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Pulseless electrical activity
Pulseless electrical activity or PEA (also known by the older term electromechanical dissociation) refers to a clinical diagnosis of cardiac arrest in which a heart rhythm is observed on the electrocardiogram that should be producing a pulse, but is not. Under normal circumstances, electrical activation of muscle cells precedes mechanical contraction of the heart (known as ''electromechanical coupling''). In PEA, there is electrical activity, but the heart either does not contract or there are other reasons why this results in an insufficient cardiac output to generate a pulse and supply blood to the organs.〔
While PEA is classified as a form of cardiac arrest, significant cardiac output may still be present but can only be detected in many cases by the use of advanced diagnostic technology.
Cardiopulmonary resuscitation (CPR) is the first treatment for PEA, while potential underlying causes are identified and treated. Various drugs may be administered.〔
==Signs and symptoms==
Pulseless electrical activity leads to a loss of cardiac output, and the blood supply to the brain is interrupted. As a result, PEA is usually noticed when a person loses consciousness and stops breathing spontaneously. This is confirmed by examining the airway for obstruction, observing the chest for respiratory movement, and feeling the pulse (usually at the carotid artery) for a period of 10 seconds.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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