Objective:To evaluate the effect of modified surgical techniques on hemostasis used in aortic root replacement with a composite graft(Bentall procedure).Methods:Data on 15 patients who underwent Bentall procedure duri...Objective:To evaluate the effect of modified surgical techniques on hemostasis used in aortic root replacement with a composite graft(Bentall procedure).Methods:Data on 15 patients who underwent Bentall procedure during 2005 to 2007 were analyzed.The first 5 patients(Group 1) received the standard procedure.Then next 10 patients(Group 2) received the modified procedure.Techniques including "tandem suture line","endo-button buttress","sandwich anastomosis" and "left ventricle filling" were added to the standard procedure.Perioperative bleeding and the volume of blood transfusion required were compared to estimate hemostasis in different groups.Results:Between groups 1 and 2,a significant difference was found in postoperative bleeding [(2193±383) ml vs(1012±258) ml,respectively;P<0.05] and in volume of blood transfusion required [(7242±1416) ml vs(2520±708) ml,respectively;P<0.05].Conclusion:The modified surgical techniques used in our study are effective in the improvement of the hemostasis in Bentall procedure.展开更多
It is known that a strictly piecewise monotone function with nonmonotonicity height ≥ 2 on a compact interval has no iterative roots of order greater than the number of forts. An open question is: Does it have iterat...It is known that a strictly piecewise monotone function with nonmonotonicity height ≥ 2 on a compact interval has no iterative roots of order greater than the number of forts. An open question is: Does it have iterative roots of order less than or equal to the number of forts? An answer was given recently in the case of "equal to". Since many theories of resultant and algebraic varieties can be applied to computation of polynomials, a special class of strictly piecewise monotone functions, in this paper we investigate the question in the case of "less than" for polynomials. For this purpose we extend the question from a compact interval to the whole real line and give a procedure of computation for real polynomial iterative roots. Applying the procedure together with the theory of discriminants, we find all real quartic polynomials of non-monotonicity height 2 which have quadratic polynomial iterative roots of order 2 and answer the question.展开更多
文摘Objective:To evaluate the effect of modified surgical techniques on hemostasis used in aortic root replacement with a composite graft(Bentall procedure).Methods:Data on 15 patients who underwent Bentall procedure during 2005 to 2007 were analyzed.The first 5 patients(Group 1) received the standard procedure.Then next 10 patients(Group 2) received the modified procedure.Techniques including "tandem suture line","endo-button buttress","sandwich anastomosis" and "left ventricle filling" were added to the standard procedure.Perioperative bleeding and the volume of blood transfusion required were compared to estimate hemostasis in different groups.Results:Between groups 1 and 2,a significant difference was found in postoperative bleeding [(2193±383) ml vs(1012±258) ml,respectively;P<0.05] and in volume of blood transfusion required [(7242±1416) ml vs(2520±708) ml,respectively;P<0.05].Conclusion:The modified surgical techniques used in our study are effective in the improvement of the hemostasis in Bentall procedure.
基金supported by the National Basic Research Program of China (Grant No. 2011CB302402)National Natural Science Foundation of China (Grant Nos. 61021004 and 10825104)Shanghai Leading Academic Discipline Project (Grant No. B412)
文摘It is known that a strictly piecewise monotone function with nonmonotonicity height ≥ 2 on a compact interval has no iterative roots of order greater than the number of forts. An open question is: Does it have iterative roots of order less than or equal to the number of forts? An answer was given recently in the case of "equal to". Since many theories of resultant and algebraic varieties can be applied to computation of polynomials, a special class of strictly piecewise monotone functions, in this paper we investigate the question in the case of "less than" for polynomials. For this purpose we extend the question from a compact interval to the whole real line and give a procedure of computation for real polynomial iterative roots. Applying the procedure together with the theory of discriminants, we find all real quartic polynomials of non-monotonicity height 2 which have quadratic polynomial iterative roots of order 2 and answer the question.
