Arrhythmias Basics #1 Flashcards
How to calculate
Seconds x 10 =
BPM
What do you measure for a regular rhythm?
QRS to QRS
R to R is easier (peeks)
What is the rhythm calculation?
300/# of large boxes:
If the rhythm is REGULAR:
Use the LARGE BLOCK METHOD
6 large blocks: 505 large blocks: 604 large blocks: 753 large blocks: 1002 large blocks: 1501 large block: 300
Can you use the large box method for irregular rhythms?
No, because they vary on the strip
Instead we count QRS and multiply by 6 (because the strip is 10 seconds long)
When do you use the little box method? What is it?
When the BPM is really fast
1500/# of small boxes
How many large boxes make 1 second?
5 large boxes = 1 second
What 4 things to start interpretation of EKG?
Are normal P waves present? (if normal = it comes from the sinus node (SA node). If irregular then it does not come from the SA node (because every
Are the QRS complexes narrow or wide? (0.6-1.0) Wide = 3 boxes. It tells us that there may be problems with depolarization down the HIS bundle. Narrow = normal
What is the relationship between the P waves and the QRS complexes? (tells us if there is more atrial activity then ventricular activity). Look at the ratio of # of P’s to # of QRSs.
Is the rhythm regular or irregular?
What is the the fastest sinus rhythm? What if it is more than this?
220 minus your age
IF LARER THAN THIS, IT IS NOTTTT COMING FROM THE SINUS NODE - NOT IN SINUS RHYTHM
Why are p waves harder to see in tachycardia?
P waves and T waves merge because it is so fast
When does HR increase and decreases?
Increases breathing in, decreases breathing out
How do you know you are in sinus arrest?
No P-wave happens. Meaning that the Sinus node did not fire
Which is faster, HIS bundle or atrial depolarization?
QRS = HIS bundle is faster
P-wave = slower
