Effectiveness of in vitro fenestration versus bypass surgery for type B aortic dissection involving the left subclavian artery / 中国胸心血管外科临床杂志

@#Objective    To analyze the effectiveness of in vitro fenestration versus bypass surgery techniques in the treatment of type B aortic dissection involving the left subclavian artery by thoracic endovascular aortic repair (TEVAR). Methods    Among the 53 patients with type B aortic dissection involving the left subclavian artery admitted to our center from January 2017 to October 2020, 23 underwent in vitro fenestration + TEVAR (a fenestration group with 18 males and 5 females aged 53.6±5.3 years), and 30 patients underwent left common carotid artery-left subclavian artery bypass + TEVAR (a bypass group with 24 males and 6 females aged 51.8±3.8 years). The effectiveness and safety between the two groups were compared. Results    The surgical success rate was 100.0% in both groups. And there was no death within postoperative 30 days and during the follow-up. There was no endoleak immediately postoperatively and during 1-year follow-up in the two groups. The operation time and hospitalization expenses in the fenestration group was less or shorter than those in the bypass group (P<0.05). The reduction in blood pressure of the left upper limb in the fenestration group was greater than that in the bypass group (P<0.05). There was no symptom of left upper limb ischemia, dizziness or hoarseness in both groups. Conclusion    The two methods of reconstruction of the left subclavian artery are safe and effective. In vitro fenestration can reduce surgical trauma and costs, and bypass surgery can provide better forward blood flow for the left subclavian artery.

Suggestions and summaries on multi-center management of acute aortic dissection surgery during COVID-19 epidemic in Hubei province / 中华胸心血管外科杂志

Objective:Since December 2019, novel coronavirus infection has occurred in Hubei province and spread throughout the country quickly. This new crown viral pneumonia was named as coronavirus disease of 2019 (COVID-19) by WHO. However, at present, there is a high incidence of acute aortic dissection in winter and spring. How to prevent the spread of the epidemic and choose the appropriate treatment is an important topic for the patients with acute aortic dissection.Methods:From January 16, 2020 to February 26, 2020, a total of 37 of acute aortic dissection operations were carried out in several cardiovascular surgery centers in Hubei Province. There were 18 cases of Stanford type A aortic dissection and 19 cases of Stanford type B aortic dissection. There were 10 cases (55.55%) with ascending aorta replacement and 7 cases (38.89%) with Bentall procedure for aortic root surgery, and total arch replacement with stented elephant trunk implantation were performed in 14 cases (77.8%). In 19 patients with Stanford type B aortic dissection, thoracic endovascular aortic repair was performed, with the left subclavian artery chimney technique in 2 cases.Results:No deaths occurred within 30 days of hospitalization. Preoperative nucleic acid testing excluded 7 cases of novel coronavirus infection, and 3 suspected cases underwent emergency surgery. the three-level protective standard was adopted in the majority of the surgeries(62.2%, 23/37), and 11 patients were negative in the reexamination of viral nucleic acid after the operation.Conclusion:During the epidemic period, patients with acute aortic dissection should be carefully identified with actife COVID-19 before surgery. The treatment principles-" prevention and control of pneumonia epidemic should be emphasized, conservative medical management should be taken in the comfirmed cases, the selective operation should be delayed as far as possible, and the operation should be reasonable performed in critical cases" should be followed, which can save patients' lives to the greatest extent and prevent the spread of the virus.

Application of modified David technique to aortic sinus repair in acute type A aortic dissection / 中华胸心血管外科杂志

Objective@#To summarize the effect of modified David technique on acute type A aortic dissection sinus formation.@*Methods@#From March 2018 to September 2018, modified David technique was applied to aortic sinus remodeling in acute A-type aortic dissection in 19 patients, 13 males and 6 females. The age was 45-67(50.42±15.37) years old and the weight was 45-112(60.32±25.18) kg. Single sinus(noncoronary sinus) was repaired in 15 cases, double sinus formation(noncoronary sinus+ right coronary sinus+ coronary artery transplantation) in 2 cases, left sinus Florid sleeve technical treatment plus double sinus formation(noncoronary sinus+ right coronary sinus+ coronary artery transplantation) in 1 case, Single sinus(noncoronary sinus) repaired and aortic vavle replacement in 1 case. Frozen elephant trunk and total arch replacement in 13 cases, hemiarch replacement in 3 cases.@*Results@#There were no deaths in this group. The cardiopulmonary bypass time was 176-245(193.27±32.46) minutes, the aortic cross clamp time was 105-187(122.36±18.57)minutes, and the operation time was 6.5-11.0(7.63±1.31) hours. The mechanical ventilation time was 18-122(48.27±34.73)hours, the intensive care unit stay time was 2-10(5.35±2.62) days, and the postoperative hospital stay was 7-22(12.63±3.25)days. There was no delayed sternal closure during operation, and there was no secondary thoracotomy after operation. One patient developed a transient advanced atrioventricular block. Transient neurological dysfunction was observed in 5 patients. All patients were followed up for more than half a year. The color Doppler echocardiography and computed tomography angiograph(CTA)showed no aortic regurgitation or residual dissection.@*Conclusion@#The application of modified David technique in the remodeling of aortic root sinus in acute type A aortic dissection is an effective technique with relatively simple process, which is worth promoting.

Innovative improvement of circulatory arrest technique in acute stanford type A aortic dissection / 中华胸心血管外科杂志

Objective Total aortic arch replacement and stented elephant trunk surgery is an important surgical method for acute type A aortic dissection, and the short, middle, long term curative effect has been recognized by more and more experts at home and abroad.Circulatory arrest was an independent risk factor for postoperative complications and mortality in patients with type A aortic dissection.The aim of this article is to observed the effection of a new technology to block aortic arch, whicn can shorten the circulatory arrest time to 2 minutes and avoid harm of circulatory arrest on patients.Methods From May 2016 to February 2017, 68 patients with acute type A aortic dissection were divided into the conventional group and the modified group.All the patients underwent total arch replacement and stented elephant trunk surgery.The rectal temperature of the conventional group was 25℃ and circulatory arrest time was 20 min.While the rectal temperature of the modified group was 28℃ and and circulatory arrest time was 2 min.Results In the conventional operation group, 3 patients died after operation while all the patients in the modified group were cured and discharged.There are no differences between the two groups in the time of cardiopulmonary bypass(CPB) and heart arrest time(P>0.05).There are Significant differences in CPB time, circulatory arrest time, postoperative awake time, intubation time, amount of blood used, the amount of drainage during the first two days after operation, the time staying in ICU and the postoperative time in hospital.And the modified group was much better.(P<0.05)Conclusion The results of new technology blocking aortic arch in the patients with acute type A aortic dissection are better than the conventional surgical approach during the perioperative period.This technology is simple and effective.It is worth promoting.

The effect of flow management of cerebral perfusion during aortic arch surgery on the neurological complication / 中华胸心血管外科杂志

Objective To investigate the effect of flow management of cerebral perfusion during aortic arch surgery on the neurological complication.Methods From March 2007 to November 2011,189 patients underwent aortic arch surgery with hypothermic circulatory arrest plus antegrade cerebral perfusion in our department.The clinical data were analyzed retrospectively.According to the different methods of cerebral perfusion flow nanagement,patients were divided into two groups.Single pump with double limb (to the lower body and brain) perfusion was used in group A (96 patients),based on natural distribution of petfusion flow without control.Modified flow management was used in group B (93 patients).A magnetic flow sensor probes was installed on the brain perfusion limb to monitor and control the cerebral perfusion flow precisely (10 ml · kg-1 · min-1).Postoperative neurological complications were compared between two groups.Results There was no significant difference between the two groups in CPB time,aortic clamping time and circulatory arreating time.However,the morbidity of postoperative neurological complications in group B was much lower than that in group A (1.1％ vs 5.2％,P ＜0.05).Conclusion When performing antegrade cerebral perfusion during aortic arch surgery,precisely control of cerebral perfusion flow can reduce the morbidity of postoperative neurological complications effectively.

Hybrid procedure for thoracic aortic disease / 华中科技大学学报（医学）（英德文版）

Form 2008 to 2009, four patients with complex thoracic aortic disease, including aortic aneurysms and dissections, were successfully treated in our department with a new treatment approach: hybrid procedure. Combined open surgery and endovascular repair were performed in these patients without deep hypothermia or circulatory arrest. Compared to those who underwent traditional open surgery in the same period, time of mechanical ventilation and ICU stay was decreased in these four patients. All of them were discharged soon after operation without postoperative complications or death. The result suggests that this new approach could be an option for thoracic aortic disease, but long-term and large-population studies are still required to demonstrate the safety and validity.

Mitral valve reconstruction and replacement for moderate to severe ischemic mitral regurgitation: comparison of midterm outcome and complications / 中华胸心血管外科杂志

Objective To compare the results of mitral valve reconstruction and replacement as treatments for moderate to severe ischemic mitral regurgitation(IMR), and report the mid-term outcome. Methods From June 2002 to May 2008, 83 pa-tients with moderate IMR(35 cases) and severe IMR (48 cases) underwent coronary artery bypass grafting(CABG) combined with mitral valvuloplasty (MVP) (n = 43) or mitral valve replacement (MVR) (n = 40). There were 49 males and 34 females with a mean age of (59.3±7.5) years(51 -77years). The procedures of MVP included annuloplasty with a Dacron or autologous per-icardium ring in 21cases, commissural annuloplasty in 9, quadrangular resection of the posterior leaflet in 9 and using St. Jude mitral annuloplasty ring in 4. In the cases underwent MVR, 28 patients received mechanical prostheses and 12 received biopros-theses. Results 30-day mortality rate was 2.3% for MVP and 5.0% for MVR (P >0.05). The 30-day complication rate was similar for the 2 groups but mechanical ventilation time was longer for MVR patients. Mild MR ocurred in 6 patients with MVP (P <0.05). Sevonty-six patients were followed by outpatient department visit or telephone for (20.2 ± 4.9) months (3 - 60 months). During the follow-up period, 7 patients with MVP had mild insufficiency but free off etber complications. All the valve prothesis functioned well. However, 3 cases had thromboembolic complications and 7 late deaths were recorded in MVR group. Five-year complication-free survival rate was 90% for MVP group and 61% for MVR. Conclusion MVP resulted in excellent durability and provided significant mid-term survival benefit over MVR. MVP should be the first choice for patients with chronic IMR.

Impact of NF-kappaB Activation on TNF-α and IL-1β Expression in Myocardial Ischemia/Reperfusion Injury / 华中科技大学学报(医学版)

Objective To study the impact of NF-kappaB activation on TNF-a and IL-1β expression in myocardial ischemia/reperfusion(I/R) injury.Methods Sixty-five Sprague-Dawley rats were randomly divided into three groups:sham,n=5;I/R:30 min of myocardial ischemia followed by 0,15,30,60,120.240 min of reperfusion,n=5 per subgroup;I/R+PDTC:PDTC(15 mg/kg)was given before ischemia,and the time points were the same as those in I/R group.TNF-a and IL-1β mRNA expression was detected by RT-PCR,activity of NF-KB was measured by electrophoretic mobility shift assay (EMSA),and MDA level in myocardium was assayed by TBA method.Results The expression of TNF-a and IL-1β was increased before reperfusion,reached their peak at the time point of reperfusion 30.60 min respectively.and remained high level at the 2nd h after reperfusion.NF-KB was activated 15 min after reperfusion,reached its peak at the first h after reperfusion.In I/R+PDTC group,NF-κB activation was blocked by PDTC.As compared with I/R group,the expression levels of TNF-a and IL-1β were decreased to varying degrees at each time point.and the content of MDA was also reduced in I/R+PDTC group.Conclusion NF-KB activation could play a pivotabrole in the expression of cytokine.Inhibition of NF-κB signal pathway might be a potential therapeutic strategy in reperfusion injury.

Surgical treatment of aortic aneurysm and aortic dissection: a retrospective analysis of 122 cases / 华中科技大学学报（医学）（英德文版）

The study summarizes the clinical experience of surgical treatments of various types of thoracic aneurysm and aortic dissection. Clinical data of 122 patients with thoracic aneurysm and aortic dissection during July 2005 to July 2008 were retrospectively analyzed. The elective operations were performed in 107 patients while emergency surgery was done in 15 cases. Different surgical strategies were employed on the basis of diseased region, including simple ascending aortic replacement (n=3), aortic root replacement (n=43), hemi-arch replacement /total arch replacement+elephant trunk technique (n=32), thoracic/thoracoabdominal aortic replacement (n=8) and endovascular repair (n=36). In this series, there is 4 cases of perioperative death due to massive cerebral hemorrhage (n=1), respiratory failure (n=1) and multiple organ dysfunction syndrome (MODS) (n=2). Three cases developed post-operative massive cerebral infarction and the relatives of the patients abandoned treatment. Instant success rate of endovascular repair was 100%. The intimal rupture was sealed. Blood flow was unobstructed in true lumen and no false lumen was visualized. It was concluded that aggressive surgery should be considered in the patients with thoracic aneurysm and aortic dissection. Surgical procedures should vary with the location and the nature of the lesions.

Effects of ethyl pyruvate on myocardial apoptosis and expression of Bcl-2 and Bax proteins after ischemia-reperfusion in rats / 华中科技大学学报（医学）（英德文版）

In order to study the effects of ethyl pyruvate on cardiomyocyte apoptosis following ischemia/reperfusion (I/R) in vitro and the expression of Bcl-2 and Bax proteins, isolated rat hearts were perfused in a Langendorff model. Twenty-four rats were randomly divided into 3 groups (n=8 in each group): control group was perfused for 120 min. In the I/R group, after 30 min stabilization the injury was induced by 30 min global ischemia followed by 60 min reperfusion. Ethyl pyruvate (EP) group was set up with the same protocol as I/R group except that it was supplied with 2 mmol/L EP 15 min before ischemia and throughout reperfusion. Myocardial malonaldehyde (MDA) content was measured. Myocardial apoptotic index (AI) was tested by terminal deoxynucleotidyl transferase mediated dUTP nick end labeling (TUNEL) method. The expression of anti-apoptotic protein Bcl-2 and pro-apoptotic protein Bax in cardiac myocytes was detected by immunohistochemistry. As compared with control group, the content of MDA, myocardial AI and the expression of Bcl-2, Bax proteins were increased significantly in I/R group, but the content of MDA, myocardial AI and the expression of Bax protein were decreased obviously and the expression of Bcl-2 protein was up-regulated in EP group (P<0.05). These results demonstrate that EP could inhibit apoptosis of cardiac myocytes possibly via alleviating oxidative stress, up-regulating Bcl-2 and down-regulating Bax proteins.

Comparison of anticoagulant effects on vein grafts between human TFPI gene transfection and aspirin oral administration / 华中科技大学学报（医学）（英德文版）

To develop a more efficient antithrombotic way after coronary artery bypass grafting (CABG), the anticoagulant effects were compared of human tissue factor pathway inhibitor (TFPI) gene transfection and aspirin oral administration (traditional method) on vein grafts. An eukaryotic expression plasmid pCMV-(Kozak) TFPI was prepared. Animal model of carotid artery bypass grafting was constructed. In operation, endothelial cells of vein grafts in TFPI group and empty plasmid control group were transfected with pCMV-(Kozak) TFPI and empty plasmid pCMV respectively, while no transfection was conducted in aspirin control group. After operation, aspirin (2 mg.kg(-1).(-1)) was administered (i.g.) in aspirin control group. Three days later, grafts (n=10) were harvested for RT-PCR, Western blotting and immunohistochemical analyses of exogenous gene expression and for pathological, scanning electron microscopic observation of thrombus. Thirty days later, the patency rates of remnant grafts (n=10) were recorded by vessel Doppler ultrasonography. Human TFPI gene products were detected in gene transferred vein grafts. Three days later, thrombi were found in 7 animals of aspirin control group and in 8 animals of empty plasmid control group, but in only 1 of TFPI group (P<0.01). Thirty days later, 5 grafts were occluded in empty plasmid control group, but none of grafts was occluded in the other groups (P<0.05). The endothelial surfaces of grafts in both of the control groups were covered with aggregated erythrocytes and platelets, and it were not seen in TFPI group. It was suggested that the anticoagulant effects on vein grafts of human TFPI gene transfection are better than those of aspirin.

The stable expression of human tissue-type plasminogen activator gene mediated by lipofectamine in human vein endothelial cell line cells / 生物医学工程学杂志

We have established a human umbilical vein endothelial cell (HUVEC) line monoclonal cells with the stable expression of human tissue-type plasminogen activator (t-PA) gene to provide a basis for further study on the vascular tissue engineering. Recombinant plasmid pcDNA3. 1-Myc-His B (-)/t-PA was constructed by insertion of t-PAcDNA originated from PBS/t-PA into eukaryotic expression vector pcDNA3. 1-Myc-His B(-) and transfected into hUVEC line cells mediated by lipofectamine. The positive clones were obtained by the screen of G418. The transcription and expression of t-PA gene were investigated by RT-PCR and Western blotting respectively. The t-PA activity was measured by chromogenic substrate assay. The positive clone cells which transcripted the mRNA of t-PA gene was obtained by RT-PCR. Immunoreactive human t-PA of the medium was significantly increased in the group of transfected gene when compared with that in the controlled and transfected plasmid without t-PA gene group. The biological activity of the protein of the t-PA in the media was increased significantly in the positive clone cells with t-PA gene transfected. The HUVEC line monoclonal cells with the stable expression of t-PA gene was established successfully.

Experimental study of tissue-type plasminogen activator gene to prevent vein grafts stenosis / 华中科技大学学报（医学）（英德文版）

The effects of in vivo local expression of recombined human tissue-type plasminogen activator (t-PA) gene on the thrombosis and neointima formation of vein grafts were explored. Jugular vein-to-artery bypass grafting was performed on 72 New Zealand white rabbits. The rabbits were divided into 3 groups according to the different processing methods: transfected t-PA gene group (n = 24), vector group (n = 24) and blank control group (n = 24). Samples of vein grafts were harvested at different time points after surgery. The expression of t-PA gene in vein graft was detected by RT-PCR and the synthesis of t-PA protein by Western-Blot assay. The t-PA activity was measured by chromogenic substrate assay. The Cr51 labeled platelets accumulation in vein grafts was counted. The histopathological changes were compared in intima hyperplasia index among the three groups after operation. The results showed that at the 2nd, 5th, 14th and 28th day after operation, RT-PCR and Western-blot confirmed the expression of t-PA mRNA and protein at the site of gene transfer. The t-PA activity detected on the 2nd, 5th, 14th and 28th day in experimental group was 370.63 +/- 59.44, 344.13 +/- 48.47, 252.87 +/- 51.80 and 161.75 +/- 68.94 U/g respectively, and disappeared on the 60th day and undetected in the control groups. The number of platelets accumulated in the vein grafts in gene group, vector group and blank control group was (85.04 +/- 21.58) 10(6), (225.87 +/- 85.13) 10(6) and (211.7 +/- 78.02) 10(6) respectively. The number of platelets accumulated in gene group was significantly fewer than that in the control groups. Morphometric analysis revealed that intimal hyperplasia was markedly reduced in the t-PA gene group as compared with that in the control groups. It was suggested that the local expression of t-PA gene in vein graft significantly inhibited the accumulation of platelets, thrombosis and concomitant intimal hyperplasia, by which stenosis of bypass graft could be prevented effectively.

Experimental Study of Tissue-type Plasminogen Activator Gene to Prevent Vein Grafts Stenosis / 华中科技大学学报（医学）（英德文版）

The effects of in vivo local expression of recombined human tissue-type plasminogen activator (t-PA) gene on the thrombosis and neointima formation of vein grafts were explored. Jugular vein-to-artery bypass grafting was performed on 72 New Zealand white rabbits. The rabbits were divided into 3 groups according to the different processing methods: transfected t-PA gene group (n =24), vector group (n=24) and blank control group (n=24). Samples of vein grafts were harvested at different time points after surgery. The expression of t-PA gene in vein graft was detected by RT-PCR and the synthesis of t-PA protein by Western-Blot assay. The t-PA activity was measured by chromogenic substrate assay. The Cr51 labeled platelets accumulation in vein grafts was counted. The histopathological changes were compared in intima hyperplasia index among the three groups after operation. The results showed that at the 2nd , 5th , 14th and 28th day after operation,RT-PCR and Western-blot confirmed the expression of t-PA mRNA and protein at the site of gene transfer. The t-PA activity detected on the 2nd, 5th, 14th and 28th day in experimental group was 370. 63±59.44, 344. 13±48.47, 252. 87±51.80 and 161. 75±68.94 U/g respectively, and disappeared on the 60th day and undetected in the control groups. The number of platelets accumulated in the vein grafts in gene group, vector group and blank control group was (85.04 ± 21.58) 106,(225. 87±85.13) 106 and (211. 57±78.02) 106 respectively. The number of platelets accumulated vealed that intimal hyperplasia was markedly reduced in the t-PA gene group as compared with that in the control groups. It was suggested that the local expression of t-PA gene in vein graft significantly inhibited the accumulation of platelets, thrombosis and concomitant intimal hyperplasia, by which stenosis of bypass graft could be prevented effectively.

Anti-CD25 monoclonal antibody modulates cytokine expression and prolongs allografts survival in rats cardiac transplantation / 中华医学杂志(英文版)

<p><b>OBJECTIVE</b>To investigate the role of anti- interleukin-2 receptor (CD25) monoclonal antibody in the regulation of cytokine mRNA expression of IL-1beta, IL-2, CD25, IL-4, IL-5, IL-6, IL-10, tumour necrosis factor-alpha (TNFalpha), and interferon-gamma (IFNgamma) in cardiac allografts to elucidate its immunological mechanism and role in rats that have undergone cardiac transplantation.</p><p><b>METHODS</b>These in vivo studies were conducted using a rat MHC mismatch SD to Wistar heterotopic cardiac transplant model. Simulect, an anti-CD25 antibody, was used to prevent allograft rejection. An increase in the rate of allograft survival was observed. Rats were sacrificed on day 1, 3, 5, 7, 9, 11, 14 post-transplantation and hearts were harvested for further study. Cytokine mRNA expression was determined by semiquantitative RT-PCR.</p><p><b>RESULTS</b>In the control group, cardiac allografts were rejected at 8.3 +/- 1.7 days after transplantation (x +/- s). The rats who received CsA rejected the cardiac allograft at 26.4 +/- 5.7 days post-transplant. Allograft survival of Simulect-treated rats was 29.2 +/- 7.1 days (P < 0.05 vs controls). Rats treated with simulect and CsA had the longest survival of 55.0 +/- 11.6 days (P < 0.001 vs controls). CD25 mRNA expression in the heart tissue samples of treated rats was undetectable or very weak. However, the untreated group, CD25 expression increased, although anti-CD25 decreased this CD25 expression in the heart graft. Furthermore, in untreated allografts, IL-2, TNFalpha and IFN-gamma were strongly expressed, an effect that markedly decreased after simulect treatment. Finally, IL-4, IL-5, IL-6 and IL-10 expression was strong in anti-CD25-treated allografts.</p><p><b>CONCLUSIONS</b>These results suggest that anti-CD25 antibody treatment may not only neutralize CD25 activity but also play a role in altering cytokine mRNA expression and prolong the survival of allografts.</p>

The Effect of Deep Anesthesia on the Postoperative Complications with CPB / 中国医师杂志

Objective Retrospectively discuss the effect of deep anesthesia on the post-operative complications with CPB. Methods All of the chosen patients including anesthesia group (30 cases) and deep anesthesia (30 cases) had the heart surgery under general anesthesia and CPB with the age of (56?6.4), the time of CPB (148?23.6) minutes, Medtronic membrane oxygenator, 4:1 cold blood cardioplegia, the flo of 2.0～2.4L?min -1 ?m -2 .The relative markers: operatively, the mean artery pressure (MAP), end tip oxygen saturation (SpO_2),the mean quantity of regitine (Regitine);postoperatively, the mean base-excess (BEpost), the mean quantity of 5% sodium bicarbonate per kilogram (NaHCO_3post),oxygen index, the level of blood glucose ,the duration of mechanical ventilation and intensive care unit stay , wound healing up, and the mortality. Results With deep anesthesia, the patients had more stable hemodynamic reserve operatively and significant improvements in the balance of acid-base, the lung function, the blood sugar , the wound recovery and the mortality. Conclusion The complication of postoperation with CPB is affected by the degree of anesthetic depth, and the proper depth of anesthesia can reduce the post-operative morbidity and mortality.