Cardiac output estimation using Modelflow 2.1 via Portapres was not accurate compared to the CO2 rebreathing method during moderate exercise (mean difference 2.27 ± 3.91 min-1).
Cross-Sectional (n=12)
Is the Modelflow 2.1 arterial pulse contour method accurate for estimating cardiac output compared to the CO2 rebreathing method during moderate exercise?
The Modelflow 2.1 method using Portapres is not accurate for estimating cardiac output during moderate exercise compared to CO2 rebreathing.
Mean Difference: 2.27
The arterial pulse contour method called Modelflow 2.1 calculates stroke volume continuously, beat to beat, from the non-invasive blood pressure signal measured by Finapres or Portapres. Portapres is the portable version of Finapres. The purpose of this study was to compare cardiac output (CO) calculated using Modelflow 2.1 (COmf) with CO obtained by the CO2 rebreathing method (COre) during steady state at moderate exercise levels. Twelve subjects visited the laboratory twice and performed submaximal exercise on a bicycle ergometer at 20%, 40% and 60% of their individual peak power output (POpeak). The averaged correlation between COmf and COre gives an r-value of 0.69, whereas the slope and intercept of the regression line were 1.06 and 1.65 respectively. The averaged difference between COmf and COre was 2.27 +/- 3.91 min-1 (mean +/- standard deviation). However, the test-retest difference between COmf and COre was 2.5 +/- 3.1 and 0.5 +/- 1.31 min-1 respectively. These results suggest that Modelflow 2.1 is not an accurate method for estimating CO from non-invasive blood pressure data collected by Portapres during exercise at up to 60% of the individual POpeak corresponding with daily life activity.
Houtman et al. (Tue,) reported a cross-sectional. Modelflow 2.1 (pulse contour method via Portapres) vs. CO2 rebreathing method was evaluated on Cardiac output (CO) during steady state at moderate exercise levels (Mean difference 2.27 ± 3.91 min-1). Cardiac output estimation using Modelflow 2.1 via Portapres was not accurate compared to the CO2 rebreathing method during moderate exercise (mean difference 2.27 ± 3.91 min-1).