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Central Artery Hemodynamics in Angiotensin II-Induced Hypertension and Effects of Anesthesia

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Abstract

Systemic hypertension is a strong risk factor for cardiovascular, neurovascular, and renovascular diseases. Central artery stiffness is both an initiator and indicator of hypertension, thus revealing a critical relationship between the wall mechanics and hemodynamics. Mice have emerged as a critical animal model for studying effects of hypertension and much has been learned. Regardless of the specific mouse model, data on changes in cardiac function and hemodynamics are necessarily measured under anesthesia. Here, we present a new experimental-computational workflow to estimate awake cardiovascular conditions from anesthetized data, which was then used to quantify effects of chronic angiotensin II-induced hypertension relative to normotension in wild-type mice. We found that isoflurane anesthesia had a greater impact on depressing hemodynamics in angiotensin II-infused mice than in controls, which led to unexpected results when comparing anesthetized results between the two groups of mice. Through comparison of the awake simulations, however, in vivo relevant effects of angiotensin II-infusion on global and regional vascular structure, properties, and hemodynamics were found to be qualitatively consistent with expectations. Specifically, we found an increased in vivo vascular stiffness in the descending thoracic aorta and suprarenal abdominal aorta, leading to increases in pulse pressure in the distal aorta. These insights allow characterization of the impact of regionally varying vascular remodeling on hemodynamics and mouse-to-mouse variations due to induced hypertension.

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Acknowledgments

This research was supported, in part, by NIH Grants R01 HL105297 and R01 HL155105.

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Author notes

  1. S. E. Hopper and D. Weiss have contributed equally.

Authors and Affiliations

  1. Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI, USA

    S. E. Hopper & C. A. Figueroa

  2. Department of Biomedical Engineering, Yale University, New Haven, CT, USA

    D. Weiss & J. D. Humphrey

  3. Translational Research Imaging Center, Yale School of Medicine, New Haven, CT, USA

    N. Mikush

  4. Department of Thyroid and Vascular Surgery, 1st Hospital of China Medical University, Shen Yang, China

    B. Jiang

  5. Department of Biomedical Engineering, Maastricht University, Maastricht, The Netherlands

    B. Spronck

  6. LMGC, Universite’ Montpellier, CNRS, Montpellier, France

    C. Cavinato

  7. Department of Surgery, University of Michigan, Ann Arbor, MI, USA

    C. A. Figueroa

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Hopper, S.E., Weiss, D., Mikush, N. et al. Central Artery Hemodynamics in Angiotensin II-Induced Hypertension and Effects of Anesthesia. Ann Biomed Eng 52, 1051–1066 (2024). https://doi.org/10.1007/s10439-024-03440-0

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