Effect of experimental alcoholism on structure and regenerative powers of the neonatal myocardium and liver of the next generation of newborn rats

Department of Pathological Anatomy, I. N. Ul'yanov Chuvash University, Nizhnii Novgorod. (Presented by Academician of the Academy of Medical Sciences of the USSR D. S. Sarkisov.) Translated from Byulleten' Éksperimental'noi Biologii i Meditsiny, Vol. 112, No. 11, pp. 552–553, November, 1991.     

风湿性二尖瓣狭窄心肌病理改变与心肌运动的关系

目的 :探讨风湿性二尖瓣狭窄 (Mitralstenosis ,MS)患者心肌病理改变与心肌运动的关系 .方法 :MS患者 2 2例术前行常规心脏超声及组织多普勒成像 (Dopplertissueimag ing,DTI)检查 ,于心尖四腔切面记录室间隔侧二尖瓣环长轴方向射血期频谱S波和舒张期频谱D波峰值及心电图R波至频谱S波起始点的时间T ,选取 3个波幅最大的心动周期 ,算出此 3个心动周期的平均值S3 、D3 和T3 ;二尖瓣置换术中切取左室乳头肌行病理检查 .结果 :微动脉Di/Do与D3 呈正相关 ,(r =0 .5 0 ,P <0 .0 5 ) ;心肌纤维化程度与T3 呈正相关 ,(r=0 .6 8,P <0 .0 5 ) ;而S3 与D3 呈正相关 ,(r =0 .4 3,P <0 .0 5 ) .结论 :术前DTI检查测量D3 及T3 ,可以反映心肌病理变化 ,有助于对MS患者手术适应证的掌握及对预后的判断     

家兔化学裸露心肌标本制备及其张力-pCa关系

家兔右室乳头肌在含3mM EDTA、5mM Na_2ATP、10mM Tris、140 mM KCl的溶液中浸浴150min,其Ca~(2+)通透性显著增高。Ca~(2+)浓度为10~(-7)M时,便可产生张力,10~(-4.6)M时,张力达到最大。相对张力-pCa(Ca~(2+)浓度的负对数)关系近似一S形曲线,产生50％最大张力的Ca~(2+)(pCa_(50))约为10~(-6.6)M。同法制备的大鼠乳头肌Ca~(2+)通透性未见增高。     

心肌酶测定在窒息新生儿心肌损害32例中的应用价值

目的通过对32例窒息后心肌受累的新生儿治疗前后心肌酶谱测定，了解心肌酶谱在窒息新生儿心肌损害诊治中的意义。方法32例均自入院后12h及治疗后5～7天各静脉采血1次，作GOT、LDH、CK、CK-MB检查。结果窒息后心肌损害治疗前后心肌酶谱各项指标比较差异均有显著统计学意义（P〈0．01），出院时心肌酶多恢复正常。结论对窒息新生儿做心肌酶谱检查，有利于早期发现心肌损害并及时治疗，并可作为判断疗效及预后的指标。     

Isolated noncompaction of the ventricular myocardium

Isolated noncompaction of the ventricular myocardium is a recently described anomaly. We report the first case of this anomaly presenting as a restrictive cardiomyopathy, and the first association of this entity with endocardial fibrosis.     

高频消融心室肌和心律失常的实验研究

应用2.59MHz的高频消融心室肌和兔实验性心律失常的兴奋灶。结果表明,高频可引起心肌局灶性凝固性坏死;高频消融乌头碱注射部位,可使实验性心律失常恢复正常的时间明显缩短。高频消融未见有并发症。     

Preponderance of β- over α-adrenoceptors in mediating the positive inotropic effect of phenylephrine in the ferret ventricular myocardium

Summary [³H]prazosin bound to the membrane fraction derived from the ferret ventricular muscle with high affinity in a saturable manner (K _d = 0.25 nmol/l and B _max = 27 fmol/mg protein in the right ventricle). [³H]CGP-12177, a -adrenoceptor ligand, bound to the membrane fraction with a _{K d} value of 0.29 nmol/l and a B _max of 42 fmol/mg protein. In the isolated ferret papillary muscle driven at 1 Hz at 37°C, phenylephrine elicited a concentration-dependent positive intropic effect. The maximal effect of phenylephrine was comparable to that of isoprenaline. Prazosin (0.3 ol/l) shifted the concentration-response curve for phenylephrine slightly but significantly to the right, the maximal response being unaffected. In contrast, bupranolol (0.3 gmol/l) shifted the curve for phenylephrine markedly downwards: the maximal response was depressed significantly to 40% and the curve became less steep. In the presence of prazosin and bupranolol the curve was shifted to the right, being essentially parallel to the control curve. These results indicate that in the ferret ventricular myocardium both - and -adrenoceptors mediate the positive inotropic effect of phenylephrine. The extent of contribution of the two classes of adrenoceptor is quite different from that in other mammalian species. In the ferret heart, -adrenoceptors predominate over -adrenoceptors in mediating the positive inotropic effect of phenylephrine, although the number of -adrenoceptors is not especially high when compared with other species. Send offprint requests to M. Endoh at the above address     

Pathomorphological characteristics of cardiac remodeling after myocardial infarction

Dilatational, hypertrophic, aneurysmal, and endocardial variants of remodeling were revealed in the postinfarction heart. The most prevalent dilatational remodeling is characterized by uniform or nonuniform elongation of ventricular cavities and increase in ventricular volume. Characteristic features of the hypertrophic type are hypertrophied interventricular septa and left ventricular wall and reduced or unchanged left ventricular volume. Pronounced changes in the configuration of the left ventricle due to the formation of single or multiple aneurysms were typical of aneurysmal remodeling. Endocardial remodeling was characterized by cicatricial changes and smoothed relief of the parietal endocardium. These variants and forms of remodeling determine disturbances in intracardial hemodynamic and thanatogenesis in the postinfarction period.     

Initiation of stress protein synthesis in the myocardium of coronary patients

We studied myocardial biopsy specimens from the right atrium of cardiological patients with different degree of cardiac ischemia obtained during surgery. No inducible HSP70 stress proteins were detected in atrial cardiomyocytes of patients with the WPW syndrome without signs of ischemic injuries of the heart. These proteins were detected in the myocardium of coronary patients. Their expression was more intense in patients with coronary disease paralleled by the development of myocardial dyskinesia. Two-dimensional electrophoresis showed only acid HSP70 but no alkaline isoforms in coronary patients even with pronounced dyskinesia. Presumably, alkaline HSP70 isoforms are present in the myocardium directly involved in the dyskinesia zone.Translated from Byulleten Eksperimentalnoi Biologii i Meditsiny, Vol. 138, No. 10, pp. 412–415, October, 2004