The Effect of Heart Rate, Preload, and Afterload on the Viscoelastic Properties of the Swine Myocardium View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2004-09

AUTHORS

Dan Ewert, Bruce Wheeler, Curt Doetkott, Constantine Ionan, George Pantalos, Steven C. Koenig

ABSTRACT

Experiments were performed to test the hypothesis that viscoelastic properties of the swine myocardium are independent of heart rate (HR), preload (PL), and afterload (AL). Left ventricular pressure and aortic flow (AoF) waveforms were recorded in 13 swine. At different paced heart rates, an inferior vena caval occlusion (IVC) was used to reduce PL, then the IVC was released and simultaneously the aorta was clamped to increase AL. Equivalent left ventricular pressure waveform pairs consisting of an ejecting waveform (denoted as LVP) and isovolumic waveform (denoted as hydromotive pressure, HMP) were selected according to specified criteria resulting in 371 equivalent waveform pairs. From the selected waveform pairs and corresponding aortic flow waveforms, the viscoelastic properties (k and epsilon1) were estimated by HMP = LVP + epsilon1 V(EJ) + k x LVP x AoF. Here epsilon1 is the parallel elastance, k is the myocardial friction, and V(EJ) is the integral of AoF over ejection. Next, using k, epsilon1, LVP, and AoF waveforms, HMP was estimated using the equation above. To validate the model, the measured HMP and model-calculated HMP were compared for 371 matched waveform pairs (R2 = 0.97, SEE = 3.7 mmHg). The viscoelastic parameters (k and epsilon1) did not exhibit any clear or predictable dependence on HR, PL, and AL. More... »

PAGES

1211-1222

Identifiers

URI

http://scigraph.springernature.com/pub.10.1114/b:abme.0000039355.53117.6f

DOI

http://dx.doi.org/10.1114/b:abme.0000039355.53117.6f

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1010657541

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/15493509


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