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Performance of the Chronically Hypoxic Young Rabbit Heart

机译:慢性缺氧幼兔心脏的表现

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摘要

Hearts isolated from 30 rabbits, raised from birth to ~5 weeks of age under either hypoxic (FIO2, 0.10) or normoxic (FIO2, 0.21) conditions, underwent retrograde aortic perfusion using a nonrecirculating, well-oxygenated crystalloid solution. The left ventricular end diastolic pressure was initially set at ~5 mmHg. Aerobic performance was studied by measuring peak systolic pressure (PSP), coronary flow, glucose oxidation, and oxygen consumption. Anaerobic function was assessed by determining time for the onset of contracture (TOC) in the presence of zero coronary flow. Hypoxic vs normoxic hearts (mean ± SEM): heart rate, 197 ± 6 vs 190 ± 5 beats per minute; PSP, 136 ± 4* vs 108 ± 4 mmHg; (+) dP/dt max, 2294 ± 125* vs 1549 ± 144 mmHg/sec; relaxation time constant (Tau), 26.9 ± 1.1* vs 41.6 ± 4.8 msec; (−) dP/dt max, 1422 ± 43* vs 1001 ± 63 mmHg/sec; coronary flow, 86.3 ± 4.2* vs 59.9 ± 2.9 ml/min/gdry; glucose oxidation, 3511 ± 118* vs 2979 ± 233 nmol/min/gdry; oxygen consumption, 28.2 ± 1.4* vs 22.7 ± 1.4 µmol/min/gdry; and TOC, 11.8 ± 1.2* vs 22.9 ± 2.2 min (*p < 0.05). Hearts isolated from young rabbits, exposed to hypoxia from birth, exhibited enhanced ventricular systolic and diastolic mechanical function, elevated coronary flow, retained capacity for aerobic metabolism, and a shorter TOC compared to their normoxic counterparts.
机译:从30只兔子中分离出的心脏在缺氧(FIO2 ,0.10)或常氧(FIO2 ,0.21)的条件下从出生到约5周龄,使用非循环,良好的血流逆行主动脉灌注。含氧晶体溶液。最初,左心室舒张末期压力设定为〜5 mmHg。通过测量峰值收缩压(PSP),冠状动脉血流,葡萄糖氧化和耗氧量来研究有氧运动性能。通过确定存在零冠状动脉血流的挛缩开始时间(TOC)评估无氧功能。低氧与常氧心脏(平均值±SEM):心率,每分钟197±6 vs 190±5拍; PSP,136±4 *和108±4 mmHg; (+)dP / dt max ,2294±125 *与1549±144 mmHg / sec;松弛时间常数(Tau)26.9±1.1 * vs 41.6±4.8毫秒; (-)dP / dt max ,1422±43 *和1001±63 mmHg / sec;冠状动脉血流量为86.3±4.2 * vs 59.9±2.9 ml / min / gdry 葡萄糖氧化:3511±118 *与2979±233 nmol / min / gdry 耗氧量为28.2±1.4 *与22.7±1.4 µmol / min / g干和TOC,分别为11.8±1.2 *和22.9±2.2分钟(* p <0.05)。从幼兔中分离出来的心脏,从出生时就处于缺氧状态,其心室收缩和舒张机械功能增强,冠状动脉血流增加,有氧代谢能力得以保持,与正常氧相比,其TOC较短。

著录项

  • 来源
    《Pediatric Cardiology》 |2004年第4期|397-405|共9页
  • 作者单位

    Department of Pediatric Cardiology Tulane University School of Medicine 1430 Tulane Avenue New Orleans LA 70112;

    Department of Pediatric Cardiology Tulane University School of Medicine 1430 Tulane Avenue New Orleans LA 70112;

    Department of Pediatric Cardiology Tulane University School of Medicine 1430 Tulane Avenue New Orleans LA 70112;

    Department of Pediatric Cardiology Tulane University School of Medicine 1430 Tulane Avenue New Orleans LA 70112;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Myocardial performance; Chronic hypoxia; Immature hearts; Contracture;

    机译:心肌功能;慢性缺氧;心脏未成熟;挛缩;

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