A
- LEFT VENTRICLE
- 120 mm Hg
- pressure in the LV is what we called AFTERLOAD
18
Q
SYSTOLIC PREESURE IN
A
- RV is 20-25 mm Hg
