EKG

Sinus Rhythm (SR)

Regular rhythm with a rate of 60–100 bpm that includes P-QRS-T waves.

Sinus Bradycardia (SB)

Regular rhythm with a heart rate of less than 60 bpm.

Sinus Tachycardia (ST)

Regular rhythm with a heart rate greater than 100 bpm.

Sinus Arrhythmia (SA)

Irregular rhythm with any heart rate.

Sinus Pause

A pause lasting between 0.15 to 3 seconds.

Sinus Arrest

A pause lasting 3 seconds or more.

Premature Atrial Contraction (PAC)

Early beats characterized by different types of P waves.

Wandering Atrial Pacemaker (WAP)

Atrial rhythm with a rate less than 100 bpm and different P wave morphologies.

Multifocal Atrial Tachycardia (MAT)

Atrial rhythm with a rate greater than 100 bpm and varying P waves.

Supraventricular Tachycardia (SVT)

Regular rhythm with a rate greater than 100 bpm and a buried P wave.

Atrial Tachycardia

Atrial rhythm with a heart rate of 150 bpm or higher, hard to see P wave.

Atrial Flutter

Regular rhythm with a sawtooth pattern of flutter (F) waves instead of P waves.

Atrial Fibrillation

Irregular rhythm with no true P waves and a chaotic baseline.

Premature Junctional Contraction (PJC)

Inverted or absent P wave in junctional rhythms.

Junctional Rhythm

Rate of 40–60 bpm, regular, characterized by an inverted P wave.

Accelerated Junctional Rhythm (AJ)

Junctional rhythm with a rate of 61–100 bpm.

Junctional Tachycardia (JT)

Junctional rhythm with a rate greater than 100 bpm.

Premature Ventricular Contraction (PVC)

Early wide QRS complex with an inverted T wave; can be unifocal or multifocal.

Idioventricular Rhythm (IVR)

Rate of 20–40 bpm with wide bizarre QRS complexes.

Accelerated Idioventricular Rhythm (AIVR)

Heart rate of 40–100 bpm with low amplitude QRS.

Ventricular Tachycardia (V-Tach)

Rapid heart rhythm with either monomorphic or polymorphic QRS complexes.

Ventricular Fibrillation (V-Fib)

No cardiac activity observed, with coarse or fine waves.

Asystole

Flatline indicating no electrical activity in the heart.

1st Degree Heart Block

PR interval greater than 0.20 sec but consistent throughout.

2nd Degree Type I (Wenckebach)

PR interval progressively lengthens until a QRS complex is dropped.

2nd Degree Type II (Mobitz II)

Constant PR interval with random dropped QRS complexes.

3rd Degree Heart Block

Complete heart block where atria and ventricles beat independently.

Right Bundle Branch Block (RBBB)

QRS duration greater than 0.12 sec with a bunny ear pattern.

Left Bundle Branch Block (LBBB)

Wide QRS complex that appears notched or slurred.

A-paced

Pacer spike appears before a P wave in pacing.

V-paced

Pacer spike appears before a QRS complex in pacing.

AV/Dual Paced

Pacer spikes appear before both P wave and QRS in pacing.

Bi-Ventricular Paced

Two pacemakers fire before every QRS complex in pacing.

On Demand Pacemaker

Pacer fires only when needed, such as when the heart doesn't beat.

Failure to Capture

Pacer spike occurs but is not followed by a QRS complex.

Failure to Sense

Pacer fires at inappropriate times due to failure to recognize rhythm.

Failure to Pace/Fire

Pacer does not fire when necessary.

Undersensing

Pacer does not recognize intrinsic activity and fires too late or slow.

Oversensing

Pacer is excessively sensitive and fails to fire when needed.

Failure to Fire

Pacer fails to initiate an impulse.

Failure to Capture

Pacer spike is present, but the heart does not respond.