This page provides an introduction to cardiac rhythm analysis with links to training materials on this website.
EKG waveforms are displayed on monitors or paper. These EKG tracings have important features which can be analyzed to reveal a normal or an abnormal rhythm (a dysrhythmia).
EKG can include various waveform components which are can be interpreted to understand if the EKG is a sinus rhythm or abnormal:
The P wave indicates atrial depolarization, and it is normally an upward deflection in the EKG tracing. Next the QRS complex indicates ventricle repolarization. It typically starts with a negative deflection, then a large positive movement and then a negative movement, the S wave. A T wave normally follows the QRS complex. It is typically an upwards waveform, indicating repolarization of the ventricles. Intervals such as the PR interval, PR segment, QT interval and ST segment can also be analyzed to understand the heart's condition.
A good starting point for learning cardiac rhythm analysis is our free training module. It presents a five-step analysis method for quickly learning to interpret EKG tracings.
Hundreds of heart rhythms. Tests can be tailored for specific learning needs.EKG Rhythm Tests
Step 1 - Rhythm Analysis
Step 2 - Heart Rate Regular
Step 3 - P wave Morphology (Shape)
Step 4 – PR interval (PRi)
Step 5 – QRS Complex