Sally Epstein, PhD
Former PhD candidate
sally.epstein@kcl.ac.uk
3rd floor Lambeth Wing
St Thomas' Hospital
SE1 7EH London
United Kingdom
Research
I successfully defended my PhD research at my viva on 15 August 2016. My thesis was titled "Assessment of Cardiovascular Biomarkers Derived from Peripheral Pulse Waveforms Using Computational Blood Flow Modelling".

In my PhD I investigated the ability of cardiovascular biomarkers calculated from peripheral pulse waveforms to estimate central properties of the cardiovascular system (e.g. aortic stiffness) using nonlinear one-dimensional (1-D) modelling of pulse wave propagation in the arterial network. To test these biomarkers, I produced novel 1-D models of pulse wave propagation under normal and pathological conditions.

In the first part of my thesis, I extended the modelling capabilities of the existing 1-D/0-D code to represent arterial blood flow under diabetes, hypertension, and combined diabetes and hypertension. Cardiac and vascular parameters of the 1-D model were tailored to best match data available in the literature to produce generalised hypertensive, diabetic, and combined diabetic and hypertensive population models. Using these models, I showed that the pulse waveform at the finger is strongly affected by the aortic flow wave and the muscular artery stiffness and diameter.

In the second part, I developed a new methodology for optimising the number of arterial segments in 1-D modelling required to simulate precisely the blood pressure and flow waveforms at an arbitrary arterial location (Am J Phys, 2015). This is achieved by systematically lumping peripheral 1-D model branches into 0-D models that preserve the net resistance and total compliance of the original model. The methodology is important to simplify the computational domain while maintaining the precision of the numerical predictions – an important step to translate 1-D modelling to the clinic.

My thesis provided novel computational tools of blood flow modelling and waveform analysis for the design, development and testing of pulse wave biomarkers. These tools may help bridge the gap between clinical and computational approaches.

Experience and Education
07/2012 - 08/2016
PhD Candidate at King's College London, London, UK
Department of Imaging Sciences and Biomedical Engineering
Supervisors: Dr. Jordi Alastruey, Prof Phil Chowienczyk
10/2009 - 06/2012
Bachelor of Mathematics at Oxford University, UK
Mathematical Institute
Publications
Collaborations and Links