期刊
AMERICAN JOURNAL OF PHYSIOLOGY-HEART AND CIRCULATORY PHYSIOLOGY
卷 313, 期 6, 页码 H1155-H1161出版社
AMER PHYSIOLOGICAL SOC
DOI: 10.1152/ajpheart.00287.2017
关键词
dobutamine; cardiac output; blood pressure; internal carotid artery; external carotid artery
资金
- Japanese Ministry of Education, Culture, Sports, Science and Technology [15H003098]
- National Institute of General Medical Sciences [GM-068865]
- United States Department of Defense Grant [W81XWH-12-1-0152]
- Grants-in-Aid for Scientific Research [15H03098] Funding Source: KAKEN
The effect of acute increases in cardiac contractility on cerebral blood flow (CBF) remains unknown. We hypothesized that the external carotid artery (ECA) downstream vasculature modifies the direct, influence of acute increases in heart rate and cardiac function on CBF regulation. Twelve healthy subjects received two infusions of dobutamine [first a low-dose (5 mu g.kg(-1).min(-1)) and then a high dose (15 mu g.kg(-1).min(-1))for 12 min each. Cardiac output, blood (low through the internal carotid artery (ICA) and ECA, and echocardiographic measurements were performed during dobutamine infusions. Despite increases in cardiac contractility, cardiac output, and arterial pressure with dobutamine, ICA blood flow and conductance slightly decreased from resting baseline during both low-and high-dose infusions. In contrast, ECA blood flow and conductance increased appreciably during both low-and high-dose infusions. Greater ECA vascular conductance and corresponding increases in blood flow may protect overperfusion of intracranial cerebral arteries during enhanced cardiac contractility and associated increases in cardiac output and perfusion pressure. Importantly, these findings suggest that the acute increase of blood perfusion attributable to dobutamine administration does not cause cerebral overperfusion or an associated risk of cerebral vascular damage. NEW & NOTEWORTHY A dobutamine-induced increase in cardiac contractility did not increase internal carotid artery blood flow despite an increase in cardiac output and arterial blood pressure. In contrast, external carotid artery blood flow and conductance increased. This external cerebral blood flow response may assist with protecting from overperfusion of intracranial blood flow.
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