【正文】
Ischemia,心肌梗死(xīn jī ɡěnɡ sǐ) Myocardial infarction,心肌缺血與梗死的典型表現(xiàn)(biǎoxi224。n)是什么?,第八頁(yè),共三十五頁(yè)。,什么(sh233。n me)是可逆性心肌缺血? What is reversibility myocardial ischemia?,負(fù)荷(f249。h232。) stress 靜息 rest,第九頁(yè),共三十五頁(yè)。,為什么要做負(fù)荷(f249。h232。)心肌顯像?,靜息狀態(tài),正常(zh232。ngch225。ng)心肌和缺血心肌的心肌血流灌注分布可能為正常(zh232。ngch225。ng)。 負(fù)荷狀態(tài),正常區(qū)心肌血流增加,顯像劑分布均勻,而狹窄區(qū)心肌則不能相應(yīng)增加。,第十頁(yè),共三十五頁(yè)。,Coronary Flow Reserve and Hyperaemia,Resting coronary blood flow is normal until 90% stenosis Max coronary blood flow begins to decline when 50% Two types of stimuli to elicit max. coronary blood flow,Metabolic stress Pharmacological agents,第十一頁(yè),共三十五頁(yè)。,Cardiac Stress Test,Stress testing can be performed using either Dynamic exercise (運(yùn)動(dòng)負(fù)荷實(shí)驗(yàn)(sh237。y224。n)) Pharmacological stress (藥物負(fù)荷實(shí)驗(yàn)) (1) Vasodilator stress (dipyridamole, adenosine) 血管擴(kuò)張負(fù)荷 (2) Inotropic stress (dobutamine) 變力負(fù)荷,第十二頁(yè),共三十五頁(yè)。,冠脈造影(z224。oyǐng)能替代心肌灌注顯像嗎?,狹窄區(qū)的心肌供