Asystole - EKG Reference

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Asystole EKG tracing

Key Features

Asystole EKG Reference

Asystole Lesson

Welcome to our asystole reference page that provides a definition and synopsis of EKG features. Links to our practice drills, quizzes, lessons and interactive guides can be found below.

Asystole Definition

Asystole is a cardiac arrest rhythm with no discernible electrical activity on the EKG monitor. It is a flatline EKG, P Waves and QRS complexes are not present The heart is not functioning. It is a life-threatening condition that requires immediate action.

NIH Expanded Definition

The heart has an internal electrical system that controls the rhythm of the heartbeat. Problems can cause abnormal heart rhythms, called arrhythmias. There are many types of arrhythmia. During an arrhythmia, the heart can beat too fast, too slow, or it can stop beating. Sudden cardiac arrest (SCA) occurs when the heart develops an arrhythmia that causes it to stop beating. This is different than a heart attack, where the heart usually continues to beat but blood flow to the heart is blocked.

There are many possible causes of SCA. They include coronary heart disease, physical stress, and some inherited disorders. Sometimes there is no known cause for the SCA.

Without medical attention, the person will die within a few minutes. People are less likely to die if they have early defibrillation. Defibrillation sends an electric shock to restore the heart rhythm to normal. You should give cardiopulmonary resuscitation (CPR) to a person having SCA until defibrillation can be done.

If you have had an SCA, an implantable cardiac defibrillator (ICD) reduces the chance of dying from a second SCA.

Asystole is also a condition used in certifying clinical death.

Asystole Treatment

The first step is to quickly check that the apparent asystole is not an equipment failure or a rhythm that is similar to a flat line.

Check for loose or disconnect leads. Verify that the ECG monitor has power. Check the signal gain on the ECG monitor.

Certain ventricular fibrillation tracings may appear at first to be asystole.

Treatment should follow your facility's protocols. Refer to the ACLS algorithms for more information.

ICD Codes

Relevant ICD-10 code are I46, I46.9