Atherosclerotic plaque rupture is the main cause of many cardiovascular diseases, and biomechanical factors play an important role in the process of plaque rupture. In the study of plaque biomechanics, there are relatively few studies based on fatigue fracture failure theory, and most of them mainly focus on the whole fatigue propagation process from crack initiation to plaque rupture, while there are few studies on the influence of crack on plaque rupture at a certain time in the process of fatigue propagation. In this paper, a two-dimensional plaque model with crack was established. Based on the theory of fracture mechanics and combined with the finite element numerical simulation method, the stress intensity factor (SIF) and related influencing factors at the crack tip in the plaque were studied. The SIF was used to measure the influence of crack on plaque rupture. The results show that the existence of crack can lead to local stress concentration, which increases the risk of plaque rupture. The SIF at the crack tip in the plaque was positively correlated with blood pressure, but negatively correlated with fibrous cap thickness and lipid pool stiffness. The effect of the thickness and angle of lipid pool on the SIF at the crack tip in the plaque was less than 4%, which could be ignored. This study provides a theoretical basis for the risk assessment of plaque rupture with cracks.
ObjectiveTo summarize surgical treatment experience on unruptured aneurysm of the sinus of Valsalva (SVA). MethodsClinical data of 33 patients with unruptured SVA underwent surgical repair at Fu wai Hospital between February 2007 and January 2012 were retrospectively analyzed. There were 27 males and 6 females with their mean age of 28.5±13.5 years (ranged from 4.5 to 58.0 years). The unruptured SVA originated in the right coronary sinus in 29 cases (87.8%), in non-coronary in 2 cases (6.1%) and in left coronary sinus in 2 cases (6.1%). There were 29 cases with ventricular septal defect and 20 cases with aortic valve insufficiency (AI). ResultsOnly 52.8% of unruptured SVA were correctly diagnosed by echocardiography preoperatively. All unruptured SVA received active surgical management, with no early death after operation. Thirty patients (90.9%) were followed up for 22 to 81 months (mean 42.9±18.8 months) and in NYHA classⅠorⅡ. None SVA recurrence occurred. Postoperative AI could be improved better by using the repair route only through the chamber of right ventricle for patients with unruptured SVA originated in right coronary sinus. ConclusionFor unruptured SVA patients who associated with other kinds of cardiovascular lesions, active surgical repair for unruptured SVA can achieve satisfactory results.
Objective To explore the diagnosis and treatment for spontaneous rhexis hemorrhage of liver cancer. Methods Clinical data of thirty patients who suffered from spontaneous rhexis hemorrhage of liver cancer from January 1995 to March 2009 were collected and analyzed retrospectively. Results Twenty-six cases were stanched by surgical therapy, in which 14 cases underwent liver cancer resection, 10 cases underwent bleeding transfixion and hepatic artery ligation (or intubation), and 2 cases underwent omentum stuff transfixion. Four cases died one week after surgery, one died after 15 d, 9 cases died 1 to 3 months after operation, 5 cases survived after 4 to 6 months, 3 cases survived after 7 to 12 months, and in 4 cases survival time was longer than 12 months (in which one patient’s survival time was 16 months, one was 5 years and two patients were still alive with survival time of 3 and 13 years respectively). Four patiens went through the non-surgical therapy and survival time was 3 to 14 d. Conclusion The spontaneous rhexis hemorrhage of the liver cancer is not the telephase of the liver cancer. Early diagnosis and operation can stanch bleeding effectively. The surgical therapy is better than the non-surgical therapy. Resection of liver neoplasms in time can raise long-term survival time.
【Abstract】ObjectiveTo study the mechanism of spontaneous rupture of hepatocellular carcinoma (HCC). MethodsArticles have been reviewed to find out the theory of spontaneous rupture of HCC. ResultsResearchful results suggested that the injury of small arteries was usually followed in patients of spontaneous rupture of HCC. In this review, the immune complex, which composed of hepatitis B virus e antigen, complement C1q and immunoglobulins, was found deposited in the elastic membrane of arteries. Likely as a result of immune complex deposition, vascular injury occurs mainly in the small arteries where the deposition of immune complex was present. The small arteries in which immune complex deposited are readily injuried and cause hemorrhage and rupture of HCC during vascular load increase. ConclusionWe would conclude that immune complex deposition in vessel wall led to the small arteries injury may be the factor involved in the pathogenesis of spontaneous ruptured HCC.
ObjectiveTo summarize the treatment effects and success rate of spleen-preserving treatments for patients with splenic injury, and to explore the ideal spleen-preserving treatment for different types of splenic injury. MethodWe retrospectively analyzed the clinical data of 136 patients with splenic injury who underwent spleen-preserving treatment in the Department of Hepatobiliary Surgery between July 1998 and December 2010. And the treatment effects of different combined treatment methods were compared and studied. ResultsTwenty-seven patients were treated without surgery; 23 underwent vascular suture combined with fibrin glue treatment; 26 accepted splenic artery ligation, partial suture and fibrin glue treatment; 20 underwent ultrasonic scalpel partial splenectomy and wound spray fibrin glue treatment; 17 accepted splenic artery ligation and RF hemostatic cutter row spleen resection; and 23 accepted laparoscopic ultrasonic scalpel with partial splenectomy and wound spray fibrin glue treatment. Spleen-preserving succeeded in 131 cases (95.58%) and failed in 5 cases (4.42%) without any deaths. ConclusionsIn the treatment of splenic injury, the success rate of different methods of spleen-preserving is close. The success rate of combined use of several spleen-preserving methods together is higher. Under the principle of "Save lives first, and preserve spleen second", we should carry out individualized treatment plan for the patients based on patients' general condition, the extent and grade of splenic rupture, and medical equipment and technical conditions. For those medical units with good treatment conditions, combined spleen-preserving treatment can be performed.
Objective?To investigate clinical characteristics， diagnosis， and treatment for patients with spontaneous esophageal rupture， and improve clinical diagnostic and treatment level.?Methods?We retrospectively analyzed the clinical data of 34 patients with spontaneous esophageal rupture who were treated in Subei People’s Hospital from January 1996 to June 2010. There were 28 male patients and 6 female patients with their age ranging from 32 to 80 years old (mean 57.6 years old). Main clinical manifestations included severe chest and abdominal pain after vomiting， fever， dyspnea and shock. The duration between disease onset and establishing diagnosis ranged from 4 hours to 7 days. Thirteen patients received conservative treatment including chest drainage， retrograde gastrointestinal decompression and enteral nutrition through jejunostomy. Twenty one patients received surgical treatment including layered anastomosis of the ruptured esophagus， retrograde gastrointestinal decompression and enteral nutrition through jejunostomy.?Results?All the patients were cured without in-hospital death. The mean hospital stay of the 13 patients who received conservative treatment was 46 days， while that of the 21 patients who received surgical treatment was 17 days. All the ruptured esophagus were one-stage healed. All the 34 patients were followed up from l to 8 years， including 11 patients in the conservative treatment group and 19 patients in the surgical treatment group， but 4 patients was lost during follow-up. All the patients had a normal diet without symptoms of esophageal stricture， reflux esophagitis or chronic thoracic empyema.?Conclusion Spontaneous esophageal rupture is a thoracic emergency with a high misdiagnosis rate and mortality．Early diagnosis， early surgical repair of ruptured esophagus and satisfactory chest drainage play a vital role in the treatment for patients with spontaneous rupture of esophagus.
OBJECTIVE To evaluate the effect of various covering tissues for improving the cure rate of spontaneous rupture of esophagus. METHODS From 1970 to 1994, 13 cases with spontaneous rupture of esophagus were performed primary repair, among them, 10 cases were covered by pedicled greater omentum after impair, and the other 3 cases were covered by pedicled pleural flap. RESULTS: Satisfactory result and complete recovery were obtained in all 10 cases by using pedicled greater omentum. Two cases among 3 cases using pedicled pleural flap suffered re-rupture of esophagus at 5 days and 8 days after operation, and died because of whole body exhaustion. CONCLUSION Pedicled greater omentum is a good covering tissue for repair of spontaneous rupture of esophagus.