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Asystole is the most serious form of cardiac arrest and is usually irreversible. Also referred to as cardiac flatline , asystole is the state of total cessation of electrical activity from the heart , which means no tissue contraction from the heart muscle and therefore no blood flow to the rest of the body.
Cardiac arrest (also known as sudden cardiac arrest [SCA] [11]) is when the heart suddenly and unexpectedly stops beating. [ 12 ] [ 1 ] When the heart stops beating, blood cannot properly circulate around the body and the blood flow to the brain and other organs is decreased.
The Van 't Hoff equation allows calculation that oxygen consumption will drop by 50% for every 10 °C reduction in temperature. This Q 10 effect combined with a chemical cardiac arrest can reduce myocardial oxygen consumption (MVO 2) by 97%. [7] Cold cardioplegia is given into the heart through the aortic root.
Transcutaneous pacing is no longer indicated for the treatment of asystole (cardiac arrest associated with a "flat line" on the ECG), with the possible exception of witnessed asystole (as in the case of bifascicular block that progresses to complete heart block without an escape rhythm). [4]
In contrast, asystole is desired and induced during cardiopulmonary bypass through a cardioplegia solution containing very high amounts of potassium. One additional example is the use of high potassium in lethal injection that results in asystole, cardiac arrest, and then death. Pulseless electrical activity (PEA) – Pulseless electrical ...
A cardiac flatline is also called asystole. It can possibly be generated by malfunction of the electrocardiography device, but it is recommended to first rule out true asystole because of the emergence of such condition. Definition: A cardiac flatline is referred to as asystole. It can be identified by using an ECG/EKG (electrocardiogram) test.
With the advent of these strategies, cardiac arrest came to be called clinical death rather than simply death, to reflect the possibility of post-arrest resuscitation. At the onset of clinical death, consciousness is lost within several seconds, and in dogs, measurable brain activity has been measured to stop within 20 to 40 seconds. [ 2 ]
Non-respiratory causes of sinus arrhythmia include sinus pause, sinus arrest, and sinoatrial exit block. Sinus pause and arrest involve slowing or arresting of automatic impulse generation from the sinus node. This can lead to asystole or cardiac arrest if ventricular escape rhythms do not create backup sources of cardiac action potentials. [2]