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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.
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.
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.
Before cardiac arrest, the body is in a state of homeostasis. Arterial blood circulates appropriately through the body, supplying oxygen to tissues while the venous blood collects metabolic waste products to be utilized elsewhere and/or eliminated from the body. However, during cardiac arrest, the body is in circulatory and pulmonary arrest ...
In medicine, an agonal heart rhythm is a variant of asystole. Agonal heart rhythm is usually ventricular in origin. Occasional P waves and QRS complexes can be seen on the electrocardiogram. The complexes tend to be wide and bizarre in morphological appearance. [1]
Rhythmic contraction is necessary for efficient movement of blood, and fibrillation disrupts this rhythm sufficiently to cause cardiac arrest. Disorders of the myocardium. Cardiomyopathy – Cardiomyopathy is a deterioration of the myocardium. Several classifications have been used to categorize cardiomyopathies with the most common being ...
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]
In adults, cardiac arrest is usually caused by heart problems such as acute coronary syndrome. Hypoxic/asphyxial cardiac arrest is a result of progressive respiratory failure and/or shock. For this reason, it is important to treat respiratory failure and shock early so that they don't progress to cardiac arrest.
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