Abstract
ABSTRACT
Background
Echocardiography is widely used for non‐invasive measurements of stroke volume and cardiac output, while Ultrasonic Cardiac Output Monitor (USCOM) offers an alternative Doppler‐based approach. Whether these two modalities can be used interchangeably in clinical practice remains unclear. This study aims to evaluate the correlation and agreement between echocardiography and USCOM for hemodynamic assessment.
Methods
A total of 44 pediatric patients underwent hemodynamic assessment using echocardiography and sequential USCOM measurement during the same evaluation. Spearman's rank correlation was used to assess the relationship between methods. Agreement was evaluated using Bland‐Altman analysis.
Results
Strong correlations were found for stroke volume (SV;
r
= 0.97), cardiac output (CO;
r
= 0.95), cardiac index (CI;
r
= 0.91), stroke volume index (SVI;
r
= 0.90), and aortic valve (AV) diameter (
r
= 0.91;
p
r
= 0.64,
p
p
≤ 0.006), indicating that two methods increased disagreement with higher measured values. AV diameter and LVOT velocity showed no significant proportional bias and narrower limits of agreement.
Conclusions
Although echocardiography and USCOM correlate strongly for hemodynamic parameters, clinically meaningful systematic bias and proportional error limit their interchangeability for volumetric flow measurements. These devices should not be used interchangeably for quantitative hemodynamic monitoring, particularly in high‐output states.