Physiology Of ECG Basics Flashcards
Letters at the top of the 3 peaks of an ECG
Letters in the bottom dips
P R T
Q S
Top of P wave
Halt of Atrium as depolarized and contracted
End of P wave
Entire Atrium has contracted
R wave
Ventricle depolarization
T wave
Ventricle repolarization
When does atrium repolarization happen
Masked by QRS wave only it is right before it
ST segment
Ventricles have fully depolarized and all myocytes are contracting
QT interval
Full depolarization and repolarization of ventricles
RR interval
Period between V depolarization = Measure HR
PR interval
Complete atrial depolarization and repolarization is done
Start of P point —> R wave point
PR segment
End of P wave —> Q wave
All of atrium has contracted and depolarized fully
from Q to R
Medial part of V depolarizing and atrium repolarization
S wave
The lateral part of V depolarizing and contraction
ST
When all V in contracting = iOS electric point
*should not vary much from the line before the P wave
The line right before the P wave ? Important for what in clinical setting
Should be the same level as the ST segment
T—> P segment
Entire ventricle is repolarized
Big dark lines of ECG
Small think lines on ECG
0.2sec
0.04sec
There are 5 small ones between 2 big ones
Alternative method what are the next 7 lines from one R wave for HR
300 150 100 75 60 50 43
Leads ll, lll, aVF shows
Inferior heart problem
Lead l, aVL, V5, V6 shows
Lateral Heart Problem
Lead V1 and V2 shows
Anterior Heart Problem
Lead V3 and V4 shows
Septal heart problem
Does the ECG show a SINUS, what do I look for
The P-wave especially with Lead V1 and ll
The ECG is not normal if no P wave or many P waves