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谢婉花 《中华生物医学工程杂志》2002,8(5)
报告28例法乐四联症根治术后病人防护低心排综合症护理体会,采用减少氧消耗量;适当应用心肌正性肌力药物;注意补充足够的血容量;合理使用血管扩张剂;纠正严重的心律紊乱等措施,28例术后发生低心排血量综合征仅3例,及时发现及时处理,防止并发症的发生. 相似文献
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冠心病患者血小板聚集和心功能关系的研究 总被引:2,自引:4,他引:2
本文观察了肾上腺素诱导的全血血小板聚集活性和心功能指标的关系。结果表明:血小板聚集性和每搏输出量呈非常显著负相关(P<0.001),和射血前期/左室射血时间(PEP/LVET,等容收缩期/左室射血时间呈显著正相关(P<0.002),与心舒早期功能指标无显著相关。因此,监测血小板聚集性的动态变化对了解心脏收缩功能和预报心肌梗塞,心性猝死发生的危险性具有一定的临床价值。 相似文献
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目的 探讨SD大鼠比目鱼肌的形态学特征随年龄增长的变化情况。方法 4、18、25和30月龄雄性SD大鼠比目鱼肌各5块,通过HE染色、琥珀酸脱氢酶(SDH)活性检测和免疫组织化学方法,观测比目鱼肌纤维形态、数目、肌肉横截面积及其内慢肌纤维和快肌纤维分布特征、横截面积与年龄相关的变化。
结果 比目鱼肌内肌纤维形状随年龄增长变得不规则,并伴以肌纤维劈裂和簇聚。30月龄较4月龄大鼠的比目鱼肌纤维总数减少(P<0.05),而且其与其余年龄组大鼠的肌肉横截面积比较亦明显减小(P<0.01)。仅4月龄和25月龄大鼠比目鱼肌内慢肌纤维横截面积相比无差别(P>0.05),而快肌纤维横截面积则表现为18月龄和25月龄比较无差异(P>0.05)。结论 30月龄SD大鼠比目鱼肌纤维总数、肌肉横截面积及其内慢肌纤维和快肌纤维横截面积与其他年龄组大鼠相比差异显著,提示在衰老后期骨骼肌功能可能会发生明显变化。 相似文献
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大鼠急性心肌缺血后中枢与外周生长抑素含量与心功能变化的观察 总被引:1,自引:0,他引:1
本工作首次报道的结扎大鼠左冠状功动脉降支,造成急性心肌缺血后,血液、垂体与部分脑区中生长抑素免疫活性物质含量明显升高,并伴有心肌收缩力减弱、左心室内压最大上升速率降低、左心室压峰值下降与血压下降等心功能抑制的变化.提示生长抑素可能参与急性心肌缺血的病理过程.这为临床心肌梗塞病人的救治提供了新的思路. 相似文献
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本文结合肌肉组织结构特征,用宽带换能器对肌纤维和肌纤维瘤组织结构背散射进行了实验和分析。结果表明,组织结构的变化,在散射谱上有明显特征表现,服纤维瘤背散射系数明显大于正常组织。 相似文献
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骨骼肌纤维类型及其细胞与分子基础 总被引:5,自引:0,他引:5
王东林 《国际病理科学与临床杂志》1995,15(1):9-11
骨骼肌纤维类型众多,不同肌组织分布和构成比例不同,以适应其复杂的功能。肌纤维类型及其表达的专一蛋白同功型的多样性,是骨骼肌功能差异和适应性的结构和分子基础。 相似文献
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甲状腺功能异常患者心肌酶变化的分析 总被引:2,自引:0,他引:2
吴在荣 《标记免疫分析与临床》2009,16(6):353-355
为了解原发性甲状腺功能减退症(甲减)患者和甲状腺功能亢进(甲亢)患者心肌酶的变化,检测了20例原发性甲减患者、27例甲亢患者以及30例健康体检者(对照组)的空腹血清天门冬酸氨基转移酶(AST)、肌酸激酶(CK)及其同工酶(CK-MB)、乳酸脱氢酶(LDH)及其同工酶(HBDH)、FT3、FT4、TSH、总胆固醇(Tch)。结果显示,原发性甲减患者AST、CK、CK-MB、LDH、HBDH及Tch均明显高于对照组(P分别〈0.01、0.01、0.01、0.01、0.05、0.01);TSH和FT4与心肌酶、Tch均无相关性;FT3与CK、CK-MB负相关(r=-0.53,-0.47,P均〈0.05),与Tch呈负相关(r=-0.504,P〈0.05);甲亢患者血清CK-MB明显高于对照组(P〈0.01),且血清FT4与CK-MB呈显著正相关(r=0.462,P〈0.01)。结论:原发性甲减患者和甲亢患者常伴心肌酶升高,其中甲减者FT3水平与CK、CK-MB、Tch升高关系更密切。 相似文献
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右室快速起博犬心室扩张及其逆转时心肌胶原和心功能的变化 总被引:2,自引:0,他引:2
目的和方法:观察犬心室扩张和逆转时心肌胶原含量、Ⅰ/Ⅲ比值变化及其对心功能的影响。17只家犬,随机分为:(1)持续起搏(PC组,n=6)组,以250次/min频率起搏4周。(2)恢复(RC组,n=6)组,持右室快速起搏4周停止起搏,恢复4周。(3)假手术(SO组,n=5)组。PC、RG组分别于起搏和恢复4周后,SO组于假手术1周后进行血流动力学、超声心动图以及心肌胶原检测;以羟脯氨酸法测定心肌胶原 相似文献
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目的和方法:观察犬心室扩张和逆转时心肌胶原含量、Ⅰ/Ⅲ比值变化及其对心功能的影响。17只家犬,随机分为①持续起搏(PC组,n=6)组,以250次/min频率起搏4周。②恢复(RC组,n=6)组,持续右室快速起搏4周停止起搏,恢复4周。③假手术(SO组,n=5)组。PC、RC组分别于起搏和恢复4周后,SO组于假手术1周后进行血流动力学、超声心动图以及心肌胶原检测;以羟脯氨酸法测定心肌胶原含量;十二烷基硫酸钠一聚丙烯酰胺凝胶电泳(SDS-PAGE)法测定心肌胶原Ⅰ/Ⅲ型比值。结果:与SO组比,PC组平均肺毛细血管楔压(MPCWP)、平均右房压(MRAP)、平均右室压(MRVP)显著增高,心排量(CO)、平均动脉压(MAP)、左室射血分数(EF)明显下降,心肌胶原含量增加,Ⅰ/Ⅲ型胶原比值显著降低(P<005),而RC组血流动力学改善,心肌间质胶原及Ⅰ/Ⅲ型胶原比值降低,停止起搏扩张心室逆转后心功能改善,胶原含量和成分也随之恢复 相似文献
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一氧化氮合酶(nitric oxide synthase,NOS)催化L-精氨酸的氧化反应生成L-胍氨酸和一氧化氮(nitric oxide,NO)。其产物NO可通过依赖cGMP(环磷酸鸟苷)途径与非依赖cGMP途径发挥其复杂的生理学功能,如在心血管系统具有维持血管张力、调节血压,抑制血管平滑肌细胞迁移、增生,抑制血小板聚集与白细胞对血管壁的粘附以及调节影响心肌收缩与舒张功能的作用,并参与心率变异调节功能。本文就3种NOS同工酶的基因及其基因表达调节及影响因素进行简要综述。着重介绍nNOS1的心脏自主神经调节机制,iNOS对心脏收缩抑制以及心脏保护与损伤的双重作用,并对eNOS参与心功能调节的机制及其它生理、病理学等方面研究进展进行综述。 相似文献
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充血性心力衰竭患者血浆N末端脑钠肽前体水平与心功能关系的探讨 总被引:1,自引:0,他引:1
探讨充血性心力衰竭(CHF)患者血浆氨基末端脑钠肽前体(NT-proBNP)水平与心功能的关系。选择心衰患者(心衰组)108例,正常体检者(对照组)30名,采用电化学发光免疫分析技术(ECLIA)检测血浆NT-proBNP水平,用超声心动图测定心衰患者的左心室射血分数(LVEF)。结果表明:心衰组血浆NT-proBNP水平显著高于对照组(P〈0.01),并且血浆NT-proBNP浓度随着心功能分级(NYHA分级)的增加而升高(均P〈0.01),而与LVEF呈负相关(r=-0.633,P〈0.01)。血浆NT-proBNP水平可作为CHF患者心功能检测的有效生化指标,并与心脏功能之间有较好的相关性。 相似文献
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目的:探讨病毒性心肌炎时免疫损伤对心肌细胞损害的发病机理。方法:成功建立自身免疫离体心肌细胞模型,在此基础上进行心肌细胞的细胞力学特性的分析。结果:免疫损伤对心肌细胞有明显的损害,心肌细胞收缩力下降,其中免疫损伤的心肌细胞在24小时的心肌收缩力下降比12小时更为明显。结论:免疫损伤使心肌细胞收缩力下降。 相似文献
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精神分裂症的自知力与执行功能的关系 总被引:6,自引:0,他引:6
目的 :探讨精神分裂症患者的自知力与执行功能的关系。方法 :应用阴性和阳性症状量表 (PANSS) ,韦氏康量卡片分类测验 (WCST)对 6 3例精神分裂症的自知力及执行功能进行了评定。结果 :在WCST测验中自知力有损害组较自知力无损害组持续错误多 ,分类完成数少 ,具有显著差异性 (P <0 .0 5 )。结论 :精神分裂症自知力的恢复受执行功能水平的影响。 相似文献
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Objective: To investigate the impacts of long-term right ventricular apical pacing on the ventricular remodeling and cardiac functions of patients with high-grade and third-degree atrioventricular blockage with normal heart structures and cardiac functions. In addition, we provide many evidences for choosing an optimal electrode implantation site.Methods: Study participants included patients who were admitted for pacemaker replacements and revisited for examinations of implanted pacemakers at outpatient. Pacemakers were implanted to treat high-grade and third-degree atrioventricular blockage. At the time of pacemaker implantation, patients had normal cardiac functions and showed no serious heart diseases or cardiac dilatation. The durations from the implantation to follow-up were more than 5 years. The pacing rate was higher than 80%. Patients with a left ventricular ejection fraction (LVEF) 〈 50% and a left ventricular end-diastolic diameter (LVEDD) 〉 55 mm were excluded. Ventricular remodeling was defined as follows:increase of LVEDD by 10% and a reduction of LVEF by 25% for five years after implantation. Cardiac functions were evaluated according to New York Heart Association (NYHA) classification.Results:A total of 82 patients with a mean age of (66.97±13.19) years (range, 12 to 91 years old),among which 39 male and 43 female were enrolled in this study. The average duration between two assessments was 8.7 years (104.4 months). Before pacemaker implantation, the average left atrial diameter (LA), LVEDD and LVEF were 37.0 mm, 50.23 mm and 64.87%, respectively. After the implantation, these values were 39.39 mm (P=0.000163), 50.82 mm (P=0.177842) and 60.50% (P=0.000104), respectively. Four patients (4.87%) had ventricular remodeling with deteriorations of cardiac function, three of which had anterior wall myocardial infarction after implantation and one had type II diabetes. Clinical symptoms of heart failure were not found among the patients who did not exhibit ventricular remodeling. Conclusion: Through a long-period follow-up study, we found that long-term right ventricular apical pacing in patients with normal heart structure and cardiac function would not generally cause ventricular remodeling and clinical deteriorations of cardiac function. Right ventricular apical is a safe and effective site for pacing electrode wire implantation. 相似文献
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Radoslaw Jaworski Ireneusz Haponiuk Ninela Irga-Jaworska Mariusz Steffens Maciej Chojnicki Konrad Paczkowski Jacek Zielinski 《Advances in medical sciences》2018,63(1):112-118
Purpose
This retrospective cohort study aimed to identify the early postoperative kinetics of C-reactive protein (CRP) and procalcitonin (PCT) in children undergoing tetralogy of Fallot (ToF) correction. The ability of these inflammatory markers to guide rational antibiotic usage was also determined.Materials and Methods
All consecutive children who underwent ToF correction in 2009–2016 in our referral pediatric cardiac surgery clinic in Gdansk, Poland and did not exhibit infection signs on early postoperative days (POD) were identified. All patients received 48 h antibiotic prophylaxis. Antibiotic treatment was extended or empirical antibiotic therapy was introduced if the clinician considered it necessary. CRP and PCT levels were measured on POD1–4 and 1–3, respectively.Results
Of the 60 eligible children, 44 underwent CRP testing only. The remaining 16 patients underwent both CRP and PCT testing. All patients had abnormally high CRP values after surgery. All patients who also underwent PCT testing also displayed elevated PCT levels. The CRP and PCT levels peaked on POD2 (median = 99.8 mg/L) and POD1 (median = 4.08 ng/mL), respectively. In the CRP-alone patients, antibiotic prophylaxis was prolonged or empirical antibiotic therapy was started in 59%; in the CRP and PCT group, this was 25% (p < 0.05).Conclusions
The children had elevated CRP and PCT levels after ToF correction, with peaks observed on POD2 and POD1, respectively. Monitoring both CRP and PCT in the early postoperative period may guide antibiotic therapy, thus reducing unnecessary treatment, additional toxicity, and adverse drug interactions without increasing treatment failure. Rational antibiotic treatment may also reduce antibiotic resistance. 相似文献17.
Microtextured Cell Culture Platforms: Biomimetic Substrates for the Growth of Cardiac Myocytes and Fibroblasts 总被引:3,自引:0,他引:3
Tejal A. Desai Jennifer Deutsch Delara Motlagh Wei Tan Brenda Russell 《Biomedical microdevices》1999,2(2):123-129
In order to understand the role of tissue adaptation to altered physiological states, a more physiologically and dimensionally relevant in vitro model of cardiac myocyte organization has been developed. This new cell culture system, created by microfabrication technology, provides an environment in which cells can maintain a differentiated in vivo cell phenotype. By creating microtextured geometries of varied dimension, we are able to maximize the perpendicular surface area for myocyte attachment. These platforms provide a biocompatible surface with specific microarchitectures upon which cells exhibit enhanced cellular adhesion due to increased surface area, three-dimensional geometries, and bioacceptable attachment moieties.These microtextured membranes are created using photolithography and microfabrication techniques. Silicone and polyglycolic/lactic acid interfaces with specified microarchitecture and surface chemistry have been designed, microfabricated, and characterized for this purpose. Advantages of the microtextured membranes include the high degree of reproducibility and the ability to create features on the micron and submicron size scale. Because of the flexibility of substrate material and the ease of creating micron size structures, this technique can be applied to many other physiological and biological systems, particularly for cell physiology and mechanobiology studies. 相似文献
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