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Changes in thoracic electrical bioimpedance during the cardiac cycle are utilised by the BoMed NCCOM3 monitor to measure cardiac output (CO_TEB). The technique provides a continuous noninvasive measurement but it has not been widely accepted. To determine the accuracy of the monitor, we compared its measurement with cardiac output measured by dye dilution (CO_dd) during induced hypotension and recovery in 23 dogs. After calibration of the NCCOM3 monitor during a resting state in each dog [mean blood pressure 112 ± 17 (SD), mean CO_DD 3.22 ± 0.99 l/min], the mean difference (CO_TEB-CO_DD) between paired measurements at the nadir of hypotension (bloodpressure 55 ± 24 mmHg) was 0.29 ± 0.47 l/min whose limits of agreement (mean difference ± 2 SD) were + 111.8% and -59.1% of the mean hypotensive CO_dd (110 ± 0.66 l/min). Upon recovery from hypotension (mean blood pressue 102 ± …