Sudden cardiac death: Sudden cardiac death is the sudden, abrupt loss of heart function in an individual who may or may not have diagnosed heart disease. Death occurs unexpectedly. Most cardiac arrests are due to ventricular tachycardia or ventricular fibrillation, while others are due to bradycardia. These events are called life-threatening arrhythmias and are responsible for sudden death. About half of all deaths from heart disease are sudden and unexpected, regardless of the underlying disease.
Congestive heart failure: Congestive heart failure (CHF) is a condition in which the heart cannot pump enough blood to supply the body tissues. CHF can result if the heart is pumping ineffectively for a prolonged period due to an arrhythmia. Sometimes, controlling the rate of an arrhythmia with medication or a pacemaker can lead to improved heart function. CHF can be caused by other factors such as hypertension (high blood pressure), atherosclerosis (hardening of the arteries), and certain medications.
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