The heart rhythms with no pulse are Asystole (a flatline with no electrical or mechanical activity) and Pulseless Electrical Activity (PEA), where there's electrical activity but the heart isn't pumping blood effectively to create a pulse. Pulseless Ventricular Tachycardia (pVT) also lacks a pulse, as does Ventricular Fibrillation (VF), which is often the precursor to asystole or PEA, resulting in ineffective quivering rather than pumping.
Pulseless electrical activity (PEA) is a common initial rhythm in cardiac arrest. A substantial number of PEA arrests are caused by coronary ischemia in the setting of acute coronary occlusion, but the underlying mechanism is not well understood.
Pulseless electrical activity can present as any organized or partially organized rhythm on an electrocardiogram (ECG). Examples include sinus rhythm, atrial fibrillation, bundle branch blocks, or idioventricular rhythms (a rhythm where you would expect and pulse and there is none).
True PEA: This is PEA where your heart has electrical activity, but your heart muscle isn't reacting to it. That means blood isn't moving at all and you don't have a pulse.
Pulseless electrical activity (PEA) is a form of cardiac arrest in which the electrocardiogram shows a heart rhythm that should produce a pulse, but does not. Pulseless electrical activity is found initially in about 20% of out-of-hospital cardiac arrests and about 50% of in-hospital cardiac arrests.
During ventricular fibrillation, the heart doesn't produce a coordinated rhythm or a detectable pulse. Instead, the heart's lower chambers quiver quickly. On an electrocardiogram (EKG), VF can appear as a heart rate of 200-300 beats per minute, far faster than the normal 60-100 beats per minute of a healthy heart.
Asystole Overview
Asystole, informally referred to as "flatline," signifies a complete cessation of the heart's electrical and mechanical activity. [1] The condition frequently begins as a nonperfusing ventricular dysrhythmia, specifically ventricular fibrillation or pulseless ventricular tachycardia (pVT).
On the other hand, a weak or absent pulse can indicate cardiovascular insufficiency or local arterial stenosis.
Pulseless ventricular tachycardia is a life-threatening cardiac arrhythmia in which coordinated ventricular contractions are replaced by very rapid but ineffective contractions, leading to insufficient organ perfusion and heart failure. Pulseless ventricular tachycardia is a medical emergency.
From a biological perspective, cardiac arrest is synonymous with death by cardiorespiratory criteria, which is declared based on the absence of heartbeat and respiration and the loss of brain function. Deprived of blood flow and oxygen, the cells of the body begin their own process of death.
PEA, pulseless electrical activity is defined as any organized rhythm without a palpable pulse and is the most common rhythm present after defibrillation.
This video will provide important information on the following lethal arrhythmias: Ventricular Tachycardia, Ventricular Fibrillation, Asystole, and Pulseless Electrical Activity.
Silent AFib occurs when the heart beats irregularly without causing noticeable symptoms, such as fluttering, fatigue, or shortness of breath. Because it doesn't cause discomfort or obvious warning signs, silent AFib often goes undetected until a routine exam, smartwatch alert, or heart-related event like a stroke.
A palpitation — a skipped, extra or irregular heartbeat — is a type of abnormal heart rhythm, or arrhythmia. It occurs when an electrical signal fires from the wrong place at the wrong time, causing the heart to beat out of rhythm.
Shockable rhythms
Pulseless electrical activity (PEA), is classified as a form of cardiac arrest. The electrocardiogram (ECG) interpretation displays heart rhythm activity with similarities to a normal sinus rhythm, but the patient has no palpable pulse.
In pulseless ventricular tachycardia, the heart contracts too fast (tachycardia). This prevents the ventricles from filling with blood and stops blood flow to the body. Without blood flow, a person has no pulse. This lack of blood flow can quickly lead to organ failure, heart failure and sudden cardiac arrest.
Symptoms of SVT include palpitations, weakness, fatigue, dizziness, syncope, and chest pain, and can often be misdiagnosed as a panic attack.
Types of Arrhythmias
Pulseless electrical activity (PEA), also known as electromechanical dissociation, happens when a person shows no response and has no detectable pulse, despite the heart's electrical system functioning adequately.
Bradycardia (brad-e-KAHR-dee-uh) is a slow heart rate. The hearts of adults at rest usually beat between 60 and 100 times a minute. If you have bradycardia, your heart beats fewer than 60 times a minute.
PEA is an organized electric rhythm that is characterized by an absence or insufficient mechanical ventricular activity to produce a detectable pulse. Asystole is an absence of ventricular electrical activity with or without atrial electric activity.
Without quick action to revive the heart, a person can die in minutes. But delivering an electric shock to restore a normal heartbeat as soon as possible and giving CPR can be lifesaving.
PEA is one of many waveforms by ECG (including sinus rhythm) without a detectable pulse. PEA may include any pulseless waveform with the exception of VF, VT, or asystole (Figure 27) . Hypovolemia and hypoxia are the two most common causes of PEA.
It almost always refers to either a flatlined electrocardiogram, where the heart shows no electrical activity (asystole), or to a flat electroencephalogram, in which the brain shows no electrical activity (brain death). Both of these specific cases are involved in various definitions of death.