Objective To observe and analyze the morbidity and risk factors of postoperative delirium in the patients un-dergoing cardiac surgery.Methods From March 2017 to March 2018, 478 patients who need cardiac surgery were selected from our hospital.According to the postoperative results evaluated with Confusion Assessment Method(CAM), they were divid-ed into delirium group(54 patients)and control group(424 patients).Morbidity and risk factors of postoperative delirium were analyzed.Results Delirium occurred in 54 patients of 478 patients and morbidity of postoperative delirium was 11.3％.Psy-chomotor excitement is the most common clinical presentations , followed by attention impairment and a reduced level of con-sciousnes.Single factor analysis result showed that delirium was associated with advanced age (≥65 years) , hypertension, pre-vious cerebral vascular event(previous cerebral infarction, previous brain heamorhage), intraoperative blood loss, mechanical ventilation time, intensive care unit duration time.The multiple-logistic regression analysis indicated that the perioperative risk factors of delirium included advanced age, cerebrovascular accident history and ICU duration time.Conclusion The patients with advanced age, hypertension, previous cerebral vascular event(previous cerebral infarction, previous brain heamorhage) are the high risk groups for delirium after cardiac surgery.Advanced age, hypertension, previous cerebral vascular event(previ-ous cerebral infarction, previous brain heamorhage) are risk factors for delirium in patients undergoing cardiac surgery.

Radiofrequency ablation concomitant with open-heart procedures is one of the most common surgical methods to treat organic heart disease complicated with atrial fibrillation .However, the recurrence of atrial fibrillation still bothers both doctors and patients.There are different views on the main factors influencing the long-term effects of sinus rhythm maintenance after ablation.We reviewed past related clinical observations and researches to summarize the factors influencing recurrence of long-term atrial fibrillation after radiofrequency ablation concomitant with open-heart procedures.

Objective To investigate the risk factors of new-onset postoperative atrial fibrillation in the elderly patients undergoing off-pump coronary artery bypass grafting. Methods A total of 156 patients who need selective off-pump coronary artery bypass grafting in the First Affiliated Hospital of Zhengzhou University from June 2017 to June 2018 were selected. According to the occurrence of new-onset postoperative atrial fibrillation, the patients were divided into the AF group (37 cases) and the non-AF group (119 cases). The perioperative clinical data of the two groups were statistically analyzed to study the risk factors of postoperative atrial fibrillation. Results In the whole group, 37 cases ( 23. 7％) had postoperative atrial fibrillation. Univariate analysis showed that history of diabetes mellitus(OR=1. 726, P=0. 037), preoperative left atrial diameter (LAD)≥38mm(OR= 2. 632, P=0. 001) and mechanical ventilation time(OR=1. 692, P<0. 018) were correlated with new-onset postoperative atrial fibrillation in elderly patients after off-pump coronary artery bypass grafting. Logistic multivariate regression analysis showed that it is an independent risk factor for new-onset postoperative atrial fibrillation that elderly patients with history of diabetes mellitus, preoperative left atrial diameter (LAD)≥38mm and mechanical ventilation time after off-pump coronary artery bypass grafting. Conclusions Preoperative left atrial diameter (LAD)≥38mm, history of diabetes and prolonged mechanical ventilation are risk factors for new-onset postoperative atrial fibrillation in elderly patients undergoing off-pump coronary artery bypass grafting.