Patients who undergo Coronary Artery Bypass Graft Surgery (CABG) have an approximate 19-40% chance 
of developing atrial fibrillation (AF). AF can lead to blood clots forming causing greater in-hospital
 mortality, strokes, and longer hospital stays. While this can be prevented with drugs, it is very 
expensive and sometimes dangerous if not warranted. Ideally, several risk factors which would indicate
 an increased risk of developing AF in this population could save lives and money by indicating 
which patients need pharmacological intervention. Researchers began collecting data from CABG
 patients during their hospital stay such as demographics like age and sex, as well as heart rate,
 cholesterol, operation time, etc.. Then, the researchers recorded which patients developed AF 
during their hospital stay. Researchers now want to find those pieces of data which indicate high 
risk of AF. In the past, indicators like age, hypertension, and body surface area (BSA) have been 
good indicators, though these alone have not produced a satisfactory solution.

Fibrillation occurs when the heart muscle begins a quivering motion instead of a normal, healthy
 pumping rhythm. Fibrillation can affect the atrium (atrial fibrillation) or the ventricle 
(ventricular fibrillation); ventricular fibrillation is imminently life-threatening.

Atrial fibrillation is the quivering, chaotic motion in the upper chambers of the heart, 
known as the atria. Atrial fibrillation is often due to serious underlying medical conditions, 
and should be evaluated by a physician. It is not typically a medical emergency.

Ventricular fibrillation occurs in the ventricles (lower chambers) of the heart; it is always 
a medical emergency. If left untreated, ventricular fibrillation (VF, or V-fib) can lead 
to death within minutes. When a heart goes into V-fib, effective pumping of the blood stops.
 V-fib is considered a form of cardiac arrest, and an individual suffering from it will not 
survive unless cardiopulmonary resuscitation (CPR) and defibrillation are provided immediately.

DATA Arrhythmia
Y = Fibrillation
X1 = Age
X2 = Aortic Cross Clamp Time
X3 = Cardiopulminary Bypass Time:
        Bypass of the heart and lungs as, for example, in open heart surgery.
        Blood returning to the heart is diverted through a heart-lung 
        machine (a pump-oxygenator) before returning it to the arterial circulation. 
        The machine does the work both of the heart (pump
        blood) and the lungs (supply oxygen to red blood cells).
X4 = ICU Time	
         Intensive Care Unit
X5 = Avg Heart Rate	
X6 = Left Ventricle Ejection Fraction
X7 = Hypertension
X8 = Gender [1 -Female; 0-Male]
X9 = Diabetis
X10 = Previous MI