Comparison of Minimally Invasive Multi-Beat Analysis Method for Cardiac Output Monitoring Versus 2-D Echo Method.

Abstract

Background & Objectives: Hemodynamic monitoring is part of routine ICU care. The last decade has seen the increase in minimally invasive technology in this regard. We aimed to compare cardiac output (C.O) and stroke volume (S.V). obtained by 2d Echocardiography (2d Echo) with minimally invasive multi-beat analysis (MBAtm)technology using the arterial waveform
Methods: 360 patients were screened over 3 months for this observational study. Based on predefined criteria 15 patients were included. Data for cardiac output was collected by tans-thoracic 2d echo, done by a trained cardiologist. The Argos monitor (Retia Medical Systems Inc., White Plains, NY, USA) was used to simultaneously measure Cardiac output and stroke volume by MBAtm. The collected data was then compared.
Results: The data collected for cardiac output and stroke volume by both methods, 2 D echo and MBA, had a p value of 0.0005, which was indicative of a highly significant relationship. The values for intraclass correlation coefficient for stroke volume was 0.967 and for cardiac output by both methods was 0.971 thus showing excellent reliability. Bland-Altman also showed a strong level of agreement. Interpretation & Conclusions: Across 15 patients with wide-ranging diagnoses, the Argos monitor. showed excellent agreement with 2-D echo measurements. Multibeat analysis appears to be a promising minimally invasive method of cardiac output monitoring requiring less clinical skills, with an easy learning curve and satisfactory accuracy as per the results of this pilot study