Parts of Waveforms
Misc.
Intervals
Conduction System
Name that wave!
100
Represents Atrial depolorization or contraction
What is the P Wave
100

How long, in seconds, does one small box represent?

0.04 sec.

100
Begins at the onset of the P-wave and ends at the beginning of the QRS complex
What is the PR interval
100
It is the primary pacemaker of the heart.
What is SA node
100

Normal P wave, regular R-R intervals, less than 60bpm, P-R interval less than 0.20sec, QRS no longer than 0.12 sec. Treated with Atropine.

What is Bradycardia

200
Represents Ventricular repolorization
What is the T-wave
200

What are the two ways to calculate ventricular rates? Which is more accurate for an irregular rhythm? 

number of qrs complexes x10 if a 6 second strip.

300/(number of large boxes between qrs complexes)

200
Begins at the QRS complex and ends at the end of the T-wave.
What is the QT-interval.
200
The SA node is located in this part of the heart
What is right atrium
200

The only difference between this wave and NSR is the prolonged P-R interval. Treatment not usually needed. 

1st degree heart block

300
Represents ventricular depolorization
What is the QRS complex
300

Where do you place the V1 lead?

4th intercostal space, right side of the sternum.

300
the normal duration of a PR-interval.
What is 0.12 to 0.20 seconds.
300
The intrinsic rate of the AV-junction
What is 40-60 beats per minute.
300

Represents rapid depolarization of atria from
ectopic focus (250 to 350/min); sawtooth pattern;
numerous P waves are present for each QRS; treated with medication and cardioversion.

Atrial Flutter

400

The negative waveforms after the P wave

What is the Q (and the S waves).

400

What are PVCs and name one common cause.

Premature ventricular contractions. Ectopic beat that originates in the ventricle, no p-wave.

Hypoxia, electrolyte imbalance, acid-base imbalance.

400
PR interval are composed of these two things/parts.
What is the P-wave and the PR segment
400
The right and left bundle branches recieve an impluse from this part of the conduction.
What is the bundle of His.
400

erratic quivering of ventricular
muscle mass; CO drops to zero; Start CPR and defibrillate. 

Ventricular Fibrillation

500

How does ischemia appear on an ECG?

elevated or depressed ST segment.

500

Where on the ECG do you see repolarization of the atria? 

Hidden/overshadowed by the depolarization of the ventricles.

500
These are stimulated during the PR-interval.
What is the Atria, av juction, bundle of his, right and left bundle branches and purkinje fibers.
500
The AV-junction recieves impulses from this part of the conduction system.
What is the SA node.
500

 PR interval gets progressively
longer until one does not pass on to ventricles

2nd degree type 1 heart block

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