الفهرس 
Ch. (1): Atrial fibrillationOnly 14 pages are availabe for public view
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Abstract
Atrial fibrillation was recognized as a major cause of morbidity soon after the introduction of CABG for the treatment of atherosclerotic CAD (Kosmidou et al., 2018).
Postoperative atrial fibrillation (POAF) is one of the most common complications after coronary artery bypass graft (CABG) surgery, with an incidence of 20%– 50% (Cerit et al., 2017).
The pathophysiological mechanisms responsible for the high incidence of AF after cardiac surgery in general and after CABG surgery in particular remain unclear (Kamal et al., 2017).
What is certain is that its incidence far exceeds its reported prevalence in the general population and in patients with atherosclerotic CAD. Similarly, it is significantly higher than the reported incidence of AF after major noncardiac surgery regardless of CAD status (Tulla et al., 2015)
Targeting patients at risk of postoperative AF with intensive prophylactic measures may drastically reduce the length of hospital stay and the associated high costs (Butt et al., 2018).
Aim of Work:
The aim of our study was evaluation of predictors of AF after coronary artery bypass surgery.
Results:
The mean age of patients was 57. The proportion of males is 84 %, The proportion of hypertensive patients was 60%, the proportion of diabetic patients was 71%, the proportion of smokers was 36%, the proportion of COPD patients was 35%, the proportion of dyslipidemic patients was 58%. The proportion of patients who had preoperative LV impaired function was
Summary
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23%, the proportion of patients with preoperative dilated LV was 26%, the proportion of patients with preoperative dilated LA was 38%, the proportion of patients who had preoperative RWMA was 51%. Regarding postoperative ECHO data, the proportion of patients who had LV impaired function was 25%, the proportion of patients with dilated LV was 20%, the proportion of patients with dilated LA was 31%, the proportion of patients who had RWMA was 61%. Regarding post-operative out comes, the proportion of patients who had stroke was 5%, the proportion of patients who had HF was 8%, the proportion of SCD was 4%.
The incidence of AF occurring post CABG operation was 40%.
At comparing the cases who had POAF and those who did not, it was found that the cases of POAF were elder, the proportion of cases with a preoperative large LA diameter was higher in POAF incidence, the proportion of cases with a preoperative renal function impairment and hepatic dysfunction were higher in POAF incidence, the proportion of cases with a intraoperative hypokalemia and metabolic acidosis were higher in POAF incidence, and also postoperative hypokalemia was higher in POAF incidence. the proportion of cases with a postoperative hypoxia and hypocapnia were higher in POAF incidence. Also cases with postoperative anemia and high total chest tubes drainage were higher in POAF incidence. Finally cases with POAF were associated with significant complication as stroke, HF and SCD.
Predictors of POAF were old age, preoperative large LA diameter, preoperative renal function impairment and hepatic dysfunction, intraoperative hypokalemia and metabolic acidosis, postoperative hypokalemia, hypoxia and hypocapnia and postoperative anemia and high total chest tubes drainage.