EKG II Flashcards
why do arrhythmias happen
Mnemonic: HIS DEBS H-Hypoxia: I-Ischemia and Irritability: S-Sympathetic stimulation: D-Drugs: E-Electrolyte Disturbances: B-Bradycardia S-Stretch:
which lead yields the most information?
II
How to calculate rate
find R wave on a bold line
300, 150, 100, 75, 60, 50 on following bold lines
rate is determined by location of next R wave in relation to the numbers above
How long in a normal PR interval?
0.12 - 0.20 s
how long is normal QRS complex?
0.04 - 0.12 s
what are the 4 types of arrythmia
- sinus origin
- ectopic
- conduction blocks
- preexcitation syndromes
how is a junctional escape rhythm denoted?
No P waves (no atrial depolarization)
what is rate of supraventricular tachycardia?
150-250
how do you slow supraventricular tachycardia?
vagus response - Baroreceptors sense changes in pressure which cause reflex response from brain to heart via vagus n. to slow HR.
how fast is the atrial rate in atrial flutter?
250 - 350
how does carotid massage effect a. flutter?
increase the block (i.e. from 2:1 to 4:1)
How fast is atrial rate in atrial fibrilation?
350 - 500
what is distinct about multifocal atrial tachycardia?
3 different P wave morphologies
irregular rate 100 - 200
carotid massage has NO effect
when is a multifocal atrial tachycardia a “wandering atrial pacemaker”?
rate < 100
what is difference between Paroxysmal atrial tachy (PAT) vs SVT?
Warm up and cool down with PAT and Carotid massage will help PSVT but not PAT
rate 100 -200
