Cortical Beta-amyloid Levels and Neurocognitive Performance After Cardiac Surgery

心脏手术后皮质 β-淀粉样蛋白水平和神经认知功能

• 批准号: 8095975
• 负责人: Joseph P Mathew
• 金额: $ 19.63万
• 依托单位: DUKE UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-07-25 至 2013-06-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8095975
• 关键词: Affinity; Age; Alzheimer' s Disease; Amyloid; Amyloid Fibrils; Amyloid beta-Protein; Amyloid deposition; Anesthesia procedures; Atherosclerosis; Brain; Cardiac; Cardiac Surgery procedures; Cardiopulmonary Bypass; Cerebral Emboli; Cerebrum; Clinic; Clinical; Cognitive deficits; Complication; Cross-Sectional Studies; Elderly; Event; Family; Functional Imaging; Functional disorder; Genotype; Half-Life; Image; Impaired cognition; Impairment; Incidence; Investigation; Lead; Life; Link; Maps; Memory; Nervous System Trauma; Neurocognitive; Neurologic; Neurological outcome; Neurons; Operative Surgical Procedures; Organ; Outcome; Outcomes Research; Patients; Pattern; Performance; Perioperative; Pharmacology; Phase; Pittsburgh Compound-B; Population; Positron-Emission Tomography; Postoperative Period; Prevention; Process; Quality of life; Relative (related person); Research Proposals; Risk; Role; Senile Plaques; Stroke; System; Technology; Tracer; aged; amyloid pathology; beta amyloid pathology; cardiovascular risk factor; functional loss; gray matter; health care delivery; improved; in vivo; insight; mild neurocognitive impairment; molecular imaging; mortality; multidisciplinary; neocortical; older patient; operation; prevent; uptake

DESCRIPTION (provided by applicant): Cognitive impairment after surgery occurs frequently in the large number of increasingly elderly patients undergoing cardiac surgery every year. Postoperative cognitive deficit (POCD) is present in 36-50% of patients in the early phases after surgery and has been shown to adversely impact quality of life as much as one year after surgery. The objective of our multidisciplinary Neurological Outcome Research Group is to understand the mechanisms underlying neurologic and neurocognitive dysfunction after cardiac surgery and to reduce the incidence of these devastating outcomes. Despite substantial advancement in technology, pharmacology, and perioperative organ protection leading to reductions in mortality associated with cardiac surgery, the incidence of POCD has changed little over the last ten years. While multiple etiologic factors have been proposed for this neurological injury including cerebral embolic processes and hypoperfusion, the role of brain amyloid burden has never been examined. Because cardiac surgery generally takes place in the aged, it is possible that the cognitive dysfunction seen in surgical patients is a form of mild cognitive impairment (MCI), a condition characterized by accumulation of amyloid beta-fibrils. Thus the primary aim of our study is to determine the relationship between b-amyloid deposition and POCD using positron emission tomography (PET) and a newer PET tracer with a high affinity for b-amyloid fibrils. Secondarily, we will assess regional patterns of amyloid deposition in patients with POCD and compare these patterns with a previously imaged group of 40 MCI subjects and 40 elderly controls. Little is more devastating to a patient or the patient's family than to have a successful operation that prolongs life, but is complicated by cognitive impairment resulting in a diminished quality of life and loss of functional independence. The results of our study will be invaluable to the prevention of POCD in that we will define the role of regional amyloid burden in POCD using functional imaging markers that reveal the earliest neuronal changes and thus generate new mechanistic insights. PUBLIC HEALTH RELEVANCE: Cognitive impairment is a common complication of cardiac surgery. In this research proposal, we plan to determine the relationship between brain amyloid plaque formation and postoperative cognitive dysfunction. Understanding this relationship may generate new treatments to prevent cognitive decline and thus improve quality of life and functional independence for the large number of elderly surgical patients.

描述（由申请人提供）：每年接受心脏手术的患者中，有越来越多的老年人经常出现术后认知障碍。36% -50%的患者在术后早期阶段存在术后认知障碍（POCD），并已被证明对术后一年的生活质量产生不利影响。我们的多学科神经预后研究小组的目标是了解心脏手术后神经和神经认知功能障碍的机制，并减少这些破坏性结果的发生率。尽管在技术、药理学和围手术期器官保护方面取得了长足的进步，导致与心脏手术相关的死亡率降低，但在过去十年中，POCD的发病率几乎没有变化。虽然这种神经损伤的多种病因已被提出，包括脑栓塞过程和灌注不足，但脑淀粉样蛋白负荷的作用从未被研究过。由于心脏手术通常在老年人中进行，因此手术患者的认知功能障碍可能是一种轻度认知障碍（MCI），其特征是淀粉样蛋白-原纤维的积累。因此，我们研究的主要目的是利用正电子发射断层扫描（PET）和一种对b-淀粉样蛋白原纤维具有高亲和力的新型PET示踪剂来确定b-淀粉样蛋白沉积与POCD之间的关系。其次，我们将评估POCD患者淀粉样蛋白沉积的区域模式，并将这些模式与先前成像的40名MCI受试者和40名老年对照组进行比较。对患者或患者家属来说，没有什么比成功的手术延长生命更具有毁灭性的了，但由于认知障碍而导致生活质量下降和功能独立性丧失。我们的研究结果将对POCD的预防具有宝贵的价值，因为我们将使用功能成像标记来确定区域淀粉样蛋白负荷在POCD中的作用，这些标记可以揭示最早的神经元变化，从而产生新的机制见解。