ECGs Flashcards
Internodal pathway (tracts) names (3)
Anterior, middle, posterior
What is the flow of vector (positive to negative or negative to positive?
From negative to positive
Normal P wave duration
0.06-0.12 seconds
PR interval length
0.12-0.2 seconds
QRS duration
0.06-0.1 seconds
QT interval represents
Total ventricle activity (depolarization and repolarization)
How to calculate HR based on RR interval (small square method)
Count RR interval small squares (the 0.04 ones) then divide 1500 by that. That’s HR
Sinus arrest gap in atrial depolarization (how many seconds quantifies this)
Greater than 3 seconds
Sinus pause gap between atrial depolarization (how many seconds quantifies this)
Less than 3 seconds
Controlled vs uncontrolled afib
Rate over 100 is uncontrolled and under 100 is controlled
Types of pacemakers (3)
Transvenous
Transcutaneous
Epicardial
Singe vs dual chamber pacing
Number of chambers being paced (just Atria or just ventricles vs both)
When to pace epicardial?
Post operative cardiac surgery pts
When to pace transvenous
CCU patients
When to pace transcutaneous
Emergency situations (need pacing now)
Pacemaker code first letter represents
Chamber (s) that are paced, A/V/D
Pacemaker code second letter represents
What chambers pacemaker senses intrinsic heart electrical activity
A/V/D
Pacemaker code third letter represents
Measures pacemakers response to what it senses (like what it will do based on what it senses)
Triggered, inhibited, dual - T/I/D
Failure to pace meaning
No pacer spike or attempt to generate any elec impulse
Failure to capture meaning
Elec impulse and pacer spike generated, but no depolarization of myocardium following
Inappropriate sensing meaning pacing
Over or under sensing, causing more or less elec needed for result
