Abstract
Although widely used as a preclinical model for studying cardiovascular diseases, there is a scarcity of in vivo hemodynamic measurements of the naïve murine system in multiple arterial and venous locations, from head-to-toe, and across sex and age. The purpose of this study is to quantify cardiovascular hemodynamics in mice at different locations along the vascular tree while evaluating the effects of sex and age. Male and female, adult and aged mice were anesthetized and underwent magnetic resonance imaging. Data were acquired from four co-localized vessel pairs (carotid/jugular, suprarenal and infrarenal aorta/inferior vena cava (IVC), femoral artery/vein) at normothermia (core temperature 37 ± 0.2 °C). Influences of age and sex on average velocity differ by location in arteries. Average arterial velocities, when plotted as a function of distance from the heart, decrease nearly linearly from the suprarenal aorta to the femoral artery (adult and aged males: − 0.33 ± 0.13, R2 = 0.87; − 0.43 ± 0.10, R2 = 0.95; adult and aged females: − 0.23 ± 0.07, R2 = 0.91; − 0.23 ± 0.02, R2 = 0.99). Average velocity of aged males and average volumetric flow of aged males and females tended to be larger compared to adult comparators. With cardiovascular disease as the leading cause of death and with the implications of cardiovascular hemodynamics as important biomarkers for health and disease, this work provides a foundation for sex and age comparisons in pathophysiology by collecting and analyzing hemodynamic data for the healthy murine arterial and venous system from head-to-toe, across sex and age.
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Acknowledgments
Thank you to Dr. Olivia Palmer for her assistance with venous data acquisition.
Funding
This project is supported by Grant Number T32-HL125242 from the NIH (A. Colleen Crouch).
Author Contributions
A Colleen Crouch (ACC), Amos A. Cao (AAC), Ulrich M Scheven (UMS), and Joan M Greve (JMG). ACC conceived and designed the study; AAC wrote the PCMRI pulse sequence; ACC, AAC, UMS developed the in-house image analysis method; ACC collected and analyzed data, performed statistical analysis and interpreted the data; ACC and JMG wrote the paper; ACC and JMG critically revised the paper; all authors gave final approval of the paper.
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Supplementary material 1 (DOCX 20 kb) Table S1. A summary of arterial wall shear stress (average, systolic, and diastolic) data for all groups.
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Crouch, A.C., Cao, A.A., Scheven, U.M. et al. In Vivo MRI Assessment of Blood Flow in Arteries and Veins from Head-to-Toe Across Age and Sex in C57BL/6 Mice. Ann Biomed Eng 48, 329–341 (2020). https://doi.org/10.1007/s10439-019-02350-w
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DOI: https://doi.org/10.1007/s10439-019-02350-w