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- Title
A computer-based matrix for rapid calculation of pulmonary hemodynamic parameters in congenital heart disease.
- Authors
Lopes, Antonio Augusto; Miranda, Rogério dos Anjos; Gonçalves, Rilvani Cavalcante; Thomaz, Ana Maria
- Abstract
BACKGROUND: In patients with congenital heart disease undergoing cardiac catheterization for hemodynamic purposes, parameter estimation by the indirect Fick method using a single predicted value of oxygen consumption has been a matter of criticism. OBJECTIVE: We developed a computer-based routine for rapid estimation of replicate hemodynamic parameters using multiple predicted values of oxygen consumption. MATERIALS AND METHODS: Using Microsoft® Excel facilities, we constructed a matrix containing 5 models (equations) for prediction of oxygen consumption, and all additional formulas needed to obtain replicate estimates of hemodynamic parameters. RESULTS: By entering data from 65 patients with ventricular septal defects, aged 1 month to 8 years, it was possible to obtain multiple predictions for oxygen consumption, with clear between-age groups (P <.001) and between-methods (P <.001) differences. Using these predictions in the individual patient, it was possible to obtain the upper and lower limits of a likely range for any given parameter, which made estimation more realistic. CONCLUSION: The organized matrix allows for rapid obtainment of replicate parameter estimates, without error due to exhaustive calculations.
- Subjects
CONGENITAL heart disease; CARDIAC catheterization; OXYGEN consumption; HEMODYNAMICS; CARDIAC volume; PATIENTS
- Publication
Annals of Thoracic Medicine, 2009, Vol 4, Issue 3, p124
- ISSN
1817-1737
- Publication type
Article
- DOI
10.4103/1817-1737.53348