Medical & Biological Engineering & Computing

, Volume 47, Issue 2, pp 221–232

Wave intensity analysis and the development of the reservoir–wave approach

  • John V. Tyberg
  • Justin E. Davies
  • Zhibin Wang
  • William A. Whitelaw
  • Jacqueline A. Flewitt
  • Nigel G. Shrive
  • Darryl P. Francis
  • Alun D. Hughes
  • Kim H. Parker
  • Jiun-Jr Wang
Special Issue - Review

Abstract

The parameters of wave intensity analysis are calculated from incremental changes in pressure and velocity. While it is clear that forward- and backward-traveling waves induce incremental changes in pressure, not all incremental changes in pressure are due to waves; changes in pressure may also be due to changes in the volume of a compliant structure. When the left ventricular ejects blood rapidly into the aorta, aortic pressure increases, in part, because of the increase in aortic volume: aortic inflow is momentarily greater than aortic outflow. Therefore, to properly quantify the effects of forward or backward waves on arterial pressure and velocity (flow), the component of the incremental change in arterial pressure that is due only to this increase in arterial volume—and not, fundamentally, due to waves—first must be excluded. This component is the pressure generated by the filling and emptying of the reservoir, Otto Frank’s Windkessel.

Keywords

Pressure Windkessel Aorta Wave intensity analysis Frank Reservoir Wave 

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Copyright information

© International Federation for Medical and Biological Engineering 2009

Authors and Affiliations

  • John V. Tyberg
    • 1
  • Justin E. Davies
    • 2
  • Zhibin Wang
    • 3
  • William A. Whitelaw
    • 4
  • Jacqueline A. Flewitt
    • 5
  • Nigel G. Shrive
    • 6
  • Darryl P. Francis
    • 2
  • Alun D. Hughes
    • 2
  • Kim H. Parker
    • 7
  • Jiun-Jr Wang
    • 1
  1. 1.Departments of Cardiac Sciences and Physiology & PharmacologyUniversity of CalgaryCalgaryCanada
  2. 2.Imperial College Healthcare NHS TrustInternational Centre for Circulatory Health, St Mary’s Hospital CampusLondonUK
  3. 3.Qingdao University Medical College HospitalQingdaoChina
  4. 4.Department of Medicine (Emeritus Professor)University of CalgaryCalgaryCanada
  5. 5.Stephanson Cardiovascular MR CentreUniversity of CalgaryCalgaryCanada
  6. 6.Department of Civil EngineeringUniversity of CalgaryCalgaryCanada
  7. 7.Physiological Flow Unit, Department of BioengineeringImperial CollegeLondonUK

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