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veterinary
farriery
2019
Expert Opinion

A 1D computer model of the arterial circulation in horses: An important resource for studying global interactions between heart and vessels under normal and pathological conditions.

Authors: Vera Lisse, Campos Arias Daimé, Muylle Sofie, Stergiopulos Nikos, Segers Patrick, van Loon Gunther

Journal: PloS one

Summary

# Editorial Summary: Arterial Circulation Modelling in Horses Arterial rupture during exercise, pharmacological stress, or parturition remains a poorly understood clinical phenomenon in horses, yet human cardiovascular research has successfully employed computational haemodynamics to investigate abnormal pressure and flow dynamics. Researchers developed a one-dimensional computer model of the equine arterial network using post-mortem anatomical measurements (vessel lengths, diameters, branching angles), in vivo ultrasound flow data from multiple arteries (common carotid, external iliac, median, aorta), and invasively recorded pressure curves, with parameters adjusted specifically for equine physiology using Womersley theory and a time-varying elastance model of left ventricular function. The model successfully predicted physiologically plausible pressure and flow waveforms throughout the arterial tree, with simulated flow patterns matching measured profiles; inclusion of gravitational effects further improved accuracy, and wave power analysis explained the resulting flow characteristics. This computational tool now enables practitioners and researchers to predict how haemodynamic changes occur secondary to intense exercise, advancing age, breed variations, gender differences, or altered arterial compliance—providing mechanistic insight into conditions predisposing horses to vascular failure. The model represents a significant advancement in equine cardiovascular research and may ultimately inform preventative strategies for exercise-related arterial complications.

Read the full abstract on PubMed

Practical Takeaways

  • This computational model provides a non-invasive research tool to understand why arterial rupture occurs during exercise or pharmacological stress, potentially informing prevention strategies
  • The model's ability to predict pressure and flow changes with age, breed, and gender variation could help identify high-risk horses before clinical incidents occur
  • Future applications may include testing interventions to reduce arterial rupture risk in performance horses and breeding recommendations based on arterial biomechanics

Key Findings

  • A validated 1D computer model of equine arterial circulation was successfully developed using post-mortem anatomical data, in vivo ultrasonographic flow profiles, and invasive pressure measurements
  • Simulated pressure and flow waveforms throughout the arterial tree showed plausible predictions consistent with measured flow profiles
  • Incorporation of gravity effects improved model predictions of arterial waveforms in horses
  • The model can predict changes in flow profiles and local pressures resulting from strenuous exercise or altered arterial wall properties related to age, breed, or gender

Conditions Studied

arterial rupture during exercisearterial rupture after phenylephrine administrationuterine artery rupture during parturition