Assessment of Model Based (Input) Impedance, Pulse Wave Velocity, and Wave Reflection in the Asklepios Cohort

Area of Science:

• Cardiovascular Physiology
• Biomedical Engineering
• Medical Imaging

Background:

• Arterial stiffness and wave reflection are crucial surrogates for ventricular and vascular load, predicting cardiovascular events.
• Current clinical assessments are often laborious, limiting widespread application.
• Non-invasive methods are sought to simplify the evaluation of these hemodynamic parameters.

Purpose of the Study:

• To investigate arterial stiffness and central hemodynamics using arterial tonometry and echocardiography.
• To compare these measures against surrogates derived from a mathematical pressure and flow model.
• To assess the feasibility of model-based surrogates in a healthy middle-aged cohort.

Main Methods:

• Carotid artery tonometry and echocardiography were performed on 2226 participants.
• Systemic hemodynamics, arterial stiffness, and wave reflection parameters were measured.
• Echocardiography-derived flows were replaced with flows from a novel mathematical model for comparison.

Main Results:

• All investigated parameters demonstrated a significant association between the traditional and model-based methods.
• Acceptable overall agreement was observed for characteristic impedance, forward and backward pressure amplitudes, and pulse wave velocity.
• Mean differences indicated good concordance between the two approaches.

Conclusions:

• Model-based surrogates for arterial stiffness and central hemodynamics are feasible in a healthy middle-aged population.
• This approach warrants further investigation for clinical utility.
• Mathematical modeling offers a promising avenue for simplifying hemodynamic assessments.