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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

SYSTOLIC PREESURE IN

- RV is 20-25 mm Hg