ECG Terminology and Interpretation Flashcards

What is the P wave

point of ECG immediately preceding atrial contraction

what is the QRS complex

point of ECG that immediately precedes ventricular contraction

what is the T wave

ventricular repolarization and relaxation (diastole)

true or false: in an ECG, you can see atrial repolarization

false! it is hidden by the QRS complex

what is the PR interval

- from the start of the P wave to the QRS complex

- time it takes for signal to travel from SA node to ventricles

what is the ST segment

flat line "isoelectric"

what is a normal time for the PR interval

0.16 seconds (4 small boxes)

what does a delay in the PR wave indicate

conduction delay (from SA node to Purkinje fibers)

how much time are in the larger boxes

0.2 seconds

how much time is in one small box

0.04 seconds

how can you calculate heart rate using the RR interval

counting the number of R waves in a 6 second strip and multiplying by 10