ECG Rhythm Strip Interpretation

stroke volume definition

volume of blood pumped out of ventricles in a single contraction

stroke volume range

60-130 mL

Cardiac Output definition

amount of blood pumped by the left ventricle in one minute

CO normal

4-8 L/min

Preload definition

volume and stretch of ventricular muscle at the end of diastole

pulmonary vein brings ___ blood

oxygenated

pulmonary artery brings _____ blood

deoxygenated

SA Node intrinsic rate

60-100

Internodal pathways

4 paths, from SA to AV

AV node intrinsic rate

40-60

Bundle of His purpose

important for rhythm, divides into right and left bundle branches

Purkinje Fibers intrinsic rate

20-40

Automaticity

allows the heart tissue to initiate an impulse

Rhythmicity

allows impulses to form at regular intervals without outside stimulus

Conductivity

once an impulse is initiated, allows it to travel through myocardium

Contractility

ability of cardiac cells to shorten and contract

Excitability

ability to respond to an outside stimulus

P wave

SA node impulse and atrial depolarization

PR interval

represents delay at AV node

QRS complex

bundle of His and Purkinje fibers impulse and ventricular depolarization

ST segment

end of ventricular depolarization/beginning of repolarization

T wave

ventricular repolarization

Isoelectric line

normal flat line between beats

Normal PR interval

0.12 to 0.2

Normal QRS wave

0.04 to 0.1

Normal QT interval

0.36 to 0.44

Normal Sinus Rhythm

Sinus Brady

Sinus Tachycardia

A-Paced 100% capture Pacemaker

Dual Pace 100% capture Pacemaker

V paced with failure to capture

Atrial Flutter

A Fib

Supra-ventricular Tachycardia (SVT)

V Tach

V Fib

First Degree Heart Block

Second Degree heart block type 1 (Wenkebach)

Bundle Branch Block (BBB)

Premature Atrial Contraction (PAC)

Premature Ventricular Contractions (PVC)

Sinus rhythm with unifocal bigeminy

Sinus rhythm with unifocal trigeminy

Sinud rhythm with 8 beat run of vtach

Asystole traetment

epinephrine and CPR

Treatment of V Fib

defibrilate

treatment of v tach

check patient, then check pulse