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In 20% of cases, no cause of death can be found, even after extensive examination. [13] Sudden arrhythmic death syndrome in alcohol abuse is a significant cause of death among heavy drinkers, characterized by older age and severe liver damage, highlighting the need for family screening for heritable channelopathies. [4]
Long QT syndrome (LQTS) is a condition affecting repolarization (relaxing) of the heart after a heartbeat, giving rise to an abnormally lengthy QT interval. [7] It results in an increased risk of an irregular heartbeat which can result in fainting, drowning, seizures, or sudden death. [1]
Reduced body temperature, or therapeutic hypothermia, during clinical death slows the rate of injury accumulation, and extends the time period during which clinical death can be survived. The decrease in the rate of injury can be approximated by the Q 10 rule, which states that the rate of biochemical reactions decreases by a factor of two for ...
Preventing Cardiovascular Disease. The development of cardiovascular disease is strongly associated with your lifestyle habits. You can minimize your chances of developing cardiovascular disease by:
The rarity of short QT syndrome makes calculating prognosis accurately difficult. The risk of sudden cardiac death has been estimated at 0.8% per year, [2] leading to a cumulative risk of sudden cardiac death of 41% by the age of 40. [1] A previous history of cardiac arrest predicts a higher likelihood of further dangerous arrhythmias. [1]
The overall rate of survival among those who have OHCA is 10%. [135] [136] Among those who have an OHCA, 70% occur at home, and their survival rate is 6%. [137] [138] For those who have an in-hospital cardiac arrest (IHCA), the survival rate one year from at least the occurrence of cardiac arrest is estimated to be 13%. [139]
Monomorphic ventricular tachycardia means that the appearance of all the beats match each other in each lead of a surface electrocardiogram (ECG). Scar-related monomorphic ventricular tachycardia is the most common type and a frequent cause of death in patients having survived a heart attack, especially if they have weak heart muscle. [12]
Electrocardiography is the process of producing an electrocardiogram (ECG or EKG [a]), a recording of the heart's electrical activity through repeated cardiac cycles. [4] It is an electrogram of the heart which is a graph of voltage versus time of the electrical activity of the heart [ 5 ] using electrodes placed on the skin.