### symptom | cramp | fibrillation:

Atrial fibrillation
* Some atrial fibrillation is caused by low magnesium.
* allows blood to pool in the heart, promoting clotting.
* becomes more common as one gets older, but it can occur in persons of any age.
* can cause annoying palpitations and is associated with a risk of stroke
  - fast heart rates
  - exacerbate symptoms of angina, heart failure and chronic lung disease
* common heart problem, affecting people of all ages
  - type of arrhythmia associated with a cerebral embolism
* condition in which the heart tends to beat out of rhythm.
* decreases the heart's pumping ability.
* happens when the upper chambers of the heart contract extremely rapidly.
* heart arrhythmia.
* heart rhythm disorder that makes the heart beat faster than normal
  - disturbance
* heart rhythm problem that causes rapid and irregular beating of the heart
  - which causes rapid and irregular beating of the heart
* increases a person s stroke risk by six times.
* involves the upper chambers of the heart, the atria.
* is also a risk factor for stroke.
* is an abnormality of the electrical system of the heart
  - important risk factor for stroke
* is associated with a sixfold increased risk for stroke
  - an increased susceptibility to embolic stroke
  - many types of heart and lung conditions
  - atrial arrhythmia
  - cardiac arrhythmia
  - common during thoracic surgery
  - especially worrisome
  - often a manifestation of coronary artery disease
  - one of the most common of all heart rhythm disorders
  - present about one-third of the time
* is the most common heart rhythm problem
  - supraventricular arrhythmia in the aviation population
  - frequent supraventricular arrhythmia
  - frequently occurring arrhythmia
  - rapid, uncoordinated beating of the heart's upper chambers
  - world's most common sustained heart rhythm problem
  - thought to be due to several coexisting intra-atrial reentry circuits
* is very abnormal
  - common in the elderly, but it can occur in persons of any age
* kind of irregular heart rhythm
  - tachycardia-an abnormally fast heart rhythm
* leads to further stasis and development of left atrial thrombus.
* more common indication for medications.
* occurs commonly, particularly in older people
  - more often as people age
* occurs when the atria stop beating rhythmically and begin to quiver
  - upper chambers of the heart quiver rather than beat regularly
* rapid, abnormal heart rhythm of the two upper chambers
  - erratic beating of the heart's upper chamber
* risk factor for embolic stroke.
  - arrthymia
  - irregular heart beat

### symptom | cramp | fibrillation:

Ventricular fibrillation
* can last up to five minutes.
* cause of cardiac arrest and sudden cardiac death.
* exhibits dynamical properties and self- similarity.
* is an abnormal heart rhythm , or arrhythmia
  - emergency treated as a cardiac arrest
  - chaotic irregular electrical activity within the ventricles
  - diseases
  - life-threatening but affects a relatively small percentage of people
  - rare in children but very common in older adults
* is the most common arrhythmia that causes cardiac arrest
  - frequent cause of death prior to hospital admission
  - underlying cause of a substantial proportion of heart attack deaths
* major cause of death in the industrialized world.
* medical emergency.
* occurs when different parts of the heart lose their synchrony.
  * The heart is unable to pump blood around the body properly, and ventricular fibrillation can cause tachycardia and hypoxia. Ventricular fibrillation medical emergency. If it is allowed to continue for more than a few seconds, the blood will stop circulating, which is what causes the loss of a pulse and respiration, and the person will die.
  * cause of cardiac arrest and sudden cardiac death. The ventricular muscle twitches randomly when it should contract in unison, and the ventricles cannot pump blood into the arteries and into the systemic circulation.