ObjectiveTo establish a novel animal model of deep hypothermic circulatory arrest (DHCT) in rabbits without thoracotomy, and investigate acute kidney injury (AKI) induced by DHCT and early novel biomarkers of AKI. MethodsForty-two New Zealand big ear rabbits (3.5-4.0 kg, male or female) were randomly divided into 2 groups with 21 rabbits in each group. Cardiopulmonary bypass (CPB) was established via the right carotid artery and jugular vein in both groups. In Group A, CPB continued when the rectal temperature was maintained at 28℃. In group B, DHCT started when the rectal temperature reached 16℃ to 18℃ and lasted for 60 minutes before CPB was resumed and rewarming was started. The rectal temperature was restored to 35℃ within 30 minutes, then CPB was maintained for 30 minutes. CPB time was same in both groups. Preoperatively and 6 hours, 24 hours and 48 hours after the operation, venous blood samples were taken to examine serum creatinine (Cr) and β-trace protein (β-TP), and urine samples were taken to examine neutrophil gelatinase-associated lipocalin (NGAL). Four rabbits were sacrificed at respective above time points to measure renal malondialdehyde (MDA) content. Hematoxylin-Eosin (HE) staining, TUNEL assay and transmission electron microscopy were used to examine morphological changes of renal tubular epithelial cells (TECs). ResultsFour rabbits died in group A and five rabbits died in Group B during the experiment.(1)Blood Cr:There was no statistical difference between different time points in Group A (P > 0.05). In Group B, serum Cr at 24 hours after the operation was significantly higher than other time points, and also significantly higher than that of group A (P < 0.05).(2)Blood β-TP and urinary NGAL:There was no statistical difference between different time points in Group A (P > 0.05). In Group B, blood β-TP and urinary NGAL at the time of 6 hours, 24 hours and 48 hours postoperatively were significantly higher than preoperative levels (P < 0.05). Blood β-TP and urinary NGAL at the time of 24 hours postoperatively were significantly higher than other time points (P < 0.05). Blood β-TP and urinary NGAL at the time of 6 hours, 24 hours and 48 hours postoperatively were significantly higher than those of group A (P < 0.05).(3)Renal MDA content of Group B at the time of 24 hours postoperatively was significantly higher than other time points as well as that of Group A (P < 0.05).(4) HE staining showed serious pathological injuries of renal TECs at the time of 24 hours postoperatively in Group B. There was no significant pathological injury of renal TECs at the time of 24 hours postoperatively in Group A. (5)TUNEL-positive rate of group B at the time of 24 hours postoperatively was significantly higher than other time points as well as that of group A (P < 0.05).(6)Transmission electron microscope showed serious pathological injuries of renal TECs organelles at the time of 24 hours postoperatively in Group B. There was no significant pathological injury of renal TECs organelles in Group A. ConclusionsThis DHCT rabbit model without thoracotomy is a simple, convenient, and economical animal model with long-term animal survival for the study of DHCT-induced organ injury. AKI is most serious at the time of 24 hours after DHCA. Blood β-TP and urinary NGAL can be used as early biomarkers of DHCT-induced AKI.
ObjectiveTo investigate surgical treatment strategies for diffuse coronary artery disease (CAD). MethodsFrom January 2003 to June 2013, 92 patients with diffuse CAD received complete coronary revascularization including coronary artery bypass grafting (CABG)and coronary endarterectomy (CE)in the First Affiliated Hospital of China Medical University. There were 63 male and 29 female patients with their age of 52-81 (68.7±10.5)years. After CE and during follow-up, coronary CT angiography (CTA)was used to assess graft patency, and improvement of patients' cardiac function and angina symptoms were observed. ResultsTarget vessel diameter of the 92 patients was all larger than 1.5 mm after CE. Sixty-three patients (with 69 CE grafts)received intraoperative graft blood flow measurement, showing 59 grafts (85.5%)with satisfactory blood flow[blood flow 13-42 (23.4±12.7)ml/min, pulsatility index (PI)1.6-4.2 (2.1±1.1)]. Six patients (6.5%)had perioperative myocardial infarction (MI), and 4 patients (4.3%)died within 30 days after surgery including 2 patients with acute MI and cardiogenic shock, 1 patient with low cardiac output syndrome and multiple organ failure, and 1 patient with massive cerebral infarction. Seventy-three patients (83%)were followed up for 6-108 (49.3±26.7)months after discharge, and 15 patients were lost during follow-up. During follow-up, coronary CTA showed graft patency of 83.9% after CE. Four patients (5.5%)died including 1 patient with heart failure and pulmonary infection, 1 patient of unexplained sudden death, 1 patient with cerebral hemorrhage, and 1 patient with lung cancer. Five-year survival rate was 87% after CE. Six months after CE, ejection fraction (EF)was significantly higher than preo-perative EF (55.6%±9.7% vs. 50.2%±10.5%, P < 0.05), patients' cardiac function significantly improved, and their angina symptoms were significantly relieved. ConclusionCABG with CE can improve coronary revascularization for patients with diffuse CAD, and short-and long-term results are satisfactory.
ObjectiveTo explore the effect of skeletonized left internal mammary artery (LIMA) in coronary artery bypass grafting (CABG). MethodsA total of 122 patients who underwent pure CABG were recruited in the study in the First Affiliated Hospital of China Medical University between January and April 2013. There were 77 males and 45 females with age of 41-76(62.8±10.5) years. They were randomly assigned to received CABG with skeletonized LIMAs (group A, 60 patients) or pedicle LIMAs (the group B, 62 patients) by random digital table. LIMAs were all anastomosised to the left anterior descending artery. ResultsThere was one patient failure in harvesting LIMA process in the group A and B respectively, and they were changed to saphenous vein grafts and excluded from the criteria. There were 2 and 3 patients of postoperative myocardial infarction in the group A and in the group B respectively, with incidence rate of 3.4% and 4.9% respectively (P > 0.05). One patient died in each group during hospitalization with hospital mortality rates of 1.7% and 1.6% respectively (P > 0.05). Complications such as mediastinal infection occurred zero and one patient in the group A and in the group B respectively (P > 0.05). LIMA harvesting time of the group A was statistically longer than that of the group B (30.7±7.2 min vs. 17.2±5.6 min, P < 0.05). In six months of follow-up after surgery, coronary CT showed patency rate of LIMA in the group A and in the group B was 96.8% and 100.0% respectively (P > 0.05). ConclusionThe recent effect of skeletonized LIMA as graft material in CABG is satisfactory.
ObjectiveTo explore the inhibition action of valproic acid to inflammatory cells and smooth muscle cells then to find out that valproic acid (VPA) can repress rat thoracic aortic aneurysm or not. MethodsThe model of rat thoracic aortic aneurysm was built through the method of soaking the adventitia of artery using porcine pancreatic elastase (PPE). The rats were divided into three groups:a normal saline blank control group (a C group), an adventitia soaked PPE group (a P group), and adventitia soaked PPE plus intraperitoneal injection by injecting intraperitioneal VPA 200 mg/kg for seven days (a PV group).The animals of the three groups were all using vascular ultrasound to detect blood vessel diameter. Animals were killed after operation to observe the general morphology of vascular aneuysm and do the immunohistochemial, morphological, protein analysis of interleukin 1 (IL-1), interleukin 6 (IL-6), smooth muscle 22 alpha (SM22α), matrix metallopeptidase 2 (MMP-2), MMP-9 and Western blot by drawing animals on the 14th day. ResultsThe vessels diameter in the PV group was narrower than that in the P group (P value<0.05). HE staining, immunohistochemistry and Western blot displayed that the cells in the P group were in disorder arrangement and interstitial disorder while the cells in the PV group maintained better albumin layer. The protein expressions of IL-1, IL-6, MMP-2, and MMP-9 in the PV group decreased except that SM22α increased. ConclusionVPA can inhibit phenothpic transforming of aneurysm inflammatory cells and smooth muscle cells, reduce the levels of cell proliferation, decrease the secretion of matrix metalloproteinases, and depress tumor growth of rat thoracic aorta.
ObjectiveTo evaluate the short-term result of proximal lengthening grafted stent and modified innominate artery cannula for Stanford A aortic dissection. Method We retrospectively analyzed the clinical data of 21 patients with Stanford A aortic dissection in our hospital between December 2012 and January 2015. There were 16 males and 5 females at a mean age of 57 years. All 21 patients underwent total arch replacement with proximal lengthening grafted stent and modified innominate artery cannula invented by our center. Result The mean operation time of 21 patients was 187.0±31.1 minutes, the mean cardiopulmonary bypass time was 116.0±32.0 minutes, the mean aortic block time was 87.0±23.0 minutes, the mean selective cerebral perfusion (SCP) time was 23.0±3.9 minutes, the mean breathing machanical ventilation time was 19.0±6.0 hours, and the mean intensive care unit stay time was 3.0±0.9 days. All patients had a good recovery after surgery. There was no death or severe complications. ConclusionThe technique of total arch replacement with proximal lengthening grafted stent and modified innominate artery cannula for Stanford A aortic dissection is effective, easy, and safe. The short-term result is satisfying.
ObjectiveTo summarize clinical experience of different surgical strategies for the treatment of acute Stanford type A aortic dissection (AD). MethodsClinical data of 197 patients with acute Stanford type A AD who underwent surgical treatment in the First Affiliated Hospital of China Medical University from January 2008 to November 2012 were retrospectively reviewed. There were 131 males and 66 females with their age of 24-77 (51.2±13.9) years. All the patients received magentic resonance imaging (MRI) or aortic CT angiography (CTA) for the establishment of diagnosis. According to different aortic root conditions,ascending aorta replacement,Bentall,Wheat,Cabrol or David procedures were performed. Total arch replacement, hemiarch replacement or simplified total arch replacement was also performed for aortic arch dissection combined with stented elephant trunk implantation. ResultsA total of 113 patients (57.4%) underwent isolated ascending aorta replacement,67 patients (34.0%) received Bentall procedure,13 patients (6.6%) received Wheat procedure,1 patient(0.5%) received Cabrol procedure,and 3 patients (1.5%) received David procedure. Eighty-two patients (41.6%) underwent total arch replacement combined with stented elephant trunk implantation,77 patients (39.1%) received hemiarch replacement, and the other 41 patients (20.8%) received simplified total arch replacement combined with stented elephant trunk implantation. One patient (0.5%) underwent reexploration for postoperative bleeding. No permanent neurological complication occurred. Thirty-day mortality after surgery was 4.1% (8/197). Follow-up duration was 3-52 (15.9±11.4) months with the follow-up rate of 65.0%. One patient with Marfan syndrome died of abdominal aortic aneurysm rupture 8 months after surgery. ConclusionAccording to different AD conditions, appropriate surgical strategies can be chosen to achieve satisfactory clinical outcomes for patients with acute Stanford type A AD.