Accuracy of impedance cardiography for evaluating trends in cardiac output.
نویسندگان
چکیده
BACKGROUND Impedance cardiography (ICG) enables continuous, beat-by-beat, non-invasive, operator-independent, and inexpensive cardiac output (CO) monitoring. We compared CO values and variations obtained by ICG (Niccomo™, Medis) and oesophageal Doppler monitoring (ODM) (CardioQ™, Deltex Medical) in surgical patients. METHODS This prospective, observational, single-centre study included 32 subjects undergoing surgery with general anaesthesia. CO was measured simultaneously with ICG and ODM before and after events likely to modify CO (vasopressor administration and volume expansion). One hundred and twenty pairs of CO measurements and 94 pairs of CO variation measurements were recorded. RESULTS The CO variations measured by ICG correlated with those measured by ODM [r=0.88 (0.82-0.94), P<0.001]. Trending ability was good for a four-quadrant plot analysis with exclusion of the central zone (<10%) [95% confidence interval (CI) for concordance (0.86; 1.00)]. Moderate to good trending ability was observed with a polar plot analysis (angular bias: -7.2°; 95% CI -12.3°; -2.5°; with radial limits of agreement -38°; 24°). After excluding subjects with chronic obstructive pulmonary disease, a Bland-Altman plot showed a mean bias of 0.47 litre min(-1), limits of agreements between -1.24 and 2.11 litre min(-1), and a percentage error of 35%. CONCLUSION ICG appears to be a reliable method for the non-invasive monitoring of CO in patients undergoing general surgery.
منابع مشابه
Cardiac output measured by transthoracic impedance cardiography at rest, during exercise and at various lung volumes.
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Abstract Background: Impedance cardiography (ICG) is a simple and inexpensive technique for non-invasive and continues measurement of stroke volume. Due to non-invasive nature, ICG is becoming increasingly used in research and clinical applications. With regard to lack of domestic impedance cardiograph and limited similar imported products in the country, an inexpensive and portable protot...
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ورودعنوان ژورنال:
- British journal of anaesthesia
دوره 113 4 شماره
صفحات -
تاریخ انتشار 2014