A Meta‐analysis of Published Studies Concerning the Validity of Thoracic Impedance Cardiography

Abstract

TIC might be useful for trend analysis of different groups of patients. However, since the reference method was of significant influence, differences between TIC and the reference method are incorrectly attributed to TIC alone.

Neural Control of the Circulation: How Sex and Age Differences Interact in Humans

“…These are well validated but usually require specialized equipment such as a customized mass spectrometer to measure breath-by-breath gas uptake, and may not be feasible for all laboratories. Simpler, non-invasive ways to estimate cardiac output include the arterial waveform analysis and transthoracic impedance (9, 61, 82, 113). These need to be used with care and are frequently best applied to evaluate changes within a subject during acute interventions rather than absolute values.…”

Temporal stability of twenty-four-hour ambulatory hemodynamic bioimpedance measures in African American adolescents

“…Several studies have shown IC to be a more reliable and effective method of monitoring systolic time intervals than arteriography [6]. Meta-analysis of published literature on the validity of IC-derived measures showed a pooled correlation coefficient of 0.84 for repeated measurement for CO for healthy people [9]. Correlations for 1-week temporal stability during subtraction, handgrip and drawing task sessions in children ranged from 0.81 to 0.86 for heart rate (HR), from 0.88 to 0.93 for PEP, from 0.77 to 0.85 for LVET, from 0.79 to 0.89 for Heather Index (HI), from 0.82 to 0.86 for stroke volume (SV), from 0.77 to 0.81 for CO, from 0.60 to 0.75 for systolic blood pressure (SBP), from 0.13 to 0.61 for diastolic blood pressure (DBP), from 0.28 to 0.67 for mean arterial pressure (MAP) and from 0.69 to 0.78 for total peripheral resistance (TPR) [3].…”

Noninvasive and Simple Assessment of Cardiac Output and Pulmonary Vascular Resistance With Whole-Body Impedance Cardiography Is Useful for Monitoring Patients With Pulmonary Hypertension

“…Thoracic impedance cardiography has been used for the measurement of CO noninvasively in PAH, 18 and its reliability was shown to be compromised in cardiac patients in a meta-analysis. 19 We demonstrated strong correlations among the NICaS, TD, and the Fick methods for the measurement of CO. Although the limits of agreement between NI-CO and TD-CO or Fick-CO estimated by the Bland-Altman approach were not small, they were acceptable when compared with previous reports.…”