Xin-Yi Bu, Jian-Kai Wang, Yong Zhang, Li-Hai Chen, Jia-Cong Liu, Ya-Mai Zhao, Hong-Wei Shi, Ya-Li Ge
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引用次数: 0
Abstract
Background: In general, cerebral blood flow accounts for 10-15% of cardiac output (CO), of which about 75% is delivered through the carotid arteries. Hence, if carotid blood flow (CBF) is constantly proportional to CO with high reproducibility and reliability, it would be of great value to measure CBF as an alternative to CO. The aim of this study was to investigate the direct correlation between CBF and CO. We hypothesized that measurement of CBF could be a good substitute for CO, even under more extreme hemodynamic conditions, for a wider range of critically ill patients.
Methods: Patients aged 65-80 years, undergoing elective cardiac surgery were included in this study. CBF in different cardiac cycles were measured by ultrasound: systolic carotid blood flow (SCF), diastolic carotid blood flow (DCF), and total (systolic and diastolic) carotid blood flow (TCF). CO simultaneously was measured by transesophageal echocardiography.
Results: For all patients, the correlation coefficients between SCF and CO, TCF and CO were 0.45 and 0.30, respectively, which were statistically significant, but not between DCF and CO. There was no significant correlation between either SCF, TCF or DCF and CO, when CO was <3.5 L/min.
Conclusions: Systolic carotid blood flow may be used as a better index to replace CO. However, the method of direct measurement of CO is essential when the patient's heart function is poor.
期刊介绍:
The Heart Surgery Forum® is an international peer-reviewed, open access journal seeking original investigative and clinical work on any subject germane to the science or practice of modern cardiac care. The HSF publishes original scientific reports, collective reviews, case reports, editorials, and letters to the editor. New manuscripts are reviewed by reviewers for originality, content, relevancy and adherence to scientific principles in a double-blind process. The HSF features a streamlined submission and peer review process with an anticipated completion time of 30 to 60 days from the date of receipt of the original manuscript. Authors are encouraged to submit full color images and video that will be included in the web version of the journal at no charge.