Document Detail

Pulmonic valve function during thoracic artificial lung attachment.
MedLine Citation:
PMID:  18356655     Owner:  NLM     Status:  MEDLINE    
Pulmonic valve incompetence has been observed during implantation of total artificial lungs (TAL) and may contribute to right ventricular dysfunction in certain attachment modes. The roles of pulmonary system resistance and inertia on valve function were examined retrospectively using data from attachments of a prototype TAL in six pigs. The TAL was attached in parallel and in series with the natural lungs and a hybrid of parallel and series. These conditions lead to varying conditions of resistance and inertia in each animal. The periods of ejection (TE), regurgitation (TR), and sealed valve (TSV), and the regurgitant fraction (Fr) were determined at each condition. The relationships between these variables and the effective pulmonary system resistance (R) and the calculated inertial pressure drop during flow deceleration (DeltaPI) were determined. A large R created pulmonic valve incompetence and increased regurgitation, as evidenced by a decreased TSV. A highly negative DeltaPI decreased regurgitation by increasing TE. When R <5 mm Hg/(L/min), Fr remained at baseline levels, regardless of other conditions. When R >5 mm Hg/(L/min), the relationship between Fr, R, and DeltaPI was found to be Fr = 0.014R + 0.011DeltaPI + 0.15 (R = 0.82). Thus, pulmonary system resistance should be maintained <5 mm Hg/(L/min) to avoid pulmonic valve incompetence. High device inertance reduced regurgitation but also lead to increased pulmonary system impedances and ventricular work. The design and implementation of a TAL, thus, should focus on having a small effective pulmonary system resistance.
Alexander S Kuo; Carrie E Perlman; Lyle F Mockros; Keith E Cook
Related Documents :
25353795 - Possible oriented transition of multiple-emulsion globules with asymmetric internal str...
1622695 - Closing sounds and related complaints after heart valve replacement with st jude medica...
3711495 - Accuracy and pitfalls of doppler evaluation of the pressure gradient in aortic coarctat...
2325355 - Doppler measurement of cardiac output across prosthetic mitral valves.
1400085 - Ejecting volume, filling volume and stroke volume gains: new indexes of inotropism and ...
6296185 - Metabolic and blood pressure responses to hydrocortisone in the syndrome of apparent mi...
Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  ASAIO journal (American Society for Artificial Internal Organs : 1992)     Volume:  54     ISSN:  1538-943X     ISO Abbreviation:  ASAIO J.     Publication Date:    2008 Mar-Apr
Date Detail:
Created Date:  2008-03-21     Completed Date:  2008-05-13     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9204109     Medline TA:  ASAIO J     Country:  United States    
Other Details:
Languages:  eng     Pagination:  197-202     Citation Subset:  IM    
Department of Surgery and Biomedical Engineering, University of Michigan, Ann Arbor, Michigan, USA.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Artificial Organs*
Blood Circulation
Pulmonary Valve / physiology*
Vascular Resistance*
Grant Support

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Hemodialysis using a valveless pulsatile blood pump.
Next Document:  Reducing the effects of the systemic inflammatory response to cardiopulmonary bypass: can single dos...