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Numerical Simulation of Hemodynamic Changes During Beating‐heart Surgery: Analysis of the Effects of Cardiac Position Alteration in an Animal Model
Author(s) -
Ferrari Gianfranco,
De Lazzari Claudio,
De Kroon Thom L.,
Elstrodt Jan M.,
Rakhorst Gerhard,
Gu Y. John
Publication year - 2007
Publication title -
artificial organs
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.684
H-Index - 76
eISSN - 1525-1594
pISSN - 0160-564X
DOI - 10.1111/j.1525-1594.2007.00343.x
Subject(s) - hemodynamics , trendelenburg position , cardiac output , trendelenburg , blood flow , medicine , cardiology , coronary circulation , circulatory system , anesthesia
Hemodynamic instability, mostly due to vertical lifting of the heart, is usually observed during beating‐heart surgical procedures. However, some hemodynamic parameters, such as coronary blood flow, are not routinely measured. A digital computer model of the circulation able to simulate and analyze the effects of heart lifting and the Trendelenburg maneuver, and thus supply detailed hemodynamic information to the clinicians would provide a useful analytical tool. A lumped parameters model of the circulation was applied to both β‐blocked and not β‐blocked pigs. The results confirmed a drop of cardiac output and coronary flow during heart lifting and a rise of both variables after the Trendelenburg maneuver for β‐blocked animals. In not β‐blocked pigs, the analysis was more complex but the model reproduced experimental data and permitted coronary flow to be estimated. These results showed the feasibility of numerical simulation for specific circulatory conditions encountered during beating‐heart surgery.