ECG

Originate in the atria rather than in the SA node. The P wave will be positive, but its shape can be different than a normal sinus rhythm because the electrical impulse follows a different path to the AV (atrioventricular) node

Atrial Rhythm

Atrial Fibrillation (afib) Atrial Flutter Multifocal Atrial Tachycardia Premature Atrial Complex Supraventricular Tachycardia Wandering Atrial Pacemaker Wolff-Parkinson-White Syndrome

Atrial rhythms are classified as

The combination of multiple waves grouped together. The only main complex on an ECG is the QRS complex

Complex

occurs when the pacemaker does not detect the patient's myocardial depolarization. This can often be seen on an EKG tracing as a spike following a QRS complex too early

Failure to Sense

The time between two specific ECG events. The intervals commonly measured on an ECG include the PR interval, QRS interval (also called QRS duration), QT interval and RR interval

Interval

usually smooth and rounded Height 0.05 to 0.25mV (0.5 to 2.5 small boxes) Interval 0.06-0.11 seconds (1.5 to 2.75 small boxes)

Normal P wave

0.12 to 0.20 seconds (3 to 5 small boxes)

Normal P-R interval

0.36 to 0.44 seconds (9-11 boxes)

Normal Q-T interval

0.08 to 0.10 seconds

Normal QRS

There is only one point on an ECG termed the J point, which is where the QRS complex ends and the ST segment begins

Point

The length between two specific points on an ECG that are supposed to be at the baseline amplitude (not negative or positive). The segments on an ECG include the PR segment, ST segment and TP segment

Segment

Normal Sinus Rhythm Sinoatrial Block Sinus Pause Sinus Arrhythmia Sinus Bradycardia Sinus Tachycardia

Sinus rhythms are classified as

A positive or negative deflection from baseline that indicates a specific electrical event. The waves on an ECG include the P wave, Q wave, R wave, S wave, T wave and U wave

Wave

a normal heart rate and rhythm from 60 to 100 beats per minute. the heart beat's electrical impulse originates in the sinoatrial node (SA). The P waves are upright and appear before each QRS and have the same shape. The intervals between the P waves are regular although some variations can occur with respiration

normal sinus rhythm