Cardiac ECG

Question 1

P wave means

Answer 1

atrial depolarization

NOT ATRIAL REPOL WHICH IS PART OF QRS

Question 2

PR interval means

Answer 2

from beginning of P wave to beginning Q wave

Question 3

PR interval means

Answer 3

initial depolarization of the ventricle

Question 4

PR depends on conduction velocity through ____

Answer 4

the AV node (inverse)

If AV node conduction decr (HEART BLOCK), PR interval increases

Question 5

PR interval increased with ____

decreased with ____

Answer 5

incr with stim of parasympathetic nervous system (decr AV node conduction)

decr with stim of sympathetic nervous system (incr AV node conduction)

Question 6

QRS complex represents ____

Answer 6

depolarization of the ventricles

Question 7

QT interval is _____

Answer 7

from beginning of Q wave to end of the T wave

Question 8

QT interval means

Answer 8

entire depolarization and repolarization of the ventricles

Question 9

ST segment

Answer 9

from S wave to begin T wave

when ventricles are depolarizaed

Question 10

____ is isoelectric

Answer 10

ST segment

Question 11

T wave represents

Answer 11

ventricular repol