This page provides an overview of our free Dysrhythmia drills and courses.

What is dysrhythmia?

A cardiac dysrhythmia is an abnormal heart beat: the rhythm may be irregular in its pacing or the heart rate may be low or high. Some dysrhythmias are potentially life threatening while other dysrhythmias (such as sinus arrhythmia) and normal.

Types of Heart Dysrhythmia

Heart rate and origin (atria or ventricles) are used to help classify cardiac dysrhythmias.

  • Tachycardia is a fast (over 100 beats per minute) heart rhythm. Tachycardias can originate in the atria or ventricles.
    • Dysrhythmias that originate in the atria are termed supraventricular dysrhythmias (supraventricular means above the ventricles). These dysrhythmias include:
      • Atrial flutter
      • Atrial fibrillation
      • Paroxysmal Supraventricular tachycardia
      • Wolff-Parkinson-White syndrome
      Ventricular dysrhythmias begin in the ventricles and include:
      • Ventricular fibrillation
      • Premature ventricular contractions
      • Long QT syndrome

  • Bradycardia is a slow (under 60 beats per minute) heart rhythm.
    • Bradyarrhythmias are slow heart rhythms arising from disease in the cardiac electrical conduction system. Bradyarrhythmias include:
      • Sinus bradycardia
      • Conduction Block
      • Sick Sinus Syndrome
  • A premature Beat is an extra beat, occurring earlier than normal. Despite being an extra beat, patients may indicate feeling a skipped beat.

Introduction to Dysrhythmia Diagnosis

Electrocardiograms, stress tests, echocardiograms, holter monitors, event monitors, electrophysiology studies, head-up-tilt-table tests and cardiac catheterization can be used in testing for heart arrhythmia:. This website provides several free dysrhythmia training tools:
  • Introduction Course
  • EKG Practice Drills
  • Quizzes

Overview of Cardiac Dysrhythmia Training

A good starting point for learning cardiac arrhythmias is our EKG Basics training course. The course provides training on the key features of an EKG tracing. These features include observing P-wave forms, measurement of EKG intervals and segments, assessment of rhythm, calculating heart rate, and the evaluation of other relevant wave segments. The EKG practice drills allow students to build skills interactively.

EKG Basics

Dysrhythmia Practice Drills

The heart dysrhythmia practice drills provide a test EKG tracing and users are asked to identify the type of arrhythmia. Each answer is immediately evaluated and the correct classification of the EKG tracing is provided, along with a detailed explanation. A directory of arrhythmias is also provided.

Dysrhythmia Practice Drills

Arrhythmia Quiz

The quiz is presented like a classroom exam with 20 tracings to be evaluated. After all tracing questions are answered, your quiz is immediately graded. The graded report provides a score as well as the correct answer to each question. Top scores and mean scores are also provided. This quiz draws its questions from a library of over 300 EKGs, allowing users to take the quiz multiple times.

ECG Quiz

ECG Monitor Challenge (beta version)

The the beta version of our ECG monitor challenge. This quiz uses a simulated patient monitor with moving waveform instead of a paper tracing. As with the quiz described above, twenty questions are presented, then a graded report is available.

ECG Monitor Challenge

External References

Free Dictionary