الفهرس 
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Abstract
Atrial fibrillation represents a common complication after coronary artery bypass and valvular surgery, although it is a benign arrhythmia it may contribute to the morbidity, high cost and prolonged ICU stay.
This study was done on 277 patients underwent CABG and valvular surgery at National Heart Institute.
Medical files of the patients were reviewed, all clinical data and laboratory data were collected. Preoperative data included age, gender, history of diabetes mellitus, history of hypertension and history of smoking. Furthermore preoperative echocardiography data were reviewed e.g: ejection fraction and left atrium diameter. Intraoperative data included type of surgery, duration of bypass and cross clamping.
Postoperative data included use of inotropic agents, renal function, liver function, serum potassium and sodium level, Hb level and WBCs count, method of termination of POAF.
Our results show that age, history of hypertension and smoking and history of renal impairment were a predictor of atrial fibrillation after cardiac surgery.
Also type of surgery was an important predictor of POAF with the highest incidence observed with combined CABG and valvular surgery.
POAF developed more frequent in patients who had larger left atrium diameter and lower ejection fraction.
Our present results indicate that there is significant association between longer bypass and cross clamping time and development of POAF.
We also found that patients who had postoperative lower serum potassium experienced more frequent POAF than who had high normal potassium level.
In our study, use of adrenaline and nor adrenaline was associated with POAF while dobutamine was not a predictor of POAF.
Our findings indicated that development of postoperative atrial fibrillation was associated with higher heart failure, renal impairment and mortality rate.
DC shock and intravenous amiodarone were effective tools for termination of POAF.
We are in need for further studies to verify the relation between preoperative history of diabetes mellitus and postoperative use of dobutamine and development of POAF