ECG Flashcards
What are the following rhythms?
Nonsinus P but PR > or = 0.12
Vs
Nonsinus P but PR < 0.12
Ectopic atrial rhythm vs junctional or low atrial rhythm
What is sinus arrhythmia?
Narrow QRS, sinus P but irregular R-R with P-P varying > 0.16 seconds
What tachycardias have short RP (R-P < 50% R-R interval)
AVNRT, orthodromic SVT, atach with 1degree AV block
Rhythms with long R-P (R-P > 50% R-R interval)
A tach, sinus node reentrant tach
Definition of short QT
<0.35 seconds
What value indicates a tall T wave?
Amplitude:
> or = 6mm in limb leads
> 10mm in precordial leads
PPM are described with using four letters. What do they represent?
First letter = chambers pace
Second letter = chambers sensed
Third letter = mode (inhibit, triggered, dual) inhibit is like it gets inhibited when senses a QRS, dual will sense atrial activity -> inhibit atrial output and trigger ventricular output after a designated AV interval.
Fourth letter = rate responsiveness (can vary rate when sensing motion/alteration in temp like when exercising)
PPM oversensing, what do you see on ECG?
Paced beat comes in later than expected because sensing something it shouldn’t. Paced beat after QRS at an interval > V-V interval.
Note: undersensing is the opposite
What is the diagnosis?:
PR depression with reciprocal elevation in opposite lead.
-what other EKG finding is usually evident?
This is an atrial infarction.
Usually also see an inferior MI
DDx for prominent R wave in V1:
- RVH
- Posterior MI
- Incorrect lead placement
- Pectus excavatum
- RBBB
- WPW
- Duchenne’s muscular dystrophy
What MI is associated with a LAD vs RAD?
LAD a/w inferior MI
RAD a/w lateral wall MI
Which ASD has RAD on ECG?
Ostium Secundum ASD
DDx for reverse R wave progression (decreasing R wave amplitude across precordial leads)?
Anterior MI or Dexteocardia
