Objective To describe the preoperative factors of prolonged intensive care unit length of stay after coronary artery bypass grafting. Methods From 1997 to 2009, 1318 patients underwent isolated CABG in our hospital. Retrospective analysis was performed on these cases. Univariate and multivariate analyses for preoperative risk factors were performed. Prolonged length of ICU stay was defined as initial admission to ICU exceeding 72 h. Results The mean age of patients ( 322women and 996 men) was (67.4±9.4) years. Of 1318 patients undergoing isolated CABG from 1997 to 2009, 205 experienced prolonged length of ICU stay. The length of ICU stay was (40.1 ± 22.5 ) hours and ( 122.6 ± 48.7 ) hours separately.Overall in-hospital mortality was higher among these 205 patients ( 13.7% vs. 1.2%, P ＜0.05 ). The overall mortality was 3.1%. In univariate analyses, there were statistically significant differences with respect to the percentage of CPB, total bypass time, cross-clamp time, number of distal anastomoses, use of pressor agent, use of intro-aortic balloon pump,time of ventilation and hospital mortality. The significant risk factors were age, NYHA class Ⅲ/Ⅳ, left ventricular ejection fraction(LVEF) ＜0.40, renal failure, cerebrovascular and/or peripheral vascular disease, chronic obstructive pulmonary disease, recent acute myocardial infarction, prior percutaneous coronary intervention, left main stenosi, three-vessels disease. The variables entered into the multivariate logistic regression were age, NYHA class Ⅲ/Ⅳ, LVEF ＜0.40, renal failure, chronic obstructive pulmonary disease, recent acute myocardial infarction, prior percutaneous coronary intervention, three-vessels disease. According to the outcome of multivariate logistic regression, we can conclude the model of probability forecast and create a new variable named Pre. The area under ROC curve of the new variable Pre was larger than other variables. Conclusion The main risk factors of prolonged ICU length of stay were LVEF ＜ 0.40, recent acute myocardial infarction, renal failure and chronic obstructive pulmorary disease. The AUC of variable Pre was higher than other' s , which indicated that new variable Pre combining each variable was more valuable than single variable with respect to prediction. A predicted probability of 0. 754 was used as cut-off point for the prognostic test.

Objective To analyse the clinical features and outcomes of myocardial bridge treated by coronary artery bypass grafting (CABG). Methods The hospitalization and follow-up data of patients with myocardial bridge treated between March 1999 and March 2009 were collected. The symptoms, examinations, diagnosis, treatment and follow-up findings were retrospectively analysed, the clinical features and outcomes were analysed, and discussion was performed after literature review. Results Twenty-six patients with myocardial bridge were hospitalized, all of whom were confirmed by coronary angiography. All patients experienced symptoms of myocardial ischemia such as angina, which could not be relieved by medication. Electrocardiography was characterized by depressed ST, flat or inversed T wave. All patients received CABG (off-pump operation in 15 patients and on-pump operation in 11 patients). No surgery-related death or complications occurred. Patients were followed up for (3.5 ±2.0) years, and symptom of myocardial ischemia was relieved in all. Angina took place in 5 patients, and was eased by medication. Electrocardiographic reexaminations revealed that ST was normal in 22 patients, and flat ST was improved in the other 4 patients after operation. Conclusion Myocardial bridge is one of the congenital coronary artery malformations, and was mainly diagnosed through coronary arteriography examination. CABG is one of the best choices for the treatment of myocardial bridge with severe myocardial ischemia. Angina after operation in some patients may be related to the vascular spasm, as well as the blood flow competition between own vessels and grafts.

Objective To investigate the feasibility of aortic and mitral valves replacement under video-assisted thoracoscope.Methods The subjects included 16 dogs(Experimental Group) and a clinical volunteer(Clinical Group).The procedure was performed under extracorporeal circulation with femoral artery and vein intubation.An incision 4~5 cm in length and two 1.5 cm ports were made in the right chest wall.The superior and inferior vena cava were cross-clamped by a self-made clamp and the myocardium was protected by cold cardioplegic coronary perfusion.Artificial mechanical aortic and mitral valves were intermittently sutured.Results In the Experimental Group: the time of extracorporeal circulation was 104~196 min(143.2?46.5 min) and the ascending aorta cross-clamped time was 58~128 min(82.4?26.1 min).Autopsy findings showed satisfactory valve suture fixation,without thread loosing or paravalvular rupture.In the Clinical Group: the time of extracorporeal circulation was 157 min,the ascending aorta cross-clamped time was 112 min,the time of mechanical ventilation was 10 h,and the drainage volume,150 ml.The patient was discharged from hospital on the 10 postoperative day.Follow-up observations for 9 months found no paravalvular leakage or other complications.Echocardiography showed normal prosthetic valve movement.Conclusions Video-assisted thoracoscopic aortic and mitral valves replacement is technically feasible.

Objective To assess the diagnostic value of apparent diffusion coefficient (ADC) in the classification of solid nodules of brain parenchymal tuberculosis and response evaluation of patients.Methods Brain parenchymal lesions of 128 patients,with clinically and (or) pathologically confirmed brain parenchymal tuberculosis were analyzed retrospectively.Results Significant differences were observed in the average ADC values between enhanced areas and edematous areas of homogeneously enhancing and ring-enhancing lesions in all 128 patients before treatment(P<0.05).In 52 patients, the average ADC values of enhanced areas and edema areas in homogeneously enhancing and ring-enhancing lesions were significantly different before and after the treatment(P<0.05).Conclusion The ADC values in different areas of solid nodules of brain parenchymal tuberculosis are different, so can be used as a supplement to magnetic resonance imaging diagnosis and classification.After anti-tuberculosis treatment, the ADC values can be used as an observational indicator in follow-up.

Objective To explore the value of time-invariant CTA in assessing collateral circulation of patients with acute ischemic stroke and assisting clinicians in predicting clinical outcomes.Methods The score of collateral circulation was compared between single-phase and time-invariant CTA.NIHSS score was calculated at admission and two weeks after admission.A 50% or greater decrease in NIHSS score over two weeks was considered as major neurologic improvement,which showed good clinical outcome;otherwise,it indicated bad outcome.The predictive ability of time-invariant CTA for clinical outcomes was assessed based on ROC curves.Results Compared with single-phase CTA,more collateral vessels could be viewed on time-invariant CTA.The average score of collateral circulation on time-invariant and single-phase CTA was 1.50±0.69 and 1.15±0.49 respectively (P=0.006<0.05 ).Time-invariant CTA had the moderate predictive ability for clinical outcomes in patients with acute ischemic stroke (AUC=0.810;P=0.032<0.05). Conclusion The time-invariant CTA showed potential value in assessing collateral circulation of patients with acute ischemic stroke and assisting clinicians in predicting clinical outcomes.

Objective To review the experience of perioperative management and effect of coronary artery bypass grafting (CABG) for patients of aged＞80 years.Methods We studied 118 cases with CABG for patients of age＞80 years from January 2002 to December 2012.The other 1034 cases with CABG for patients aged 60-80 years were enrolled as control group.Logistic regression analysis was used to assess the effect of age on operative mortality and morbidity.Results The recent mortality was higher in group aged＞80 years [6.8％(8 cases) vs.3.1％(32 cases)].Through multivariate logistic regression,the patients aged＞80 years versus control were concerned about some postoperative adverse events as follows:higher mortality (OR =3.45,95 ％ CI:2.86-4.23),dialysis (OR=3.56,95％CI:3.01-4.32) and re-intubation(OR=3.87,95％CI:3.45-4.87),delayed healing of incision(OR=4.05,95 ％ CI:3.47 5.74),prolonged mechanical ventilation(OR=3.76,95 ％ CI:3.435.01),prolonged ICU stay (OR =2.98,95 ％ CI:2.67 4.12),prolonged hospital stay (OR =2.87,95％CI:2.36-3.96).Conclusions Age＞80 years is an important factor of postoperative mortality and morbidity for CABG.We need pay more attention to perioperative management.

Objective To explore the value of computed tomography (CT)and magnetic resonance imaging (MRI)in the diagno-sis and delineation of the extent of malignant external otitis (MEO).Methods Clinical manifestations and imaging features of 10 pa-tients with definite diagnosis of MEO were collected and analyzed.Plain and contrast-enhanced CT of the ear were performed on all 10 patients,of which 6 patients also received MRI scans.Results Abnormal soft tissue opacity within the external auditory canal and involvement of surrounding structures were found in all 10 patients.Bone erosion of the external auditory canal was showed in 7 pa-tients.Other CT findings included bone erosion of skull base and intracranial involvement.Abnormal soft tissue of the external audi-tory canal,effusion in the mastoid cavity and medullary abnormalities were showed very well on MR images in 6 patients while the cortical bone erosion was not well showed.Conclusion Imaging features of the lesions in the external auditory canal,bone erosion of skull base and intracranial involvement play crucial roles in the diagnosis and delineation of the extent of the lesion in patients with MEO.

Objective To compare the outcomes of off-pump versus on-pump CABG.Methods From 2002 to 2008,CABG was performed in 105 patients aged 80 years and over,including 45 without cardiopulmonary bypass (CPB) or off-pump (OP) CABG (OPCAB) and 60 with CPB (onpump CABG).The outcomes were compared between two groups.Results The mean ICU stay was (37.1±30.3) h in OPCAB group and (60.6±58.2) h in on-pump CABG group (P＜0.01).Average ventilator-assisted time was (10.8±9.7) h for OPCAB group versus (22.3±35.7) h for onpump CABG group (P＜0.01).Postoperative atrial fibrillation occurred in 31.1％ of OPCABG patients and 41.7 ％ of on-pump CABG patients (P＜0.01).The mortality rate was 5.0％ in OPCABG group versus 8.3％ in on-pump CABG group (P＜0.05).Conclusions OPCABG is a safe and efficient method of myocardial revascularization in the elderly patients with lower morbidity and complications.

Objective To review the experience of perioperative management and effect of valve replacement combined with renal dysfunction.Methods 536 cases of valve replacement.According to preoperative glomerular filtration rate(GFR),renal dysfunction was classified as normal in 322 cases,mild in 162,moderate in 40 and severe in 12.Logistic regression analysis was used to assess the effect of preoperative renal dysfunction on operative mortality and morbidity.Results Patients with a lower GFR were older and more likely to have hypertention.They also tended to have larger left ventricular end-diastolic diameter and worse left ventricular ejection factor.Operative mortality rose inversely with declining renal function,from 2％ for those with normal renal function to 17％ for patients with severe renal dysfunction.Renal dysfunction was significantly associated with a large blood transfusions,re-intubation,longer mechanical ventilation,intensive care unit stay and hospital stay.Conclusion Preoperative renal dysfunction is an important factor of postoperative mortality and morbidity for valve replacement.We must pay more attention to perioperative management.