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  • Title: Assessment of the clinical utility of an ultrasonic monitor of cardiac output (the USCOM) and agreement with thermodilution measurement.
    Author: Boyle M, Steel L, Flynn GM, Murgo M, Nicholson L, O'Brien M, Bihari D.
    Journal: Crit Care Resusc; 2009 Sep; 11(3):198-203. PubMed ID: 19737122.
    Abstract:
    OBJECTIVE: To assess the clinical utility of an ultrasonic monitor of cardiac output (USCOM), its reliability in tracking cardiac output (CO) changes and agreement with thermodilution (TD) measurements of CO. DESIGN: Prospective comparison study. SETTING AND PARTICIPANTS: 55 adults undergoing thermodilution (TD) CO monitoring in a cardiothoracic or general intensive care unit between December 2006 and December 2007. MAIN OUTCOME MEASURES: USCOM and TD measurements of CO on two occasions in each patient were compared by Bland-Altman analysis for bias and limit of agreement. A mean percentage error <30% was considered acceptable. Per cent change in cardiac index (CI) was determined by each method. Doppler profiles obtained by the USCOM were assessed against an ideal standard ("acceptable"). RESULTS: 55 patients had measurements on 110 occasions, but Doppler waveforms were not obtained on 18 of these (16%), leaving 39 patients with paired comparisons for analysis (including 27 men; mean age, 64.7 [SD, 14.5] years). Mean TD CI was 3.4 +/-1.0L/min/m(2) (range, 2.0-6.0L/min/m(2)). The bias was 0.6L/min/m(2) (95% confidence limits [CLs], 0.4-0.8 L/min/m(2)), and the mean percentage error was 56% (95% CLs, 45%-65%). Twenty-two Doppler profiles (28%) were classed as acceptable; the mean percentage error for these was 62% (95% CLs, 38%-65%). On 15/19 occasions (74%) where TD CI changed > 15%, USCOM CI also changed >15%, but three of these changes (16%) were in the opposite direction. USCOM CI changed >15% on 9/20 occasions (45%) when TD CI did not. CONCLUSIONS: Poor agreement with TD and a substantial rate of failure to obtain an USCOM measurement suggest that this device is unsuitable as a monitoring tool in intensive care.
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